一种基于下垫面变化的产汇流模型及其应用

为土地利用变化较大的流域构建产汇流模型时,下垫面的变化是一个极其重要的因素。利用中国科学院土地资源分类系统将流域分为不同的下垫面类型,在每一种下垫面上分别考虑蒸发和下渗要素的影响,运用超渗-蓄满耦合产流模式进行产流计算,并采用单位线汇流和线性水库模型演算至流域出口断面,从而构建了基于下垫面变化的产汇流模型。在模型率定和验证时,对大清河水系紫荆关流域的洪水序列作频率分析,以不同重现期的洪水序列分别对模型进行率定和验证。从模拟结果来看,模型结构基本反映了流域产汇流的各个环节,模拟结果能够满足研究精度要求。

Application of runoff yield and concentration model based on underlying surface change

When building a runoff model based on the basin in which land-use changes are more,underlying surface change is an extremely important factor.By using the land resources classification system of Chinese Academy to divide the basin into some different land use types,consider separately the effects of evaporation and infiltration in every kind of underlying surface area,applying the runoff model coupling of infiltration-excess and saturation-excess runoff to do runoff calculations,using unit hydrograph and linear reservoir model to do the convergence calculations,thus runoff model based on underlying surface change was constructed.A frequency analysis was done for flood sequences of Zijingguan basin,before the model was calibrated and validated with flood sequences of different return periods.As a result of the simulation,the model structure basically reflected all aspects of runoff yield and concentration in the basin,simulation results can satisfy the required precision.