Physics Of Coral Reef Systems In A Shallow Tidal Embayment
The study revealed that the key issues determining the delicate subsistence of shallow-water reefs in the Bay of Banten include mixing in the freshwater source region, the seasonal coupling between coastal processes and local resuspension of sediment. The topography-controlled mixing of small river discharges with the ambient marine waters inhibits the direct exposure of coral reefs to river-derived sediment suspensions, high nutrient loads and low salinity. The reefs near the coast benefit from relatively strong currents in front of an abandoned delta, which hydrodynamically acts like a coastal headland. Due to a seasonal coupling between river discharge, wind-driven throughflow and wave attack on the eroding delta, coral reefs in the Bay of Banten are protected from prolonged inundation by high-turbidity water masses that originate from the eroding delta. Local currents that induce resuspension of sediment at the reef slopes are the main control on turbidity variation in the waters that surround the coral reefs. Sediment that is already available may be resuspended and deposited repeatedly, which limits the role of regional advection of sediment. Backscatter data from an Acoustic Doppler Current Profiler (ADCP) have provided a valuable measure of suspended sediment concentration, revealing the spatial structure of sediment clouds connected to the reefs. The analysis of tides in the Bay of Banten gave cause for a general study on the asymmetry of sediment transport in mixed diurnal ? semidiurnal tidal regimes. In these regimes, tidal asymmetry is not only caused by nonlinear tidal interaction, but is also generated by astronomical tides in absence of shallow-water effects.
|B1003920||551.351.5 HOI p||Archivelago Indonesia Marine Library - Perpustakaan Kementerian Kelautan dan Perikanan||Available|
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