Rip current occurrence probability at selected recreational beaches along Pahang coastline

Pahang beaches draw more than thousand visitors throughout the year. From the year 2006 to 2018, more than 30 drowning and near-drowning cases were recorded mainly from rip currents. Rip currents define as unexpected current that carried beachgoers away to seaward direction more than ~ 50 meters from shore. The prediction of rip current development is very important for protection of human life. In this study, preliminary survey and field works were carried out to identify rip current hazards. The output would be an early warning preventative mitigation to public in Pahang. Beach state model, dimensionless fall velocity, (Ω), littoral environment observation (LEO) and relative tidal range (RTR) were recorded for five recreational beaches during two different months (March and April 2018). The morphodynamic parameters such sediment fall velocity (Ws), sediment grain size (D50), beach slope are then analysed using software PROFILER. Classification of risks were done based on beach morphodynamic model (Ω-RTR). The morphodynamics are classified as low tide bar rip (LTBR), barred (B), low tide terrace associated with rip current (LTTR), bar dissipative (BD), reflective (R), non-bar dissipative (NBD), low tide terrace (LTT) and ultra-dissipative (UD). Result shows three out of five recreational beaches may develop high risk rip currents. During the first month of survey, Batu Hitam (BH) recorded the only one recreational beach that may develop high risk rip current followed by Teluk Cempedak (TC) and Kempadang (KEM) as middle risk rip current beach while Balok (BA) and Sepat (SEP) as low risk rip current beach. Different during second month of survey, Balok (B), Batu Hitam (BH) and Sepat (SEP) were recorded as high risk rip current beach while Teluk Cempedak (TC) and Kempadang (KEM) as low risk rip current beach. The results are consistent with beach incidents (drowning and near-drowning) reported

Trajectories of floating marine debris along the east coast of Peninsular Malaysia

Marine debris issues have been one of the major problems that every nation is facing around the world Several studies have reported the accumulation of marine debris both in Peninsular and East of Malaysia in terms of its distribution on different places, temporal and seasons effect and the major debris type found on Malaysian coastline. However, the study on route and trajectories of floating debris in Malaysia remains to be accomplished. A numerical approach could be a better view and improve our knowledge on the behaviour and fate of marine debris in our coastline. Particle tracking model was used to provide 1) the possible sources of floating marine debris, 2) the distribution of floating marine debris during different seasons, and 3) the trajectory of marine debris released from our coastline. We use the Lagrangian ocean analysis tool, OceanParcels software as our main framework to simulate and model the particle integrated with ocean circulation model and stokes drift from the GLORYS12V1 and WAVERYS, a reanalysis ocean model and waves by European Center for Medium-Range Weather Forecasts (ECMWF). Particle tracking model shows an acceptable agreement

Modelling approach in assessing and predicting the trajectory and spatial distribution of floating plastic debris in coastal water of East Coast Peninsular

Marine debris issues have been one of the major problems that every nation is facing around the world Several studies have reported the accumulation of marine debris both in Peninsular and East of Malaysia in terms of its distribution on diff erent places, temporal and seasons eff ect and the major debris type found on Malaysian coastline. However, the study on route and trajectories of fl oating debris in Malaysia remains to be accomplished. A numerical approach could be a better view and improve our knowledge on the behaviour and fate of marine debris in our coastline. Particle tracking model was used to provide 1) the possible sources of fl oating marine debris, 2) the distribution of fl oating marine debris during diff erent seasons, and 3) the trajectory of marine debris released from our coastline. We use the Lagrangian ocean analysis tool, OceanParcels software as our main framework to simulate and model the particle integrated with ocean circulation model from the GOFS 3.1, a reanalysis ocean model by Hybrid Coordinate Ocean Model (HYCOM) and Navy Coordinate Ocean Model (NCODA). Particle tracking model and limited in-situ observation data shown a good agreement in terms of validation and results. Results illustrate several possible hotspots of accumulation and sources of fl oating marine debris along East Coast of Peninsular Malaysia

Dynamic Visualization of Beach Morphology in Wave Overtopping over Coastal Structures

Wave overtopping of coastal structures depicts a hazard for community, property, and infrastructure within the vicinity of low land areas. Given the growing threat of climate-change-induced floods, the wave attacks, particularly in Kelantan low-lying areas, can substantially affect the occurrence of wave overtopping at various coastal structures. Hence, a precise prediction of wave overtopping for different coastal structures is essential to protect community and property nearby the coastal structure areas. Smoothed Particle Hydrodynamics (SPH) method using DualSPHysics was conducted to simulate wave overtopping on flow thickness, velocity, and volume discharge. Understanding the complexity of beach dynamics and hydrodynamic characteristics were assessed using Profiler 3.2 XL and MIKE-21 to determine the current beach morphology with existing coastal structures and gain better insights into the dynamic visualization of wave overtopping. The result shows that the variation of the beach morphology throughout the storm event greatly influences the wave flow and velocity, while the wave overtopping discharges are influenced mainly by the defending of coastal structures to impede the wave overtopping water drains discharge inland. This study demonstrates the most desirable choices concerning the effectiveness of coastal structures design and types are profound in coastal erosion and flood management purposes visually and realistically

Modelling Approach in Assessing and Predicting the Trajectory and Spatial Distribution of Floating Plastic Debrisin Coastal Water of East Coast Peninsular Malaysia

Marine debris issues have been one of the major problems that every nation is facing around the world Several studies have reported the accumulation of marine debris both in Peninsular and East of Malaysia in terms of its distribution on diff erent places, temporal and seasons eff ect and the major debris type found on Malaysian coastline. However, the study on route and trajectories of fl oating debris in Malaysia remains to be accomplished. A numerical approach could be a better view and improve our knowledge on the behaviour and fate of marine debris in our coastline. Particle tracking model was used to provide 1) the possible sources of fl oating marine debris, 2) the distribution of fl oating marine debris during diff erent seasons, and 3) the trajectory of marine debris released from our coastline. We use the Lagrangian ocean analysis tool, OceanParcels software as our main framework to simulate and model the particle integrated with ocean circulation model from the GOFS 3.1, a reanalysis ocean model by Hybrid Coordinate Ocean Model (HYCOM) and Navy Coordinate Ocean Model (NCODA). Particle tracking model and limited in-situ observation data shown a good agreement in terms of validation and results. Results illustrate several possible hotspots of accumulation and sources of fl oating marine debris along East Coast of Peninsular Malaysia