2008年神戸都賀川豪雨のLES実験と風速場操作による気象制御

Abstract

In recent years, guerrilla heavy rainfall have had a serious impact on cities. Nevertheless, the mechanisms of their occurrence and development remain largely unknown. In this study, a guerrilla heavy rainfall that occurred in July 2008 in the Toga River, a small to medium-sized river in Kobe City, was represented by an LES model. As a result, the model was able to express that the guerrilla heavy rainfall in the Toga River was enhanced by the convergence of moist westerly winds from the Seto Inland Sea and cold outflow from the precipitation zone that existed on the north side of Mt. Rokko. In addition, we tested the possibility of suppressing heavy rainfall by weakening the vortex tube, an important indicator of guerrilla heavy rainfall, by controlling the wind velocity field in a guerrilla heavy rainfall in the Toga River. As a result, The maximum rainfall intensity was reduced from approximately 190 mmh⁻¹ to 140 mmh⁻¹, 27% less than the previous maximum intensity.