Temat: rainfall - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: An empirical model of rainfall intensity as a function of rainfall duration and probability of occurrence
Autorzy:: Harisuseno, Donny
Prasetyorini, Linda
Fidari, Jadfan S.
Chandrasasi, Dian
Powiązania:: https://bibliotekanauki.pl/articles/2203546.pdf
Data publikacji:: 2023
Wydawca:: Instytut Technologiczno-Przyrodniczy
Tematy:: empirical model
probability of occurrence
rainfall duration
rainfall intensity
recurrence interval
Opis:: Rainfall is one of the main components of the hydrologic cycle; thus, the availability of accurate rainfall data is fundamental for designing and operating water resources systems and infrastructure. This study aims to develop an empirical model of rainfall intensity (It,p) as a function of its probability (p) and duration (t). In 1999-2020, data on the hourly duration of rainfall were collected from automatic rainfall recorder (ARR) gauges. The empirical model has been developed using a statistical approach based on duration (t) and probability (p), and subsequently they have been validated with those obtained from ARR data. The resulting model demonstrates good performance compared with other empirical formulas (Sherman and Ishiguro) as indicated by the percent bias (PBIAS) values (2.35-3.17), ratio of the RMSE (root mean square error) between simulated and observed values to the standard deviation of the observations (RSR, 0.028-0.031), Nash-Sutcliffe efficiency (NSE, 0.905-0.996), and index of agreement (d, 0.96-0.98) which classified in the rating of “very good” in model performance. The reliability of the estimated intensity based on the empirical model shows a tendency to decrease as duration (t) increases, and a good accuracy mainly for the rainfall intensity for shorter periods (1-, 2-, and 3-hours), whereas low accuracy for long rainfall periods. The study found that the empirical model exhibits a reliable estimate for rainfall intensity with small recurrence intervals (Tr) 2-, 5-, 10-, and a 20-year interval and for a shorter duration (t). Validation results confirm that the rainfall intensity model shows good performance; thus, it could be used as a reliable instrument to estimate rainfall intensity in the study area.
Źródło:: Journal of Water and Land Development; 2023, 56; 182--193
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:: Analysis and Mapping of Water Erosion Vulnerability Using GIS for the Mghila Watershed, Northwest of Algeria
Autorzy:: Ratiat, Abdelkader
Haddad, Ali
Bouaichi, Ilham
Matene, Chahrazed Naziha
Powiązania:: https://bibliotekanauki.pl/articles/31340452.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:: water erosion
silting
extreme rainfall
extreme runoff
arid regions
sediment transport
Opis:: Intensification of extreme rainfall-runoff events in arid and semi-arid regions because of climate change induce the water erosion that contributes considerably to the loss of vegetal layers of soils and reduce the storage capacity of dams by silting of transported sediments from the watershed to the impoundment. This paper aims at proposing means for protecting the Mghila dam against silting by identification and delimitation of vulnerable areas to water erosion. This dam, built in the North-West of Algeria, ensures irrigated cultivation. Topographical, geological, and land use characteristics of the watershedwere analyzed using the geographic information system (GIS). Analysis of results has allowed the identification by area percentage four-vulnerability classes with sensitivity to the water erosion: low (18.89%), medium (13.08%), high (65.05%) and very high (8.38%). The spatial distribution of the lithological substratum friability, the vegetation cover and slope degrees have led to the development of an efficient strategy for the watershed management in order to reduce the effect of water erosion on soil degradation and silting of the Mghila dam.
Źródło:: Archives of Hydro-Engineering and Environmental Mechanics; 2023, 70, 1; 71-87
1231-3726
Pojawia się w:: Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Enhancing the performance of deep learning technique by combining with gradient boosting in rainfall-runoff simulation
Autorzy:: Abdullaeva, Barno S.
