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Application of ANN-Based Streamflow Forecasting Model for Agricultural Water Management in the Awash River Basin,Ethiopia 总被引:1,自引:0,他引:1
This paper presents the application of a long-term streamflow forecasting model developed using artificial neural networks
at a stream gauging station in the Awash River Basin, Ethiopia. The gauging station is located above the headworks of a large
irrigation scheme called the Middle Awash Agricultural Development Enterprise (MAADE). Based on the forecasted streamflow
time series and water requirements for irrigation and environmental purposes, appropriate agricultural water management strategies
have been proposed for the irrigation scheme (MAADE). The water management strategies which were evaluated in this study are
based on different scenarios of abstraction demands. These demands were formulated based on a range of options for agricultural
development and change in MAADE. The scenarios evaluated were based on such factors as the existing planting patterns, changing
planting dates, changing crop varieties and reducing the area under cultivation. An appropriate scenario of agricultural development
was decided on the basis of the modified flows in the river vis-à-vis the trigger/threshold value established at the Melka
Sedi stream gauging station. Considering all the scenarios, it is suggested that a 1–24% reduction in the area currently irrigated
in the scheme will ensure a reliable supply of water to the scheme throughout the growing season and will provide sustainable
environmental flow in the river. 相似文献
2.
Chemeda Edossa Desalegn Mukand Singh Babel Ashim Das Gupta Bekele Awulachew Seleshi Douglas Merrey 《国际水资源开发杂志》2006,22(4):589-602
A survey was conducted in the Upper Awash River Basin, Ethiopia, to assess agricultural water management practices adopted by the farmers under drought conditions. The results show that on average drought prevails in the area once every two years and causes damage to both crops and livestock. Consequently, under such drought conditions, the farming communities have adopted various coping strategies and important among them are the sale of labour and sale of livestock and their products. The survey results also reveal that farmers in the rainfed agriculture areas practise mainly contour bunding to mitigate drought impacts. 相似文献
3.
Drought Analysis in the Awash River Basin,Ethiopia 总被引:6,自引:1,他引:5
Desalegn Chemeda Edossa Mukand Singh Babel Ashim Das Gupta 《Water Resources Management》2010,24(7):1441-1460
This study analyzes drought characteristics in the Awash River Basin of Ethiopia based on meteorological and hydrological
variables. Standardized precipitation index is used for temporal and spatial analyses of meteorological drought and the theory
of runs is used to define hydrological drought by considering streamflow as the drought indicator. Drought severity maps are
generated using Arc View/GIS by summarizing the percentage of occurrence of droughts in areas within the study basin. Extreme
drought category on 12-month time scale indicated that extreme events occur most frequently in the Upper and Middle Awash
Basin. However, while considering the overall categories of drought, the most frequent droughts occurred in the Middle and
Lower Awash Basin during the period of analysis. Similarly, results based on hydrological drought analysis shows that the
severest drought events occurred in the Middle Awash Basin during May 1988 to June 1988 and April 1998 to May 1998. Analysis
of the relationship between meteorological and hydrological drought indices in the basin shows that occurrence of hydrological
drought event at Melka Sedi stream gauging station lags meteorological drought event in the Upper Awash on average by 7 months
with a variation of 3 to 13 months. 相似文献
4.
Abdi Mohammed Alemayehu Chala Mashilla Dejene Chemeda Fininsa David A. Hoisington Victor S. Sobolev 《Food Additives and Contaminants: Part B: Surveillance Communications》2016,9(4):290-298
This study was conducted to assess major Aspergillus species and aflatoxins associated with groundnut seeds and cake in Eastern Ethiopia and evaluate growers’ management practices. A total of 160 groundnut seed samples from farmers’ stores and 50 groundnut cake samples from cafe and restaurants were collected. Fungal isolation was done from groundnut seed samples. Aspergillus flavus was the dominant species followed by Aspergillus parasiticus. Aflatoxin analyses of groundnut seed samples were performed using ultra performance liquid chromatography; 22.5% and 41.3% of samples were positive, with total aflatoxin concentrations of 786 and 3135 ng g?1 from 2013/2014 and 2014/2015 samples, respectively. The level of specific aflatoxin concentration varied between 0.1 and 2526 ng g?1 for B2 and B1, respectively. Among contaminated samples of groundnut cake, 68% exhibited aflatoxin concentration below 20 ng g?1, while as high as 158 ng g?1 aflatoxin B1 was recorded. The study confirms high contamination of groundnut products in East Ethiopia. 相似文献
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