DEM and GIS analysis of geomorphic indices for evaluating tectonic activity of Phetchabun province
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Abstract
Phetchabun province, central Thailand is vulnerable to various geohazards, with the potential for significant harm to people and property. Phetchabun province has many lineaments that is a source of tectonic activities. In this study, terrain analysis techniques are used in order to determine geomorphic indices related to tectonic activity. we evaluate active tectonics using 30 meters resolution Digital Elevation Model (DEM) data, and a total of 38 drainage basins were extracted using ArcGIS software. we derived drainage network and geomorphic indices: stream-length gradient (SL), mountain front sinuosity (Smf), hypsometric integral (HI), hypsometric curve (HC), basin shape index (Bs). According to the result, the SL index is calculated in percentage on stream which selected 90 to 100 percentage to represent anomalous values. The Smf index computed for 207 lineaments. Most of lineaments has been supported the low active tectonics of the area. The HI values changes between 0.06 to 1.00. High value of HI indicates less impact from tectonic activity which has been found in the western and southern of the study area, The HC has 3 classes; results show most drainage basins in concave curves. The high value of Bs found in most drainage basins that are related to high tectonic activity. Additionally, the geomorphic indices are significantly affected by lithology especially sedimentary rocks that most found in the study area and structure geology.
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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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