Acta Geographica Sinica ›› 2003, Vol. 58 ›› Issue (1): 53-62.doi: 10.11821/xb200301007

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Simulation of Hydrological Response to Land Cover Changes in the Suomo Basin

DENG Huiping1, LI Xiubin2, CHEN Junfeng2, ZHANG Ming2, WAN Hongtao2   

  1. 1. Department of Geography, Nantong Normal College, Nantong 226007, China;
    2. Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China
  • Received:2002-05-10 Revised:2002-09-27 Online:2003-01-25 Published:2003-01-25
  • Supported by:

    Knowlege Innovation Project of Chinese Acdemy of Sciences, No.KZCX2-310; No.KZCX-Y-02

Abstract:

In order to study the effects of land cover changes on hydrology, the TOPMODEL was tested for the Suomo basin on the upper reaches of the Yangtze River. A modified version of the model was used to adapt to the basin condition and data availability. The model was calibrated with five year measured daily discharge record (1980-1984) and the parameters were estimated. With this model and the maps of land cover of the 1970s, the 1980s and the 1990s, daily discharge from 1960 to 1999 was simulated. Comparing simulated discharge with the measured records from 1960 to 1999 in percentage efficiency, the model gave a sound result. After that, simulation was conducted under four land cover scenarios with the tested model. The main results were as follows: With the increase in land cover and interception capability, the basin interception evaporation increased, transpiration and soil evaporation decreased, and overall evaporation increased. Soil moisture increased and saturation zone storage and basin water storage decreased with the increase in land cover and maximum interception capability. Surface runoff and stream discharge decreased and subsurface runoff increased with the increase in land cover at the beginning while decreased with further land cover increase. The degree of hydrological effects of land cover increase depends on the difference value between actual evapotranspiration and potential evaporation.The bigger difference, the higher effects of land cover changes on basin hydrology are.

Key words: land cover change, TOPMODEL testing, scenario simulation, hydrological effects