Powiązania:: https://bibliotekanauki.pl/articles/28411647.pdf
Data publikacji:: 2023
Wydawca:: Instytut Technologiczno-Przyrodniczy
Tematy:: deep learning
gradient boosting
hybrid model
multi-step ahead forecasting
rainfall-runoff simulation
Opis:: Artificial neural networks are widely employed as data mining methods by researchers across various fields, including rainfall-runoff (R-R) statistical modelling. To enhance the performance of these networks, deep learning (DL) neural networks have been developed to improve modelling accuracy. The present study aims to improve the effectiveness of DL networks in enhancing the performance of artificial neural networks via merging with the gradient boosting (GB) technique for daily runoff data forecasting in the river Amu Darya, Uzbekistan. The obtained results showed that the new hybrid proposed model performed exceptionally well, achieving a 16.67% improvement in determination coefficient (R2) and a 23.18% reduction in root mean square error (RMSE) during the training phase compared to the single DL model. Moreover, during the verification phase, the hybrid model displayed remarkable performance, demonstrating a 66.67% increase in R2 and a 50% reduction in RMSE. Furthermore, the hybrid model outperformed the single GB model by a significant margin. During the training phase, the new model showed an 18.18% increase in R2 and a 25% reduction in RMSE. In the verification phase, it improved by an impressive 75% in R2 and a 33.33% reduction in RMSE compared to the single GB model. These findings highlight the potential of the hybrid DL-GB model in improving daily runoff data forecasting in the challenging hydrological context of the Amu Darya River basin in Uzbekistan.
Źródło:: Journal of Water and Land Development; 2023, 59; 216--223
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:: Prognozowanie efektów produkcyjnych deszczowania roślin na podstawie wyników badań polowych
Forecasting the production effects of plant irrigation based on long-term results of field experiments
Autorzy:: Kuśmierek-Tomaszewska, Renata
Żarski, Jacek
Dudek, Stanisław
Powiązania:: https://bibliotekanauki.pl/articles/20432142.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
Tematy:: nawadnianie deszczowniane
przyrost plonu
niedobory opadów
bobik
rzepak ozimy
burak cukrowy
soja
sprinkler irrigation
yield increase
rainfall deficiency
faba bean
winter rapeseed
sugar beet
soybean
Opis:: W pracy przedstawiono efekty produkcyjne deszczowania buraka cukrowego, rzepaku ozimego, jęczmienia jarego, soi oraz bobiku, uzyskane w wieloletnich (2005-2020) eksperymentach polowych. Doświadczenia prowadzono na glebie lekkiej o zwięzłym podłożu w rejonie Bydgoszczy. Wykazano istotne, prostoliniowe zależności między zwyżkami plonów roślin pod wpływem deszczowania a sumami opadów w okresach wegetacji tych roślin, zwłaszcza w fazach wzmożonego zapotrzebowania na wodę. Średnie wieloletnie efekty produkcyjne deszczowania badanych upraw, które zaprezentowano w pracy oraz ich zmienność w okresie wieloletnim, mogą stanowić podstawę oceny celowości deszczowania roślin w porównywalnych warunkach glebowych i opadowych.
The paper presents the production effects of irrigation of sugar beet, winter rape, spring barley, soybean and faba bean, obtained in long-term (2005-2020) field experiments. The experiments were carried out on light soil with compact subsoil in the Bydgoszcz area. Significant, rectilinear relationships were found between increases in plant yields under the influence of sprinkler irrigation and precipitation totals in the vegetation periods of these plants, especially in the phases of increased water demand. The average long-term production effects of irrigation of the surveyed crops, which are presented in the work and their variability over the long-term period, may be the basis for assessing the desirability of irrigation of plants in areas of comparable soil and precipitation conditions.
