分布式单位线在河北雨洪模型中的应用

摘要

The procedure of flow confluence computation is difficult to be used for ungauged catchments because the flow confluence parameters are hard to obtain.In view of this,we applied spatially distributed unit hydrograph based on digital elevation model to the rainfall-flood model of Hebei province,and simulated four big floods in Yu-menkou catchment.The application results show that the relative errors of flow rate of all flood peak are smaller than 5%,the error of peak time less than 2h and the effective coefficient larger than 0.85.The simulated results are in good consistency with the observed flood hydrographs.By combing spatially distributed unit hydrograph with the rainfall-flood model,we could solve the problem of flood early-warning in ungauged catchments,especially mid-dle and small catchments in hilly areas.%因河北雨洪模型的汇流计算方法难以用于无资料流域，其汇流参数难以获得且不宜移用，为此，将基于数字高程模型的分布式单位线用于河北雨洪模型，并对峪门口流域4场较大洪水过程进行了模拟。结果表明：4场洪水洪峰流量相对误差均＜5％，峰现时间误差均＜2 h，确定性系数均＞0．85，模拟效果令人满意。河北雨洪模型与基于流域地形地貌特征的分布式单位线相结合，可解决无资料流域，特别是山丘地区中小流域的洪灾预警预报等问题。