Impact of Debris and Non-Debris Flow in Flood Damage at River Confluence, Case Study of Miu-Tuva River Confluence

¹ Magister Study Program of Water Resources Management, Faculty of Civil and Environmental Engineering, Bandung Institute of Technology, Jl. Ganesha 10, Bandung, West Java Province, 40132, Indonesia
² Water Resources Engineering Research Group, Faculty of Civil and Environmental Engineering, Bandung Institute of Technology, Jl. Ganesha 10, Bandung, 40132, Indonesia
³ Water Resources Expert PJSA, Balai Wilayah Sungai Sulawesi III Palu
⁴ Water Technic Faculty of Singaperbangsa Karawang University, Karawang, Indonesia
⁵ Civil Engineering. Dept., Faculty of Engineering, South Valley University, Qena 83523, Egypt

Abstract

Hydrodynamic flow is the flow and its properties that move in a natural or artificial condition. While in natural conditions, the flow event that often occurs in the flow of water by carrying material particles with various gradation sourced from the catchment area. The large concentration of material in a body of water will influence the shape of the river’s cross section for a certain period of time until it reaches an equilibrium condition. The purpose of this paper is to determine the hydrodynamic pattern that occurs at the confluence of the Miu River and Tuva River which is caused by fluid flow in non-debris (Newtonian) and debris flows (Non-Newtonian) so that control of the destructive power of water in the river can be optimized. The velocity of non-newtonian flow (debris) is lower than that of newtonian flow (water) because the viscosity of non-newtonian flow (debris) is higher than that of newtonian flow. On the other side, with the incoming discharge flow from the tributary, the velocity at the river cross section tends to increase on the far side of the direction of the incoming tributary flow.