Comparison of River Stability using 2D HEC-RAS Newtonian and Non-Newtonian Flow Modelling (Case Study: Design of Sabo Dam in the Namo River Basin, Sigi Regency, Indonesia)

Abstract

River stability is a crucial factor in assessing and managing risks associated with natural disasters, such as debris flows. This study compares river stability using two-dimensional (2D) HEC-RAS modeling with both Newtonian and Non-Newtonian flow approaches. Typically, non-Newtonian flow models are used for modeling debris flows. However, this study examines how the differences in modeling using Newtonian and non-Newtonian flows affect the potential for debris and the stability of the river system. The study focuses on the Namo River located in Sigi Regency, Indonesia, which is prone to debris flow events. In order to mitigate debris flows in the Namo River, three Sabo Dams and one Consolidation Dam have been built. The conditions before and after the construction of the Sabo Dam and the Consolidation Dam will also be modeled in this study. By comparing the results obtained from these modeling techniques, the study aims to provide a comprehensive understanding of river stability and improve the accuracy of debris flow prediction. The findings from this study have significant implications for the management and planning of the Namo River and similar river systems, enabling effective measures to minimize the potential risks associated with debris flow events.