A methodology to examine a depth-discharge constitutive equation for rainfall-runoff modelling

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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Copyright (c) 2021 The Author(s) CC-BY 4.0

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