Theory And Practice Of Safe Utilization Of Flood Resources

There is a co-existence between flood threatening and shortage of water resources in a river basin. It is an important approach to realize the safe utilization of flood resources by the adjustment and application of limited level of reservoir during flood season to solve the contradiction between flood control and water impoundment. Focusing on such several key issues of flood utilization as resources in a basin as potentiality of flood resources in a basin, seasonal variation principle of storm flood in a basin, stage quantitative description method during flood period, computational method of stage design flood and risk design of adjustment and application of limited level of reservoir during flood season, deepgoing study is conducted in this dissertation. Thus a theoretic system and technical framework to utilize limited level of reservoir during flood season are established to store flood as water resources.On the basis of overall review of theoretic researches and scientific practices of flood resources utilization both at home and abroad, the definition and connotation of flood resources are expounded in this paper. The utilization pattern and its realization approach are systematically put forward. The variation principles and evolution tendency of flood resources features in a basin under the joint function of human activities and natural factors are analyzed. The status quo and potentiality of flood resources utilization in a basin are quantitatively evaluated. Started from the research of basin storm and seasonal variation tendency of flood, the temporal and spatial distribution characteristics of storm flood are analyzed. Combined with analyses of weather system and meteorological genesis of atmospheric circulation condition which impact rainfall occurrence in a catchment, the seasonal variation tendency of storm flood in a basin are quantitatively put forward. Meanwhile, complemented by comprehensive comparison among many quantitative analytical methods, such as meteorological division method, fuzzy set analytical means, system assembling method, fractal method and Fisher optimal dissection method, etc., the rational division of flood seasonal period is probed. In regard to the sampling method of flood series in the stage design flood computation, the influence of AMS(annual maximum series) sampling, AES(annunl exceedance series) sampling, PDS (partial duration series) sampling, periodical and trans-periodical sampling on the parameter estimations and computation results of stage design flood is discussed with case studies of typical reservoirs. Based on the systematical analysis of main influential factors of limited level of reservoir during flood season, principles followed by the comprehensive analyses and argumentation of adjustment for limited level of reservoir during flood season is clarified in view of safe utilization of flood resources. Furthermore, the framework and quantitative analytical method of risk design and comprehensive analyses and argumentation are raised, andargumentation contents for reasonable adjustment of limited level of reservoir during flood season are intensively analyzed. Taken the Yuecheng Reservoir and Panjiakou Reservoir in the Hai River Basin as case studies, a rational adjustment scheme of limited level of reservoir during flood season is analyzed and tested from many aspects like design flood, flood forecast and pre-release, operation pattern of flood forecast, design standard of upstream and downstream flood control, upstream resettlement scope, risk and benefit of long-term reservoir simulation.