Wednesday Jun 20, 2018

Kangan-Dayyer

Kangan-Dayyer area is one of special study sites for Phase II of Monitor SB&B Project. This is an important area because of the two important ports and also because of the DayyerRiver located east of DayyerPort in between the two ports.
The shoreline between Kangan and Dayyer Ports is located in a valley (syncline) between Darang and Kangan anticlines.  Dayyer River flows through this valley and discharges its sediment load in this area.  As a result, the beach between Kangan and DayyerPortshas a relatively mild slope and is mostly sandy.  Analysis of DayyerRiver watershed indicated that every year the river discharges approximately 30,000 m3 of sand into the Persian Gulf.

عکس ماهواره ای Google از ناحیه کنگان – دیر 

Google satellite image of the Kangan-Dayyerarea

The reach between Kangan and Dayyer ports is located in a gap between Darang and Kangan anticlines. Dayyer River mouth is located between the two ports and the beach in this area is sandy. The coastlines around KanganPort are formed of rocky mountains/cliffs fronted by narrow beaches. Beaches in this area are mostly made of cobbles, pebbles and coarse sand on the bedrock.

Dayyer Port was constructed before 1980 for commercial purposes and was expanded by Iranian Fisheries Organization between 1994 and 1998. It is the largest fishery port of Iran and accommodates about 750 boats of different kinds. The current port has an east (fishery) basin and a west (commercial) basin with a common port entrance towards the west.

Our methodology in the present study is to employ numerical modeling together with GIS analysis of historic shoreline changes and engineering judgment and experience to define sand supply and/or transport rates.  Hydrodynamic and sediment transport analysis was conducted based on calculated wave field and depth averaged flows in two horizontal dimensions. The driving forces considered behind the movement of sediments in the nearshore are the
wave-induced orbital motion and the nearshore current system including longshorecurrents.  Tidal and wind-driven currents are not considered because their contribution to the transport of sand in coastal areas is usually insignificant.  The Danish Hydraulic Institute’s (DHI) MIKE21 modeling package was applied to the analysis of the conditions of waves, nearshore currents and sediment transport at the selected sites.  This advanced software employs state-of-the-art computer simulation techniques to model waves, hydrodynamic processes and sediment transport processes.

جریانات نزدیک ساحل برای موج 2 متر، 8 ثانیه و از جهت غرب در اطراف بندر کنگان 
Nearshore currents for 2 m, 8 s, W waves around Kangan Port.