Abstract
Based on the hydrological data of Daicunba Hydrological Station of Dawen River from 1966 to 2017 and the meteorological data of surrounding stations, this paper analyzes the characteristics of the interannual variation of rainfall and runoff in the basin, and discusses the effects of rainfall and human activities on runoff. The results show that: (1) Rainfall and runoff in the Dawen River Basin showed an insignificant upward trend, with rising rates of 0.9541mm/a and 0.5398mm/a respectively; (2) Rainfall has a cycle of 4, 7, and 22 years, of which 22 The annual cycle is the main cycle, and the runoff has a cycle of 5, 7, 18, and 22 years, of which 22 years are the main cycle, and the main cycle of rainfall and runoff is consistent; the rainfall mutation point occurred in 1997 and 2002, and the runoff mutation point occurred in In 2002, the runoff had a significant increase trend after the sudden change; (3) According to the sudden change point of the runoff, the study area was divided into the base period (1966-2002) and the change period (2003-2017), so as to obtain the change of human activities on the runoff. The contribution rate is 60.6%, and the contribution rate of rainfall to runoff is 39.4%, indicating that the runoff of the Dawen River Basin is mainly affected by human activities.
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