Temat: index - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Comparative study of meteorological and hydrological drought characteristics in the Pekalen River basin, East Java, Indonesia
Autorzy:: Harisuseno, Donny
Powiązania:: https://bibliotekanauki.pl/articles/946923.pdf
Data publikacji:: 2020
Wydawca:: Instytut Technologiczno-Przyrodniczy
Tematy:: drought index
rainfall anomaly index
standardized precipitation index
standardized streamflow index
Opis:: Drought is known as a normal part of climate and including in a slow-onset natural hazard which may have several impacts on hydrology, agriculture, and socioeconomic. Drought monitoring, including its severity, spatial and duration is required and becomes an essential input for establishing drought risk management and mitigation plan. Many drought indices have been introduced and applied in regions with different climate characteristics in the last decades. This paper aims to compare standardized precipitation index (SPI) and rainfall anomaly index (RAI) along with standardized streamflow index (SSI) in Pekalen River Basin, East Java, Indonesia. The statistical association analyses, included the Pearson correlation (r), Kendal tau (τ), and Spearman rho (rs) were performed to examine the degree of consistency between monthly and annual drought index of SPI and RAI. Additionally, the comparative analysis was performed by overlapping both monthly and annual drought index from the SPI and RAI with the SSI at hydrological years. The study revealed that the characteristic of the annual drought index between the SPI and RAI exhibits pattern similarity which indicated by the high correlation coefficient between them. Further, the comparative analysis on each hydrological year showed that the SPI and RAI were very well correlated and exhibited a similar pattern with the SSI. Overall, the SPI shows better performance than the RAI for estimating drought characteristic either monthly or annual basis. Hence, the SPI is considered as a reliable and effective tool for analyzing drought characteristic in the study area.
Źródło:: Journal of Water and Land Development; 2020, 45; 29-41
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:: Phytocenological approach in biomonitoring of the state of aquatic ecosystems in Ukrainian Polesie
Autorzy:: Fedonyuk, Tetiana P.
Fedoniuk, Roman H.
Zymaroieva, Anastasiia A.
Pazych, Viktor M.
Aristarkhova, Ella O.
Powiązania:: https://bibliotekanauki.pl/articles/293038.pdf
Data publikacji:: 2020
Wydawca:: Instytut Technologiczno-Przyrodniczy
Tematy:: biodiversity
biomonitoring
macrophytes
Margalef index
Pielou index
Shannon index
Simpson index
surface water
water quality
Opis:: The results of a research into the scale and consequences of the degradation of aquatic ecosystems in Ukrainian Polesie have been detected in article, and the areas of increased anthropogenic pressure have been identified which greatly affect the condition and number of aquatic macrophytes. The biodiversity of sites with different anthropogenic load was evaluated using the biodiversity criteria. In the research, the structural and functional features of macrophytic species diversity within Teteriv River ecological corridor as a typical river landscape of Ukrainian Polesie were determined and described, the floristic composition was determined. Within the ecological zones, the number of species and their projective coverage in areas with different anthropogenic pressures within Teteriv River ecological corridor were determined. The basic criteria for the implementation of deferred biomonitoring based on the analysis of the dynamics of the species composition of the phytocoenoses of Teteriv River ecological corridor on the indicators of ecological stability and plasticity using the species-specific criteria, are: Margalef species richness index, Sørensen–Dice index, Shannon diversity index, Simpson’s index, and Pielou’s evenness index. Based on the results, correlation dependencies have been constructed, which will allow to obtain data on the stability of the development of aquatic ecosystems according to the data of species surveys. Interconnections between biodiversity indicators and indicators of surface water quality within the Ukrainian Polesie were found; they are the fundamental component of a long-term monitoring of the stability in the development of aquatic phytocenoses.
Źródło:: Journal of Water and Land Development; 2020, 44; 65-74
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:: The use of phytoplankton communities for assessment of water quality in the Wadaslintang Reservoir in Indonesia
Autorzy:: Piranti, Agatha S.
Wibowo, Dwi N.
