水土保持措施减水减沙效果分离评估研究

Study on Separated Evaluation or Water and Sediment Reduction Benefits Through Soil Conservation Measures

根据耦合模拟概念性模型理论，把流域水流泥沙耦合模型应用于水土保持措施减水减沙效果评估之中。首先把各类措施划分为减水型（或蓄水拦泥型）和植被型，然后利用模型对这两种类型措施引起的减水、减沙效果及总的减水减沙效果分离评估。通过对黑矾沟流域水土保持措施效果进行评估，其结果表明，该方法较合理，分高评估的各项结果也较符合实际情况。其中，计算的次洪产流量和产沙模数与实测值对比，其总绝对误差的相对值分别为２０．１％和２０．４％。

According to the theory of conceptural model of coupled simulation.the paper applies thecoupled model of runoff and sediment of a basin into the evaluation of water and sediment reduction benefits through soil conservation measures. First of all,It devides various measures intotype of water reduction (or type of storing water and retaining sediment) and type of vegetation.then use the model to evaluate separately the benefits of water and sediment reduction caused byusing the two kinds of measures and the total benefits of water and sediment reduction. It isshown through the evaluation of benefits of soil conservation measures used in Heifangou watershed that the method is rational and each result of separated evaluation tallies with the actual situation. Comparing the observed value with the calculated individual flood yield and sediment production modulus, the relative value of the total absolute error is 20. l% and 20. 4% respectively.