Źródło:: Infrastruktura i Ekologia Terenów Wiejskich; 2023, I/1; 71--87
1732-5587
Pojawia się w:: Infrastruktura i Ekologia Terenów Wiejskich
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Status prawny wód opadowych i roztopowych
Legal status of rainwater and snowmelt
Autorzy:: Krzyż, Paweł Bartłomiej
Powiązania:: https://bibliotekanauki.pl/articles/46606713.pdf
Data publikacji:: 2023
Wydawca:: Wydawnictwo Uniwersytetu Śląskiego
Tematy:: water
rainfall
meltwater
property
use
Opis:: This article is a comprehensive analysis of the legal status of rainwater and snowmelt. The study will attempt to distinguish these waters in an objective way, identify their specific legal context and, finally, establish their civil law status. Incidentally, the issues related to the acquisition of ownership of rainwater and snowmelt by property owners, treatment and use of these waters.
Źródło:: Prawne Problemy Górnictwa i Ochrony Środowiska; 2023, 1; 1-20
2451-3431
Pojawia się w:: Prawne Problemy Górnictwa i Ochrony Środowiska
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Tendencje zmian klimatycznych wskaźników potrzeb nawadniania roślin w Polsce w latach 1991-2020
Trends in climate change of indicators of plant irrigation needs in Poland in 1991-2020
Autorzy:: Żarski, Jacek
Kuśmierek-Tomaszewska, Renata
Powiązania:: https://bibliotekanauki.pl/articles/20432140.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
Tematy:: temperatura powietrza
opady atmosferyczne
susza atmosferyczna
niedobór opadów
air temperature
precipitation
atmospheric drought
rainfall deficiency
Opis:: Przeprowadzono ocenę zmienności czterech klimatycznych wskaźników potrzeb nawadniania roślin w I strefie celowości stosowania tego zabiegu w Polsce (temperatura powietrza, opady atmosferyczne, częstość susz atmosferycznych, niedobory opadów). Analiza dotyczyła czterech miejscowości (Szczecin, Poznań, Kalisz, Toruń), wielolecia referencyjnego 1991-2020 oraz fragmentów i całego okresu aktywnego wzrostu roślin (V-VIII). Badania wykazały dość jednoznaczny wzrost potrzeb nawadniania pod względem kryterium klimatycznego. Wynika on przede wszystkim z istotnego wzrostu temperatury powietrza, skutkującego zwiększeniem się potrzeb wodnych roślin. Wykazano tendencję do pogłębiania się niedoborów opadowych w wieloleciu 1991-2020 na Nizinie Szczecińskiej i w Wielkopolsce oraz zidentyfikowano dużą liczbę susz atmosferycznych o zwiększonej intensywności w latach 2015-2020.
An assessment of the variability of four climatic indicators of plant irrigation needs (air temperature, precipitation, frequency of atmospheric droughts, rainfall shortages) in the 1st zone of irrigation application in Poland was carried out. The analysis concerned four localities (Szczecin, Poznań, Kalisz, Toruń) during the reference multiyear period 1991-2020, in the entire period of active plant growth (V-VIII) as well as the parts of it. Results of the analysis have shown a fairly clear increase in irrigation needs in terms of the climatic criterion. It results primarily from a significant increase in air temperature, resulting in an increase in the water needs of plants. For the period 1991-2020 tendency to deepening rainfall shortages in the Szczecin Lowland and in Wielkopolska was demonstrated. The large numbers of atmospheric droughts with higher level of intensity were identified in the second part of the analysed period in the years 2015-2020.
