Temat: Evapotranspiration - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Does melatonin improve the yield attributes of field-droughted banana under Egyptian semi-arid conditions?
Autorzy:: Hassan, Islam F.
Gaballah, Maybelle S.
Ogbaga, Chukwuma C.
Murad, Soha A.
Brysiewicz, Adam
Bakr, Basem M.M.
Mira, Amany
Alam-Eldein, Shamel M.
Powiązania:: https://bibliotekanauki.pl/articles/2073748.pdf
Data publikacji:: 2022
Wydawca:: Instytut Technologiczno-Przyrodniczy
Tematy:: banana
deficit irrigation
evapotranspiration
melatonin
photosynthesis
Opis:: Drought is regarded as one of the environmental constraints threatening agriculture worldwide. Melatonin is a pleiotropic molecule prevalent in plants capable of promoting plant endogenous resilience to many environmental challenges including drought. Banana is an important staple food consumed in developing countries especially in Africa. In this research, we studied the role of melatonin in the growth of bananas subjected to drought under the Egyptian semi-arid conditions. To achieve this objective, a field experiment on banana (Musa spp., cv. Williams) mother plants and first ratoon was conducted on a private farm for two seasons - 2019 and 2020. Three irrigation treatments, 100, 90 and 80% irrigation water requirements (IWR) were used in conjunction with four concentrations of melatonin as a foliar spray (0 μmol, 40 μmol, 60 μmol, and 80 μmol) to determine the effect of both treatments on banana plant performance under drought. The results showed that there was a substantial difference between treatments, with the foliar application of melatonin at 80 μmol concentration improving most of the yield attributes, relative water content, total chlorophyll and proline with water deficit. However, the foliar application of the molecule lowered the biochemical characteristics mostly at 80% IWR under the Egyptian semi-arid conditions. Overall, there was a concentration-dependent response with regards to IWR for the two seasons 2019 and 2020.
Źródło:: Journal of Water and Land Development; 2022, 52; 221--231
1429-7426
2083-4535
Pojawia się w:: Journal of Water and Land Development
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Results of water balance measurements in a sandy and silty-loam soil profile using lysimeters
Autorzy:: Tall, Andrej
Pavelková, Dana
Powiązania:: https://bibliotekanauki.pl/articles/292535.pdf
Data publikacji:: 2020
Wydawca:: Instytut Technologiczno-Przyrodniczy
Tematy:: evapotranspiration
lysimeter study
precipitation
water balance
Opis:: Lysimeters represent the ideal tool for direct measurement of soil water balance components in soil profiles. Changes in the water content in a soil monolith can be measured with sufficient accuracy by the precise lysimeter weighing system. Water content changes in soil monolith as derived from lysimeter mass represent one of the basic water balance component. This paper deals with the development and comparison of individual soil water balance components in two different soil profiles from the Easter-Slovakian-Lowland. Two lysimeter vessels were filled monolithically with two different soil profiles covered with grass: one sandy soil profile from locality Poľany and one silty-loam soil profile from locality Vysoká nad Uhom. A constant groundwater level of 1 m below ground level was maintained in both soil profiles. Under the same meteorological conditions, all differences in the development of water balance components were caused only by the differences in soil profiles. The actual evapotranspiration and water flows at the bottom of the soil profiles were compared. Sandy soils are generally considered to be more prone to drought than silty-loam soils. Under the specific conditions of this experiment (maintaining a constant groundwater level) the opposite was shown, when the silty-loam soil profile was more prone to drought than sandy soil profile. Sandy soil profile from Poľany reacted more quickly to precipitation (or evaporation). Due to the higher hydraulic conductivity of the sandy soil compared to the silty-loamy soil, the groundwater level response to external stimuli was much faster.
Źródło:: Journal of Water and Land Development; 2020, 45; 179-184
1429-7426
2083-4535
Pojawia się w:: Journal of Water and Land Development
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Evaluating four remote sensing based models to estimate latent heat flux in semi-arid climate for heterogeneous surface coverage of western Algeria
Autorzy:: Oualid, Tewfik A.
