Yutaka Ichikawa, Hyunuk An, Yasuto Tachikawa
Received 2021/02/19, Accepted 2021/05/10, Published 2021/06/29

Yutaka Ichikawa¹⁾, Hyunuk An²⁾, Yasuto Tachikawa¹⁾

1) Department of Civil and Earth Resources Engineering, Graduate School of Engineering, Kyoto University, Japan
2) Department of Agricultural and Rural Engineering, Chungnam National University, Korea

A number of rainfall-runoff models have been developed for hydraulic and hydrological engineering with an emphasis on reproducing river discharge time series. Physically-based rainfall-runoff models have recently reached a certain level of achievement following the advancement of computers and the development of various geographical and meteorological datasets. However, it has been pointed out that the current physically-based models do not properly reflect observed hillslope water dynamics. The present paper proposes a methodology to examine the capability of a depth-discharge constitutive equation for physically-based rainfall-runoff modelling to simulate hillslope water dynamics. An application of the methodology suggested that 1) the targeted constitutive equation was capable of representing the depth-discharge relationship on hillslopes under the assumed conditions, 2) the runoff simulations with the constitutive equation described hillslope water flows, at least in the downward direction, and 3) there was a possibility that the parameters in the constitutive equation was determined from the internal structure of hillslope water dynamics.

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