Research On Water Quantity Regulation Based On The Utilization Of Rain Flood Resource In The Tuhai River Basin

Water is the source of life, the essential of production, and the foundation of ecology. Precipitation distribution is uneven in interannual, years, and space, which causes the difficulties for taking full advantage of water resource in Tuhai River Basin. In order to manage excess water, and alleviate contradiction between supply and demand of water resources quantity, regulation control of water volume should be taken imminently. Large and medium-sized reservoirs are absent, which play a role in regulating water volume. However, multiple sluice gates established cross the Tuhai River provide a good infrastructure for regulating water volume. Water regulation mechanism is realized through the operation of the control for such scheduling wet dry, make sure that the rain flood resources utilization, provide theoretical foundation and reference basis for water gates scheduling. Specific contents are as follows:(1) Characteristics of rain and flood water, and the feasibility of flood resources utilization were analyzed in Tuhai River Basin. At the same time, typical hydrologic years were selected, whose ensurance probability of precipition were 5, 10, and 20 percent. Meanwhile, Nanliuqiao gate and Yingzi gate are as the dividing lines, devided Tuhai River into upstream, midstream and downstream.(2) Analyze the relation between supply and demand in Tuhai River Basin. Water resources mainly include surface water, groundwater and the Yellow River water. Water demand mainly includes the life water demand, the agricultural water demand, industry water demand, ecological and environmental water demand. Results indicated the basin belonged to the serious shortage of water resource, and imbalance between supply and demand is serious.(3) Water control model was established using MIKE11 software, and the parameters of hydrodynamic model(HD) and rainfall runoff model(NAM) were confirmed. And then, couple this two models to simulate the rain flood process. The study designed three scheduling models: gates fully open, water level control andwater level difference control. Based on scheduling rules of different gates and hydrologic typical years, numerical simulation of typical working conditions were conducted to realize the visualization of the process of water level and flow.(4) Based on the output value of water level and flow simulated by MIKE11 and initial storage capacity and other indicators, discharge and water volume of regulation control were calculated. Results showed that more rain flood water could be stored in the river by running the multiple gates. Peak storage capacity and storage capacity after flood season followed the same pattern: the storage capacity by dispatching of water level control was more than it by running of water level difference control, and the later was more it by running gates fully open.(5) In order to realize the gates valley sites for dispatching automation, and improve the utilization efficiency of rain flood resources, suggestions were given on management and regulation of gates in Tuhai River Basin.