Article Published In Vol.8 (Jan-Feb-2020)

Application of Geographical Information Systems in the study of Morphometric Characteristics of the Progo-Opak River Watershed Area in Yogyakarta, Indonesia

Author : Anas Awad and Nurul Khotimah

The study aims to harness and utilize the technology of geographic information systems in extracting Morphometric characteristics of the Progo-Opak river watershed area in Yogyakarta relied on the analysis of a digital elevation model for the basin area of the SRTM satellite, with an accuracy of up to 90 meters. The study aimed to derive the water basins and the river network of Progo-Opak river watershed area through the DEM images using Arc GIS10.5, Arc hydro program. There is Four main aspects: Relief aspects, Linear aspects, Areal parameters, Drainage texture analysis. It was noticed that the Progo-Opak river watershed area from the fifth order according to the Strhles classification, while the total number of streams in opak river (354) and (437) for progo. The results showed the opak River where it tends to be oval according to the classification. And showed in progo river where it tends to be elongated according to the classification. The study shows the drainage density was in the area of the opak- progo river watersheds (0.71 km/km2 in opak) and (0.77km/km2 in progo), This value is considered very low, according to the (Strahler1964) classification. The study also showed that there is little chance of floods in the study area, except in some places in the estuarine areas. The study achieved the objectives is to evaluate various morphometric parameters of the study area using GIS tools, by establishing and adopting a database of Morphometric characteristics, establishing accurate digital maps to the basin area.
Keywords: Drainage · GIS · Progo-Opak River Watershed Area · SRTM DEM · Morphometry. Stream