Analysis of Runoff Characteristics in Dry Season at Datong Station on the Mainstream of the Yangtze River

Abstract

As an important control station for the mainstream of the lower reaches of the Yangtze River, studing the runoff change characteristics in dry season at Datong Hydrological Stations can provide a comprehensive grasp of the hydrological conditions in the lower reaches of the Yangtze River. This study uses linear trend method, Mann-Kendall method and wavelet analysis method to analyze the dry season runoff change characteristics at Datong Station, and the following conclusions are obtained: the average flow in the dry season at Datong Station has shown a significant increasing trend and a significant change period, while the first main period is 35-year; for the typical dry months, there is no significant increasing trend in December, but the increasing trend is significant in January and February; The dry season runoff at Datong Station accounted for a significant increase in the proportion of the entire year since 2003.