Hamimed, Abderahmane
Khaldi, Abdelkader
Powiązania:: https://bibliotekanauki.pl/articles/2174320.pdf
Data publikacji:: 2022
Wydawca:: Instytut Technologiczno-Przyrodniczy
Tematy:: Algeria
energy balance
evapotranspiration
Landsat
METRIC
SPARSE
TIM
TSEB
Opis:: Optimal estimation of water balance components at the local and regional scales is essential for many applications such as integrated water resources management, hydrogeological modelling and irrigation scheduling. Evapotranspiration is a very important component of the hydrological cycle at the soil surface, particularly in arid and semi-arid lands. Mapping evapotranspiration at high resolution with internalised calibration (METRIC), trapezoid interpolation model (TIM), two-source energy balance (TSEB), and soil-plant-atmosphere and remote sensing evapotranspiration (SPARSE) models were applied using Landsat 8 images for four dates during 2014-2015 and meteorological data. Surface energy maps were then generated. Latent heat flux estimated by four models was then compared and evaluated with those measured by applying the method of Bowen ratio for the various days. In warm periods with high water stress differences and with important surface temperature differences, METRIC proves to be the most robust with the root-mean-square error (RMSE) less than 40 W∙m-2. However, during the periods with no significant surface temperature and soil humidity differences, SPARSE model is superior with the RMSE of 35 W∙m-2. The results of TIM are close to METRIC, since both models are sensitive to the difference in surface temperature. However, SPARSE remains reliable with the RMSE of 55 W∙m-2 unlike TSEB, which has a large deviation from the other models. On the other hand, during the days when the temperature difference is small, SPARSE and TSEB are superior, with a clear advantage of SPARSE serial version, where temperature differences are less important.
Źródło:: Journal of Water and Land Development; 2022, 55; 259--275
1429-7426
2083-4535
Pojawia się w:: Journal of Water and Land Development
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Machine learning for supporting irrigation decisions based on climatic water balance
Autorzy:: Treder, Waldemar
Klamkowski, Krzysztof
Wójcik, Katarzyna
Tryngiel-Gać, Anna
Powiązania:: https://bibliotekanauki.pl/articles/27312625.pdf
Data publikacji:: 2023
Wydawca:: Instytut Technologiczno-Przyrodniczy
Tematy:: apple tree
evapotranspiration
irrigation scheduling
machine learning
precipitation
WEKA software
Opis:: A machine learning model was developed to support irrigation decisions. The field research was conducted on ‘Gala’ apple trees. For each week during the growing seasons (2009-2013), the following parameters were determined: precipitation, evapotranspiration (Penman-Monteith formula), crop (apple) evapotranspiration, climatic water balance, crop (apple) water balance (AWB), cumulative climatic water balance (determined weekly, ∑CWB), cumulative apple water balance (∑AWB), week number from full bloom, and nominal classification variable: irrigation, no irrigation. Statistical analyses were performed with the use of the WEKA 3.9 application software. The attribute evaluator was performed using Correlation Attribute Eval with the Ranker Search Method. Due to its highest accuracy, the final analyses were performed using the WEKA classifier package with the J48graft algorithm. For each of the analysed growing seasons, different correlations were found between the water balance determined for apple trees and the actual water balance of the soil layer (10-30 cm). The model made correct decisions in 76.7% of the instances when watering was needed and in 87.7% of the instances when watering was not needed. The root of the classification tree was the AWB determined for individual weeks of the growing season. The high places in the tree hierarchy were occupied by the nodes defining the elapsed time of the growing season, the values of ∑CWB and ∑AWB.
Źródło:: Journal of Water and Land Development; 2023, 58; 25--30
1429-7426
2083-4535
Pojawia się w:: Journal of Water and Land Development
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Satellite ET-based irrigation performance : Strategies to increase rainfed crops production in the lower Baro watershed, Ethiopia
Autorzy:: Befikadu Deneke, Fiseha
Shetty, Amba
Fufa, Fekadu
Powiązania:: https://bibliotekanauki.pl/articles/27312629.pdf
Data publikacji:: 2023
Wydawca:: Instytut Technologiczno-Przyrodniczy
Tematy:: crop water productivity
evapotranspiration
irrigation performance
lower Baro
yield gap
Opis:: Satellite-based irrigation performance is a valuable tool for improving yields in irrigated areas across the world and requires adequate land for long-term development. This study aimed to increase irrigation performance and yield gap variation of rainfed crops using the database of FAO’s Water Productivity Open Access Portal (WaPOR) and the Global Yield Gap Atlas. The evapotranspiration (ET) performance of irrigation is expressed in equity (CV of ET), reliability, adequacy (CV of ET), and water productivity (kg∙m-3). The rainfed crops are interpreted in terms of metric tonnes/ha. Specifically, 20,325 km2 of suitable pastoral land across eight sub-classes was converted to rainfed rice, sugarcane, maize, and vegetable crops. Results showed that the R2 value was 0.97 at Baro Itang and -0.99 at Sor Metu, with the Baro Gambella sub-catchment having the largest yield gap of 4.435.2, 8.870.4, and 10.080∙106 kg when the yield increased by 1/3, 2/3, and 3/4. On the other hand, Gumero Gore had the smallest yield gap of 10,690, 29,700, and 33,750 kg, respectively. The management regime was 2.87, 0.87, and 0.35 kg∙m-3 for growers in the estate, farmer association, and individual, respectively. The study concludes that no single irrigation technique can be considered the best, and a thorough analysis of spatiotemporal variation of the irrigation performance indicators and the yield gap in the water-scarce lower Baro watershed is required.
