Comparison of three flood runoff models in the Shonai River basin Japan

Kojima T., . and Tachikawa Y., . and Takara K., . (2004) Comparison of three flood runoff models in the Shonai River basin Japan. [Proceedings Paper]

Distributed parameter runoff models are recently developed and expected to be used in practice. They can take into account spatial distribution of rainfall land surface conditions and their changes which affect the runoff from river basins. This paper introduces a grid-cell based distributed rainfall-runoff model that was developed by the authors in 1997. The model uses hydraulics-based overland flow theory and geographic information such a digital elevation models DEM land cover/use based on either the National Land Information developed by Geological Survey Institute GSI or remote sensing imageries. The objective of this paper is to compare this distributed runoff model with two models conventionally used in Japan: the storage function model and the slope-channel system kinematic wave model. The models are assessed in terms of runoff prediction accuracy in the Shonai River Shonai-gawa basin at Shidami 532 square km. This paper discusses some problems to improve the precision of the distributed runoff model and to put it to practical use by comparing the three models on the basis of the indices for the model parameter sensitivity such as the difference in peak time peak discharge and hydrograph shape between observed and simulated hydrographs. The slope-channel system kinematic wave model can reproduce the observed hydrographs well with the optimum model parameters which are almost the same as the conventionally recommended values. Although the grid-cell based distributed model also can reproduce the observed hydrographs well it has a tendency to give earlier peak than the observed one. Further investigation is necessary to improve this tendency by adjusting the roughness coefficient of channel much affecting the peak time. In the storage function model the optimum parameters depend on flood events. Variation in optimum parameters is greater than the other runoff models.

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Abstract

Distributed parameter runoff models are recently developed and expected to be used in practice. They can take into account spatial distribution of rainfall land surface conditions and their changes which affect the runoff from river basins. This paper introduces a grid-cell based distributed rainfall-runoff model that was developed by the authors in 1997. The model uses hydraulics-based overland flow theory and geographic information such a digital elevation models DEM land cover/use based on either the National Land Information developed by Geological Survey Institute GSI or remote sensing imageries. The objective of this paper is to compare this distributed runoff model with two models conventionally used in Japan: the storage function model and the slope-channel system kinematic wave model. The models are assessed in terms of runoff prediction accuracy in the Shonai River Shonai-gawa basin at Shidami 532 square km. This paper discusses some problems to improve the precision of the distributed runoff model and to put it to practical use by comparing the three models on the basis of the indices for the model parameter sensitivity such as the difference in peak time peak discharge and hydrograph shape between observed and simulated hydrographs. The slope-channel system kinematic wave model can reproduce the observed hydrographs well with the optimum model parameters which are almost the same as the conventionally recommended values. Although the grid-cell based distributed model also can reproduce the observed hydrographs well it has a tendency to give earlier peak than the observed one. Further investigation is necessary to improve this tendency by adjusting the roughness coefficient of channel much affecting the peak time. In the storage function model the optimum parameters depend on flood events. Variation in optimum parameters is greater than the other runoff models.

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Item Type:	Proceedings Paper
Additional Information:	Summary En
AGROVOC Term:	RIVERS
AGROVOC Term:	WATERSHEDS
AGROVOC Term:	MODELS
AGROVOC Term:	RUNOFF
AGROVOC Term:	FLOODING
AGROVOC Term:	RUNOFF WATER
AGROVOC Term:	JAPAN
Geographical Term:	MALAYSIA
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:27
URI:	http://webagris.upm.edu.my/id/eprint/16119

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