Hydrological variations and attribution analysis of Poyang Lake and Dongting Lake in the past 30 years
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Abstract:
Poyang Lake and Dongting Lake are currently one of the few large and natural river systems in China that play an irreplaceable role in regulating the flood and maintaining the ecological environment of the Yangtze River Basin. In recent years, due to the superimposed influence of climate change and large-scale water conservancy projects, the change of the hydrological situation of the two lakes has gained considerable attention. Therefore, it is o f great practical significance to reveal the hydrological characteristics of the two lakes and comprehensively analyze the influencing factors for the in-depth understanding of the lake water resource management and the relationship between the rivers and lakes. Taking the water systems of Dongting Lake and Poyang Lake as the research objects, the Mann-Kendall test is used to study the trend and degree of lake water regime evolution through the water level of the two lakes, the runoff of the Yangtze River and the runoff of the two lakes in the past 30 years. Moreover, the overall variation characteristics of hydro logical variables in both lakes and their causes at different periods in 198522014 are analyzed. Through the comparison of the hy drological conditions in both lakes, the law of hydrological variation and its influencing factors in the river-connected lakes in the middle reaches of the Yangtze River are systematically examined.The results show that the water levels of the two lakes in the past 30 years have generally been in three stages of " rising-un steady-declining " . Before 2003, the water levels of Poyang Lake and Dongting Lake generally showed an upward trend, and they are basically in an unstable fluctuation state from 1980 to 20 00. After 2 003, the water level of the two lakes showed an obvious downw ard trend. Mann Kendall analysis showed that the water level of the two lakes may have a significant mutation around 2005, and the m aximum drop of the water level of Po yang Lake and Dong ting Lake is 9. 4% and 3. 4% , respectively, compared with the previous one, indicating that the trend degree of water level change of the two lakes is different, and the sensitivity degree o f water regime change of Po yang Lake is stronger than that of Dongting Lake. The replenishment period of Dongting Lake for the mainstream of the Y ang tze River is from April to October, and for P o yang Lake is from March to August, indicating that the two lakes have different adjustments and compensation effect son the hydrology of the mainstream of the Yangtze River.
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