Źródło:: Journal of Water and Land Development; 2023, 58; 53--61
1429-7426
2083-4535
Pojawia się w:: Journal of Water and Land Development
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Evapotranspiration, vapour pressure and climatic water deficit in Ethiopia mapped using GMT and TerraClimate dataset
Autorzy:: Lemenkova, Polina
Powiązania:: https://bibliotekanauki.pl/articles/2174358.pdf
Data publikacji:: 2022
Wydawca:: Instytut Technologiczno-Przyrodniczy
Tematy:: cartography
climatic water deficit
environmental management
Ethiopia
evapotranspiration mapping
vapour pressure
Opis:: In the present research, a scripting cartographic technique for the environmental mapping of Ethiopia using climate and topographic datasets is developed. The strength of the Generic Mapping Tools (GMT) is employed for the effective visualisation of the seven maps using high-resolution data: GEBCO, TerraClimate, WorldClim, CRUTS 4.0 in 2018 by considering the solutions of map design. The role of topographic characteristics for climate variables (evapotranspiration, downward surface shortwave radiation, vapour pressure, vapour pressure deficit and climatic water deficit) is explained. Topographic variability of Ethiopia is illustrated for geographically dispersed and contrasting environmental setting in its various regions: Afar, Danakil Depression, Ethiopian Highlands, Great Rift Valley, lowlands and Ogaden Desert. The relationships between the environmental and topographic variables are investigated with aid of literature review and the outcomes are discussed. The maps are demonstrated graphically to highlight variables enabling to find correlations between the geographic phenomena, their distribution and intensity. The presented maps honor the environmental and topographic data sets within the resolution of the data. Integration of these results in the interpretation maps presented here brings new insights into both the variations of selected climate variables, and the topography of Ethiopia.
Źródło:: Journal of Water and Land Development; 2022, 54; 201--209
1429-7426
2083-4535
Pojawia się w:: Journal of Water and Land Development
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Time series analysis of reference crop evapotranspiration for Bokaro District, Jharkhand, India
Analiza serii czasowych ewapotranspiracji potencjalnej upraw w dystrykcie Bokaro, Jharkhand, Indie
Autorzy:: Gautam, R.
Sinha, A. K.
Powiązania:: https://bibliotekanauki.pl/articles/293179.pdf
Data publikacji:: 2016
Wydawca:: Instytut Technologiczno-Przyrodniczy
Tematy:: ARIMA model
evapotranspiration
forecasting
time series
ewapotranspiracja
model ARIMA
prognozowanie
serie czasowe
Opis:: Evapotranspiration is the one of the major role playing element in water cycle. More accurate measurement and forecasting of Evapotranspiration would enable more efficient water resources management. This study, is therefore, particularly focused on evapotranspiration modelling and forecasting, since forecasting would provide better information for optimal water resources management. There are numerous techniques of evapotranspiration forecasting that include autoregressive (AR) and moving average (MA), autoregressive moving average (ARMA), autoregressive integrated moving average (ARIMA), Thomas Feiring, etc. Out of these models ARIMA model has been found to be more suitable for analysis and forecasting of hydrological events. Therefore, in this study ARIMA models have been used for forecasting of mean monthly reference crop evapotranspiration by stochastic analysis. The data series of 102 years i.e. 1224 months of Bokaro District were used for analysis and forecasting. Different order of ARIMA model was selected on the basis of autocorrelation function (ACF) and partial autocorrelation (PACF) of data series. Maximum likelihood method was used for determining the parameters of the models. To see the statistical parameter of model, best fitted model is ARIMA (0, 1, 4) (0, 1, 1)₁₂.
Ewapotranspiracja jest jednym z głównych elementów obiegu wody. Dokładniejsze pomiary i możliwość prognozowania ewapotranspiracji mogłyby umożliwić wydajniejsze zarządzanie zasobami wodnymi. Dlatego prezentowane w niniejszej pracy badania skoncentrowane były na modelowaniu i prognozowaniu ewapotranspiracji, ponieważ prognozowanie zapewni więcej informacji do optymalnego zarządzania zasobami wodnymi. Istnieje wiele technik prognozowania ewapotranspiracji, takich jak autoregresja (AR), średnia ruchoma (MA), autoregresyjna średnia ruchoma (ARMA), autoregresyjna zintegrowana średnia ruchoma (ARIMA), metoda Thomasa– Feiringa i inne. Stwierdzono, że spośród nich ARIMA jest bardziej odpowiednia do analizy i prognozowania zdarzeń hydrologicznych. Z tego powodu wykorzystano model ARIMA do prognozowania miesięcznych średnich wartości ewapotranspiracji potencjalnej poprzez analizę stochastyczną. Do analiz i prognozowania użyto serii danych ze 102 lat (1224 miesiące) z dystryktu Bokaro. Na podstawie funkcji autokorelacji (ACF) i cząstkowych autokorelacji (PACF) serii danych wybrano różny porządek modelu ARIMA. Do wyznaczenia parametrów modelu wykorzystano metodę maksymalnego prawdopodobieństwa. Najlepiej dostosowanymi parametrami statystycznymi modelu okazały się ARIMA (0, 1, 4) (0, 1, 1)₁₂.
