Calculation and Analysis of Degradation Ability under Different Hydrological Conditions in Poyang Lake

Abstract

According to the unique hydrological characteristics of "a flood in high water level, a line in low water level", Poyang lake is partitioned. Based on the hydrological datas, 2003, 2005 and 2010 are selected as typical years of dry year, average year and wet year respectively. The model of the pollutant degradation ability is selected to calculate the degradation coefficient during hydrological periods in typical years. The results show that the degradation ability of pollutants is greater in high water period than in normal water period. There was no obvious rule in the degradation ability because water level and flow velocity are random during low water period in different hydrological year. The degradation ability of river into the lake area is greater than in the north lake district during high and normal water period. The south lake district is the least. The degradation of pollutants depends on hydrological conditions. Physical degradation is main generally.