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Coral reefs act as natural barriers and protect the shorelines of islands and land masses against natural calamities. The natural parameters such as light, temperature, salinity and settlement of silt influence the growth of corals. Siltation is one of the major factors influencing the growth and survival of corals. South east coast of India consist of rich diversity of coral reefs are influenced by A both southwest and northeast monsoons. Sedimentation rateis calculated from the selected study sites of Palk Bay and Gulf of Mannar reef ecosystem is between the 14.6 and 38.54 mg.cm-d. And the sedimentation rate of Palk bay and Gulf of Mannar is compared and found that,the sedimentation rate of the Palk Bay is ~2 times higher than that of Gulf of Mannar. The model predictions also clearly indicating that the suspended sediments due to high magnitude of coastal currents will allow the deposition of suspended mud on the coral environment. Significant Positive correlation of the model predicted sedimentation value with the collected value is observed from regression equation. Biophysical status of corals and its associated life-form communities (mean cover %) of the corresponding study sites are assessed.Due to high sedimentation rate, the corals presented in Gulf of Mannar and Palk Bay are negatively impacted in the present study (r = -0.47), which requires continuous monitoring in both physical (Sedimentation rate) as well as biological status(Ground truthing on coral reef cover) of the coral reef.

Sediment Transport Rate and its Impact on Coral Reef Health – Palk Bay and Gulf of Mannar