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)
(1) Disaster Prevention Research Institute, Kyoto Univ.
(4) Department of Civil Engineering Systems, Kyoto Univ.
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 : |
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Disaster Prevention Research Institute, Kyoto Univ. | |
Address : | Presentation : |
Gokasho, Uji, Kyoto 611-0011 | |
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E-mail : | |
tatikawa@rdp.dpri.kyoto-u.ac.jp | |