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首页> 外文期刊>International Journal of Agricultural and Biological Engineering >Parameter evaluation for soil erosion estimation on small watersheds using SWAT model
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Parameter evaluation for soil erosion estimation on small watersheds using SWAT model

机译：基于SWAT模型的小流域水土流失估算参数评价。

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This research was undertaken for the evaluation of soil erosion using the semi-distributed basin scale SWAT model for four subcatchments of the Dhrabi River Catchment (DRC), which is located in the Pothwar Plateau region. Two subcatchments (catchment-25 and -31) are characterized by gullies while the other two (catchment-27 and -32) are managed with terraced landuse system. The performance of the model was satisfactory with coefficient of determination (R2) = 0.67 to 0.91 and Nash-Sutcliffe efficiency (ENS) = 0.54 to 0.85 for both surface runoff and sediment yield during the calibration (2009- 2010) and validation (2011) periods. The PUSLE factor was found to be the most sensitive parameter during model calibration. It was observed that all of the rainfall- runoff events occurred during the monsoon season (June to September). The estimated annual sediment loss ranged from 2.6 t/hm2 to 31.1 t/hm2 over the duration of the simulation period for the non-terraced catchments, in response to annual precipitation amounts that were between 194.8 mm to 579.3 mm. In contrast, the predicted annual sediment levels for the terraced catchments ranged from 0.52 t/hm2 to 10.10 t/hm2 due to similar precipitation amounts. The terraced catchments resulted in 4 to 5 times lower sediment yield as compared to non-terraced catchments. The results suggest that there is a huge potential for terraces to reduce soil erosion in the DRC specifically and Pothwar area generally, which have proven to be an efficient approach to establishing soil and water conservation structures in this region.
机译：这项研究是使用半分布式盆地规模SWAT模型对位于Pothwar高原地区的Dhrabi河集水区（DRC）的四个子集水区进行的土壤侵蚀评估。两个子汇水区（汇水区25和-31）的特点是沟壑，而其他两个汇水区（汇水区27和-32）则通过梯田土地利用系统进行管理。该模型的性能令人满意，在校准（2009-2010年）和验证（2011年）期间，地表径流和沉积物产量的测定系数（R2）= 0.67至0.91，纳什-苏克利夫效率（ENS）= 0.54至0.85期。在模型校准期间，发现PUSLE因子是最敏感的参数。据观察，所有降雨径流事件都发生在季风季节（6月至9月）。在非梯田流域的模拟期间，由于年降水量介于194.8毫米至579.3毫米之间，估计的年沉积物损失范围从2.6 t / hm2至31.1 t / hm2。相反，由于相似的降水量，梯田集水区的预计年沉积物水平在0.52 t / hm2至10.10 t / hm2之间。与非梯形集水区相比，梯形集水区的泥沙产量降低了4至5倍。结果表明，梯田在减少刚果（金）特别是Pothwar地区的土壤侵蚀方面具有巨大潜力，已被证明是在该地区建立水土保持结构的有效方法。

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