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Oceanographic Study in the Strait of Hormuz and over the Iranian Shelf in the Persian Gulf.

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Final rept.,

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Two limited oceanographic investigations were performed in the Persian Gulf, one to a location approximately 200 km west of the Strait of Hormuz in May 1976 and the other to the Strait of Hormuz in April 1977. In May, inflow from the Arabian Sea and the Gulf of Oman is detected at a point about 200 km inside the Persian Gulf and is found over the shelf off the Iranian coast within about 50 km from the shore. Adherence of the inflow to the Iranian coast is due to Coriolis deflection. In the upper 30 meters of this shelf, the surface water essentially retains the characteristics of the unmixed surface water originating in the Gulf of Oman. However, the water at a 30-m depth has been mixed partially with underlying denser and cooler water in the Persian Gulf. There are indications of progressively stronger mixing action with distance offshore. Temperature of the inflow appears to rise 5 to 7 c while travelling a 200-km distance from the Strait to the study location off Kish Island. The direction of the currents in this inflow off Kish Island was opposed to the anticipated general northwest trend at the time of this study. This is considered to indicate that, during May, inflow is not sufficiently strong to overcome the opposing effects of local winds. The average speed in the surface 30m at this location was 0.38 knot. In the southern half of the Strait of Hormuz, the water was stably stratified, consisting of three distinct water masses, Salinity and temperature extremes generally exceeded historically reported data.

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  • Physical and Dynamic Oceanography

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