Numerical Model Study of Coastal Profile Dynamics due to Pandanus Shrubs Protection

EasyChair Preprint 15070, version 2

Abstract

There is a growing interest in nature-based coastal protection as an alternative to conventional hard-coastal protection measures. This research is a numerical model investigation on the role of vegetative protection provided by coastal vegetations (Pandanus tectorius) on the evolution of beach face and backshore, focusing on the dynamic of slope profile changes due to wave actions. The study provides a unique opportunity to analyse natural erosion occurrence, which includes the scouring of beach face and subsequent erosion of the backshore. A research study has been conducted based on field observation, laboratory scale model test and numerical model simulation. This paper will present development of numerical model simulation using FLOW-3D computational fluid dynamics (CFD) software utilizing multi physics -fluid and sediment- approach. While the physical model results and its comparison with numerical simulation and field observation will be presented in a separate publication. The role of coastal vegetation (Pandanus) is simulated using a fluid-structure interaction. The results indicated that coastal vegetation reduced wave steepness by 10% (from 0.0020 to 0.0018), significantly dissipating wave energy. Furthermore, vegetated areas exhibited a 14.37% reduction in erosion and a 4.65% increase in sediment accumulation compared to non-vegetated areas, with a net sediment elevation change of 0.25 meters in vegetated areas versus a 1.74-meter loss in non-vegetated areas. These findings support the Integrated Coastal Zone Management (ICZM) approach, offering valuable insights for the design of resilient and sustainable coastal areas. Nature-based solutions like vegetative protection provide an effective alternative to traditional methods, promoting both environmental and economic benefits for coastal management strategies.

Keyphrases: ICZM, Slope profile dynamics, coastline, erosion control

@booklet{EasyChair:15070,
  author    = {Oki Setyandito and Nizam Nizam and Benazir and Muhammad Hafiz Aslami and Andrew John Pierre and Alfaldo Branoyasensa Baria},
  title     = {Numerical Model Study of Coastal Profile Dynamics due to  Pandanus Shrubs Protection},
  howpublished = {EasyChair Preprint 15070},
  year      = {EasyChair, 2024}}