Źródło:: Infrastruktura i Ekologia Terenów Wiejskich; 2023, I/1; 88--103
1732-5587
Pojawia się w:: Infrastruktura i Ekologia Terenów Wiejskich
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Wyznaczanie natężenia opadu na podstawie danych z radarów z podwójną polaryzacją fali elektromagnetycznej
Determination of precipitation intensity based on data from dual polarisation radar
Autorzy:: Dzwonkowski, Karol
Winnicki, Ireneusz
Pietrek, Sławomir
Powiązania:: https://bibliotekanauki.pl/articles/27323999.pdf
Data publikacji:: 2023
Wydawca:: Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:: inżynieria lądowa
geodezja
transport
teledetekcyjne badanie atmosfery
radar z podwójną polaryzacją fali elektromagnetycznej
odbiciowość radarowa
natężenie opadu
grad
civil engineering
geodesy
remote sensing of the atmosphere
dual polarization radar
radar reflectivity
rainfall intensity
hail
Opis:: W pracy przedstawiono wyniki pilotażowych badań stref zachmurzenia z opadem gradu na podstawie danych z radaru z podwójną polaryzacją fali elektromagnetycznej pracującego w Rzeszowie-Jasionce, który jest jednym z ośmiu radarów meteorologicznych tworzących nową sieć POLRAD zarządzaną przez Instytut Meteorologii i Gospodarki Wodnej - PIB. Skanowanie atmosfery falą o podwójnej polaryzacji dostarcza znaczną ilość danych radarowych, które dokładnie opisują wykryte obiekty meteorologiczne, w tym rozmiary cząsteczek chmurowych i opadowych. Przeprowadzone badania umożliwiły jakościowy i ilościowy opis stref zachmurzenia z opadem atmosferycznym o zmiennej intensywności oraz ze zmiennym rozkładem przestrzennym i czasowym. Uzyskanie danych o strukturze strefy zachmurzenia wymaga stworzenia nowych niestandardowych zobrazowań przedstawiających horyzontalne i pionowe rozkłady odbiciowości radarowej wyznaczonej na podstawie pomiarów w kanale klasycznym radaru. Dane radarowe przetworzono z wykorzystaniem oprogramowania RAINBOW DART i RAPOK. Wygenerowano całkowicie nowe zbiory danych opadowych dla wybranego rejonu z zachowaniem zgodności miejsca oraz terminu obserwacji, w których uwzględniono natężenie opadu, stan fazowy oraz czynniki środowiskowe. Opracowane pionowe przekroje radioech wzdłuż zadanej trasy dostarczyły informacje o strukturze i aktywności badanej komórki burzowej oraz występującym rdzeniu opadowym. Natężenie opadu atmosferycznego wyznaczono z zależności Marshalla-Palmera, Jossa oraz Muchnika, w których użyto odbiciowości radarowej na wysokościach 1 km, 1,5 km i 2 km nad powierzchnią gruntu z uwzględnieniem poziomu zamarzania. W pracy przedstawiono kompleksową analizę sytuacji wystąpienia opadu gradu na podstawie danych synoptycznych oraz zobrazowań natężenia opadu i prawdopodobieństwa jego wystąpienia. Wykazano, że dostępne w sieci wymiany danych meteorologicznych standardowe zobrazowanie natężenia opadu generowane każdorazowo na podstawie zależności Marshalla–Palmera dla odbiciowości radarowej na wysokości 1 km nad powierzchnią gruntu może zawierać błędy, których zminimalizowanie wymaga dokonania zmian w algorytmach obliczeniowych. Na tym etapie badań w obliczeniach wykorzystano inne zależności, przy wyborze których uwzględniono rodzaj opadu. Natomiast dane o strukturze badanej komórki burzowej pozwoliły na obliczenia na podstawie wartości odbiciowości radarowej wyznaczonych na różnych poziomach w rdzeniu opadowym. Analizę otrzymanych radarowych danych opadowych prowadzono na podstawie zarówno danych synoptycznych, jak i klimatycznych dla badanego rejonu. W następnym etapie badań wykorzystane zostaną wyniki pomiarów terenowych prowadzonych w rejonach z rozbudowaną siecią bezpośrednich pomiarów opadów atmosferycznych. Wyniki tych badań pozwolą na rekomendowanie zależności empirycznych do wyznaczania natężenia opadu w zależności od rodzaju opadu, budowy chmury opadowej oraz warunków środowiskowych.
