Analysis of Precipitation-Complexity Distribution in Changing Environment in Liu-Kuang zone of Qingzhang River.China

摘要

The frequency and time of precipitation can influence the storage, allocation and management of water resources. But the precipitation frequency becomes more random and the precipitation process becomes more complexity due to the climate change and human activities, which increases the difficulty of technology and management. In this research, the fractal dimension based on Continuous Wavelet Transform (CWT) as the index of the precipitation complexity is applied to describe the precipitation process;;using it, the complexity distributions of different precipitation processes in Liu-Kuang zone of Qingzhang basin China in different periods is illuminated respectively. The result indicates that in research region: (1) the annual precipitation frequency in the late period is less than that in the early period;;(2) the urbanization and human activities increase the precipitation frequency. This result can reflect the frequency change of precipitation in changing environment and provide reference for the decision-making of water resources management in the local basin.