Źródło:: Journal of Water and Land Development; 2016, 30; 51-56
1429-7426
2083-4535
Pojawia się w:: Journal of Water and Land Development
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Performance evaluation of solar radiation equations for estimating reference evapotranspiration (ETo) in a humid tropical environment
Ocena wyników równań promieniowania słonecznego do oszacowania ewapotranspiracji potencjalnej (ETo) w wilgotnym środowisku tropikalnym
Autorzy:: Ndulue, Emeka
Onyekwelu, Ikenna
Ogbu, Kingsley Nnaemeka
Ogwo, Vintus
Powiązania:: https://bibliotekanauki.pl/articles/292778.pdf
Data publikacji:: 2019
Wydawca:: Instytut Technologiczno-Przyrodniczy
Tematy:: calibration
models
reference evapotranspiration
solar radiation
validation
ewapotranspiracja potencjalna
kalibracja
ocena
promieniowanie słoneczne
Opis:: Solar radiation (Rs) is an essential input for estimating reference crop evapotranspiration, ETo. An accurate estimate of ETo is the first step involved in determining water demand of field crops. The objective of this study was to assess the accuracy of fifteen empirical solar radiations (Rs) models and determine its effects on ETo estimates for three sites in humid tropical environment (Abakaliki, Nsukka, and Awka). Meteorological data from the archives of NASA (from 1983 to 2005) was used to derive empirical constants (calibration) for the different models at each location while data from 2006 to 2015 was used for validation. The results showed an overall improvement when comparing measured Rs with Rs determined using original constants and Rs using the new constants. After calibration, the Swartman–Ogunlade (R² = 0.97) and Chen 2 models (RMSE = 0.665 MJ∙m^–2∙day^–1) performed best while Chen 1 (R² = 0.66) and Bristow–Campbell models (RMSE = 1.58 MJ∙m^–2∙day^–1) performed least in estimating Rs in Abakaliki. At the Nsukka station, Swartman–Ogunlade (R² = 0.96) and Adeala models (RMSE = 0.785 MJ∙m^–2∙day^–1) performed best while Hargreaves–Samani (R² = 0.64) and Chen 1 models (RMSE = 1.96 MJ∙m^–2∙day^–1) performed least in estimating Rs. Chen 2 (R² = 0.98) and Swartman–Ogunlade models (RMSE = 0.43 MJ∙m^–2∙day^–1) performed best while Hargreaves–Samani (R² = 0.68) and Chen 1 models (RMSE = 1.64 MJ∙m^–2∙day^–1) performed least in estimating Rs in Awka. For estimating ETo, Adeala (R² =0.98) and Swartman–Ogunlade models (RMSE = 0.064 MJ∙m^–2∙day^–12 = 0.98) and Chen 2 models (RMSE = 0.43 MJ∙m^–2∙day^–1) performed best at Abakaliki while Angstrom–Prescott–Page (R² = 0.96) and El-Sebaii models (RMSE = 0.0908 mm∙day^–1) performed best at the Nsukka station.
Promieniowanie słoneczne (Rs) stanowi istotny czynnik w trakcie określania ewapotranspiracji potencjalnej (ETo) terenów uprawnych. Dokładne oszacowanie ETo jest pierwszym etapem ustalania zapotrzebowania na wodę pól uprawnych. Celem tego badania była ocena dokładności piętnastu empirycznych modeli Rs i oznaczenie wpływu tego parametru na szacunki ewapotranspiracji w trzech stanowiskach wilgotnego środowiska tropikalnego (Abakaliki, Nsukka i Awka). Wykorzystano archiwalne dane meteorologiczne NASA z lat 1983 do 2003 do wyprowadzenia empirycznych stałych (kalibracja) dla różnych modeli w każdej z trzech lokalizacji, a dane z lat 2006 do 2015 posłużyło do oceny. Wyniki wskazują na większą zgodność mierzonego Rs i oszacowanych wartości promieniowania wyznaczonego z zastosowaniem nowych stałych. Po kalibracji modele Swartmana–Ogunladego (R² = 0,97) i Chena 2 (RMSE = 0,665 MJ∙m^–2∙d^–1) dawały najlepsze wyniki, podczas gdy modele Chena 1 (R² = 0,66) i Bristowa–Campbella (RMSE = 1,58 MJ∙m^–2∙d^–1) były najmniej dokładne w wyznaczaniu Rs w Akabaliki. W stacji Nsukka modele Swartmana–Ogunladego (R² = 0,96) i Adeali (RMSE = 0,785 MJ∙m^–2∙d^–1) dawały najlepiej dostosowane wyniki oszacowania Rs, natomiast modele Hargreavesa–Samaniego (R² = 0,64) i Chena 1 (RMSE = 1,96 MJ∙m^–2∙d^–1) najmniej. Modele Chena 2 (R² = 0,98) i Swartmana–Ogunladego (RMSE = 0,43 MJ∙m^–2∙d^–1) okazały się najlepsze, a modele Hargreavesa–Samaniego (R² = 0,68) i Chena 1 (RMSE = 1,64 MJ∙m^–2∙d^–1) – najgorsze w ustalaniu promieniowania w stanowisku Awka. W oszacowaniach ETo modele Adeali (R² = 0,98) i Swartmana– Ogunladego (RMSE = 0.064 MJ∙m^–2∙d^–1) dawały najlepsze wyniki w przypadku danych ze stanowiska Awka, a modele Swartmana–Ogunladego (R² = 0,98) i Chena 2 (RMSE = 0,43 MJ∙m^–2∙d^–1) okazały się najlepsze w przypadku danych ze stanowiska Abakaliki. W odniesieniu do stanowiska Nsukka najlepsze wyniki uzyskano, stosując modele Angstroma– Prescotta–Page’a (R² = 0,96) i El-Sebaii (RMSE = 0,0908 mm∙d^–1).
