Abstract
The factors of the debris flow and debris flood (debris flow-flood) occurrence on 11 August 2001 on the active Nam Ko alluvial fan in Phetchabun province, central Thailand, were studied. Evidences of past activity registered in the alluvial fan, and the debris flow-flood event were reconstructed. The disastrous debris flow-flood event was not the work of the unusual high amount of rainfalls alone, as previously theorized, but is a work of combined factors from the terrain characteristics with specific land covers to the time delay for accumulation of debris and sediments. This combination of factors could lead to a debris flow-flood after a high amount of precipitation. The process could also be worse if a landslide formed a natural dam, then the dam was destroyed under the weight of impounded water. After such a disastrous event, it would take time for more plant debris and sediments in the sub-catchment area to accumulate before the next debris flow-flood.
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Acknowledgements
The Graduate School of Chulalongkorn University and the Ministry of Interior provided a partial funding for this study. Dr. Nopadon Muangnoicharoen of Chulalongkorn University and Dr. Kittitep Fuangkhajorn of Suranaree University of Technology critically reviewed the concepts of this research. The technical supports were provided by the staff of Geo-Informatics Center for Thailand (GISTHAI) of Chulalongkorn University and the staff of Geo-mechanical Research Unit, Suranaree University of Technology.
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Yumuang, S. 2001 debris flow and debris flood in Nam Ko area, Phetchabun province, central Thailand. Environ Geol 51, 545–564 (2006). https://doi.org/10.1007/s00254-006-0351-9
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DOI: https://doi.org/10.1007/s00254-006-0351-9