Journal of Geographical Sciences ›› 2008, Vol. 18 ›› Issue (1): 107-114.doi: 10.1007/s11442-008-0107-4
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WANG Lixia, REN Zhiyuan
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Supported by:
National Natural Science Foundation of China, No.40771019; Innovation Foundation of Shaanxi Normal University
Abstract:
Although water has the central function of the bloodstream in the biosphere espe-cially in arid or semi-arid regions such as Yan’an region in northwestern China, yet the very limited attention is paid to the role of the water-related processes in ecosystem. In this re-search, based on continuous nearly 50-year data including runoff volume, sediment discharge as well as sediment accretion from hydrographic stations, and 10-year information of water quality from pollution monitoring stations, the method for measuring in-stream flow require-ment has been put forward supported by experiential models and GIS spatial analysis. Addi-tionally, the changes of in-stream flow requirement for environment and economic develop-ment have been addressed from spatial-temporal dimensions. The results show that: (1) According to the central streams in Yan’an region, mean annual in-stream flow requirement reaches 1.0619 billion m3, and the surface water for economic exploitation is 0.2445 billion m3. (2) Mean annual in-stream flow requirement for sediment transfers in flood period occupies over 80% of the integrated volume in a year. (3) From the 1950s to 1970s, in-stream flow requirement for sediment transfers is comparatively higher, while from the 1980s to 1990s, this requirement presents a decreasing tendency.
Key words: GIS spatial analysis, Yan’an region, in-stream flow requirement, spatial-temporal differences
WANG Lixia, REN Zhiyuan. Spatial-temporal differences in in-stream flow requirement based on GIS: A case study of Yan’an region, northern Shaanxi[J].Journal of Geographical Sciences, 2008, 18(1): 107-114.
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