ĐÁNH GIÁ CHẾ ĐỘ THỦY ĐỘNG LỰC TƯƠNG PHẢN GIỮA HAI ĐỚI BIỂN VEN BỜ BAO QUANH MŨI CÀ MAU

Abstract

The Ca Mau cape and its arounded coastal zone are forming and growing on the alluvial platform which had been built by Mekong River sediment. It is unique piece stretching out to the southwest to form the Ca Mau Peninsula and making the Vietnamese Mekong Delta had form of strong axial asymmetry. This is due to the great contrasted hydrodynamic regime in the western and eastern coastal seas around Ca Mau Peninsula. This paper will provide assessments of hydrodynamic and wave regimes in the coastal zone around Ca Mau cape and its surroundings by simulations based on the MIKE 21/3 Couple Model FM model that it was well calibrated and validated to cover more information and databases needed for more effective in planning, exploiting and protecting this region. The coastal zone around Ca Mau cape has complex hydrodynamic regime with large spatial and temporal variation due to the water volume has to flow around the strongly convex to the sea and big structure with the huge wide delta front and steep sea bed at foot of vast underwater alluvial. The coastal hydrodynamics in east coast zone is twice more power than that in the west coast zone. There is a distinct seasonal contrast: in the dry season, the east coast of Ca Mau cape is very lively, but the west coast is fact quiet, and vice versa during the rainy season. Especially, there is a sudden decrease in current speed when the water is flowing from the East Sea, arounding Ca Mau cape and comming into the West Sea. It is the main mechanism for forming and developing north mudflat of Ca Mau cape that is named as Ca Mau alluvial flatform.