Terrain analysis in Phetchabun province

Abstract

Phetchabun province, lower northern Thailand is vulnerable to geohazards, landslide and flooding with the potential for significant harm to people and property. In addition, Phetchabun province has many lineaments that could be potential source of tectonic activities. In this study, terrain analysis techniques are used through 30 meters resolution Digital Elevation Model (DEM) data in order to determine geomorphic indices related to tectonic activity. The statistic index method (Si) is calculated in relation of six parameters to indicate landslide susceptible area. and the hydromorphometric contrast index (HCI) is used to identify sensitive area to flooding by evaluating five parameters. According to the result, the SL index with 90 to 100 percentage was selected to represent anomalous values. The Smf index, most of lineaments has been supported the low to medium active tectonics. The value of HI indicates less impact from tectonic activity. HC show most drainage basins in concave curves. The Bs index, most drainage basins that are related to medium to high tectonic activity. Additionally, the high and very high classes of landslide susceptibility maps have been situated in the eastern and western area. The high class of flood susceptibility map has been shown in the central and southern area.