Źródło:: Journal of Water and Land Development; 2019, 42; 124-135
1429-7426
2083-4535
Pojawia się w:: Journal of Water and Land Development
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Water productivity under deficit irrigation using onion as indicator crop
Autorzy:: Tadesse, Kassahun B.
Hagos, Eyasu Y.
Tafesse, Nata T.
Dinka, Megersa O.
Powiązania:: https://bibliotekanauki.pl/articles/293258.pdf
Data publikacji:: 2020
Wydawca:: Instytut Technologiczno-Przyrodniczy
Tematy:: drip irrigation
effective rainfall
real evapotranspiration
soil water
water quality
water use efficiency
Opis:: Improving water productivity (WP) through deficit irrigation is crucial in water-scarce areas. To practice deficit irrigation, the optimum level of water deficit that maximizes WP must be investigated. In this study, a field experiment was conducted to examine WP of the three treatments at available soil water depletion percentage (P_i) of 25% (reference), 45% and 65% using a drip irrigation system. Treatments were arranged in a randomized complete block design. The water deficit was allowed throughout the growth stages after transplanting except for the first 15 days of equal amounts of irrigations during the initial growth stage and 20 days enough spring season rainfall during bulb enlargement periods. Physical WP in terms of water use efficiency (WUEf) for treatments T1, T2, and T3 was 9.44 kg∙m^–3, 11 kg∙m^–3 and 10.6 kg∙m^–3 for marketable yields. The WUEf and economic water productivity were significantly improved by T2 and T3. The WUEf difference between T2 and T3 was insignificant. However, T2 can be selected as an optimal irrigation level. Hence, deficit irrigation scheduling is an important approach for maximizing WP in areas where water is the main constraint for crop production. The planting dates should be scheduled such that the peak water requirement periods coincide with the rainy system.
Źródło:: Journal of Water and Land Development; 2020, 45; 171-178
1429-7426
2083-4535
Pojawia się w:: Journal of Water and Land Development
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: An assessment of the water requirements of a mountain pasture sward in the Polish Western Carpathians
Ocena potrzeb wodnych runi pastwiskowej w Polskich Zachodnich Karpatach
Autorzy:: Kuźniar, A.
Twardy, S.
Kowalczyk, A.
Kostuch, M.
Powiązania:: https://bibliotekanauki.pl/articles/293291.pdf
Data publikacji:: 2011
Wydawca:: Instytut Technologiczno-Przyrodniczy
Tematy:: ewapotranspiracja wskaźnikowa
klimatyczny bilans wodny
pastwiska
pasture sward
crop evapotranspiration
water requirements
Carpathian Mountains
Opis:: The water requirements of the pasture sward using the Penman-Monteith method (FAO-56), which is seldom applied in Poland, was assessed. The reference crop evapotranspiration ET_o from a hypothetical grass crop with an assumed crop height of 0.12 m, a fixed surface resistance of 70 s·m^-1 and an albedo of 0.23, was used. These assumptions are similar under conditions of ruminant grazing. ET_o was computed by using meteorological data from 43 weather stations. The crop evapotranspiration ET_c is the product of ET_o, and single crop coefficient K_c. The differences between precipitation and ET_o and ET_c (climatic water balances) were determined for mountain pastures. The results were summarised form of a table and maps of isohyets and isolines elaborated by applying the Geographic Information System techniques (Arc View 9) with the data interpolated by the geostatic method (Kriging).
