一维-二维耦合的河湖系统整体水动力模型

1D-2D coupled hydrodynamic simulation model of river-lake system

为对自然界中的复杂水流系统进行整体水动力数值模拟,建立了适用于河湖系统的一维-二维耦合模型。将河网计算中用于处理河段间耦合的汊点水位预测校正法应用到一维-二维耦合边界的处理中,即耦合边界水位预测校正法。该方法具有一维、二维模型计算完全独立,可有效利用现有模型的优点。与传统一维-二维耦合处理方法相比,耦合连接条件的满足程度较高且可通过对计算容差的调整进行有效控制。利用理想及实际例子进行了计算验证,结果表明该方法具有较好的实用性。

A coupled 1D-2D numerical model for simultaneous hydrodynamic simulation of river-lake systems is presented.The Water Stage Prediction-Correction（WSPC） method,which is originally proposed to treat the inter-reach coupling at junctions in river-network hydrodynamic calculation,is adopted herein to treat the inter-model connection conditions between 1D and 2D models at the coupled boundaries.Under the WSPC framework,the execution processes of 1D and 2D models during each time step are totally independent,implying that we can make use of the existing model at a minimum modification.Compared to traditional decoupling techniques,the WSPC method gives the advantage of fully fulfilled inter-model connection conditions,whose accuracy also may be controlled by tuning the numeric tolerance.The proposed model is verified by hypothetical and practical cases,and the results show its reliability and good prospects in application.