【摘要】 为增强瞬时单位线的适用性,提高流域洪水预报精度,本文在纳什瞬时单位线的基础上,充分考虑流域净雨强度和空间分布不均匀的非线性影响因素,提出时变瞬时单位线(TVIUH)模型.同时建立了综合目标函数确定模型参数,模型简单实用.通过观音阁-葠窝梯级水库的实例检验,证明该模型能较好地处理流域汇流的非线性影响因素,提高汇流预报精度,为水库的防洪调度能提供更为可靠的依据.更多还原

【Abstract】 In order to increase the applicability of instantaneous unit hydrograph and improve the precision of flood forecast,based on the Nash instantaneous unit hydrograph(IUH) theory,a new model of time-variable instantaneous unit hydrograph(TVIUH) is proposed in the paper.This model has taken into consideration of the influence of nonlinear factors,such as the density of net rainfall and the spatial non-uniform distribution in given basin.And the comprehensive objective function is established as well to optimize the related model parameters by means of a genetic algorithm.The model is very simple and applicable.The flood forecast computation of Guanyinge-Shenwo cascade reservoir has been carried out as an example by using the TVIUH model.The results show that the proposed model(TVIUH) can take good account for the nonlinear factors of the runoff flow in the basin and precisely forecast the flood.The research provides a reliable reference for flood control of reservoirs.更多还原