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Spatial rainfall distribution at a storm event in mountainous regions, estimated by orography and wind direction
Author(s) -
Oki T.,
Musiake K.,
Koike T.
Publication year - 1991
Publication title -
water resources research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.863
H-Index - 217
eISSN - 1944-7973
pISSN - 0043-1397
DOI - 10.1029/90wr02427
Subject(s) - orography , storm , climatology , geology , wind direction , wind speed , meteorology , spatial distribution , orographic lift , current (fluid) , structural basin , environmental science , precipitation , geography , geomorphology , remote sensing , oceanography
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.