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Possible hydrological effect of rainfall duration bias in dynamical downscaling

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Title: Possible hydrological effect of rainfall duration bias in dynamical downscaling
Authors: Tamaki, Yuta Browse this author
Inatsu, Masaru Browse this author →KAKEN DB
Yamada, Tomohito J. Browse this author →KAKEN DB
Keywords: rainfall duration bias
heavy rainfall events
weather pattern
dynamical down-scaling
Issue Date: 16-Oct-2019
Journal Title: Hydrological Research Letters
Volume: 13
Issue: 4
Start Page: 55
End Page: 61
Publisher DOI: 10.3178/hrl.13.55
Abstract: Motivated by the problem of rainfall duration bias typically found in dynamical downscaling, its possible effect on hydrology was evaluated for heavy rainfall events over Kyushu, Japan, during summer. Heavy rainfall in western Kyushu is often related to a persistent Baiu rainband across Kyushu, while in eastern Kyushu it is related to the passage of typhoons near Kyushu. For typical heavy-rainfall periods, we ran a tank model for several target rivers to analyze runoff and water-depth sensitivity to the hyetograph by artificially extending the rainfall duration to 8 hours while maintaining the same total rainfall. This showed that a spike in peak runoff was suppressed by prolonged weak rainfall as typically found in downscaling outputs. The timing of rising runoff and water depth in the tank model was shifted earlier.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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