| Summary: | 碩士 === 國立屏東科技大學 === 水土保持系所 === 103 === The assessment model of fluidizing landslide was developed in this study since the debris flow was frequently related to the fluidized landslides from gullies or slopes in the catchment. Three debris flow streams which occurred in Typhoon Morakot in Kaoping river basin were studied to develop the assessment model. The process of the analysis unit delineation has established based on the micro topography through the tool of GIS, aero photos, the DEM of morphology, and the field verification. The criterion, the basin area larger than 1.5 hectares with the same outlet of a zero-order basin or slope, was applied to the delineation of analysis unit. A total of 198 analysis units were achieved from three debris flow catchments. Eight factors, including A,B, and C, of discriminant model on fluidizing landslide developed by Yang (2014) was selected in this study. Assessed by discriminant model, three catchments have achieved with 50 potential fluidizing landslide units and 148 slope units. Verified with the 21 real fluidized landslide and 40 general landslide events occurred within three catchments in Typhoon Maroka, the good match rate of 82% was achieved.
Three verification catchment, one debris flow event and two no debris flow events, have been also conducted through the same delineation procedure to explore the relationship between the among of potential fluidizing landslides to the occurrence of debris flow of a catchment. After total of 6 catchments study, 4 occurred and 2 did not occurred, found that the high occurrence probability to the catchment as the area ratio of potential fluidizing landslide larger than 30%.
|
|---|
