METEOROLOGICAL CONTROL BY INTERVENTION IN WIND SPEED FIELD USING LES FOR THE GUERRILLA HEAVY RAINFALL AT TOGA RIVER, KOBE, 2008

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  • 2008年神戸都賀川豪雨を対象とした風速場操作による気象制御LES実験

Abstract

<p> As global warming progresses, there is concern that heavy rainfall will become more severe, and it is hoped that meteorological control will help to reduce heavy rainfall. In this study, Large-Eddy-Simulation (LES) was used to reproduce the 2008 Guerrilla heavy rainfall at Toga River, Kobe, Japan, and the effect of controlling the near-surface wind field to weaken vortex tubes, which are regarded as an important factor in the development of the Guerrilla heavy rainfall, was investigated. The results showed that the LES can represent complex cases of guerrilla heavy rainfall such as the case of Toga River, and that the wind field manipulation can weaken the maximum rainfall intensity by about 27%. The suppression mechanism is suggested to be the suppression of updrafts due to the weakening of vortex tubes, misalignment between the location of the temperature anomaly that causes updraft and the location of the airflow convergence, and the reduction in the amount of water vapor uptake. In conclusion, a meteorological control method to suppress heavy rainfall by manipulating the wind velocity field from meteorological perspective.</p>

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