Acta Geographica Sinica ›› 2004, Vol. 59 ›› Issue (1): 111-117.doi: 10.11821/xb200401014

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Calculating Water Resource Exchange Time of the Yellow River Basin Based on Reservoir Operation

LIU Changming1,2, JIANG Xiaohui1   

  1. 1. College of Resource and Environmental Sciences, Beijing Normal University, Beijing 100875, China;
    2. Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China
  • Received:2003-09-11 Revised:2003-11-28 Online:2004-01-25 Published:2004-01-25
  • Supported by:

    National Key Project for Basic Sciences, No.G1999043601

Abstract:

Aiming at water resource crisis of the Yellow River, this paper discusses the connotation of water exchange time, analyzes the change characteristics of water exchange time based on reservoir action, and then establishes numerical models of the water resident time in the mainstream of the Yellow River. The following conclusions are drawn: (1) The result indicates that the amount of renewable water per month can meet the demand of all kinds of water utilizations and Lijin profile flows naturally when the original amount of water storage in the Longyangxia reservoir is 9.343 billion m3 and water exchange time is 1.46d0; when the original amount of water storage in the Longyang Gorge Reservoir is 5.343 billion m3 and water exchange time is 1.77d0, no-flow will appear in April and May. (2) Water supply and demand are disproportional in time and space. By dispatching reservoir, the water exchange time of the Yellow River at month scale will be lengthened or shortened, which corresponds the disproportion in time and space of water supply and demand, the amount of runoff in no-flood period with reservoirs action is more 8.3 billion m3 than that without reservoirs action, which promotes the efficiency of reasonable utilization of water resources. (3) When the stage of original storage of the Longyangxia increases from 5.343 billion m3 to 18.043 billion m3, the multi-year scale water exchange time in the Yellow River is close to d0. So, reservoir action has no effect on multi-year scale water exchange time. (4) Water exchange time depends on hydrologic cycle and water balance, which controls the renewable capacity of water resources in various time scales, and determines the total amount of regional water resources accurately. All these offer scientific basis for establishing water supply system for sustainable utilization of water resources.

Key words: Yellow River, water exchange time, water resource operation, storage change