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Predicting the time and location for shallow landslide occurrence －A case study for Da-Tsu-Ken watershed
|Authors: ||Jui-Yi Ho|
|Contributors: ||NTOU:Department of Harbor and River Engineering|
landslide prediction;hydrological model;slope instability analysis
|Issue Date: ||2011-06-30T07:36:45Z
The topographic, geological and hydrologic conditions of Taiwan usually induce landslide and debris flow during heavy rainstorms. Poor geological conditions induce a high potential to cause hillslope disasters, and severe rainstorms often trigger slope collapses. The objective of this study is to link a slope-instability analytical procedure to a watershed runoff model for landslide prediction during heavy rainfall periods. The analytical result can provide location and time for shallow landslide occurrences to authorities for disaster warning and evacuation. In this study, hydrologic records and geological information from the Da-Tsu-Keng watershed in Taipei County were collected for analysis. By using the hourly rainfall data, the varying of the water table on the hillslope was simulated using a hydrological model, and the temporal water level was then used in the slope instability analysis to predict instability grids within the study areas. The results show that more than 50% area of the study subwatershed was considered having potential for landslide occurrence during a severe typhoon in November 2000. The predicted landslide region and occurrence time matched well with the field investigation data. It is therefore considered promising to apply the proposed analytical procedure for real-time landslide warning to alleviate the loss of lives and property.
|Appears in Collections:||[河海工程學系] 博碩士論文|
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