Identification and mapping of surface irrigation potential in the data-scarce Jewuha watershed, Middle Awash River Basin, Ethiopia

IF 2.6 4区环境科学与生态学 Q2 WATER RESOURCES

Hydrology Research Pub Date : 2023-10-12 DOI:10.2166/nh.2023.082

Manamno Beza Dinku, Habtamu Hailu Kebede

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Abstract

Abstract This study was conducted to identify and map the surface irrigation potential in the data-scarce Jewuha watershed of the Awash Basin, Ethiopia. The suitability of the land, based on the soil characteristics and slope, was first assessed by the parametric evaluation technique. The overall suitability of the land was then evaluated considering additional factors including land use land cover, proximity to a water source and road using weighted overlay analysis through the analytic hierarchical process (AHP). Water diversion sites as the source of water supply points were selected based on theoretical site selection criteria with the help of a geographic information system (GIS) and physical observation. The surface water available at the diversion sites was estimated using the Soil and Water Assessment Tool (SWAT) model combined with the spatial proximity regionalization technique. The land suitability analysis revealed that 16.7% (11,359 ha) of the study area is suitable for surface irrigation. Five diversion sites were identified as sources of water supply and the total flows at these sites were 12.92 Mm3. It was found that only 27.3% (3,098 ha) of the suitable land, 5% of the total area of the watershed, can be effectively developed by surface irrigation.

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埃塞俄比亚中阿瓦什河流域数据匮乏的Jewuha流域地表灌溉潜力的识别和制图

本研究旨在确定和绘制埃塞俄比亚阿瓦什盆地Jewuha流域数据稀缺的地表灌溉潜力。首先根据土壤特征和坡度，采用参数化评价技术对土地适宜性进行评价。然后，通过层次分析法(AHP)，利用加权叠加分析法，综合考虑土地利用、土地覆盖、靠近水源和道路等附加因素，对土地的整体适宜性进行了评估。在地理信息系统(GIS)和物理观测的帮助下，根据理论选址标准选择引水点作为供水点的水源。采用水土评价工具(SWAT)模型，结合空间邻近区划技术，估算了引水区的可利用地表水。土地适宜性分析表明，研究区16.7% (11359 ha)的土地适宜进行地表灌溉。确定了5个引水点作为供水水源，这些引水点的总流量为12.92 Mm3。结果表明，仅27.3%(3098公顷)的适宜耕地可通过地表灌溉得到有效开发，占流域总面积的5%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Hydrology Research WATER RESOURCES-

CiteScore

5.00

自引率

7.40%

发文量

审稿时长

3.8 months

期刊介绍： Hydrology Research provides international coverage on all aspects of hydrology in its widest sense, and welcomes the submission of papers from across the subject. While emphasis is placed on studies of the hydrological cycle, the Journal also covers the physics and chemistry of water. Hydrology Research is intended to be a link between basic hydrological research and the practical application of scientific results within the broad field of water management.