The paper presents the results of a preliminary study of cloudiness area with hail precipitation based on data from a dual-polarisation electromagnetic wave radar operating in Rzeszów-Jasionka which is one of eight meteorological radars belonging to the POLRAD managed by the Institute of Meteorology and Water Management - National Research Institute. Atmospheric dual-polarisation wave scanning provides a significant radar data that accurately describes detected meteorological objects, including the sizes of cloud and precipitation particles. The conducted research enabled us a qualitative and quantitative description of cloudy zones with precipitation of variable intensity and variable spatial and temporal distribution. Obtaining data on the structure of the cloud cover zone requires the creation of new and non-standard imagery showing horizontal and vertical distributions of radar reflectivity determined on the basis of measurements in the classic radar channel. Radar data were processed using RAINBOW DART and RAPOK software. Completely new rainfall datasets were generated for the selected region with consistency of location and observation date, in which precipitation intensity, phase state, and environmental factors were taken into account. Developed vertical cross-sections of the atmosphere along the set route provided information on the structure and activity of the studied storm cell and the precipitation core present. Precipitation intensity was determined from the Marshall‒Palmer, Joss and Muchnik correlations, which used radar reflectivity at heights of 1 km, 1.5 km, and 2 km above the ground surface, taking into account the freezing level. The paper presents a comprehensive analysis of the hail situation based on synoptic data and images of hail intensity and hail probability. It was shown that, available in the meteorological data exchange network, the standard images of precipitation intensity generated in each case based on the Marshall-Palmer correlation for radar reflectivity at a height of 1 km above the ground surface may contain errors, which require changes in calculation algorithms to be minimised. At this stage of the research, other dependencies were used in the calculations, which took into account the type of precipitation. On the other hand, data on the structure of the studied storm cell allowed us calculations based on the values of radar reflectivity determined at different levels in the rain core. The analysis of the obtained radar precipitation data was carried out on the basis of both syn-optic and climatic data for the studied region. In the next stage of research, the results of field meas-urements carried out in regions with an extensive network of direct precipitation measurements will be used. The results of these studies will allow us to recommend empirical relationships for determining precipitation intensity depending on the type of precipitation, the structure of the precipitation cloud and environmental conditions.
Źródło:: Biuletyn Wojskowej Akademii Technicznej; 2023, 72, 1; 79--100
1234-5865
Pojawia się w:: Biuletyn Wojskowej Akademii Technicznej
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Climate Change and its Effect on the Energy Production from Renewable Sources – A Case Study in Mediterranean Region
Autorzy:: Gjika, Eralda
Basha, Lule
Sokoli, Arnisa
Powiązania:: https://bibliotekanauki.pl/articles/2202305.pdf
Data publikacji:: 2022
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: energy production
temperature
rainfall
CO2 emission
machine learning model
Opis:: In terms of climate forecasting, the Mediterranean region is among the most difficult. It is correlated with the five significant subtropical high pressure belts of the oceans and is symbolized by dry and hot summer and cold and rainy winter. Due to its location in the area, Albania is particularly susceptible to climatic changes. It has been noted that summertime sees the greatest temperature increases. More intense heat waves that stay longer and occur more frequently are anticipated in the eastern Mediterranean. The seasonal patterns of precipitation have not changed, but the amount of rain has become more intense. The effects of climate change have drawn attention to various renewable energy sources, including solar and wind power. In this study, the changes and prospective in average temperature, rainfall, humidity, CO2 emission and their impact in energy production were investigated. Several different models such as Auto Regressive Integrated Moving Average method; Prophet algorithm; Elastic-Net Regularized Generalized Linear Model; Random Forest Regression models; Prophet Boost algorithm; have been built for the study and prediction of each variable. The appropriate models are used to determine the anticipated values of the indicators for a period of four years. The prediction shows an increase in CO2 emission which leads to a decrease in energy production by hydropower. These findings suggest the use of other renewable sources for energy production in the country and the Mediterranean region.
