Journal of Tropical Oceanography ›› 2020, Vol. 39 ›› Issue (4): 13-24.doi: 10.11978/2019076CSTR: 32234.14.2019076

• Marine Hydrology • Previous Articles     Next Articles

Impact of tides and winds on currents in the Malacca Strait

Jinxiao FAN1(), Song HU1,2,3()   

  1. 1. Marine Ecosystem and Environmental Laboratory, College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China
    2. National Oceanic Fisheries Engineering Research Center, Shanghai 201306, China
    3. Shanghai Engineering Research Center for Estuarine and Oceanographic Mapping, Shanghai 201306, China
  • Received:2019-08-24 Revised:2020-01-21 Online:2020-07-20 Published:2020-07-27
  • Contact: Song HU E-mail:154842967@qq.com;shu@shou.edu.cn
  • Supported by:
    Foundation item: Physical Oceanography and Investigation Project of Shanghai Ocean University(D-8002-14-8001)

Abstract:

A high-resolution hydrodynamic numerical model of the Malacca Strait and its adjacent sea was established using the unstructured Finite-Volume Community Ocean Model (FVCOM). The residual circulation structures and water transport caused by tides and winds were studied. The results show that the movements of tidal currents in the middle channel of the Malacca Strait are dominated by rectilinear currents with rotary currents at the edge, and that the velocities of ebb tides are slightly larger than those of flood tides in the main study domain. The southeast narrow channel is the region with the largest velocities of currents. The tidal currents show multiple convergence and divergence due to the great changes of topography, with three major residual circulations in the Malacca Strait. Forced by the idealized northeast monsoon used in the model, the currents in the Malacca Strait flow to the northwest, while the situation during the southwest monsoon is reversed. During the monsoon period, the residual circulation in the surface layer is destroyed, but still exists in the bottom layer; and as the wind becomes stronger, the number, size, shape, and position of the residual circulation in the bottom layer change. During the inter-monsoon period, the residual current structures change partly during spring tide, but significant change occurs during neap tide under the effect of winds.

Key words: Malacca Strait, tidal current, residual current, FVCOM, monsoon

CLC Number: 

  • P731.21