Acta Geographica Sinica ›› 2003, Vol. 58 ›› Issue (6): 854-860.doi: 10.11821/xb200306008

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Study on the Spatio-temporal Variation of Groundwater Salt Content in Xinjiang Weigan Catchment

SU Litan1,2, SONG Yudong1, ZHANG Zhanyu2   

  1. 1. Xinjiang Institute of Ecology and Geography, CAS, Urumqi 830011, China;
    2. College of Hydropower and Water Conservancy Engineering, Hohai University, Nanjing 210098, China
  • Received:2003-06-10 Revised:2003-08-18 Online:2003-11-25 Published:2003-11-25
  • Supported by:

    National 973 Program for Basic Research, No.G1999043506

Abstract:

Sampling and testing are conducted on the salt content of the groundwater in the 3 408 km2 of Weigan watershed and semi-variograms function analysis is made afterwards based on the available data by using the geo-statistical method. Results showed that the variance curves of the groundwater salt content in the years 1998 and 1999 display a spherical model, while the curves in 1997 and 2000 exhibit a linear model. Analysis of water samples obtained from 1997 to 2000 indicates that the salt content varies both temporally and spatially in this area. The salinity increases, in the spatial scale, from northwest to southeast of the research area, with east and south higher than west and north separately, and southeast higher than northwest. And the groundwater salinity in the southeast is aggravating with the elapse of time. Geopack and Surfer 7.0 softwares are used to work out a spatio-temporal variation map of salt content, thus providing basis for the decision-making on water-soil management and salinization prevention in this area.

Key words: geo-statistics, soil content, semi-variograms function, Kriging, spatio-temporal variation