Orographic Effects on the Evolution and Development of Heavy Rainfall Systems over the Nagasaki Region, Japan(SPECIAL ISSUE CELEBRATING TEN YEARS OF ESTABLISHMENT OF FACULTY OF ENVIRONMENTAL STUDIES)

The behavior of heavy rainstorms took place at the Nagasaki region is studied from the viewpoint of orographic effects on the precipitation. The effects categorized in this study contain (1) the rain cloud back-built by the gust front originated from the descending air current inside of the convective cloud, (2) the stationary and long-lasting rainfall line generated from the ascending air motion along the mountain slope, (3) the newly evolutive convective cloud, which caused by the strong gust front from thundercloud in the downward slope of the mountain valley, and (4)the enhancement of rainfall generated by the merge of two kinds of rain systems of different type