Powiązania:: https://bibliotekanauki.pl/articles/946893.pdf
Data publikacji:: 2020
Wydawca:: Instytut Technologiczno-Przyrodniczy
Tematy:: algae
pollution level
Shannon-Wiener index
Storet index
water quality
Opis:: The use of phytoplankton as an indicator of water pollution is a promising tool for assessment of water quality. The purpose of this study was to determine whether diversity indices, including the species richness and diversity of phyto-plankton, could be used for reliable assessment of water quality in the Wadaslintang Reservoir in Indonesia. Surveys were conducted monthly at eight sites, from July 2019 to October 2019. Phytoplankton was collected during the day at 10:00 until approximately 15:00 in the euphotic zone. The parameters investigated were species richness and the abundance of phytoplankton, as well as water quality parameters listed in Government Regulation Number 82 of 2001. The level of pollution was represented biologically by the Shannon–Wiener diversity index and physicochemically by the STORET (storage and retrieval of water quality data) index. Moreover, the two indices were compared to determine whether a particular diversity index was more effective for assessment of this reservoir. The results showed that during the dry season, 22 taxa of phytoplankton were present, belonging to Cyanophyta, Chlorophyta, Chrysophyta, and Euglenophyta. During the wet season, 29 taxa were found, belonging to Cyanophyta, Chlorophyta, and Chrysophyta. Based on the Shannon-Wiener index and STORET index, water quality was better during the wet season than during the dry season. The results of water quality assessment using both indices were consistent, but the diversity index was a more sensitive indicator of pollution levels. Therefore, the Shannon–Wiener index is a useful tool for assessment of water quality in the Wadaslintang Reservoir.
Źródło:: Journal of Water and Land Development; 2020, 46; 170-178
1429-7426
2083-4535
Pojawia się w:: Journal of Water and Land Development
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Correlation between physical and chemical parameters of water and biotic indices: The case study the White Drin River basin, Kosovo
Autorzy:: Zhushi Etemi, Ferdije
Çadraku, Hazir
Bytyçi, Arbnore
Kuçi, Tetlinda
Desku, Arbnore
Ymeri, Prespa
Bytyçi, Pajtim
Powiązania:: https://bibliotekanauki.pl/articles/292304.pdf
Data publikacji:: 2020
Wydawca:: Instytut Technologiczno-Przyrodniczy
Tematy:: biotic index
diversity index
macroinvertebrate assemblage
pollution
the White Drin River basin
Opis:: The major impacts on aquatic ecosystems worldwide caused by land use lead to changes in their natural conditions and limitation of water use for various needs. This paper presents the results of the study of the physical and chemical parameters and macroinvertebrate assemblage in the White Drin River (or: the Drim River, Alb. the Drini i Bardhë River) basin, the largest in Kosovo. Macroinvertebrate sampled at 11 sites in the river resulted in 5946 collected benthic organisms, which in taxonomic terms belong to 12 orders and 51 families. Of the total number of organisms, 72.28% were Insects, 25.39% Amphipoda crustaceans and 2.33% were Annelide worms and Mollusk. The used biotic indices Biological Monitoring Working Party (BMWP), Ephemeroptera, Plecoptera, and Trichoptera (EPT), average score per taxon (ASPT) and Stroud Water Research Center (SWRC) classify water quality in excellent category in the sampling site S1 near the source of the White Drin River, whereas in other sampling sites, as a result of pollution, water quality varies on category II–IV. The Pearson's correlation analyses shown that the physical and chemical parameters affect the water quality and the composition of macroinvertebrates. Our results show that the parameters that adversely affect the BMWP, EPT and ASPT biotic indices as well as the Shannon–Wiener, Mergalef and Menhinik diversity indices are: pH, electrical conductivity (EC), total suspended solids (TSS), nitrates (NO₃^–) and chlorides (Cl^–). We can conclude that the anthropogenic impact on White Drin basin affects the physical, chemical and biological parameters of the water therefore these parameters should be constantly included in Biomonitoring and Management plans for water resources in Kosovo.
