SEVENTEEN YEARS OLD BERIS FISHERY PORT IS LOCATED IN SOUTHEASTERN OF IRAN, 85KM EAST OF CHABAHAR (FIGURE 1). THE MAIN BREAKWATER IS EXTENDED FROM SOUTH TO NORTH WHERE THE SECONDARY BREAKWATER IS IN EAST-WEST DIRECTION. THE PORT IS SUFFERING FROM TWO MECHANISMS OF SEDIMENTATION, I.E.SEDIMENTATION AT THE HEAD OF THE MAIN BREAKWATER AND REMARKABLE CHANGE OF SHORELINE POSITION AT THE BACK OF THE SECONDARY BREAKWATER WHICH MAY ENDANGER THE PORT ENTRANCE IN FUTURE.THE EQUILIBRIUM STATE OF BERIS BAY IS DEVELOPED FIRST. THE PARABOLIC SHAPE EQUATION IS USED AS THE BEST FITTING CURVE TO BE FITTED TO THE ACTUAL SHAPE OF THE BAY. MEPBAY SOFTWARE WAS EMPLOYED TO FIT THE PARABOLIC CURVE IN STATIC EQUILIBRIUM STATE. ON THE OTHER HAND, THE EXISTING AERIAL PHOTOGRAPHS WERE COMPARED TO UNDERSTAND THE LONG-TERM EVOLUTION OF THE BAY.PMS MODULE OF MIKE21 WAS USED FOR THE NUMERICAL MODELING OF WAVE TRANSFORMATION FROM DEEP WATER TO SHALLOW AREAS. NEARSHORE WAVE CHARACTERISTICS AND THE WAVE DIRECTION AT THE TIP OF THE MAIN BREAKWATER WERE OBTAINED FROM WAVE TRANSFORMATION MODEL. THE OUTPUTS REVEALED THAT THE NEARSHORE DIRECTIONS OF WAVE COMPONENTS ARE NOT PERPENDICULAR TO THE COAST RESULTING TO A LONGSHORE SEDIMENT TRANSPORT ALONG THE COASTLINE. HYDROSED SOFTWARE WAS EMPLOYED FOR THE MODELING OF CURRENTS AND SEDIMENT TRANSPORT. THE POTENTIAL LONGSHORE SEDIMENT TRANSPORT (LST) WAS OBTAINED BY HYDROSED AND IT WAS COMPARED WITH THE ACTUAL LST RATE FOUND FROM THE COMPARISON OF HYDROGRAPHIC SURVEYS.SPECIFYING THE LST RATE AS AN INPUT VALUE, GENESIS SOFTWARE WAS FINALLY EMPLOYED FOR THE PREDICTION OF BERIS SHORELINE POSITION IN DIFFERENT YEARS. THE COMPUTATION WAS CONTINUED UNTIL THE SHORELINE COMES TO A DYNAMIC EQUILIBRIUM STATE. THE FINAL SHAPE OF THE BAY WAS IN GOOD AGREEMENT WITH THE ACTUAL SHAPE OF THE BAY.

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PREDICTION OF THE SEDIMENT TRANSPORT RATE IS A MAIN REQUIREMENT IN COASTAL ENGINEERING. ALTHOUGH IN MOST CASES SEDIMENT TRANSPORT TAKES PLACE MAINLY BY WAVES AND CURRENTS, THERE ARE ALSO CASES WHERE SEDIMENTS ARE TRANSPORTED BY WIND. IN SUCH CIRCUMSTANCES, REFRAINING FROM SEDIMENT TRANSPORT IN SEDIMENTARY BUDGET LEADS TO LARGE ERRORS IN THE DETERMINATION OF SEDIMENTARY COMPONENT. DESPITE OTHER MECHANISMS OF SEDIMENT TRANSPORTATION, THERE ARE A FEW RESEARCHES ON THE WIND SEDIMENTS TRANSPORTS. IN THIS PAPER, WIND SEDIMENT TRANSPORT IN THE CHABAHAR BAY DESALINATION PLANT IS STUDIED.

