摘要：Geographical Information System (GIS), when applied to active tectonic settings, has been widely used in morphometric analysis as a powerful tool to quantitatively correlate the characteristics of a landform, such as geology, geomorphology, and hydrology characteristics. In this study, GIS is used to study the Krueng Raya watershed, which is comprised of neat-jagged, gentle-steep, and diverse geological features. This study area will be the subject to analyze the watershed and landform characteristics that utilize Digital Elevation Model (DEM) DEMNAS (8m-resolution). Hillshade data extraction from DEMNAS results in low relief mountain (56.11%) and sloping to moderately steep (63.1%), a total subbasins area of 60.3 km2 , a stream length of 178.66 km and upto-4 th -order 294 stream segments of which flow patterns are dendritic, rectangular, and sub-parallel. The geomorphometric variables calculated are areal or basin parameters (drainage density, stream frequency, circularity ratio, and elongation ratio), linear parameters (bifurcation ratio and stream length ratio), and form factor. The outcomes from these parameter calculations are quantitative morphometric showing rough to very rough textures, generally deformed, long sub-basin shape, narrow and elongated basin, and short-moderate frequency segments of stream. These morphometric anomalies are the predominant factors indicating the active tectonics and show geospatial analysis and satellite imagery combined that apply to any kind of drainage basin morphometry.
