Analisis Tingkat Bahaya Erosi Menggunakan Metode Universal Soil Loss Equation (USLE) Area Pasca Tambang Pit H3, Kecamatan Sambaling, Kabupaten Berau

Authors

DOI:

https://doi.org/10.32832/komposit.v10i2.22879

Keywords:

Universal Soil Loss Equation (USLE), post-mining, land erosion, land conservation

Abstract

Post-mining activities often leave open land highly vulnerable to erosion. This study aims to analyze the erosion hazard level in the post-mining area of Pit H3, Sambaliung District, Berau Regency, using the Universal Soil Loss Equation (USLE) method supported by Geographic Information Systems (GIS). Rainfall erosivity (R) was calculated from Binungan Station rainfall data (2012–2021) and projected to 2030 using the Thomas Fiering stochastic model, showing an increase from 2,022 to 2,379 m·ton·cm/ha·year. In terms of soil erodibility (K), Alluvial soils (K = 0.47) were found to be more prone to erosion compared to Latosol and Litosol soils (K = 0.36) due to higher silt content and lower organic matter. The LS factor indicates that 13% of the area has steep slopes (>25%) and 0.4% very steep slopes (>40%), accelerating surface runoff. Meanwhile, CP factors reveal that most of the area is dominated by secondary forest (52%) and primary forest (25%) with low CP values, although shrubs (6%) and open land (3%) remain significant contributors to local erosion. USLE results show that 87% of the area falls into the very low hazard class, while 2% is categorized as very high hazard. The estimated erosion rate is 48,797.32 tons/year (101.81 tons/ha/year), which can be reduced to 23,540.83 tons/year (49.11 tons/ha/year) through advanced conservation measures. With a catchment area of 4.79 km², the Sediment Delivery Ratio (SDR) was calculated at 25.6%, producing a sediment yield (SY) of 12,493.1 tons/year under current conditions and 6,033.5 tons/year under conservation. Considering the storage capacity of Pit H3 void at 4,800,000 m³ (≈6,240,000 tons), its lifespan is estimated at 500 years under current conditions and could extend to 1,034 years with conservation measures. These findings highlight the importance of sustainable land conservation to control erosion and maintain function of the void as a long-term sediment pond.

 

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Published

2026-08-04

How to Cite

Ikhsan, L. N., Irwan, A., Ilham, I., Taqwa, F. M. L., & Salman, N. (2026). Analisis Tingkat Bahaya Erosi Menggunakan Metode Universal Soil Loss Equation (USLE) Area Pasca Tambang Pit H3, Kecamatan Sambaling, Kabupaten Berau. Jurnal Komposit: Jurnal Ilmu-Ilmu Teknik Sipil, 10(2), 263–274. https://doi.org/10.32832/komposit.v10i2.22879

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Vol. 10 No. 2 (2026)

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