Runoff and Sediment Yield Modeling of Meki River Watershed Using SWAT Model in Rift Valley Lakes Basin, Ethiopia

American Journal of Civil Engineering Pub Date : 2021-10-28 DOI:10.11648/J.AJCE.20210905.12

Aman Bunta, B. Abate

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引用次数: 1

Abstract

Loss of soil fertility in agricultural lands and sedimentation in lakes of central rift valley of Ethiopia are major watershed problem threatening the agro economy in the area. To develop effective erosion control plans through implementing appropriate soil conservation practices, runoff and sediment yield in Meki watershed was estimated and analyzed using the SWAT model. The model showed the simulated mean annual surface runoff was 114.03mm and the mean annual streamflow was 9.41m3/s. Similarly, mean annual sediment load of 13.12 t/ha enters to Lake Ziway. The model was calibrated and validated on daily and monthly time step for flow and on monthly time step for sediment yield. The results of Nash Sutcliff Efficiency of 0.71 on daily and 0.89 on monthly time steps for streamflow and its value of 0.80 on monthly time step for sediment yield during calibration showed that there is a good match between measured and simulated data for both variables on daily basis and very good match on monthly basis. The potential erosion source areas were identified. Likewise, 51.34% of the watershed area was found to be potential erosion sources and priorized for erosion control plans.

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基于SWAT模型的东非大裂谷湖泊流域Meki河径流产沙模拟

埃塞俄比亚中部裂谷农业用地土壤肥力丧失和湖泊淤积是威胁该地区农业经济的主要流域问题。为了通过实施适当的水土保持措施制定有效的侵蚀控制计划，使用SWAT模型估算和分析了Meki流域的径流和泥沙产量。模型模拟的年平均地表径流量为114.03mm，年平均径流量为9.41m3/s。同样，年平均输沙量为13.12 t/ha，进入Ziway湖。对模型进行了日、月时间步长流量和月时间步长产沙量的标定和验证。在标定过程中，径流的日时间步长为0.71，月时间步长为0.89，产沙量的月时间步长为0.80，表明两个变量的日观测数据与模拟数据吻合较好，月数据吻合较好。确定了潜在侵蚀源区。同样，51.34%的流域被发现为潜在侵蚀源，并优先进行侵蚀控制计划。

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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American Journal of Civil Engineering

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