Celem pracy było określenie ewapotranspiracji wskaźnikowej, potrzeb wodnych oraz klimatycznego bilansu wodnych pastwisk górskich w polskich Karpatach z zastosowaniem metody Penmana-Monteitha FAO-56 (ALLEN et al., 1998) . Osiągnięcie założonego celu zostało dokonane przez: a) oszacowanie wartości ewapotranspiracji wskaźnikowej ET_o oraz opracowanie rozkładu przestrzennego ewapotranspiracji wskaźnikowego ET_o i elementów klimatycznego bilansu wodnego (P - ET_o); b) charakteryzowanie ewapotranspiracji wskaźnikowej oraz klimatycznego bilansu pastwisk górskich w Polskich Karpatach. Poddano analizie dane meteorologiczne z 43 posterunków obserwacyjnych, pochodzących ze zbiorów Instytutu Meteorologii i Gospodarki Wodnej, a także ze Stacji Badawczej ITP w Jaworkach. Dane pochodziły z lat 1990-2005 i reprezentują zmienne warunki klimatyczne w polskich Karpatach. Wyniki badań przedstawiono w postaci map rozkładu przestrzennego, które wykonano metodą GIS ArcView. Przedstawiono następujące elementy: izolinie średnich: sum półroczy letnich (V-X), opadów atmosferycznych P, ewapotranspiracji wskaźnikowej ET_o, oraz klimatycznego bilansu wodnego (P - ET_o). W okresie półrocza letniego najmniejszymi wartościami ewapotranspiracji wskaźnikowej odznaczają się północne stoki Tatr (Zakopane - 433 mm). Region Beskidu Zachodniego charakteryzuje się mniejszymi średnimi sumami ewapotranspiracji wskaźnikowej, wynoszącymi w okresie letnim od około 440 mm w Beskidzie Śląskim do 460 mm w Beskidzie Sądeckim. W Bieszczadach ET_o w omawianym okresie letnim mieści się w zakresie od 460 do 480 mm. Półrocze letnie charakteryzuje się dużym zróżnicowaniem przestrzennym średnich sum klimatycznego bilansu wodnego (P - ET_o). Najwyższe nadmiary opadów (P - ET_o) występują w partiach szczytowych Beskidu Żywieckiego (400 mm) oraz Tatr Polskich - ponad 700 mm. Linia równowagi opadów atmosferycznych i ewapotranspiracji wskaźnikowej (P = ET_o) przebiega wzdłuż granicy między Karpatami a Kotlinami Podkarpackimi. W Beskidzie Wyspowym notowane są nadmiary opadów od 100 do 250 m. Kotliny śródgórskie charakteryzują się również znacznymi nadwyżkami opadów: Kotlina Żywiecka - 300 mm, Orawsko-Nowotarska - poniżej 200 mm, Sądecka - 150-200 mm i Doły Jasielsko-Sanockie - 0-100 mm. W Bieszczadach wskaźnik (P-ET_o) wynosi od 150 do 300 mm.
Źródło:: Journal of Water and Land Development; 2011, 15; 193-207
1429-7426
2083-4535
Pojawia się w:: Journal of Water and Land Development
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Impact of the projected climate change on soybean water needs in the Kuyavia region in Poland
Autorzy:: Kasperska-Wołowicz, Wiesława
Rolbiecki, Stanisław
Sadan, Hicran A.
Rolbiecki, Roman
Jagosz, Barbara
Stachowski, Piotr
Liberacki, Daniel
Bolewski, Tymoteusz
Prus, Piotr
Pal-Fam, Ferenc
Powiązania:: https://bibliotekanauki.pl/articles/2048516.pdf
Data publikacji:: 2021
Wydawca:: Instytut Technologiczno-Przyrodniczy
Tematy:: climate change scenario
crop water needs
evapotranspiration
Glycine max L. Merrill
irrigation
precipitation
protein crops
Opis:: According to the SRES A1B climate change scenario, by the end of the 21st century temperature in Poland will increase by 2–4°C, no increase in precipitation totals is predicted. This will rise crop irrigation needs and necessity to develop irrigation systems. Due to increase in temperature and needs of sustainable agriculture development some changes in crop growing structure will occur. An increase interest in high protein crops cultivation has been noted last years and further extension of these acreage is foreseen. Identifying the future water needs of these plants is crucial for planning and implementing sustainable agricultural production. In the study, the impact of projected air temperaturę changes on soybean water needs, one of the most valuable high-protein crops, in 2021-2050 in the Kuyavia region in Poland was analysed. The calculations based on meteorological data collected in 1981-2010 were considered as the reference period. Potential evapotranspiration was adopted as a measure of crop water requirements. The potential evapotranspiration was estimated using the Penman–Monteith method and crop coefficient. Based on these estimations, it was found that in the forecast years the soybean water needs will increase by 5% in the growing period (from 21 April to 10 September), and by 8% in June-August. The highest monthly soybean water needs increase (by 15%) may occur in August. The predicted climate changes and the increase in the arable crops water requirements, may contribute to an increase in the irrigated area in the Kuyavia region and necessity of rational management of water resources.
