Acta Geographica Sinica ›› 2004, Vol. 59 ›› Issue (1): 125-135.doi: 10.11821/xb200401016

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Simulation of Water Runoff Using Estimated Global Precipitation Data: Taking the Upper Reaches of the Changjiang River as an Example

HAYASHI Seiji1, MURAKAMI Shogo1, WATANABE Masataka1, XU Baohua2   

  1. 1. National Institute for Environmental Studies, Tsukuba 305-8506, Japan;
    2. Changjiang Water Resources Commission, Wuhan 430010, China
  • Received:2003-10-08 Revised:2003-11-10 Online:2004-01-25 Published:2004-01-25
  • Supported by:

    Integrated Environmental Monitoring (IEM) Subproject, the Asia-Pacific Environmental Innovation Strategy Project (APEIS)

Abstract:

To evaluate the performance of a computer model simulating runoff in the upper reaches of the Changjiang (Yangtze) River Basin over a relatively short time interval, including examining the applicability of the input precipitation data generated from global circulation models and satellite data, we used a spatially distributed model, HSPF with the ISLSCP precipitation data for 1987 and 1988 as input data. The Nash-Sutcliffe coefficient (R2) for 5-day average stream flow was 0.94 in the calibration period and 0.95 in the verification period for the whole upper region. Moreover, the model simulated the 5-day average stream flow well in each main tributary, as shown by R2 values of 0.46 to 0.96, except that it underestimated the peak flow rates during the flood season over two years by up to 71% in the Tuojiang River and 61% in the Jialingjiang River. The ISLSCP precipitation tended to be more frequent and less intense than the measured precipitation. This was probably the main reason why the HSPF did not perform well in all regions at all times.

Key words: Changjiang River, a spatially distributed hydrological model, land use, global precipitation