Źródło:: Journal of Water and Land Development; 2020, 46; 229-241
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:: Evaluation of groundwater in aluminium slag disposal area
Autorzy:: Putranto, Thomas Triadi
Febriane, Wenny
Powiązania:: https://bibliotekanauki.pl/articles/27312652.pdf
Data publikacji:: 2023
Wydawca:: Instytut Technologiczno-Przyrodniczy
Tematy:: aluminium slag waste
geospatial analysis
heavy metals pollution index
multivariate analysis
water quality index
Opis:: Aluminium slag waste is a residue from aluminium recycling activities, classified as hazardous waste so its disposal into the environment without processing can cause environmental problems, including groundwater pollution. There are 90 illegal dumping areas for aluminium slag waste spread in the Sumobito District, Jombang Regency. This study aims to evaluate the quality of shallow groundwater surrounding aluminium slag disposal in the Sumobito District for drinking water. The methods applied an integrated water quality index (WQI) and heavy metal pollution index (HPI), multivariate analysis (principal component analysis (PCA) and hierarchical clustering analysis (HCA)), and geospatial analysis for assessing groundwater quality. The field campaign conducted 40 groundwater samples of the dug wells for measuring the groundwater level and 30 of them were analysed for the chemical contents. The results showed that some locations exceeded the quality standards for total dissolved solids (TDS), electrical conductivity (EC), and Al2+ . The WQI shows that 7% of dug well samples are in poor drinking water condition, 73% are in good condition, and 20% are in excellent condition. The level of heavy metal contamination based on HPI is below the standard limit, but 13.3% of the water samples are classified as high contamination. The multivariate analysis shows that anthropogenic factors and natural sources/geogenic factors contributed to shallow groundwater quality in the study area. The geospatial map shows that the distribution of poor groundwater quality is in the northern area, following the direction of groundwater flow, and is a downstream area of aluminium slag waste contaminants.
Źródło:: Journal of Water and Land Development; 2023, 57; 78--90
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:: Derinkuyu dry bean irrigation planning in semi-arid climate by utilising crop water stress index values
Autorzy:: Uçak, Ali B.
Atılgan, Atılgan
Korytowski, Mariusz
Kocięcka, Joanna
Liberacki, Daniel
Stachowski, Piotr
Saltuk, Burak
Rolbiecki, Roman
Powiązania:: https://bibliotekanauki.pl/articles/28411640.pdf
Data publikacji:: 2023
Wydawca:: Instytut Technologiczno-Przyrodniczy
Tematy:: dry bean
crop water stress index
CWSI
irrigation time
plant water stress index
Turkey
Opis:: This study was conducted to determine crop water stress index (CWSI) values and irrigation timing in the case of Derinkuyu dry bean (Phaseolus vulgaris L.). In 2017, dry beans were grown as the main crop according to the field design consisting of plots divided into randomised blocks. Irrigation treatment comprised full irrigation (I100) and irrigation issues with three different levels of water stress (I66, I33, I0). This study applied 602 mm of water under the I100 irrigation. The yield of Derinkuyu dry beans was equal to 3576.6 kg∙ha-1 in I100 irrigation. The lower limit (LL) value, which is not necessary for the determination of CWSI, was obtained as the canopy-air temperature difference (Tc - Ta) versus the air vapour pressure deficit (VPD). The upper limit (UL) value, at which the dry beans were wholly exposed to water stress, was obtained at a constant temperature. The threshold CWSI value at which the grain yield of dry beans started to decrease was determined as 0.33 from the measurements made with an infrared thermometer before irrigation in I66 irrigation treatment. As a result, it can be suggested that irrigation should be applied when the CWSI value is 0.33 in dry beans. Furthermore, the correlation analysis revealed a negative correlation between grain yield and crop water stress index and a positive correlation between yield and chlorophyll content. According to variance analysis, significant relationships were found between the analysed parameters at p ≤ 0.01 and p ≤ 0.05.
