Application of mathematical model of 1-D river network coupled with 2-D horizontal flood routing

We establish a mathematical model of 1-D river network coupled with 2-D horizontal flood routing,which has been applied in simulation of flood dispatching scheme of Luoshan-Hankou reach of the main stem of Yangtze River and Dongjing River system,a tributary of Hanjiang River.The variation of water levels in flood diversion polder areas of Dongjing River and Dujiatai flood diversion area after implementation of flood diversion has been simulated,so has the process of routing and inundation in all the flood diversion areas.The results show that the water levels of the flood diversion gate near the sluice and downstream can be lowered by flood diversion evidently;however,the upstream water level is hardly influenced.Meanwhile,the calculation results indicate that the model is reliable,convenient,and stable and is consistent with the practical process.