July–September
The Southwest Monsoon wind blows at full strength. In many areas, the directions of the surface water currents were from the southwest and the west (Siripong, 1988) with counterclockwise circulation in the Upper Gulf, whereas both clockwise
and counter-clockwise circulations are observed in the Lower
Gulf (Fig. 4).
October–December
This is the transition period from the Southwest to the Northeast Monsoon season. The directions of the surface water