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IMPACT OF HEADWATER HYDROLOGICAL DEFICIT ON THE DOWNSTREAM FLOOD‐BASED FARMING SYSTEM IN NORTHERN ETHIOPIA
Irrigation and Drainage ( IF 1.9 ) Pub Date : 2020-02-12 , DOI: 10.1002/ird.2413
Emnet Negash 1, 2 , Girmay Gebresamuel 3 , Tesfa‐alem Embaye 4 , Alick Nguvulu 2 , Hailemariam Meaza 5 , Misgina Gebrehiwot 5 , Biadgilgn Demissie 5, 6 , Tesfaalem Gebreyohannes 5 , Jan Nyssen 7 , Amanuel Zenebe 1, 3
Affiliation  

Flood-based farming is a means of improving crop production in rain-deficit lowlands. Such spate irrigation systems grow in importance; though effects of headwater hydrological deficit on downstream flood-farming are lacking evidence. This study investigates the impacts of headwater hydrological deficit on the extent of spate-irrigated agriculture in Guguf spate system. Length of canals and area of spate-irrigated agriculture to the right and left of Guguf River for 1980s and 2010s were tracked using Global Positioning System and mapped in a Geographic Information System interface; while climate data collected from National Meteorological Agency. Trends for selected hydroclimatic variables were analysed using linear regression and Pettitt-test. Flash-flood shrunk by 7.36x10 m; as a result of which length of canals and area of spate-based farms declined by 1.37 km and 1540 ha, i.e., 35 and 57.5%, respectively, only in three decades time. This corresponds to an average withdrawal of -44.0 ha † Impact du déficit hydrologique en amont sur le système agricole inondable en aval dans le nord de l'Éthiopie  Correspondence to: Emnet Negash. Institute of Climate and Society, Mekelle University, Mek’ele 231, Ethiopia. E-mail: emnet.negash@mu.edu.et

中文翻译:

埃塞俄比亚北部水源水文亏缺对下游洪水农业系统的影响

以洪水为基础的农业是在缺水低地提高作物产量的一种手段。这种喷灌系统变得越来越重要;尽管源头水文亏缺对下游洪水农业的影响缺乏证据。本研究调查了上游水文亏缺对 Guguf 喷灌系统喷灌农业范围的影响。使用全球定位系统跟踪了 1980 年代和 2010 年代古古夫河左右两侧的运河长度和喷灌农业面积,并在地理信息系统界面中绘制了地图;而气候数据是从国家气象局收集的。使用线性回归和佩蒂特检验分析选定水文气候变量的趋势。山洪减少了 7.36x10 米;因此,仅在 30 年的时间里,运河长度和分流农场面积就分别减少了 1.37 公里和 1540 公顷,即分别减少了 35% 和 57.5%。这对应于 -44.0 公顷的平均取水量 † Impact du déficit hydrologique en amont sur le système agricole inondable en aval dans le nord de l'Éthiopie  通讯作者:Emnet Negash。梅克勒大学气候与社会研究所,埃塞俄比亚 Mek'ele 231。电子邮箱:emnet.negash@mu.edu.et
更新日期:2020-02-12
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