Źródło:: Journal of Ecological Engineering; 2022, 23, 12; 285--298
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Digital Elevation Model resolution and its impact on the spatial pattern of rainfalltemperature prediction at the catchment scale: The case of the Mille catchment, Ethiopia
Autorzy:: Bati, Hirpo Gudeta
Powiązania:: https://bibliotekanauki.pl/articles/2058419.pdf
Data publikacji:: 2022
Wydawca:: Instytut Meteorologii i Gospodarki Wodnej - Państwowy Instytut Badawczy
Tematy:: KED
Mille catchment
mountainous catchment
rainfall
DEM resolution
temperature
Opis:: In a mountainous catchment, understanding the interaction between DEM resolution and climatic variables is essential for the accurate spatial interpolation of areal mean monthly and annual rainfall and temperature, which is required as an input for further applications such as hydrological and hydraulic modeling, agriculture, and environmental conservation. This case study applied the geostatistical interpolation technique, kriging with external drift (KED), with a digital elevation model (DEM) with various horizontal resolutions, which were used to assess the effects of the DEM horizontal resolutions on the spatial distributions of rainfall and temperature by focusing on interpolating the mean monthly and annual rainfall and temperature over a spatially diversified catchment. The assessment was undertaken using spatially and temporally complete sampled historical climatic datasets, and consequently, the spatial pattern of monthly and annual rainfall (temperature) from east to the west gradually increases or decreases following the DEM elevation increment along the same direction. As a result, the finer-resolution DEM (90-m SRTM-DEM) had a considerable impact on predicting the mean monthly minimum and maximum temperatures, whereas the resampled 500-m SRTM-DEM performed relatively better in mean monthly and annual rainfall and annual minimum temperature estimation values.
Źródło:: Meteorology Hydrology and Water Management. Research and Operational Applications; 2022, 10, 1; 26--46
2299-3835
2353-5652
Pojawia się w:: Meteorology Hydrology and Water Management. Research and Operational Applications
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Dynamika zmian sumy i struktury opadów w Wielkopolsce w latach 1981–2020
The dynamics of changes in the sum and structure of atmospheric precipitation in Wielkopolska in 1981–2020
Autorzy:: Walkowska, Anita
Półrolniczak, Marek
Kolendowicz, Leszek
Powiązania:: https://bibliotekanauki.pl/articles/43348607.pdf
Data publikacji:: 2022
Wydawca:: Poznańskie Towarzystwo Przyjaciół Nauk
Tematy:: precipitation
rainfall
snowfall
Wielkopolska
Opis:: The study analyzes the temporal and spatial variability of atmospheric precipitation and the impact of global climate changes on precipitation in Wielkopolska. The study was based on data provided by the IMGW-PIB and collected from 5 synoptic stations located in central Poland. The average multiannual sums of precipitation, the average number of days with precipitation in total and the particular types of precipitation in 1981–2020 were calculated, and their spatial distribution presented. Moreover, seasonal precipitation totals and statistics for days with precipitation were also calculated, and trends of individual pluviometric characteristics presented. The average annual rainfall was 523 mm, and the average annual rainfall frequency was 163 days. Days with rainfall were more frequent than days with snow (35 days). Over the course of many years, there was an apparent decrease in days with snowfall (-6.5 per decade) and an increase in the number of rainy days (4.3 per decade). Annual precipitation totals show no significant long-term changes.
Źródło:: Badania Fizjograficzne Seria A - Geografia Fizyczna; 2022, 13 (73); 207-226
2081-6014
Pojawia się w:: Badania Fizjograficzne Seria A - Geografia Fizyczna
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Extreme Rainfall-Runoff Events Modeling Using HEC-HMS Model for Oued El Hachem Watershed, Northern Algeria
Autorzy:: Haddad, Ali
Powiązania:: https://bibliotekanauki.pl/articles/31340348.pdf
Data publikacji:: 2022
Wydawca:: Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:: dam safety
HEC-HMS model
hydrologic modeling
model calibration
rainfall-runoff
arid region
Opis:: Flood forecasting has become necessary for dam management during extreme hydrological events. The lack of streamflow data in ungauged watersheds of arid and semi-arid regions makes the assessment of water resources difficult. In this paper, the Hydrologic Modeling System developed by the Hydrologic Engineering Center (HEC-HMS) was applied to the Oued El Hachem watershed. Calibration and validation of the model have been performed, taking into account the lag time and the curve number CN that is expressed as a function of soil group, land use and antecedent runoff condition. The model was evaluated on the basis of the coefficient of determination, the Nash Sutcliffe Efficiency (NSE), and the percentage differences between peak and volume. Performance indices of calibration showed a good agreements between observed and computed flows. The validation of the model has given satisfactory results. The calibrated model can be used to manage the dam of Boukerdane during extreme rainfall events by forecasting the induced hydrographs from which adequate procedures will be operated in order to ensure the safety of the dam against possible overtopping.
