1 | | The Soil-Water Characteristic Curve for Residual Soils Formed from Shale |
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2 | | The Influence of Topography and Geology on Sedimenta- tion in the Upstream Area of Kao-Ping Catchment |
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3 | | Characteristics of the Landslides in Shenmu Watershed in Nantou County 43(3):214-226Su-Chin Chen Shao-Chien Chen Chun-Hung Wu** Corresponding Author. E-mail : chwu@mail.nchu.edu.tw Show preview | PDF( 10.45MB ) | Characteristics of the Landslides in Shenmu Watershed in Nantou County | Close | Su-Chin Chen Shao-Chien Chen Chun-Hung Wu* | AbstractLandslides are the main reason for the serious debris flow disaster events in Shenmu watershed. The geology of Shenmu is sandstone and shale, making it fragile. The Chichi
earthquake in 1999 and the following long-duration rainfall with a duration over 12 hrs or high intensity rainfall with a mean rainfall intensity over 30 mm/hr were the main reasons for the serious landslide events in Shenmu watershed. The rainfall-induced landslides are mainly located in the down-hillslope due to scouring by flooding. The total area of the down-hillslope landslide is eight
times larger than that of the up-hillslope landslide in the landslide event following Typhoon Morakot in 2009 with accumulated rainfall of 1628 mm in 48hrs. Further, 7 large landslide cases with a landslide area > 10ha, including 2 old landslide cases and 5 new landslide cases, in Shenmu watershed were also induced after Typhoon Morakot in 2009. Typhoon events with long-duration rainfall or high intensity rainfall are the main reasons for the landslide events in Shenmu watershed, and the landslide ratio has an increasing trend based on the analysis of the heavy-rainfall events in recent years.
Key Words : Shenmu watershed, long-duration high-intensity rainfall, large landslide. | Department of Soil and Water Conservation, National Chung Hsing University, Taichung, Taiwan, R.O.C. * Corresponding Author. E-mail : chwu@mail.nchu.edu.tw | Received: 2011/08/05 Revised: 2011/11/22 Accepted: 2012/01/11
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4 | | The Relationships between Earth Surface Processes and Meandering Forms along the Catchment of the Jhuokou River |
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5 | | Evaluation of the Influence of Fugitive Dust Emissions from Da-An Riverbed on Nearby Regions |
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6 | | Hydraulic Analysis of Water Flow Passing over Vegetated Areas under a Uniform Rainfall |
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7 | | Steady Motion of Bingham Fluid Contained Between Two Concentric Cylinders |
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8 | | Preliminary Study on Soil Erosion Caused by Rainfall in Shenmu Watershed |
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