Landslides affecting sedimentary characteristics of reservoir basin |
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| Authors: | Chien-Yuan Chen Lien-Kuang Chen Fan-Chieh Yu Sheng-Chi Lin Yu-Ching Lin Chou-Lung Lee Yu-Ting Wang |
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| Institution: | (1) National Chiayi University, No. 300, Syuefu Rd., Chiayi City, 60004, Taiwan;(2) National Science and Technology Center for Disaster Reduction (NCDR), 9F., No. 200, Sec. 3, Beisin Rd., Sindian City, Taipei County, 23143, Taiwan;(3) National Chung Hsing University, No. 250, Kuo Kuang Rd., Taichung, 402, Taiwan; |
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| Abstract: | Typhoons Aere (2004) and Matsa (2005) caused high nephelometric turbidity in the Shihmen reservoir in northern Taiwan, jeopardizing
the operation of the reservoir for several days, and ultimately impacting the living conditions and economy of the downstream
residents. The torrential rains caused landslides and debris flows in upland areas, and flowed into riverbeds, likely contributing
significantly to the suspended sediment yields in the reservoir. This investigation elucidates how upland landslides affect
sediment attributes in the reservoir basin. Study methods including field observations, spatial analysis in GIS and aerial
photo interpretation are adopted to trace the sediment sources and contributing factors to the landslide. Torrential rains
induced landslides and debris-flows upland, causing river incisions and soil erosion in landslide areas lacking vegetation.
These factors, together with the conditions of the engineered structures and geologic vulnerabilities of the area, caused
suspended sediment yield in the reservoir. The high nephelometric turbidity could potentially reoccur, with masses of landslide-derived
sediment remaining upland and in the riverbed. |
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