Possible hydrological effect of rainfall duration bias in dynamical downscaling

IF 0.6 Q4 WATER RESOURCES Hydrological Research Letters Pub Date : 2019-10-16 DOI:10.3178/hrl.13.55
Yuta Tamaki, M. Inatsu, T. Yamada
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Abstract

: Motivated by the problem of rainfall duration bias typi‐ cally 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 peri‐ ods, we ran a tank model for several target rivers to analyze runoff and water-depth sensitivity to the hyetograph by arti‐ ficially 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 tim‐ ing of rising runoff and water depth in the tank model was shifted earlier.
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动态降尺度中降雨持续时间偏差可能产生的水文效应
基于动力降尺度中常见的降雨持续时间偏差问题,对日本九州夏季强降雨事件的水文影响进行了评估。九州西部的强降雨通常与九州上空持续的白雨带有关,而九州东部的强降雨则与九州附近的台风有关。对于典型的强降雨周期,我们运行了几个目标河流的水箱模型,通过人工延长降雨持续时间至8小时,同时保持相同的总降雨量,来分析径流和水深对雨量记录仪的敏感性。这表明,长时间的弱降雨抑制了峰值径流的峰值,这通常出现在降尺度产出中。水槽模型中径流量上升和水深上升的时间提前。
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来源期刊
CiteScore
1.90
自引率
18.20%
发文量
9
审稿时长
10 weeks
期刊介绍: Hydrological Research Letters (HRL) is an international and trans-disciplinary electronic online journal published jointly by Japan Society of Hydrology and Water Resources (JSHWR), Japanese Association of Groundwater Hydrology (JAGH), Japanese Association of Hydrological Sciences (JAHS), and Japanese Society of Physical Hydrology (JSPH), aiming at rapid exchange and outgoing of information in these fields. The purpose is to disseminate original research findings and develop debates on a wide range of investigations on hydrology and water resources to researchers, students and the public. It also publishes reviews of various fields on hydrology and water resources and other information of interest to scientists to encourage communication and utilization of the published results. The editors welcome contributions from authors throughout the world. The decision on acceptance of a submitted manuscript is made by the journal editors on the basis of suitability of subject matter to the scope of the journal, originality of the contribution, potential impacts on societies and scientific merit. Manuscripts submitted to HRL may cover all aspects of hydrology and water resources, including research on physical and biological sciences, engineering, and social and political sciences from the aspects of hydrology and water resources.
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