The Hydraulic Model Research And Application Of River Network In Taizhou Area Of Soil With High-content Sands

With the development of urbanization and global warming,the urban areas have been more and more torrential rain,and the urban rainstorm has been outstanding.The city of TaiZhou is suffering from floods and floods.In order to improve the drainage capacity of the area,This paper carried out the research on the comprehensive remediation planning of the river network.The results of the study have direct significance to the urban drainage planning in TaiZhou city.Based on the Saint-Venant system,this paper establishes a mathematical model for the non-constant flow of river network in TaiZhou city.The time and space of the system are separated by Preissmann four-point weighted implicit difference scheme.And the double relaxation iterative method is used to solve the non-constant flow of the river network.The runoff of the study area is calculated and the ground runoff is obtained.Based on the measured data,the mathematical model is determined and verified.After the actual rainfall verification,the absolute error of water level of typical nodes in the river network is basically within ±0.05.It is shown that the mathematical model of this paper has the ability to simulate the flow movement of complex river network.This paper use the hydraulic model of the river network in taizhou city that have rate to simulate the current flow of river network under different frequency rainstorm and tide level combination.This paper makes a comprehensive remediation planning study on the current river network from the river channel improvement,the excavation of the lake pond,the construction of new gate entrance three angles.It obtained five planning schemes to meet the drainage requirements by using this mathematical model to simulate the flow of the river network.The first plan is the backbone-channel improvement.The second plan is the excavation of lakes.The third plan is the the backbone channel and the secondary channel improvement.The fourth plan is the backbone-channel improvement with the excavation of lakes.The last plan is the backbone-channel improvement with the construction of new gate.Based on the project cost and waterlogging effect,the five schemes are analyzed and compared.The first plan costs about 1.77 billion yuan and its waterlogging effect is 0.50m.The second plan costs about 2.27 billion yuan and its waterlogging effect is 1.36m.The third plan costs about 2.87 billion and its waterlogging effect is 0.92m.The fourth plan costs about 1.85 billion and its waterlogging effect is 0.98m.The first plan costs about 1.77 billion and its waterlogging effect is 1.57m.The research shows that plan 5 that is the backbone-channel improvement with the construction of new gate is a low cost,waterlogging effect good optimization plan.