论文部分内容阅读
地表径流是引起土壤侵蚀的主要动力,控制水土流失和提高降水资源利用效率是半干旱区农业可持续发展的关键因素。本研究利用沟垄微型集雨径流场实测径流资料,基于SCS-CN模型,结合下垫面、降雨量等信息,分析模型参数(径流曲线数CN和初损系数λ)的敏感性,测定不同沟垄比和不同覆盖材料对模型参数的影响,提出适合沟垄微型集雨系统产流计算的参数值,并对其进行模拟验证及有效性分析。结果表明,初损系数λ是影响模型模拟的主要因子,试验沟垄比对模型参数率定的影响较小;该模型所模拟的径流量与实测径流量具有较好的一致性,土垄、普通塑料膜垄和生物可降解膜垄的有效性系数分别为0.864、0.988和0.947,说明模型在参数的确定上较为合理,可应用于沟垄微型集雨系统降雨径流的预测,为半干旱区控制水土流失和提高降水资源利用效率提供科学方法。
Surface runoff is the main driving force of soil erosion. Controlling soil erosion and increasing utilization efficiency of precipitation resources are the key factors for sustainable agricultural development in semi-arid areas. In this study, the runoff data from the runoff of the ridge and ridge micro-catchment were used to analyze the sensitivity of the model parameters (runoff curve number CN and loss factor λ) based on the SCS-CN model, the underlying surface and rainfall. Ridge-to-ridge ratio and different covering materials on the parameters of the model, the parameter values of runoff calculation for furrow-ridge micro-type rainwater collection system are proposed, and the simulation verification and validity analysis are carried out. The results show that the initial loss coefficient λ is the main factor affecting the model simulation. The experimental furrow-to-ridge ratio has less influence on the model parameter calibration. The runoff simulated by this model is in good agreement with the measured runoff. The effective coefficients of ordinary plastic film ridge and biodegradable film ridge are 0.864,0.988 and 0.947, respectively. It shows that the model is more reasonable in determining the parameters and can be applied to the prediction of rainfall runoff in the micrrennial rainwater harvesting system, which is the semi-arid area Control of soil and water loss and improve the efficiency of precipitation resources to provide a scientific method.