Quantifying the Temporal Variations and Spatial Distribution in Landslide-Driven Sediment Production by Using Decision Tree at Watershed Scale

Yu-Wen Lin ； Li-Sheng Chou ； Che-Wei Shen ； Yu-Jia Chiu ； Kang-Tsung Chang

《Geotechnical Hazard Mitigations: Experiment, Theory and Practice—Proceedings of the 5th International Conference on Geotechnical Engineering for Disaster Mitigation and Rehabilitation》 2017年 (2017/10) Pp. 347-362

https://doi.org/10.6140/9789864371419.201710.0030

摘要

This research contains 2 parts. First, the study has so far collected 11 annually nationwide landslide inventories from 2004 to 2014. Geographic information system analysis and visualization software Tableau were conducted to analyze the long term trend of landslide ratio (LSR) and to visualize preferred characteristic factors of each basin area in Taiwan. In the decade of 2004 to 2014, the LSR of 10 largest basins in Taiwan generally tend to ascend from less than 1% to more than 2%. While focus on the Kaoping River watershed, where heavily striken by Typhoon Morakot in 2009, the LSR before 2009 was slightly ascending and sharply rose at 2009, then the trend of LSR appears to recovering from high spot until now and indicated the natural LSR recovering period is about 9 to 10 years. Second, this research conduct decision tree (J48) method analyzed 11 event-based landslide inventories from 2001 to 2010 and each 20m raster grid of Kaoping River watershed in southern Taiwan. Decision tree method induct the rules of landslide potential and calculate the sediment volume of each slope unit. With automatic metadata analysis and visualization method, this research provides the authorities intuitive and interactive panel to management real- time probability of landslide and sediment producing of each sub-basin.

關鍵字

Visualization ； Landslide ratio ； Decision tree ； Landslide potential ； Sediment production