Acta Geographica Sinica ›› 2011, Vol. 66 ›› Issue (9): 1251-1260.doi: 10.11821/xb201109010

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Responses of Water Regimes in Dongting Lake Area under Different Dispatching Modes during the Running Period of the Three Gorges Reservoir

LI Jingbao1, ZHANG Zhaoqing1, OU Chaomin2, LI Xichun3, YU Guo1, LIAO Xiaohong3   

  1. 1. College of Resources and Environment Science, Hunan Normal University, Changsha 410081, China;
    2. College of Information System and Management, National University of Defense Technology, Changsha 410073, China;
    3. Hunan Hydro & Power Design Institute, Changsha 410007, China
  • Received:2011-06-02 Revised:2011-07-08 Online:2011-09-20 Published:2011-11-04
  • Supported by:

    National Natural Science Foundation of China, No.41071067; Construction Program of the Key Discipline of the Physical Geography in Hunan Province

Abstract: Based on the field-survey hydrological data in typical years, the effect of different dispatching modes during the running periods of the Three Gorges Reservoir on water regimes in Dongting Lake area is comparatively analyzed. The results are shown as follows. 1) The influence periods are from 25th May to 10th June, from 1st July to 31st August, from 15th September to 31st october and from December to the next April, among which the influence of the water-supplement dispatch in the dry season is not very sensitive. 2) During the period under the pre-discharge dispatch, the runoff slightly increases as well as both the average and highest water levels rise in the usual year, while in the wet and dry years, the average increase in the runoff is 40.25 × 108 m3 and the average rises of the average and highest water levels are both 1.06 m. 3) As for the flood-storage dispatch, the flood volume increases slightly in the usual years. In the dry and wet years, the flood volume, the average and highest flood water levels averagely reduce by 444.02 × 108 m3, 2.64 m and 1.42 m respectively. 4) Under the water-storage dispatch, the runoff slightly increases and the water level rises in a sort in the usual year. And in the dry and wet years, the average decreases in the runoff, the average water level and the highest water levels are respectively 185.27 × 108 m3, 3.13 m and 2.14 m. 5) During the period under the water-supplement dispatch, the runoff, the average water level and the highest water levels averagely decline by 337.7 × 108 m3, 1.89 m and 2.39 m respectively in the usual and wet yeas. However, in the dry year, the runoff increases, and the average and highest water levels slightly go up.

Key words: the Three Gorges Reservoir, dispatch modes, Dongting Lake area, the water regime change