Spatial rainfall distribution at a storm event in mountainous regions, estimated by orography and wind direction
Spatial rainfall distribution at a storm event in mountainous regions, estimated by orography and wind direction
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通过地形和风向估算的山区风暴事件时的空间降雨分布
DOI：
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发表时间：
1991
期刊：
影响因子：
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通讯作者：
T. Koike
中科院分区：
文献类型：
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作者：
T. Oki;K. Musiake;T. Koike
本文讨论了暴雨过程中雨量分布的地形效应。主要影响表现为地面强迫上升气流。包括盆地地形在内的静水大气三维数值模式被用来估计任何风向的上升流区。作者还提出了风暴事件方向概率的新概念。当风从较高的DiPoSE方向而不是较低的DiPoSE方向吹来时，更有可能发生强风暴。风暴事件的风向由DiPoSE分析确定，并在数值模式中使用。计算的上升气区被认为是山区流域的强降雨区。对结果进行了检验，并与观测结果进行了比较。
In this paper the orographical effect for rainfall distribution at a storm event is discussed. The main effect is represented by the ground-forced ascending current of air. A three-dimensional numerical model of the hydrostatic atmosphere, including basin orography, is used to estimate the ascending current area for any wind direction. The authors also propose a new concept named directional probability of storm event (DiPoSE). A severe storm is more likely to occur when the wind blows from a high DiPoSE direction rather than from a low DiPoSE direction. The wind direction at a storm event is determined from a DiPoSE analysis and is used in the numerical model. The calculated ascending air region is regarded as a severe rainfall area in mountainous river basins. The results are examined and compared with observations.