地理学报

Acta Geographica Sinica ›› 2002, Vol. 57 ›› Issue (1): 11-18.doi: 10.11821/xb200201002

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Natural Eco-enironmental Evaluation of West Route Area of Interbasin Water Transfer Project

YANG Sheng-tian1, LIU Chang-ming1, YANG Zhi-feng1, SUN Rui2, ZHOU Xiao-dong2   

  1. 1. Institute for Environment Research, Beijing Normal University, Beijing 100875;
    2. Resource & Environment Department, Beijing Normal University, Beijing 100875
  • Received:2001-07-04 Revised:2001-09-26 Online:2002-01-25 Published:2002-01-25
  • Supported by:

    The National Key Basic Research Project of China, No. G1999043-01

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Abstract:

The impact of interbasin water transfer on environment is very significant. The affected area of the west route scheme of South to North Water Transfer Project in China (SNWT) is located in the southeasten part of the Tibetan Plateau, where the altitude is high with fragil eco-environment. Therefore, it is necesary for SNWT to analyze the natural eco-environment. In the article, we apply the remote sensing and GIS to analyze the natural environment of the study area which lies in the range of 31o27'～33o58'N and 96o57'～102o30'E, covering an area of 91 200 km2. The materials we used include 8 images of TM, 1:1 000 000 basic geographic data of China, the meteorologic data from 631 stations in China (1958~1998), statistic data and natural resources maps of Qinghai and Sichuan provinces. We obtained natural environmental factors such as land cover, vegetation cover, NPP(Net Primary Productivity), temperature, precipitation and topographic terrain by remote sensing and GIS method. We use the natural environment index which contains natural factor index and the total number of natural factor analyzed to express the natural conditions of the study area. The natural factor index of land cover, vegetation cover, NPP, temperature, precipitation and altitude are calculated and the natural environment index is divided into four grades or four level sub-areas. According to the calculation result, we analyze the features of each grade of the natural environment index or the natural eco-environment of the four sub-areas, so as to provide new trajectories and new methods that can be used for reference in environmental impact assessment of the affected area of the west route of South-to-North Water Transfer Project in China.

Key words: South to North Water Transfer, environmental assessment, remote sensing, GIS