Study On Water Storage Of Storing-and-Detention Areas In North Tianjin For Flood-Water Resources Utilization

Tianjin is a city short of water resources, the period of flood seasons is less thantwo months and there is little water after these seasons. The previous method toprevent flood is leading the floodwater to the sea, it is sure that under this methodmany useful water resources were wasted and the problem of the ecologicalenvironment becomes more serious. Therefore, it has a great theoretical and alsopractical significance to make some study on the floodwater resources utilization.To achieve the harmony between the human being and the ecological environment,the approach to utilize floodwater is making good use of storing-and-detention areas.So far, there are some researches about floodwater resources utilization, however,most of them are on the concept. In this thesis, one dimensional river networkunsteady flow numerical model is used to simulate the north river network in Tianjin.Four rivers are calculated and the water storages of four storing-and-detention areasunder different flood conditions are analyzed. The problems of the economical losingresulted from storing water, the upstream inflow flood process, seawater intrusioncaused by downstream tide and the maximum water storage of the floodstoring-and-detention areas were considered.The calculation results indicate that it is beneficial to storage floodwater in thestoring-and-detention areas during flood seasons, and because of the limited volumeof the storing-and-detention areas, there is more water leaded to the sea when there ismore floodwater came from the upstream.