Źródło:: Journal of Water and Land Development; 2023, 59; 145--152
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:: Physico-chemical and biological water quality of Warna and Pengilon Lakes, Dieng, Central Java
Autorzy:: Soeprobowati, Tri Retnaningsih
Addadiyah, Nurul Layalil
Hariyati, Riche
Jumari, Jumari
Powiązania:: https://bibliotekanauki.pl/articles/2048566.pdf
Data publikacji:: 2021
Wydawca:: Instytut Technologiczno-Przyrodniczy
Tematy:: Dieng
Lake Warna
Lake Pengilon
phytoplankton
pollution index
saprobic index
STORET method
water quality
Opis:: Warna and Pengilon Lakes are very close to each other and connected with the sill, a famous tourist destination in the Dieng Plateau Java. Land-use changes are the main problem that affected the lakes. The conversion of forest into an agricultural area had induced erosion and increased the volume of nutrients discharged to the lake due to high use of fertilisers in potatoes farms. In the dry seasons, water from those lakes was pumped to irrigate agricultural land. This study aimed to determine the water quality of Warna and Pengilon Lakes based on physical, chemical parameters, and phytoplankton communities. Water samples were collected from 4 sites at each lake to analyse biological oxygen demand (BOD), chemical oxygen demand (COD), ammonia, nitrate, nitrite, and total nitrogen (TN). Temperature, pH, dissolved oxygen (DO), turbidity, and conductivity (EC) were measured in-situ. During this research, turbidity and BOD in Warna and Pengilon Lakes exceeded the Indonesian water quality standard. Based on the STORET method, the water quality of Lake Warna was assessed as highly polluted for all classes. However, based on the pollution index (PI), Lake Warna was slightly to moderately polluted, as well as the saprobic index was in the β-mesosaprobic phase. Based on the species diversity index of phytoplankton, both Warna and Pengilon Lakes were moderately polluted. The long-term monitoring studies are necessary as an early warning sign of water quality degradation. Therefore, they provide insight into the overall ecological condition of the lake and can be used as a basis for developing suitable lake management.
Źródło:: Journal of Water and Land Development; 2021, 51; 38-49
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:: Groundwater quality assessment for drinking purposes using water quality index in Ali Al-Gharbi District, Iraq
Autorzy:: Al-Shammary, Sarteel Hamid Enad
Al-Mayyahi, Sattar Obaid Maiws
Powiązania:: https://bibliotekanauki.pl/articles/1841940.pdf
Data publikacji:: 2021
Wydawca:: Instytut Technologiczno-Przyrodniczy
Tematy:: drinking water
groundwater
Iraq
water quality index
Opis:: The present study aimed to assess groundwater quality according to the water quality index (WQI) in Ali Al- Gharbi district of the Maysan Governorate in eastern Iraq. For this purpose, 10 physical parameters such as pH, total hardness (TH), magnesium (Mg2+), calcium (Ca2+), potassium (K+), sodium (Na+), sulphate (SO42–), chloride (Cl–), nitrate (NO3–), and total dissolved solids (TDSs) were examined since 2019 from 16 different locations (viz. wells). The analysis results indicated that 18.75% of the water samples were of good quality, 56.25% of them had low quality, and 25% of such samples were very poor. The WQI also varied from 69.67 and 297.6. Therefore, prior to water use, there is a dire need for some treatments, as protecting this district from pollution is significant.
Źródło:: Journal of Water and Land Development; 2021, 50; 274-280
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:: Drought sensitivity characteristics and relationships between drought indices over Upper Blue Nile basin
Charakterystyka wrażliwości na suszę i zależności między jej wskaźnikami dla regionu górnego Nilu Błękitnego
Autorzy:: Kebede, Abebe
Raju, Jaya Prakash
Korecha, Diriba
Takele, Samuel
Nigussie, Melessew
Powiązania:: https://bibliotekanauki.pl/articles/292513.pdf
Data publikacji:: 2019
Wydawca:: Instytut Technologiczno-Przyrodniczy
Tematy:: drought
drought indices relationships
soil moisture index SMI
standardized reconnaissance drought index (RDIst)
standardized precipitation index SPI
surface runoff index (SRI)
standaryzowany wskaźnik odpływu (SRI)
susza
wskaźnik standaryzowanego opadu SPI
wskaźnik uwilgotnienia gleby SMI
zależność między wskaźnikami suszy
Opis:: Drought is an extreme event that causes great economic and environmental damage. The main objective of this study is to evaluate sensitivity, characterization and propagation of drought in the Upper Blue Nile. Drought indices: standardized precipitation index (SPI) and the recently developed standardized reconnaissance drought index (RDIst) are applied for five weather stations from 1980 to 2015 to evaluate RDIst applicability in the Upper Blue Nile. From our analysis both SPI and RDIst applied for 3-, 6-, 12 month of time scales follow the same trend, but in some time steps the RDIst varies with smaller amplitude than SPI. The severity and longer duration of drought compared with others periods of meteorological drought is found in the years 1984, 2002, 2009, 2015 including five weather stations and entire Upper Blue Nile. For drought relationships the correlation analysis is made across the time scales to evaluate the relationship between meteorological drought (SPI), soil moisture drought (SMI), and hydrological drought (SRI). We found that the correlation between three indices (SPI, SMI and SRI) at different time scales the 24-month time scale is dominant and are given by 0.82, 0.63 and 0.56.
