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Review on hydrological and hydrodynamic coupling models
for flood forecasting in mountains watershed

1 1 1 1 2
JIANG Chunbo ，ZHOU Qi ，SHEN Yanxia ，LIU Gaofei ，ZHANG Di
（1. State Key Laboratory of Hydroscience and Engineering，Department of Hydraulic Engineering，
Tsinghua University，Beijing 100084， China；
2. School of Hydraulic Engineering，Faculty of Infrastructure Engineering，Dalian University of Technology，Dalian 116024，China）

Abstract： Flood disasters occur frequently in mountainous watershed due to human activities and climate
change， and the development of flood prediction model has important theoretical significance and applica⁃
tion value for flood disaster management and water environment improvement. The advantages and disadvan⁃
tages of hydrological and hydrodynamic models for flood simulation and forecast were detailed in this pa⁃
per，respectively，and the shortcomings of single hydrological model or hydrodynamic model for flood simu⁃
lation and forecasting were proposed. Based on this， the characteristics and applicability of different cou⁃
pling models，such as series coupling of hydrological and hydrodynamic models，dynamic unidirectional cou⁃
pling of hydrological and 1D hydrodynamic models，and dynamic unidirectional coupling of hydrological and
2D hydrodynamic models， were summarized and compared， and it was concluded that these coupling mod⁃
els have made great progress in computational accuracy，computational efficiency and numerical scheme sta⁃
bility. The mutual feedback mechanism between hydrological process and hydrodynamic process were intro⁃
duced， and the feasibility of a new coupling model was also discussed. As a result， a dynamic bilateral
coupling model （DBCM） was established， which was expected to reflect the real flood routing process and
improve the simulation accuracy. In the future，not only the simulation accuracy of flood disaster should be
improved， but also the operation efficiency of models should be increased to achieve high-precision flood
simulation， which support for flood control and comprehensive improvement of water environment. In prac⁃
tice， according to the actual flood control situation of mountainous watershed and cities， the different cou⁃
pling model can be selected for flood simulation and forecast.
Keywords：flooding forecasting；watershed model；hydrology model；hydrodynamic model；coupling model

（责任编辑：李福田）

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