Authors: FANG Chun-ming *, CAO Wen-hong *, MAO Ji-xin *, LI Hai-jun **

* China Institute of Water Resources and Hydropower Research, Beijing 100048, China
** Yueyang Hydrology and Water Resources Survey Team of Yangtze River Water Resources Commission, Yueyang 414000, China

Abstract: Based on the mechanism study and data analysis, this article revealed the water level of the Poyang Lake dividing the lake phase and river phase, clarified the effect of Yangtze River water flow on the out flow of the lake, deduced the condition of the occurrence of backward flow, and derived the coefficient of the regulation effect of the lake on flood. The relation between the Poyang Lake and the Yangtze River is clarified. By analyzing the characteristic of the Poyang Lake, the influence of the Three Georges Reservoir storage in dry season is studied. It is found that in the early period of the operation of Three Georges Reservoir, in the forepart of impounding period, the Poyang Lake increased water by 2.3×10 9 m 3 to the river. But in the second part of impounding period, the Lake reduced water supplies by 1.1×10 9 m 3 to the river. It is predicted that after thirty years of the Three Georges Reservoir put into operation, due to the influences of the Three Georges Reservoir storage and riverbed erosion, the dry season of Poyang Lake will be shift to one month in advance.

Key words: Poyang Lake, the Three Georges Reservoir, relation between lake and river

Published in: Journal of Hydraulic Engineering, Vol. 43, No. 2, 2012

Article ID: 0559-9350 (2011) 02-0175-07