Susza jest ekstremalnym zjawiskiem, które powoduje ogromne straty ekonomiczne i szkody środowiskowe. Celem badań było określenie wrażliwości na suszę, charakterystyk i propagacji suszy w regionie górnego Nilu Błękitnego. Dwa wskaźniki suszy – wskaźnik standaryzowanego opadu (SPI) i niedawno opracowany wskaźnik RDIst (ang. standardized reconnaissance drought index) zastosowano do danych z pięciu stacji meteorologicznych z lat 1980 do 2015, aby ocenić przydatność tego drugiego do oceny sytuacji w regionie. Z analiz przeprowadzonych przez autorów niniejszej publikacji wynika, że oba wskaźniki wykazywały podobny trend zmian w przedziałach czasowych 3-, 6- i 12-miesięcznych, ale w pewnych okresach wskaźnik RDIst cechowała mniejsza amplituda zmian niż wskaźnik SPI. W odniesieniu do pięciu stacji meteorologicznych i całego obszaru górnego biegu Nilu Błękitnego najbardziej surowe i długotrwałe susze stwierdzono w latach 1984, 2002, 2009 i 2015 w porównaniu z innymi latami badań. Wykonano także analizę korelacji między wskaźnikami suszy meteorologicznej SPI, suszy glebowej SMI i suszy hydrologicznej SRI. Najsilniejszą korelację między tymi wskaźnikami stwierdzono dla 24-miesięcznych przedziałów czasowych, a odpowiednie współczynniki korelacji wynosiły 0,82, 0,63 i 0,56.
Źródło:: Journal of Water and Land Development; 2019, 43; 64-75
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:: Porównanie i klasyfikacja warunków opadowych na podstawie wskaźnika standaryzowanego opadu i wskaźnika względnego opadu
Comparison and classification of precipitation conditions based on standarized SPI and relative RPI precipitation indices
Autorzy:: Gąsiorek, E.
Musiał, E.
Powiązania:: https://bibliotekanauki.pl/articles/339402.pdf
Data publikacji:: 2011
Wydawca:: Instytut Technologiczno-Przyrodniczy
Tematy:: miesięczne sumy opadów
wskaźnik standaryzowanego opadu
wskaźnik względnego opadu
monthly precipitation sums
relative precipitation index
standardized precipitation index
Opis:: Jedną z najbardziej znanych metod oceny warunków opadowych jest metoda oparta na wielkości opadów, określająca stosunek sumy opadu w danym okresie do średniej sumy wieloletniej przyjętej za normę. Ta metoda była podstawą opracowania przez KACZOROWSKĄ (1962) kryteriów dla lat i pór roku, według których można zidentyfikować badane okresy od skrajnie suchych do bardzo wilgotnych, wykorzystując wskaźnik względnego opadu RPI. Metoda identyfikacji miesięcznych sum opadów pod kątem ich nadmiaru lub niedoboru za pomocą wskaźnika względnego opadu jest opisywana w wielu pracach (KOSIBA 1948; PRZEDPEŁSKA 1971; RADOMSKI 1977; TOMASZEWSKA 1994). Celem pracy jest porównanie klasyfikacji opartej na dotychczas powszechnie stosowanym wskaźniku względnego opadu dla okresów miesięcznych z klasyfikacją opartą na coraz częściej stosowanym wskaźniku standaryzowanego opadu SPI. Badania przeprowadzono na podstawie danych pomiarowych pochodzących ze stacji Bydgoszcz- IMUZ w wieloleciu 1945-2003.
One of the best known methods for evaluating precipitation conditions is that assessing the precipitation as a ratio between the precipitation value in a given time period and the mean long term precipitation sum considered normal. This method was used by Kaczorowska in annual and seasonal criteria, according to which the given time periods can be classified from extremely dry to extremely wet with the use of relative precipitation index RPI. Identification of monthly precipitation sums, in view of their excess or deficit, by RPI was described in many publications (KOSIBA 1948; PRZEDPEŁSKA 1971; RADOMSKI 1977; TOMASZEWSKA 1994). The aim of our study was to compare the RPI-based, commonly used classification for monthly precipitation sums, with a new, more and more often applied, classification based on standardized precipitation index SPI. The investigation was performed on the data collected throughout the 1945- 2003 period in Bydgoszcz Observatory.
