Numerical Simulation Analysis Of Influence Of Comprehensive River Control Measures On Water Level Of Main Stream Of Hongze Lake And Huai River

The Huai River Basin is located in the eastern part of China,and has a very important strategic position.Historically,the Yellow River seized the Huai River and formed the Hongze Lake.As a storage reservoir to carry floods from the main stream of the Huai River,it has an inseparable relationship with the floods in the middle and lower reaches of the Huai River.The current prominent problems in the Huai River Basin are mainly the following three aspects: the inadequate discharge scale of Hongze Lake;the inflow of the river reaches an inverse proportion,which leads to the obvious "supporting" effect of Hongze Lake;Therefore,how to solve the above problems and what river management measures are taken to reduce the water levels of the Hongze Lake and the main stream of the Huai River has become the primary task for the Huai River.This paper builds a complex hydrodynamic model of the Huai River and Hongze Lake based on mathematical model methods,and studies the effects of integrated river management measures on the water levels of the Hongze Lake and Huai river.The main research results are as follows:(1)The trend analysis,periodic analysis and forecast research of the measured rainfall runoff data show that the rainfall generally decreases first and then increases,and is in a period of high climate variability;the runoff is decreasing,but changes The trend is not obvious.The rainfall forecasting research based on the average function prediction model shows that the forecasting results can grasp the fluctuations of the original rainfall series and have certain reference value.The research based on the measured data provided data parameter support for the establishment of the next hydrodynamic model.(2)Establish a one-dimensional and two-dimensional coupled hydrodynamic mathematical model for the section from the Wujiadu to Hongze Lake exit of the main stream of the Huai River.The model is calibrated and verified based on the measured data.The results show that the simulation results fit well with the actual data.Computing provides a reliable computing platform and lays the foundation for research.(3)Using one-and two-dimensional coupled hydrodynamic models to analyze the effects of the main flood discharge pathways of the Hongze Lake,that is,the inflow of the inflow channel and the inflow channel,on the water levels along the main stream of the Hongze Lake and the Huai River,the results show that The discharge capacity enables it to reach the design flood flow,which can reduce the water level at various locations in the Hongze Lake area,and at the same time,the water level decline from the downstream to the upstream of the Huai River gradually decreases.In particular,the analysis of the effect of the proposed channel treatment measures for the second stage of the seawater channel on the water level in the Huai River Basin,and the results show that the second stage of the seawater channel can be used to expand the discharge capacity of the Hongze Lake flood discharge outlet and affect the water level in the lake area.It is relatively large,which can reduce the water level along the main stream of the Huai River to varying degrees.(4)Analyze the impact of the two river management measures of Feng Tieying river diversion and river dredging on flood disasters in the middle and lower reaches of the Huai River.By exploring the comprehensive management measures of different river channels,we will strive to achieve “a flood of 100 years below Bengbu without the use of flood areas,The goal is to reduce the position by 2m”.The results show that the excavation of the Feng Tieying river can speed up the flood discharge and have a significant effect on lowering the water level along the middle reaches of the Huai River.The river dredging schemes of different scales have lowered the water level along the main stream of the Huai River.Through the combination of the second phase of the seawater channel project,the excavation of the Feng Tieying river diversion,and the dredging of the entire river channel,it was concluded that under the combined action of the three river management measures,it is possible to achieve “a flood of 100 years below Bengbu without the use of flood areas,The goal is to reduce the position by 2m”.