Acta Geographica Sinica ›› 2009, Vol. 64 ›› Issue (3): 315-322.doi: 10.11821/xb200903006

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Estimating Residence Time of Groundwater in the Wudinghe River Basin

ZHU Ruirui1,2, LIU Changming1, ZHENG Hongxing1   

  1. 1. Institute of Geographic Sciences and Natural Resources Research,CAS,Beijing 100101,China;
    2. Graduate University of Chinese Academy of Sciences,Beijing 100049,China
  • Received:2008-11-25 Revised:2009-01-09 Online:2009-03-25 Published:2009-03-25
  • Supported by:

    National Natural Science Foundation of China,No.40671031;No.40601015;National Key Technology R&D Program; No.2007BAC03A11

Abstract:

In this paper, the residence time of groundwater in dry season, wet season and yearly average is estimated based on daily streamflow records of 11 hydrological stations in Wudinghe River Basin. Results show that: (1) recession constant of groundwater in the Wudinghe River Basin, ranging from 0.72 to 0.89, has a larger recession rate in wet season than in dry season. (2) Spatially, the recession rate of groundwater in hilly region is the biggest, but is the smallest in the sandy region. (3) Half-residence time of groundwater varies from 1.8 to 45.5 days while the residence time of groundwater is between 34 and 105days in different catchments, showing significant spatial variation. The annual average residence time of groundwater decreases from 101 days in the upper reaches to 84 days in the lower reaches.

Key words: baseflow, recession constant, residence time, Wudinghe River