ANALYSIS OF DEPENDENCE OF HEAVY RAINFALL ON ELEVATION USING DATA OBSERVED AT RAILWAY STATIONS AND METEOROLOGICAL STATIONS

Abstract

This study statistically analyzed the dependence of heavy rainfall on elevation in mountain areas, using long-term precipitation data observed by raingauges installed densely at railway stations of East Japan Railway Company and meteorological stations of Japan Meteorological Agency. Total rainfall amount of heavy rainfall depends on elevation, and the increasing rate of total rainfall amount is 5-10% /100m. Maximum hourly precipitation of heavy rainfall cased by typhoon and front depends on elevation, and the increasing rate of maximum hourly precipitation is 10-20% /100m. However, maximum hourly precipitation of heavy rainfall cased by thunderstorm dose not depend on elevation. Furthermore, the frequency of heavy rainfall cased by typhoon and front depends on elevation.