Analyzing the runoff response to soil and water conservation measures in a tropical humid Ethiopian highland
Analyzing the runoff response to soil and water conservation measures in a tropical humid Ethiopian highland
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DOI：
10.1080/02723646.2017.1302869
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发表时间：
2017-03
影响因子：
1.6
通讯作者：
Dagnenet Sultan;A. Tsunekawa;Nigussie Haregeweyn;E. Adgo;M. Tsubo;D. Meshesha;T. Masunaga;D. Aklog;Kindiye Ebabu
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作者：
Dagnenet Sultan;A. Tsunekawa;Nigussie Haregeweyn;E. Adgo;M. Tsubo;D. Meshesha;T. Masunaga;D. Aklog;Kindiye Ebabu
自20世纪80年代以来，埃塞俄比亚许多干旱易发地区实施了不同的水土保持措施。我们评估了SWC实践对径流响应的影响，并通过实验推导和测试了径流曲线数（CN）模型参数对埃塞俄比亚西北部Kasiry流域热带湿润高原气候的有效性。我们记录了18个径流样地（30米长× 6米宽）的日降雨量和径流深度，这些样地代表了五种主要的土地利用类型，采用不同的SWC做法和两种坡度（平缓和陡峭）。CN值采用对数正态几何平均CN程序推导。采用SWC措施的地块的径流量显著减少，耕地和非农业用地的径流量分别平均减少44%和65%。使用衍生的CN方法对代表非农业用地的地块的径流进行了相对准确的预测，但对采用SWC方法处理的地块的预测准确性较低。我们的结论是，预测SWC实践对径流的影响需要对每个SWC实践使用单独的CN值集进行参数化。
Abstract Different soil and water conservation (SWC) practices have been implemented in many drought-prone parts of Ethiopia since the 1980s. We assessed the effect of SWC practices on runoff response and experimentally derived and tested the validity of the runoff curve number (CN) model parameter for the tropical humid highland climate of the Kasiry watershed in northwestern Ethiopia. We recorded daily rainfall and runoff depth from 18 runoff plots (30 m long × 6 m wide) representing the five main land-use types with various SWC practices and two slope classes (gentle and steep). CN values were derived using the lognormal geometric mean CN procedure. Runoff was significantly less from plots with SWC measures, with average reductions of 44 and 65% observed in cultivated and non-agricultural lands, respectively. Runoff on plots representing non-agricultural land was relatively accurately predicted with the derived CN method, but predictions were less accurate for plots treated with a SWC practice. We conclude that predicting the effect of SWC practices on runoff requires parameterization with separate sets of CN value for each SWC practice.