| dc.description.abstract | The Chaochou Fault, lying on the easternmost part of the Pingtung plain, is the geologic boundary between the slate belt to the east, and the Western Foothills to the west. According to the previous researches, the Chaochou fault is a high angle reverse fault that dips 75-80 degrees to the east. The fault intersects with many major rivers in the Southern Taiwan. The fault formed a lot of alluvial fans in the Western Foothills, and the distribution of the river seems to be highly related to the activity of the Chaochou Fault. In this study, we uses geomorphic indices to analyze the activity of the Chaochou Fault and the nearby structures.
Topographic maps in different scales, and Digital Terrain Model in 40m resolution that covering the study area were used to study the geomorphic features. Geographic Information System（GIS）is used to data input, management, analysis and display. Geomorphic indices , included Hypsometric Integral, Stream Length-gradient Index, and Drainage Basin Asymmetry, are compared with the bedrock distribution, active structures, and geomorphic features to clarify the the activity of the Chaochou Fault.
The result shows that the characteristic of river landforms is highly related to the activity of the Chaochou Fault. Most of the rivers along the Chaochou Fault in the study area shift to the west. The uplift rate is strong in the northern part of the Chaochou fault and progressively decreases to the South. The higher geomorphic indices suggest that greater tectonic activity occurs between the Chaochou Fault and the Chishan Fault. | en_US |