Impact of Debris Flow on River Morphology using HEC-RAS 6.4.1 in Miu River, Sigi Regency, Central Sulawesi Province Gading Komala Pramesi (a*), Joko Nugroho (b), Isnaeni Mudi Hartanto(c)
a) Magister Study Program of Water Resource Management, Faculty of Civil and Environmental Engineering, Bandung Institute of Technology.
b) Water Resources Engineering Research Group, Faculty of Civil and Environmental Engineering, Bandung Institute of Technology
c) Ministry of Public Works and Housing, Republic of Indonesia
Abstract
On September 28, 2018, a devastating earthquake with a magnitude 7.5 struck approximately 80 km North of Palu City in Central Sulawesi. The landslides triggered by the earthquake, tsunami, liquefaction. Landslides had a profound impact on local communities, economic, and infrastructure. There are many large-scale slope failures and debris flow in the Miu River basin. Accurate prediction of debris flow impact on river systems is essential for effective hazard assessment and mitigation planning. This paper focuses on a flow modeling techniques in HEC-RAS software for predicting debris flow. The data used are rainfall data, geometric, and sediment data. The results indicate that debris flow has significant impacts on river stability. The combined effects of changes in channel morphology, bed stability, and bank erosion can disrupt the equilibrium of the river system and compromise its overall stability. One potential strategy to reduce debris flow in the Miu River is construction of a consolidation dam. Consolidation dam is designed to trap and retain debris materials, preventing them from being transported downstream. This will contribute to the preservation of the river ecosystem, the protection of infrastructure, and the well-being of local communities that depend on the river for various economic and social activities.
Keywords: Debris Flow, HEC-RAS, River Morphology, Consolidation Dam
