Variation analysis method for flood process homogeneity based on the information entropy: Taking the flood series of Longchun station in Dongjiang River basin as an example
Variation analysis method for flood process homogeneity based on the information entropy has been proposed in this paper in order to investigate whether the morphological characteristics of the flood hydrograph vary with the environmental changes. Firstly,this method uses the information entropy to construct flood process homogeneity model,and then adopts the hydrologic variation diagnosis system to analyze the variation rule of the flood process homogeneity series,and finally analyzes the variation explore the physical origin. Taking the flood series of Longchuan station in Dongjiang river basin as an example,the results of the calculation show that the flood process homogeneity series of Longchuan station in Dongjiang river basin have a strong hop mutation in 1972 and its mean value has increased after variation point,indicating the flood process has been more even;and the variation is ascribed to the changes of watershed land surface which is mainly caused by human activities in particular the construction and operation of Maple Dam Reservoir,while the climate change has no significant effect on it.