SCS模型在干热河谷区坡面产流模拟中的应用

 为探索干热河谷泥石流多发地区的降雨产流机制,选择地处云南省东北部干热河谷区的蒋家沟流域,利用径流小区野外双环下渗试验的结果,确定径流小区中各土壤水文类型,根据蒋家沟实际情况,用前期影响雨量代替前5d降雨总量来确定各径流场中土壤的前期湿润程度,然后利用实际观测的5次降雨—径流资料,运用SCS模型对5个不同土地利用类型的径流小区进行降雨产流模拟,通过校正初损Ia和CN参数,得到模拟结果。结果表明,与实测资料相对比,各次降雨中模拟的径流量与实测值的误差平均值分别为4.32%,5.30%,9.59%,7.99%,5.26%,可信度较高,说明SCS模型可以应用于干热河谷区坡面降雨产流的估算,研究成果可为该地区降雨—径流模型提供参考。

Application of SCS model on simulation of the slope-runoff process in dry-hot valley

To study the rainfall-runoff mechanism in debris flow valley in dry-hot area,the experiments were carried out on red-yellow soil,which is the main type in dry-hot valley in northern Yunnan province.This paper identified the soil hydrological types of each runoff plot by outdoor infiltration experiment,classified the AMC（Antecedent Moisture Class） by antecedent impaction precipitation in the last five days instead of total precipitation,calculated the volume of surface runoff during 5 rainfalls in 2006 on 5 different kinds of land use types by SCS（Soil Conservation Service） model.The result is acceptable through calibrating Ia and CN,The average error during each rainfall is respecrtively 4.32%,4.32%,9.73%,7.28%,6.24%.The result shows that the feasibility of the application of SCS model to estimate the volume of rainfall runoff in sloping field in dry-hot valley,and also provides a reference to study the rainfall-runoff model in this district.