Źródło:: Journal of Water and Land Development; 2021, 51; 199-207
1429-7426
2083-4535
Pojawia się w:: Journal of Water and Land Development
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Climatic and anthropogenic drivers of zero-flow events in intermittent rivers in Poland
Autorzy:: Rutkowska, Agnieszka
Osuch, Marzena
Żelazny, Mirosław
Banasik, Kazimierz
Klimek, Mariusz
Powiązania:: https://bibliotekanauki.pl/articles/27312644.pdf
Data publikacji:: 2023
Wydawca:: Instytut Technologiczno-Przyrodniczy
Tematy:: circular statistics
climatic impact
anthropogenic impact
river flow intermittence
standardised evapotranspiration index
trend in flow intermittence
Opis:: River intermittence was studied based on data from hydrological monitoring in Poland. We screened the entire state database and two another data sources applying the criterion for zero-flow event: discharge less than 0.0005 m3∙s-1, and found five intermittent rivers with catchment area from 9.2 to 303.7 km2. We aimed at finding associations between intermittence and climatic driving forces (temperature and precipitation), and between intermittence and anthropogenic activity. We used the Spearman correlation coefficient, circular statistics, and statistical tests for trend. The concentration of zero-flow days, mostly in summer, and the decreasing trend in the standardised precipitation evapotranspiration index (SPEI) in all catchments at various aggregation levels, and an increasing trend in the total number of zero-flow days and in the maximum length of zero flow events in two rivers, were detected. The strong negative correlation (–0.62 ≤ ρ < 0) between intermittence and the SPEI backward lagged in time showed that intermittence resulted from prolonged deficits in climatic water balance due to increasing evapotranspiration. The reaction of the Noteć catchment, amplified by the anthropogenic pressure (brown coal mines), was reflected in the atypical shape of the rose diagram and in inhomogeneities in river discharges. The results show that the rose diagram can serve as an indicator of the degree of anthropogenic impact on runoff conditions.
Źródło:: Journal of Water and Land Development; 2023, 57; 52--61
1429-7426
2083-4535
Pojawia się w:: Journal of Water and Land Development
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Impact of extreme climate years on relative "yield - evapotranspiration" relationships
Wpływ ekstremalnych warunków klimatycznych na względną zależność "plon - ewapotranspiracja"
Autorzy:: Mladenova, B.
Varlev, I.
Powiązania:: https://bibliotekanauki.pl/articles/293375.pdf
Data publikacji:: 2007
Wydawca:: Instytut Technologiczno-Przyrodniczy
Tematy:: ewapotranspiracja
klimat
kukurydza
plon
współczynnik reakcji roślin na niedobory wody
climate
evapotranspiration
maize
yield
yield response factor
Opis:: The relative relationships "yield - evapotranspiration" were used long time ago. The well known linear relationship yi = 1 - ky (1 - ei), where yi is relative yield, ky - yield response factor and ei - relative evapotranspiration was proposed. It's usually assumed that ky is constant for a given crop and climatic conditions. It was found, however, that ky for late variety of maize H 708 varied through the study years (1984-1990) in the Plovdiv region ( South Bulgaria , altitude 150 m). During the dry years it was significantly higher than in the medium and humid years. The range of ky for maize in this location was 1.12-1.90, the average value being 1.50. The climate in the Sofia region (the experimental field of Chelopechene, altitude 550 m) is comparatively more humid. The two regions approximately outlined the boundaries of the appropriate economical conditions for grain maize production. The experiments in the Sofia region were carried out in the years 1994-2000. The seven years results for mean variety maize showed that the relationships "yield - evapotranspiration" and, respectively, ky varied at these climatic conditions too. The highest ky value was 1.41 for the driest year (2000) and the lowest value - 1.05 for the most wet years (1995, 1999). The value of ky for average years was 1.21. The yield response factor ky is of more significance when the relative evapotranspiration is less than 0.7-0.8. Thus, the extreme or the average values of ky could be used for the corresponding climatic regions. The relationships between ky and relative yield were established without considering irrigation.
W pracy przedstawiono wyniki badań nad plonami i ewapotranspiracją dwóch mieszańców kukurydzy. Badania te prowadzono w różnych okresach siedmioletnich w dwóch odmiennych klimatycznie regionach Bułgarii. Analizowane regiony wyznaczają granice obszarów opłacalnej uprawy kukurydzy na ziarno w tych warunkach klimatycznych. Przedstawiono analizę wartości wskaźnika ky w latach suchych, średnich i mokrych. Wykazano wyraźne zależności korelacyjne między plonami a ewapotranspiracją, potwierdzone bardzo wysokimi wartościami współczynników determinacji R2. Wartości ewapotranspiracji aktualnej ETa i potencjalnej ETm wyznaczono na podstawie zaleceń FAO. Badania udowodniły, że wartość ewapotranspiracji może ulec istotnej zmianie w wyniku ewentualnej zmiany klimatu. Już obecnie obserwuje się w Bułgarii wzrost temperatury i zmniejszenie opadów atmosferycznych, co może mieć duży wpływ na plonowanie roślin uprawnych.
