Abstract:
Geomorphometry identification of the Topographic Wetness Index and Terrain Ruggedness Index has been carried out in the Riam Kanan watershed to determine the type and distribution and its relationship with landforms and land use. The material used in this study is imagery SRTM (30 m) and Google Earth imagery. The research process begins with secondary data collection, the next process is the interpretation of image SRTM imagery in order to obtain landform maps, interpretations of Google Earth imagery in order to obtain land use maps, correlate 30 m SRTM images through digital processes to classify the Terrain Ruggedness Index (TRI) and Topographic Wetness Index (TWI). The final process is data analysis by overlaying landform maps, land use with TRI and TWI. The results of the research data have obtained an area of 116,650.03 ha out of 13 types of distribution of landforms dominated by structural mountains which are quite extensive with 38,200.08 ha while land use consists of 8 types of distribution dominated by forest areas with an area of 88,070.15 ha. The results of the TWI analysis were dominated by class 1 (dry) with an area of 80,193.87 ha while TRI was dominated by class 3 (medium) with an area of 66,400.64 ha. Both TWI and TRI contained in landforms and land use are dominated by structural mountainous landforms which are quite insignificant and use of forest land.
