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《Journal of Glaciology and Geocryology》 1992-02
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An Extreme Heavy Debris Flow in Mt. Gongga

Lu Ruren (Institute of Mountain Hazards and Environment, Chinese Academy of Sciences & Ministry of Water Conservancy)  
A catastrophic debris flow of meitwater-rain type occurred in the Nanguan gully on the left bank of the middle reaches in ihe Yunzi Valley of the east slope in Mt. Gongga at 15-18 h, on 26 July, 1989. It destroyed a large highway bridge , blocked up the Dadu River and forced main flow line of the Dadu River towards the left bank. The Luding-Shimian Highway was washed out a length of 820 m, and the road had been closed for 9 months. The economy loss of 2.45 millions Yuan was estimated. The Nanguan gully, located at 101 ° 54 ' 37.1 " -101 ° 59 ' 11.3 " E, 29° 41 ' 23.9 " -29 ° 44 ' 39.5 " N, has an area of 19.8 km2 large with a glacier area of 0.84 km2. The elevation range is 3 988 m, average longitudinal gradient of main gully bed is 215.7‰. A length of flow way of the debris flow is above 30 km, it appears in gustiness lasting 3 hours. The fluid appears in viscousness. The maximum weight of the unit volume is from 2.0 to 2.4 t/m3. The velosity changes from 8.2 to 11.7 m/s. The peak flood changes from 2336.0 to 6775.2 m3/s. The total runoff into the Dadu River is about 1 716.4 × 104 m3, with the mud, sand and stone of 627.0 × 104 m3. The height creeping up of debris flow on the bend way is 15.5 to 16.5 m. A total of remaining sediments in the gully bed is 310.4 × 104 m3. The debris flow body filled all the gully bed on its flow way, made sedimentation of overflowing, decelerating and back flowing.
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