Study on the relationship between annual regulation reservoir capacity coefficient and regulation coefficient:a case study of Tangcun Reservoir
The relationship between the annual regulation reservoir capacity coefficient and the regulation coefficient is influenced by various factors,including inflow processes,water usage processes,and design assurance rates.Taking Tangcun Reservoir as an example,through calculations and analysis of the long time series of hydrological data at three dam sites.It was found that the reservoir's under annual regulation conditions,regulation coefficient gradually increased as the reservoir capacity coefficient increases,and the rate of increase decreased gradually.There was a power function relationship between the reservoir capacity coefficient and the regulation coefficient,with the reservoir capacity factor gradually increasing as the regulation factor increases,and the rate of increase gradually increasing.The reservoir storage index(multi-year average)also had a power function relationship with the reservoir capacity factor,and it gradually decreased as the reservoir capacity factor increases.These patterns of change are independent of the dam site and water usage function.When the dam site and reservoir capacity factor are the same,the regulation factor for water supply is greater than the regulation factor for irrigation.The research findings can be used as a reference for preliminary planning of new reservoirs and for the reevaluation of the water supply capacity of existing reservoirs.
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