Surface Water Hydrology
In recent years, under the influence of climate change and human activities in Lancang River basin, the water level in the lower reaches of Lancang River presents an inconsistent feature which effects the flood and drought controlling, navigation and ecological protection directly. In order to reveal the regulation of multi-scale water level series variation on temporal and spatial scales, different time-scale mean water level series and extreme water level series of Jiuzhou, Jiajiu and Yunjinghong stations in the lower reaches of Lancang River are analyzed with hydrological variation diagnosis system (HDVS), which is used to diagnose the variations in hydrological series and overcomes the unreliability of a single-method examination as well as the inconsistency of a multiple-methods examination. Then combining with the data of rainfall and runoff and the construction of cascade hydropower plants, the causes of water level variation are discussed. The results indicate: (1) The relationships of water level among Jiuzhou, Jiajiu and Yunjinghong are different on spatial scales. The water level variation of Jiuzhou and Yunjinghong are closely linked, while that of Jiajiu has little contact with the others. (2) Jump variations in varying degrees happen in the water level series of the three stations, whose change points mainly center on the construction and operating periods of the Manwan hydropower station and the Dachaoshan hydropower station, while there is no obvious variation in the series of precipitation and runoff. The fact above indicates that the water level variation in the lower reaches of Lancang River is significantly influenced by the cascade hydropower plants.
Master degree candidate
State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University
Wednesday, January 4
10:30 AM – 12:30 PM