Author(s): Yasuhiro Murakami; Makoto Nakatsugawa; Kenichi Takada
Linked Author(s):
Keywords: Slope failure; Heavy rain; Sediment production
Abstract: A heavy rainfall caused by a stationary front vitalized from season' s 10th typhoon occurred in southeastern part of Hokkaido Japan on August 8 to 10,2003. The 48 hour total rainfall of Biratori observation point catchments recorded 334mm was the largest precipitation in the last 41 years. During the event, huge amount of sediment and drift wood flowed into stream and Nibutani dam reservoir. Total amount of deposition of Nibutani-dam reservoir is 2.4million m 3 was provided from Nukabira and Saru river basin during this flood. Based on field investigation and remote sensing data analyze after the event, The authors analyzed contributing factor of slope failure such as rainfall, slope angle, vegetation and geological conditions, it was made clear that (1) the slope failure area were increased by about 3.6 times that of 2002; (2) the slope failure strong related with hourly rainfall, slope angle and basement rock.
Year: 2004