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Analysis on the Sedimentary Environment Change Induced by Typhoon in the Sacheoncheon, Gangneung using Multi-temporal Remote Sensing Data  

Park, No-Wook (Geoscience Information Center, Korea Institute of Geoscience and Mineral Resources)
Jang, Dong-Ho (Research Institute for Military Science, Kongju National University)
Chi, Kwang-Hoon (Geoscience Information Center, Korea Institute of Geoscience and Mineral Resources)
Publication Information
Journal of the Korean earth science society / v.27, no.1, 2006 , pp. 83-94 More about this Journal
Abstract
The objective of this paper is to extract and analyze the sediment environment change information in the Sachencheon, Gangneung, Korea that was seriously damaged as a result of typhoon Rusa aftermath early in September, 2002 using multi-temporal remote sensing data. For the extraction of change information, an unsupervised approach based on the automatic determination of thresholding values was applied. As the change detection results, turbidity changes right after typhoon Rusa, the decrease of wetlands, the increase of dry sand and channel width and changes of relative level in the stream due to seasonal variation were observed. Sedimentation in the cultivated areas and restoration works also affected the change near the Sacheoncheon. In addition to the change detection analysis, several environmental thematic maps including microtopographic map, distributions of estimated amount of flood deposits and flood hazard landform classification map were generated by using remote sensing and field survey data. In conclusion, multi-temporal remote sensing data can be effectively used for natural hazard analysis and damage information extraction and specific data processing techniques for high-resolution remote sensing data should also be developed.
Keywords
multi-temporal remote sensing data; hazard analysis; typhoon Rusa;
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