THE FLOOD AND SEDIMENT DISASTERS IN KYUSHU AREA ON JULY 19 TO 20, 2003.

2003年7月19日至20日，九州地区因暴雨发生河流洪水、滑坡和泥石流。特别是福冈市的地铁站、购物中心和许多办公大楼在7月19日被淹没，水俣市在7月20日的泥石流中有15名市民死亡。本研究探讨了这些灾害发生的过程和原因。结果表明：(1)福冈洪涝灾害福冈市位于三笠河下游，大在府市位于上游。大宰府市最大时雨量约99毫米/小时，最大时雨量315mm。在大宰府市有许多边坡破坏和泥石流地区。福冈市的洪水是由于上游地区的暴雨造成的。(2)水俣泥石流灾害水俣市最大小时降雨量约91 mm/h，最大累计降雨量约323mm。在这个城市发生了许多滑坡和泥石流。崇礼地区发生了大的泥石流灾害。所发现的泥石流为砾石型泥石流。

The occurred river flood, slope failure and debris flows due to heavy rains in Kyushu area on July 19 to 20, 2003. Especially Fukuoka City had the subway station, shopping center and many office buildings inundated on July 19 and Minamata City had 15 citizens killed debris flows on July 20. The present study has investigated the process and the causes of these disasters. The results obtained are as follows :(1) The Fukuoka flood disaster Fukuoka city is in the downstream area of the Mikasa river and Dazaifu city in the upstream area. Dazaifu City had the maximum hourly and accumulated rainfall of about 99 mm/h 315mm. In Dazaifu City there are many areas of slope failure and debris flows. The Fukuoka-city flood is due to the heavy rain in the upstream area.(2) The Minamata debris flow disaster The maximum hourly and accumulated rainfall were about 91 mm/h and 323mm in Minamata City. In this city there occured many slope failures and debris flows. The Atsumari district had the big debris flow disaster. The debris flow is found gravel-type of debris flow.