The identification and topographic evolution of hillslope debris flows

• Main Authors: Wang, Zhen-Yu, 王振宇
• Other Authors: Chen, Tien-Chien
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/45218547406464594308

碩士 === 國立屏東科技大學 === 水土保持系所 === 100 === 125 debris flow events in Kao-ping River in Typhoon Morakot were studied on the location, occurrence and topographic characteristics. The hillslope debris flow (HDF) was distinguished from 125 debris flows according to the special characteristic on the occurrence and topographic characteristics. 12 criteria were proposed to identify the hillslope debris flow from the stream debris flows, the description and the quantification on the occurrence of hillslope type debris flow are also presented in the thesis. Two variables of the discrimination formula were derived from catchment area and catchment length to fulfill the distinction the hillslope type and stream type of debris flow. Debris flow events initiated in the Typhoon Toraji in central Taiwan were examined by the foregoing discrimination formula, and shown the effectiveness. Moreover, the study also proposal a theory that the hillslope debris flow is a transition stage from the gully to the torrent in geomorphology erosion process. Last, the study defines the border on the gully and the torrent and the index of topographic development indicator (TDI) was achieved.