Źródło:: Woda-Środowisko-Obszary Wiejskie; 2011, 11, 4; 107-119
1642-8145
Pojawia się w:: Woda-Środowisko-Obszary Wiejskie
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Efficiency of some meteorological drought indices in different time scales, case study: wadi Louza basin (NW-Algeria)
Efektywność niektórych wskaźników suszy meteorologicznej w różnej skali czasu na przykładzie zlewni uedu Louza w północno-zachodniej Algierii
Autorzy:: Djellouli, F.
Bouanani, A.
Baba-Hamed, K.
Powiązania:: https://bibliotekanauki.pl/articles/293111.pdf
Data publikacji:: 2016
Wydawca:: Instytut Technologiczno-Przyrodniczy
Tematy:: drought
effective drought index
standardised precipitation index
wadi Louza
efektywny wskaźnik suszy
susza
ued Louza
wskaźnik standaryzowanego opadu
Opis:: Drought is an insidious hazard of nature in many parts of the world. It originates from persistent shortage of precipitation over a specific region for a specific period of time and has a conceptual and operational definition. Drought impact on some activity, group, or environmental sector depends on the extent of water shortage and ground conditions. Algeria and especially the western region has experienced several periods of drought over the last century, since 1975 to the present day. The most recent drought in 1981, 1989, 1990, 1992, 1994 and 1999 was characterized by its intensity and spatial extent. Drought is identified using various drought indices (meteorological, hydrological and agricultural). In this research, we focus on the meteorological drought, to assess the reliability of these indices under changing climatic conditions. Data was recorded for the period of 1980–2009 at wadi Louza catchment (NW-Algeria). For describing and monitoring drought severity periods, we calculated the correlation between both meteorological drought indices: Standardised Precipitation Index (SPI) and Effective Drought Index (EDI). The results show that the watershed of wadi Louza has experienced a severe meteorological drought. The correlation between meteorological drought indices was good for all time steps and the best was found for 9-month time step. The obtained results may provide some scientific support for fighting against droughts.
Susza jest naturalnym zagrożeniem w wielu częściach świata. Powstaje wskutek trwałego ograniczenia ilości opadów w danym regionie i okresie czasu. Jest zdefiniowana w sensie konceptualnym i operacyjnym. Wpływ suszy na różne rodzaje działalności człowieka i na środowisko zależy od rozmiaru deficytu wody i od warunków glebowych. Algieria, szczególnie jej zachodnia część doświadczyła okresów intensywnej suszy już w ubiegłym wieku, począwszy od roku 1975 r., i doświadcza ich po dzień dzisiejszy. Ostatnia susza charakteryzowała się dużą intensywnością i przestrzennym zasięgiem. Suszę identyfikuje się, używając różnych wskaźników meteorologicznych, hydrologicznych lub rolniczych. W badaniach prezentowanych w niniejszej pracy skupiono się na suszy meteorologicznej, aby ocenić wiarygodność tych wskaźników w zmieniających się warunkach klimatycznych. Dane notowano w okresie 1980–2009 w zlewni uedu Louza w północno-zachodniej Algierii. Na potrzeby charakterystyki i monitoringu okresów suszy obliczono korelację między dwoma wskaźnikami – wskaźnikiem standaryzowanego opadu (SPI) i efektywnym wskaźnikiem suszy (EDI). Wyniki dowodzą, że w zlewni uedu Louza wystąpiła głęboka susza meteorologiczna. Korelacja między wskaźnikami suszy meteorologicznej była dobra w odniesieniu do wszystkich kroków czasowych, ale najlepsza w odniesieniu do okresów 9-miesięcznych. Uzyskane wyniki mogą stanowić naukowe wsparcie w walce z suszą.
Źródło:: Journal of Water and Land Development; 2016, 31; 33-41
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:: 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: 13.

Tytuł:: Zmiany jakości wody w Strudze Dormowskiej w ciągu kilkudziesięciu lat na podstawie analizy wskaźników i indeksów biologicznych
Changes in water quality of struga dormowska stream over several years based on the analysis biological indicators and indices
Autorzy:: Graczyk, L.
Golski, J.
Trawiński, J.