Źródło:: Journal of Water and Land Development; 2007, 11; 71-77
1429-7426
2083-4535
Pojawia się w:: Journal of Water and Land Development
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Modelling causality between agricultural and meteorological drought indices in the Corong River basin, East Java Indonesia
Autorzy:: Affandy, Nur A.
Iranata, Data
Anwar, Nadjadji
Maulana, Mahendra A.
Prastyo, Dedy D.
Jaelani, Lalu M.
Suryadi, F. X.
Powiązania:: https://bibliotekanauki.pl/articles/28411634.pdf
Data publikacji:: 2023
Wydawca:: Instytut Technologiczno-Przyrodniczy
Tematy:: drought
river basin
standard normalisation difference vegetation index
NDVI
standardised precipitation evapotranspiration index
SPEI
time series regression
Opis:: The Lamongan Regency is an area in East Java, Indonesia, which often experiences drought, especially in the south. The Corong River basin is located in the southern part of Lamongan, which supplies the irrigation area of the Gondang Reservoir. Drought monitoring in the Corong River basin is very important to ensure the sustainability of the agricultural regions. This study aims to analyse the causal relationship between meteorological and agricultural drought indices represented by standardised precipitation evapotranspiration index (SPEI) and standard normalisation difference vegetation index (NDVI), using time series regression. The correlation between NDVI and SPEI lag 4 has the largest correlation test results between NDVI and SPEI lag, which is 0.41. This suggests that the previous four months of meteorological drought impacted the current agricultural drought. A time series regression model strengthens the results, which show a causal relationship between NDVI and SPEI lag. According to the NDVI-SPEI-1 lag 4 time series model, NDVI was influenced by NDVI in the previous 12 periods, and SPEI-1 in the last four periods had a determinant coefficient value of 0.4. This shows that the causal model between SPEI-1 and NDVI shows a fairly strong relationship for drought management in agricultural areas (irrigated areas) and is considered a reliable and effective tool in determining the severity and duration of drought in the study area.
Źródło:: Journal of Water and Land Development; 2023, 58; 178--188
1429-7426
2083-4535
Pojawia się w:: Journal of Water and Land Development
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: Weather drought index prediction using the support vector regression in the Ansegmir Watershed, Upper Moulouya, Morocco
Autorzy:: Bekri, My Hachem
El Hmaidi, Abdellah
Ousmana, Habiba
El Faleh, El Mati
Berrada, Mohamed
El Aissaoui, Kamal
Essahlaoui, Ali
El Ouali, Abdelhadi
Powiązania:: https://bibliotekanauki.pl/articles/1841959.pdf
Data publikacji:: 2021
Wydawca:: Instytut Technologiczno-Przyrodniczy
Tematy:: Ansgemir watershed
drought
forecast
modelling
standardized precipitation index
SPI
standardized precipitation-evapotranspiration index
SPEI
support vectors regression
SVR
Opis:: The purpose of this study is to develop mathematical models based on artificial intelligence: Models based on the support vectors regression (SVR) for drought forecast in the Ansegmir watershed (Upper Moulouya, Morocco). This study focuses on the prediction of the temporal aspect of the two drought indices (standardized precipitation index – SPI and standardized precipitation-evapotranspiration index – SPEI) using six hydro-climatic variables relating to the period 1979–2013. The model SVR3-SPI: RBF, ε = 0.004, C = 20 and γ = 1.7 for the index SPI, and the model SVR3-SPEI: RBF ε = 0.004, C = 40 and γ = 0.167 for the SPEI index are significantly better in comparison to other models SVR1, SVR2 and SVR4. The SVR model for the SPI index gave a correlation coefficient of R = 0.92, MSE = 0.17 and MAE = 0.329 for the learning phase and R = 0.90, MSE = 0.18 and MAE = 0.313 for the testing phase. As for the SPEI index, the overlay is slightly poorer only in the case of the SPI index between the observed values and the predicted ones by the SVR model. It shows a very small gap between the observed and predicted values. The correlation coefficients R = 0.88 for the learning, R = 0.86 for testing remain higher and corresponding to a quadratic error average MSE = 0.21 and MAE = 0.351 for the learning and MSE = 0.21 and MAE = 0.350 for the testing phase. The prediction of drought by SVR model remain useful and would be extremely important for drought risk management.
Źródło:: Journal of Water and Land Development; 2021, 50; 187-194
1429-7426
2083-4535
Pojawia się w:: Journal of Water and Land Development
Dostawca treści:: Biblioteka Nauki

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