Alterational correlation analysis between the water level and the influencing factors of Hukou Station at Poyang Lake

Abstract

Poyang Lake plays a restricts and interacts role with Yangtze River, the key node of water resources connection between them is Hukou Station. The water level of Hukou Station reflects the inflow, precipitation, evaporation of Poyang Lake Basin and the backflow of the main stream of Yangtze River. Influenced by the climate change and human activities, the water level of Hukou Station appears of the inconsistency characeteristics obviously, which induced abnormally low water level, ecological degradation of beach wetlands, and dramatic reduction of water storage capacity in Poyang Lake. In order to analyze the alterational correlation be between the water level and the influencing factors of hukou station, and finding out the highest correlation factor, the Hydrological Alteration Diagnosis System was used to diagnose the alteration of water level of Hukou Station and the influencing factors. The results show that, the water level of Hukou station experienced a moderate alteration in a leap-down manner in 2003, and the mean value of the water level decreased 0.8m after the hydrological alteration; the influencing factors experienced different hydrological alteration with different form, tha main alteration form is jump alteration, and there is no trend alteration happened in all the series; the alterational correlation between the water level of Hukou Station and Jiujiang Station is the highest, which means the mainstream flow of Yangtze River plays the most important role at the hydrological alteration of the water level of Hukou Station. The alterational correlation has a certain indicative role in analyzing the inconsistency evolution characteristics of Poyang Lake.