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All Journal Jurnal Teknik Pengairan: Journal of Water Resources Engineering Civil and Environmental Science Journal (CIVENSE)
Azzahra, Arrum
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Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Engineering Environmental Science

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Analysis of Erosion and Land Conservation Based on Geographic Information System in Way Sekampung Subwatershed Azzahra, Arrum; Andawayanti, Ussy; Asmaranto, Runi
Civil and Environmental Science Journal (CIVENSE) Vol. 7 No. 2 (2024)
Publisher : Fakultas Teknik Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.civense.2024.007.02.4

Abstract

Way Sekampung subwatershed is the watershed area of Way Sekampung dam. The changes in land use that occurred in the Way Sekampung subwatershed caused flooding and landslides. To reduce existing problems, vegetative and mechanical land conservation efforts are needed. In this study, the USLE method was used to estimate the rate of erosion and then map the distribution of the Erosion Hazard Index in the Way Sekampung Subwatershed with the help of Geographic Information System (GIS). Based on existing conditions, the erosion rate in 2017 was 29626.262 tons/ha/year; in 2022, the erosion rate was 76617.579 tons/ha/year. The results of the analysis of the Erosion Hazard Index in 2017 and 2022 showed four criteria, namely low with a difference of -1.115%, moderate with an increase of 1.140%, high with a difference of -0.097%, and very high with a difference of 0.071%. Conservation with new land use, construction of terraces, and check dams has resulted in a reduction in erosion in the Way Sekampung Subwatershed with an Erosion Hazard Index, which is a low index increase of 26.992% from the existing condition and a very high 22.819% reduction from the existing condition. These results show that land conservation can reduce erosion in the Way Sekampung Subwatershed.
Spatial Changes of Land Use Using Landsat Data in Banjir Kanal Timur Watershed Semarang City Azzahra, Arrum; Andawayanti, Ussy; Suhartanto, Ery
Jurnal Teknik Pengairan: Journal of Water Resources Engineering Vol. 17 No. 1 (2026): In Press
Publisher : Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.pengairan.2026.017.01.1

Abstract

This study analyzes land use and land cover (LULC) changes in the Banjir Kanal Timur Watershed, Semarang City, from 2004 to 2024, utilizing multi-temporal Landsat data and GIS-based supervised classification methods. This research focuses on a medium-sized tropical coastal city in Indonesia that has received little attention in previous LULC studies, particularly over a two-decade period. The East Flood Canal was selected because of its strategic role and vulnerability to unregulated land-use change, making it an ideal case study to assess the impacts of urban sprawl. The primary objective is to assess the extent of urban growth and its effects on natural land cover, particularly forested areas, water bodies, and brushwood. Using Landsat 7, 8, and 9 satellite imagery, this study applied supervised classification to categorize land cover types and evaluate spatial changes over time. The results indicate a substantial increase in urban and built-up land, from 49.63% in 2004 to 80.57% in 2024, accompanied by a drastic decline in forest cover, from 40.69% to 12.13%, highlighting rapid urbanization and environmental degradation. The classification reliability was validated using a confusion matrix, with overall accuracy exceeding 90% and Kappa statistics ranging from 0.852 to 0.869, indicating substantial to almost perfect agreement. These findings underscore the urgent need for sustainable urban planning, as continued land conversion may lead to increased flood risks, biodiversity loss, and reduced water retention capacity. This research demonstrates the effectiveness of remote sensing in monitoring land use dynamics and offers vital insights for policymakers to create balanced strategies between development and environmental preservation in Semarang City.
Co-Authors Ery Suhartanto Runi Asmaranto Ussy Andawayanti