Modeling of 2D Hec-Ras Simulation on Debris Flow Analysis on Morphological Changes of the Omu River, Sigi Regency, Central Sulawesi

¹ Magister Study Program of Water Resource Management, Faculty of Civil and Environmental Engineering, Bandung Institute of Technology, Bandung, Indonesia
² Water Resources Engineering Research Group, Faculty of Civil and Environmental Engineering, Bandung Institute of Technology, Bandung, Indonesia
³ Ministry of Public Works and Housing, Jakarta, Indonesia

^* Corresponding author: zelandiyp@pu.go.id

Abstract

Landslide is a natural disaster that shows if the soil structure in the area is unstable, where landslides occurred was in the upper part of the Omu River. When there is heavy rain, landslide material in the form of debris is carried into the river flow increasing the concentration of sediment in the river which causes debris flow. Debris flow has a destructive power that can cause damage to buildings, utilities and can threaten the lives of people in the area. This study aims to NonNewtonian method analysis models in the HEC-RAS (2D) 6.4 software. The findings reveal that debris flow has a significant impact on the morphological stability of the Omu River, stability of the riverbed and bank erosion, which can disrupt the overall river system stability. One effective strategy for mitigating the potential risks of debris flow is the construction of the Sabo Dam on the Omu River. This dam is designed to capture and retain debris sediment, preventing it from being carried downstream. By doing so, it helps to maintain the morphological stability of the Omu River, riverbed, and reduce the impact of destructive debris flow forces.