Designing a Multistage Flood Control Channel for Sediment and Flow Management in Coastal Areas
Tiny Mananoma, Jeffry S. F. Sumarauw, Roski Rolans Izack Legrans, Yosua Aditya Ratu
Abstract
Flow and sediment are the two main parameters that significantly influence the flood. Flooding results in riverbed degradation, adversely affecting the construction of the river and the environment. Therefore, it is essential to engineer the profile of the flood control channel in the selected area of Likupang Pulisan Beach. This research seeks to develop a design that mitigates the adverse effects caused by flooding and sediment movement, resulting in geological and ecological disasters. The amount of rainfall and watershed characteristics become input data in the HEC-HMS application to obtain the amount of planned flood discharge. Measurement and mapping of river geometry were conducted. This data is used in the HEC-RAS application, which will simulate flow conditions in the field in real time. From the analysis of the flood control channel profile engineering, the dimensions of a multi-stage trapezium channel with top width (La) = 10 m, bottom width (Lb) = 1 m, and height (h) = 3 m were obtained, which can drain a flood discharge of 36.5 m³/s. The novelty of this research is the design of a multilevel channel profile that is implemented in a tourist area with the aim of flood control.