Human Impact on Geomorphic Index Alteration at the Chi River in Kosum Phisai, Maha Sarakham, North-eastern Thailand
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Abstract
This paper investigates the impact of human interventions on geomorphic index alteration, especially the effect of sand mining on the floodplain of the Chi river (8.5 Km long) at Kosum Phisai district, Maha Sarakham province, north-eastern Thailand. Four geomorphic indexes, including sinuosity index, channel width, widening rate, and migration rate, were measured and analyzed in five different periods: A.D. 1952, A.D. 1992, A.D. 2006, A.D. 2015 and A.D. 2020. As a result, the widening rate of sand mining area dramatically increased from -0.15 m/year in period A.D.1992 to 2006 (before sand mining) to 16.98 m/year in period A.D. 2006 to 2015 (after sand mining operated). Migration rate also changed from 0.37 m/year in period A.D. 1992 to 2006 to – 9.05 m/year (mid channel migrated to right bank) in period A.D. 2006 to 2015. Both alterations confirm direct human intervention to the river. Our analysis also suggests that river bank protection only reduced the widening rate.
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Copyright © 2008 Department of Geology, Faculty of Science, Chulalongkorn University. Parts of an article can be photocopied or reproduced without prior written permission from the author(s), but due acknowledgments should be stated or cited accordingly.
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