Źródło:: Archives of Hydro-Engineering and Environmental Mechanics; 2022, 69, 1; 45-57
1231-3726
Pojawia się w:: Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Flow Rate Determination as a Function of Rainfall for the Ungauged Suhareka River
Autorzy:: Kusari, Laura
Osmanaj, Lavdim
Shehu, Hana
Bungu, Samir
Powiązania:: https://bibliotekanauki.pl/articles/2086389.pdf
Data publikacji:: 2022
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: catchment area
regression coefficient
CN parameter
rainfall intensity
flow curve
rainfall
flood
Opis:: For ungauged rivers, when there are no hydrological measurements and there is a lack of data on perennial flow rates, the latter one to be determined based on other hydrological data. The river Suhareka catchment represents a similar case. Since there is no data on Suhareka’s flow rates, the authors of this study aimed for the flow rate determination based on rainfall measurements. From the available data on annual precipitation (monthly sums) provided by the Kosovo Hydrometeorological Institute for the Suhareka hydrometric station, the observed monthly rainfall data for 30 years were analysed. Those gaps were initially filled by connecting the hydrometric station in Suhareka with those of Prishtina, Prizren and Ferizaj, and as a result a fairly good fit was ensured. Moreover, the intensity-duration-frequency curves were formed using the expression of Sokolovsky, as a mathematical model of the dependence I (T, P). For a transformation of rainfall into flow, the American method SCS was used. As a result, the equation for the Suhareka River basin was derived, which enabled the determination of maximum inflows, for different return periods. The results obtained through this paper, indicates that even for ungauged river basins the peak flows can be determined from available rainfall data.
Źródło:: Journal of Ecological Engineering; 2022, 23, 4; 110--121
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Impact of rainfall trends on flood in Agnéby watershed
Autorzy:: Konin, N’Da Jean Claude
N’go, Yao Alexis
Soro, Gneneyougo Emile
Goula, Bi Tié Albert
Powiązania:: https://bibliotekanauki.pl/articles/2073726.pdf
Data publikacji:: 2022
Wydawca:: Instytut Technologiczno-Przyrodniczy
Tematy:: Agnéby watershed
flood
hydro-rainfall hazard
Ivory Coast
rainfall trend
Opis:: The aim of this study is to analyse the spatio-temporal evolution of hydro-rainfall variables in the Agnéby watershed in a disturbed climatic context. Rainfall data from the stations of Arrah, Bongouanou, M’Batto, Akoupé, Céchi, Agboville, Adzopé, Sikensi, Abidjan Airport and Dabou as well as hydrometric data from the stations of Agboville, Offoliguié, M’Bessé and Guessiguié were used. The methodological approach is based on the application of independence and trend tests and spatio-temporal analysis of daily rainfall maxima, duration of consecutive rainfall events, number of rainfall events above a threshold and daily flow maxima. The hypothesis of independence justified the relevance of the choice of variables. The trend test showed the dynamic upward evolution of extreme rainfall and the decrease in the duration of consecutive rainy episodes, in the number of rainy episodes and in the flows feeding the main watercourse. Moreover, spatial analysis of daily maximum rainfall amounts above 120 mm, consecutive maximum rainfall amounts above 160 mm and Gumbel rainfall amounts above 190 mm indicated heavy rainfall in the southern part of the watershed. However, a decrease in rainfall is recorded in the areas covered by the stations of Arrah, Bongouanou, M’Batto, Ce chi and Akoupé. An increase in the flood flow calculated from the Generalized Extreme Value (GEV) between 76.60 m3∙s-1 and 225.70 m3∙s-1 is presented in the main river. The spatio-temporal variation in annual rainfall heights showed a high rainfall in the southern part of the watershed with a decrease in rainfall over the decades (1976-1985 and 1996-2005) followed by an increase over the decades (1986-1995 and 2006-2015). Despite the general decrease in rainfall, extreme rainfall has become frequent, causing flooding in the watershed.
