Study of Longshore Currents in the Amirabad Coast
Subject Areas : Marine Physics
K. Lari
1
(Dept. of Physical Oceanography, Islamic Azad University, North Tehran Branch, Tehran, Iran)
A. Ebrahimi
2
(Dept. of Physical Oceanography, Islamic Azad University, North Tehran Branch, Tehran, Iran)
Keywords: Longshore current, shore steepness, fitted coefficient, Amirabad,
Abstract :
One of the most important effects of wave entrance to the shallow waters and sea bed topography on them in coastal zone is wave breaking phenomenon. This process is a crucial factor in production of cross-shore, rip and longshore currents that are generally introduced as near shore currents. In this research, longshore currents of Amirabad area were considered and then the most appropriate relation was obtained for computation of velocity for these kind of currents. In addition, pattern of the currents were obtained using the field data of waves and currents By using the hydrographic map of the study area and also the slope of the shore and using the data from the buoy in Amirabad station and wave rose fitted coefficient in Amirabad area, velocities of longshore currents were computed in experimental terms. The computed results were then compared (using MATLAB software) with velocities of currents measured by flow meter, to estimate the most compatible selected relationship and fitted coefficient term. The results showed that, the average of velocity of longshore current in Amirabad shore is 16cm/s and dominant direction of current is eastern.
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