Beach Morphological Dynamics at Cocos Bay (Manzanilla), Trinidad

Darsan, Junior

doi:10.4138/atlgeol.2013.008

Cited by 9 publications

(2 citation statements)

References 18 publications

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“…On Full Moon phase, the beach volume result showed a substantial gain in sediment during premonsoon compared to New Moon phases during pre-monsoon (Oct 20-Mac 21). Our ndings diverged from prior research, which associated beach erosion with Full Moon phase due to rise of wave energy and tidal ranges (Banno & Kuriyama, 2020b;Darsan, 2013). The interplay of these natural physical forces, such as waves, tides, and winds, alongside the seasonal monsoonal variations, underscores the complex and dynamic nature of coastal processes in the studied region.…”

Section: Seasonal Monsoonal Variation Effects On Beach Volume Dynamicscontrasting

confidence: 90%

Seasonal Variability On Cross-shore Profile in Meso-tidal Settings Due to Lunar Cycle Effects in Kuala Terengganu Coast

Harris,

Nadzri,

Yusof

et al. 2024

Thalassas

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Kuala Terengganu, one of the coastal zones in Malaysia, is prone to natural hazard factors, such as coastal erosion. The impacts of coastal erosion alternate the morphological structure of the beach in Terengganu. The beach morphological changes were driven by the seasonal monsoon such as Northeast Monsoon (NEM) and Southwest Monsoon (SWM) season. Hence, to understand the short-temporal morphological response of meso-tidal beaches during spring tide events throughout the lunar cycle phase, the study was investigated in Batu Buruk beach, Kuala Terengganu. The tidal cycles, particularly during spring tide (Full Moon and New Moon phases) were collected from ve transects starting on October 2020 to October 2021. The monitoring of cross-shore was conducted by using RTK to measure the cross-sectional area and sediment volume changes. The data collected were computed by using pro ler 3.2XL software. Numerical modelling such as MIKE-21 was used to simulate tidal elevation within the period of this study. The study showed signi cant impact by the lunar cycle on sediment gain and loss. The cross-sectional analysis revealed positive sediment gains during the Full Moon. However, the New Moon erosion seemed to take place around the upper swash zone area. This provides an insight into the spring tide and contributes to beach recovery processes.

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Section: Seasonal Monsoonal Variation Effects On Beach Volume Dynamicscontrasting

confidence: 90%

Seasonal Variability On Cross-shore Profile in Meso-tidal Settings Due to Lunar Cycle Effects in Kuala Terengganu Coast

Harris,

Nadzri,

Yusof

et al. 2024

Thalassas

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“…Erosion and accretion rates depend on the amount of sediment available within the littoral cell. The mean grain size depends on; the type of sediment, wave energy and beach slope (USACE, 2006;Darsan, 2013a). Dissipative beaches are characterized by finest sediment and highest wave energies, while the reflective beaches contain coarser sediment and lower wave energies (Darsan, 2005(Darsan, , 2013bMasselink & Hughes, 2003).…”

Section: Introductionmentioning

confidence: 99%

The Impact of Makeshift Sandbag Groynes on Coastal Geomorphology: A Case Study at Columbus Bay, Trinidad

Darsan¹,

Alexis²

2014

ENRR

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Coastal erosion threatens coastal land which is an invaluable limited resource to Small Island Developing States (SIDS). Columbus Bay, located on the southwestern peninsula of Trinidad, experiences high rates of coastal erosion which has resulted in the loss of millions of dollars to coconut estate owners. Owing to this, three makeshift sandbag groynes were installed in the northern region of Columbus Bay to arrest the coastal erosion problem. Beach profiles were conducted at eight stations from October 2009 to April 2011 to determine the change in beach widths and beach volumes along the bay. Beach width and volume changes were determined from the baseline in October 2009. Additionally, a generalized shoreline response model (GENESIS) was applied to Columbus Bay and simulated a 4 year model run. Results indicate that there was an increase in beach width and volume at five stations located within or adjacent to the groyne field. The GENESIS model confirmed accretion within the groyne field and indicated a reduction in transport rates between groynes when compared to the rest of the bay to within 77.56% accuracy. This study revealed that the makeshift groynes though improperly engineered, has reduced coastal erosion by encouraging accretion. The GENESIS model can be a helpful tool to inform management decisions at Columbus Bay and other beaches and bays inTrinidad and Tobago.

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