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CHARACTERISTICS AND EVOLUTION OF DEBRIS FLOW MOTION IN JIANGJIA GULLY IN YUNNAN PROVINCE
Author(s): HUANG Ying, DING Ming-tao, MIAO Cheng, WANG Jun, ZHOU Peng, School of Environment and Resources, Southwest University of Science and Technology
Pages: 1434-
1442
Year: 2015
Issue:
8
Journal: Resources and Environment in the Yangtze Basin
Keyword: Jiangjia Gully; debris flow; motion characters; development;
Abstract: Based on the 1965-2005 observation data of Jiangjia Gully and the 1965-2005 daily precipitation data of Huize County in Yunnan Province,several movement elements of debris flow were detailed analyzed such as discharge,bulk density,sediment discharge and its development.Based on the Hurst index method,the Hurst index of debris flow sediment discharge was calculated to be 0.682,showing a strong positive sustainability and strong growth in future.The rainfall Hurst index was 0.605,showing a weaker growth trend in the future.At the same time,with the wavelet analysis method,annual sediment discharge was found to had several time dimensions of periods:8years,14 years,and 24 years was the first three main cycles.Annual sediment discharge would decrease and the debris flow activity would be weaker in the coming 15 years.Within 15 years,the debris flow activity would have a shorter increase and the debris flow activity would be strong.Huge scale,strong hazard and different types of Jiangjia Gully debris flows were concluded in the research.
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