Assessment of antecedent moisture condition on flood frequency: An experimental study in Napa River Basin, CA
Assessment of antecedent moisture condition on flood frequency: An experimental study in Napa River Basin, CA
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前期湿度条件对洪水频率的影响评估：加利福尼亚州纳帕河流域的实验研究
DOI：
10.1016/j.ejrh.2019.100629
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
V. Chandrasekar
中科院分区：
文献类型：
--
作者：
Jungho Kim;L. Johnson;R. Cifelli;A. Thorstensen;V. Chandrasekar
研究区域本研究区域是加利福尼亚州纳帕河流域，其前期土壤湿度状态和降水量是发生极端洪水的主要驱动因素。研究重点本研究基于实验应用方案和预处理，评估了前期湿度条件对洪水频率的影响。为此，使用分布式水文模型进行了 T 年洪水模拟。通过基于雷达的代表性降水场和降水频率分析，生成了具有与特定 T 年重现期相对应的降水量的分布式降水模式。将前期湿度条件的干燥、正常和潮湿应用于每个 T 年洪水模拟，以反映可变的初始土壤湿度状态。该地区的新水文见解针对特定的目标风暴事件推导了洪水频率、前期湿度条件和降水频率之间的关系。对于正常的先前湿度状态，该关系表明 T 年降水量可能会产生洪水，其返回间隔几乎与使用计量记录得出的返回间隔相同。对于饱和土壤条件，7 年一次的降水事件可能引发 100 年一遇的洪水。相反，如果土壤条件干燥，200 年一次的降水事件可能只会产生 15 年一次的洪水事件。研究结果强调了土壤湿度对洪水径流的重要性，并表明土壤湿度监测有助于改善洪水预报。
Study regionThis study region is the Napa River basin in California whose antecedent soil moisture states and precipitation magnitudes are primary drivers to occur extreme floods.Study focusThis study assessed the influence of antecedent moisture condition on flood frequency, based on an experimental application scheme and pre-processing. For this purpose, T-year flood simulations were conducted using a distributed hydrologic model. Distributed precipitation patterns which have an amount of precipitation corresponding to a specific T-year return period were generated by representative radar-based precipitation fields and precipitation frequency analysis. Dry, normal, and wet of antecedent moisture condition were applied to each T-year flood simulation to reflect variable initial soil moisture states.New hydrological insights for the regionThe relationship among flood frequency, antecedent moisture condition, and precipitation frequency was derived for a specific target storm event. For normal antecedent moisture states, the relation showed that T-year precipitation could generate floods having return intervals nearly identical to those derived using gage records. For saturated soil conditions, a 7-year precipitation event could trigger a 100-year flood. Conversely, a 200-year precipitation event with dry soil conditions might generate only a 15-year flood event. The results emphasize the importance of soil moisture to flood runoff and suggest that soil-moisture monitoring could aid in improving flood forecasting.
影响因子：
5.4
作者：
Smith, Andrew;Sampson, Christopher;Bates, Paul
通讯作者：
Bates, Paul