Analisis Laju Sedimen Berdasarkan Data Unsteady Flow Real Time Dengan HEC-RAS di DAS Bomo Banyuwangi

Habib Marjun Syafaat; Yohanes Pracoyo Widi Prasetyo; Heri Sujatmiko; Dimas Aji Purnomo; Zulis Erwanto

doi:10.52158/jaceit.v6i1.1114

Habib Marjun Syafaat Universitas 17 Agustus 1945 Banyuwangi
Yohanes Pracoyo Widi Prasetyo Universitas 17 Agustus 1945 Banyuwangi
Heri Sujatmiko Universitas 17 Agustus 1945 Banyuwangi
Dimas Aji Purnomo Universitas 17 Agustus 1945 Banyuwangi
Zulis Erwanto Politeknik Negeri Banyuwangi; Institut Teknologi Sepuluh Nopember Surabaya

DOI: https://doi.org/10.52158/jaceit.v6i1.1114
I will put the dimension here

Keywords: Sedimentation, Unsteady Flow, HEC-RAS, Bomo Watershed, Flood Mitigation

Abstract

The 2018 flash flood in Banyuwangi Regency highlighted the role of sedimentation in increasing disaster risks. This study aims to analyze sedimentation rates based on real-time unsteady flow data during the rainy and dry seasons, understand the relationship between unsteady flow and sedimentation, and evaluate the role of HEC-RAS in mitigating sedimentation-related risks. Hydrometric measurements were conducted in real-time over seven days in both seasons. Data were analyzed using HEC-RAS and validated using the Mean Absolute Error (MAE) method of bathymetric measurements. The results show that sedimentation rates were higher during the rainy season (2.77 m³/day) compared to the dry season (1.33 m³/day) due to increased discharge and flow velocity. Flow velocity correlates more strongly with sedimentation than discharge, with regression values of 0.8257 in the dry season and 0.4072 in the rainy season. Flood modeling with HEC-RAS indicates that sedimentation increases flood risks, particularly in downstream areas. Therefore, mitigation measures such as river normalization, embankment construction, drainage optimization, and upstream soil conservation are necessary. These findings also support early warning systems to enhance community preparedness for sedimentation-induced floods.

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