Źródło:: Journal of Water and Land Development; 2022, 52; 9--20
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:: Precipitation amounts triggering landslide processes in the western part of the Nałęczów Plateau (Lublin Upland, Poland)
Autorzy:: Demczuk, Piotr
Zydroń, Tymoteusz
Szafran, Tomasz
Powiązania:: https://bibliotekanauki.pl/articles/15805023.pdf
Data publikacji:: 2022
Wydawca:: Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:: slope stability
shallow landslide
rainfall thresholds
loess
the Nałęczów Plateau
Opis:: This study covers the western part of Poland’s loess Nałęczów Plateau (Kazimierz Dolny, Zbędowice). Mass movements in the Lublin Upland occur during periods of increased precipitation or after a snowy and cold winter. To date, there are no comprehensive studies on active (precipitation, hydrology, vegetation, land use, anthropogenic factors) or passive factors (lithology, slope angle) causing such geohazards in this region. This area’s formations are characterised by high sensitivity to even small changes in moisture content; thus, their geotechnical parameters deteriorate as a result of precipitation or rising groundwater levels. The calculations in this study were chosen to determine the time necessary for ground response to external factors, in addition to determining the impact of these factors on decreases in the factor of safety (FS). Based on calculations in GeoStudio software, the impacts of rainfall totals and duration on slope failure, interpreted as an event where the FS falls below 1.0, were analysed. Accordingly, the threshold rainfall value was determined as the total rainfall at the time of slope failure. The study’s results indicate that loess covers are characterised by average water permeability, relatively high internal friction angles and low cohesion, which, combined with high slope inclination, favour landslide formation even when the slope is only partially saturated. The most unfavourable stability conditions occur at the beginning of spring, indicating that loess stability is significantly affected by snowmelt and precipitation at the beginning of the vegetation season, as well as the occurrence of episodic intense precipitation during the summer.
Źródło:: Quaestiones Geographicae; 2022, 41, 3; 33-51
0137-477X
2081-6383
Pojawia się w:: Quaestiones Geographicae
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: Rainfall Threshold for Landslide Warning in Southern Thailand – An Integrated Landslide Susceptibility Map with Rainfall Event – Duration Threshold
Autorzy:: Salee, Rattana
Chinkulkijniwat, Avirut
Yubonchit, Somjai
Bui Van, Duc
Powiązania:: https://bibliotekanauki.pl/articles/2202301.pdf
Data publikacji:: 2022
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: rainfall threshold
landslide susceptibility level
contingency matrix
skill score
Opis:: Southern Thailand is one of hotspots for landslides. So far, the rainfall triggered landslides in this region caused many sufferers and fatalities. On the basis of the rainfall data that triggered ninety-two landslide events during 1988–2018 and the landslide susceptibility maps published by the Department of Mineral Resources (DMR), this study introduced rainfall event-duration (ED) thresholds, namely EDm and EDh thresholds, for the places classified as the modest and the huge susceptibility levels, respectively. The modest susceptibility is a combination of very low, low, and moderate landslide susceptibility levels indicated in DMR maps. The huge susceptibility is a combination of high and very high landslide susceptibility levels indicated in DMR maps. Indicated by an area under the receiver operating characteristic curve (AUC), the EDm and EDh thresholds yielded the significantly better predictability than the original threshold did. Furthermore, the EDm threshold yielded the perfect prediction with AUC of 1.00.
Źródło:: Journal of Ecological Engineering; 2022, 23, 12; 124--133
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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