基于径流系数的流域产流模型建立及检验

摘要

Based on the analysis of relation between rainfall and runoff, this study built a watershed runoff yield model based on runoff coefficient and determined the calculation formula of runoff coefficient. The model was applied in forecasting the runoff at the Dongwan station in the Yihe River Basin, Guanzhai station in the Shayinghe River Basin and Nianyushan station in the Guanhe River Basin. The results show that the forecasts in the 3 basins have met the eligibility requirements.%降雨径流关系因其原理简单实用在实际洪水预报中应用广泛，但一直以来是经验推算。在阐述降雨径流关系的基础上，构建了基于径流系数的流域产流模型，并确定了径流系数的计算公式。将该模型应用在伊河流域的东湾站、沙颍河流域的官寨站以及灌河鲇鱼山站等控制流域的径流预报中，结果表明，模型在3个流域的预报合格率均达到了乙级以上作业预报要求。该模型简单实用，计算步骤可行，并易于程序化，可进一步推广应用。