Abstracts for the 5th International GAME Conf.

3-5 October 2001

Aichi Trade Center

Nagoya Japan

Simulation of river discharge in the Huaihe River Basin in China

TACHIKAWA Yasuto (1), TANAKA Kenji (1), TAKARA Kaoru (1), ICHIKAWA Yutaka (4), SHIIBA Michiharu (4)

To predict floods, droughts and future water resources for a large river basin, a macro grid based distributed hydrological model to estimate a river discharge was developed and applied to the Huaihe River basin in China (130,000km2). The main features of our model development are as follows: 1) For modeling a water movement of a large river basin, channel routing has a dominant effect on forming a discharge hydrograph, thereby a channel network data set which represents actual locations and linkages of river segments is arranged and it is incorporated into a model development to route a river flow on physical basis; 2) To incorporate meso scale atmospheric model outputs into a hydrological model effectively, a watershed basin is subdivided into grid boxes according to a grid system of a meso-scale atmospheric model; a subsystem model which represents a runoff process and a flow routing process is set up for each grid box; and the subsystem models are linked together to build a total runoff simulation system. The model parameters were identified by using hydrological data sets observed in the Shigan River basin in China during the GAME HUBEX Intensive Observation Period in 1998. To simulate river discharges in the Huaihe River basin, hourly precipitation and evapotranspiration data sets with five minute spatial resolution developed by Tanaka et al. (2000) were used, which were generated from the GAME HUBEX IOP observed data sets with a land surface hydrological model, the SiBUC model (Tanaka et al., 1994). A comparison of simulated and observed discharges between May 1 in 1998 and August 31 in 1998 shows that change patterns of these discharge hydrographs correspond fairly well, but simulated hydrographs at lower reaches are underestimated. This might be due to overestimation of evapotranspiration or underestimation of precipitation in the data set, however further study is needed to make the cause for the underestimation clear. The effect of channel routing model to estimate river discharges for a large river basin is also discussed.

Submittal Information

Name : Date :
    TACHIKAWA Yasuto
    29-May-01-15:09:33
Organization : Theme :
    Disaster Prevention Research Institute, Kyoto Univ.
    Theme 2
Address : Presentation :
    Gokasho, Uji, Kyoto 611-0011
    Poster or oral
Country : Abstract ID :
    Japan
    T2TY29May01150933
Phone : Fax :
    +81-774-38-4126
    +81-774-38-4130
E-mail :
    tatikawa@rdp.dpri.kyoto-u.ac.jp