Andrzejewski, W.
Mazurkiewicz, J.
Powiązania:: https://bibliotekanauki.pl/articles/338164.pdf
Data publikacji:: 2016
Wydawca:: Instytut Technologiczno-Przyrodniczy
Tematy:: belgijski indeks biotyczny (BBI)
bioindykator
indeks Ephemeroptera-Plecoptera-Trichoptera (indeks EPT)
ichtiofauna
makrobezkręgowce
bentosowe
polski indeks biotyczny (BMWP-PL)
wskaźnik saprobowy
wskaźnik Shannona–
Weavera (Sh–W)
abundance biomass/comparison (ABC)
Belgian biotic index (BBI)
benthic macroinvertebrates
bioindicators
Ephemeroptera-Plecoptera-Trichoptera index (EPT index)
ichthyofauna
Polish biotic index (BMWP-PL)
Shannon–Weaver index (Sh–W)
Opis:: Celem przedstawionych badań było określenie stanu ekologicznego Strugi Dormowskiej na podstawie struktury jakościowej i ilościowej bentosu oraz ichtiofauny, a także porównanie wyników otrzymanych na bazie wskaźników i indeksów biologicznych w ciągu kilkudziesięciu lat. Warunki środowiskowe cieku na odcinkach wytypowanych do badań różniły się między sobą pod względem morfometrii koryta, substratu dennego, temperatury i zawartości tlenu, a także wartości wskaźników i indeksów biologicznych. Na podstawie przeprowadzonych badań należy przyjąć, że wody Strugi Dormowskiej kwalifikują się do trzeciej klasy jakości wód. Niewątpliwy wpływ na stan ekologiczny rozpatrywanego cieku ma położenie zlewni, która obejmuje głównie obszary o charakterze rolniczym. Rzeka przepływa także przez tereny o wysokim potencjale turystyczno-rekreacyjnym, co może oddziaływać na strukturę jakościową i ilościową organizmów wskaźnikowych.
The aim of this study was to determine the ecological status of Struga Dormowska stream, based on qualitative and quantitative structure of benthic macroinvertebrates and ichthyofauna. The obtained results were compared to other studies, conducted for several decades. Based on the environmental conditions, research sites were varied due to riverbed morphometry, bottom substrate, temperature, dissolved oxygen and values of biological indicators and indices. Based on the obtained results, Struga Dormowska stream represent a third, sufficient class of water quality. The undoubted impact on ecological status of Struga Dormowska stream, has a location of catchment, which mainly covers the agricultural areas. The river also flows through areas with high potential for tourism and recreation, which may affect the species composition of benthic macroinvertebrates and fish.
Źródło:: Woda-Środowisko-Obszary Wiejskie; 2016, 16, 2; 37-48
1642-8145
Pojawia się w:: Woda-Środowisko-Obszary Wiejskie
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Groundwater quality composition and its suitability for drinking in long-term irrigated area
Autorzy:: Dinka, Megersa O.
Powiązania:: https://bibliotekanauki.pl/articles/947053.pdf
Data publikacji:: 2020
Wydawca:: Instytut Technologiczno-Przyrodniczy
Tematy:: contamination
drinking
groundwater
quality index
quality parameters
Wonji
Opis:: This study presents the hydrochemical composition of groundwater under long-term irrigation of Wonji plain (Ethiopia) and its quality status for drinking purpose. Groundwater samples were collected from 30 groundwater monitoring tube wells installed at different parts of the sugarcane plantation and then analysed for the major physico-chemical quality parameters (pH, EC, major cations and anions) following standard test procedures. The status of groundwater for drinking was compared with WHO and other quality standards. Analytical analysis results indicated that majority of the considered quality parameters are rated above the prescribed tolerable limits for drinking set by WHO. About 97% of the water samples has water quality index in the range of very poor to unfit for drinking. The contamination index is in the ranges of low (–1.0) to high (3.6). In general, the groundwater of the area is unsuitable for human consumption without proper treatment such as boiling, chlorination, filtering, distillation, desalinaization, defluoridation, deionization, demineralization (ionexchange) and membrane processes. Since the TDS concentration is relatively small (<2000 ppm), demineralization process alone can be sufficient to bring the water to an acceptable level.
Źródło:: Journal of Water and Land Development; 2020, 44; 43-54
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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