ZHANG Qiu-xia, WANG Fang, CHEN Min-jian (China Institute of Water Resources and Hydropower Research, State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, Beijing 100038, China)

Abstract: With the wetland formed by the subsidence area due to coal mining in the Xiao Sui Xin river basin of Huaibei city as research subject, this study analyzed the evolutionary tendency of the hydrological process of the wetland, considering the climate change, coal mining and change in the underlying surface of the river basin. Affected by the climate change, the precipitation has a tendency to increase with a change rate of 1.8mm per year, whereas the evaporation demonstrates a tendency to decrease. The decreasing tendency of the evaporation was significant before the 1990s with a change rate of 5.3mm per year, but insignificant after the 1990s with a change rate of only 0.47mm per year. With the impact of the increase in the areas of urbanization and subsidence, the water volume concentrated in the subsidence area will increase by 5 300 000m 3 per year after the subsidence becomes stable. Affected by the completion of the coal mining, the water volume of 10 million m 3 provided by drying the coal will disappear after the subsidence becomes stable. The study reached the conclusion that the water resources in the wetland will decrease by 4 620 000m 3 after the subsidence becomes stable. The results of the study provide important information for the rehabilitation of the wetland.

Key words: Huaibei; coal mine areas; wetlands; hydrological process; hydrological evolution

Published in: Journal of China Institute of Water Resources and Hydropower Research (Vol. 10 No. 1 March. 2012)