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All Journal MEDIA KOMUNIKASI TEKNIK SIPIL Jurnal Teknik Pengairan: Journal of Water Resources Engineering Jurnal Teknik Sumber Daya Air Jurnal Teknologi dan Rekayasa Sumber Daya Air Geosfera Indonesia
Setiyowati, Yunita Ayu
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Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Education Energy Engineering Environmental Science

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Journal : Geosfera Indonesia

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Evaluation of Catchment area delineation Methods: Comparison of TOPAZ on WMS with HEC-HMS 4.12 Setiyowati, Yunita Ayu; Harisuseno, Donny; Sajali, M. Amar
Geosfera Indonesia Vol. 10 No. 2 (2025): GEOSFERA INDONESIA
Publisher : Department of Geography Education, University of Jember, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/geosi.v10i2.53253

Abstract

The delineation of catchment areas plays a crucial role in hydrological modeling, influencing water resource management and flood analysis. However, differences in Digital Elevation Model (DEM) resolutions and processing methods can significantly affect the accuracy of delineation results. This study aims to evaluate the differences in catchment area delineation using Hydrologic Engineering Center-Hydrologic Modeling System (HEC-HMS) 4.12 and Watershed Modeling System (WMS) TOPAZ across three DEM resolutions: DEMNAS (8.29 m), ASTER (30 m), and SRTM (90 m). The methodology involves processing DEM data using both software tools, comparing catchment area, main river length, and basin length derived from each resolution. The analysis reveals that higher DEM resolution results in greater similarity between the two methods. At an SRTM resolution of 90 m, the delineated catchment area is 1474.41 km² (WMS) and 1468.03 km² (HEC-HMS), whereas at an 8.29 m DEMNAS resolution, it is 1462.64 km² (WMS) and 1462.91 km² (HEC-HMS). Additionally, significant differences are observed in the main river length, with 44,368.54 m (WMS) and 34,960.17 m (HEC-HMS) at 90 m resolution, and 58,195.71 m (WMS) and 42,537.38 m (HEC-HMS) at 8.29 m resolution. These findings highlight the importance of selecting an appropriate DEM resolution to ensure accurate and consistent hydrological delineation.
Evaluation of Catchment area delineation Methods: Comparison of TOPAZ on WMS with HEC-HMS 4.12 Setiyowati, Yunita Ayu
Geosfera Indonesia Vol. 10 No. 2 (2025): Geosfera Indonesia
Publisher : Department of Geography Education, University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/geosi.v10i2.53253

Abstract

This research evaluates the results of the Jatigede Dam Catchment area delineation using two different methods, HEC-HMS 4.12 and WMS TOPAZ, by utilizing three Digital Elevation Model (DEM) resolutions: DEMNAS 8.29 m, ASTER 30m, and SRTM 90 m. The analysis results show that the higher the DEM resolution used, the greater the resulting area similarity between the two methods. At an SRTM resolution of 90 m, the resulting Catchment area is 1474.41 km² (WMS) and 1468.03 km² (HEC-HMS ). At 30 m ASTER resolution, the resulting Catchment area is 1467.88 km² (WMS) and 1465.03 km² (HEC-HMS ). Meanwhile, the DEMNAS resolution of 8.29 m shows a Catchment area of 1462.64 km² (WMS) and 1462.91 km² (HEC-HMS ). Significant differences in results are seen at lower DEM resolution, especially in the aspect of main river length and basin length, which is caused by limitations in topographic representation. At an SRTM resolution of 90 m, the resulting length of the main river is 44368.54 m (WMS) and 34960.17 m (HEC-HMS ), while at a DEMNAS resolution of 8.29 m the length of the main river reaches 58195.707 m (WMS) and 42537.38 m (HEC-HMS ). These findings emphasize the importance of choosing the right DEM resolution to achieve accurate and consistent delineation results, especially in hydrological applications.
Co-Authors Donny Harisuseno Ernanda, Erwin Indra Kurniawan Lutfi M. Amar Sajali Sholichin, Moh Tri Budi Prayogo, Tri Budi