THE INTERACTIONS BETWEEN WAVES AND CURRENTS WERE EVALUATED AND THEIR POTENTIAL INFLUENCE ON SEDIMENT TRANSPORT ASSESSED. TO CONSIDER WAVE-CURRENT INTERACTIONS, WAVE AND CURRENT FIELDS WERE INDIVIDUALLY EXAMINE AND THEN COMBINED. FLOW FIELDS WERE EXPLORED USING AN AVAILABLE HYDRODYNAMIC MODEL, THE ENVIRONMENTAL FLUID DYNAMICS CODE (HAMRICK, 1996; JIN ET AL. 2000). THREE FLOW FIELDS WERE CONSIDERED: A STRONG CURRENT (A RIVER), A MODERATE CURRENT (A BAY OR HARBOR), AND A WEAK CURRENT (SMALL LAKE WITH WIND-DRIVEN CIRCULATION). WAVE FIELDS WERE EXPLORED USING SMALL AMPLITUDE (LINEAR) WAVE THEORY. THE COMBINED EFFECT OF WAVE-CURRENT INTERACTIONS WAS EXPLORED USING THE APPROACH OF GRANT AND MADSEN (1979). THESE ANALYSES INDICATE THAT, IN THE PRESENCE OF CURRENTS, WAVES DRAMATICALLY ENHANCE SEDIMENT TRANSPORT. EVEN WHEN A CURRENT IS WEAK, THE COMBINED EFFECT OF WAVES AND CURRENTS CAN RESUSPEND AND TRANSPORT SEDIMENTS. FOR THE CONDITIONS EXPLORED, BOTTOM SHEAR STRESSES FROM WAVE-CURRENT INTERACTION WERE GREATER THAN THE SHEAR STRESSES FROM CURRENTS ALONE BY AN ORDER OF MAGNITUDE OR MORE.

1. INTRODUCTION: A TIDAL RIVER IS A RIVER THAT CONNECTED TO SEA OR OCEAN AND WHOSE FLOW AND LEVEL ARE INFLUENCED BY TIDES. SUSPENDED SEDIMENT MOVING ALONG WITH THE RIVERS HAS COMPLEX BEHAVIORS. IN HERE, THE TWO-DIMENSIONAL NUMERICAL SIMULATION OF SEDIMENT BEHAVIOR WAS PERFORMED USING SPH1 METHOD.....

IMAM PORT COMPLEX IS LOCATED IN THE KHOUR MUSA ESTUARY, NORTHWEST OF THE PERSIAN GULF. THIS PORT COMPLEX ACCEPTS VERY LARGE SHIPS, UP TO 120’000 DWT, AT ITS VARIOUS TYPES OF BERTHS AND THEREFORE PLAYS A CRUCIAL ROLE IN EXPORT/IMPORT OF MILLION TONS OF GOODS EACH YEAR. LOCATION OF THE PORT WHICH IS NEARLY AT THE END OF 90KM LONG KHOUR MUSA ESTUARY, IS VERY WELL PROTECTED AGAINST SEA WAVES, WHILE A STRONG TIDE (UP TO 5M) PRODUCES STRONG CURRENTS.IMAM PORT AUTHORITY INTENDS TO INCREASE BERTHING CAPACITY OF EAST-WEST JETTIES (HEREINAFTER EWJ) BY CHANGING THE TYPE OF THE BERTH, FROM AN OPEN TYPE TO A SOLID FACE QUAY WALL AND FILL THE OPENINGS BETWEEN ITS ACCESS BRIDGES. THIS CHANGE IS LIKELY TO INFLUENCE THE PRESENT FLOW REGIME AND CONSEQUENTLY RESULT IN SEDIMENTATION IN THE NEIGHBOURING AREAS. THIS PAPER PRESENTS THE FIELD MEASUREMENTS AND NUMERICAL MODELING RESULTS IN SOME STEPS WHICH INCLUDE DESCRIPTION OF THE METHODS AND RESULTS OF RECENT FIELD MEASUREMENTS, RECOGNITION OF THE EFFECTIVE PHENOMENA IN SEDIMENT REGIME IN THE STUDY AREA, SET UP AND CALIBRATION OF A THREE DIMENSIONAL NUMERICAL MODEL USING EXTENSIVE FIELD OBSERVATIONS CARRIED OUT IN THE AREA AND AT THE END, INVESTIGATION ON THE LIKELY EFFECTS OF THE ABOVE MENTIONED CHANGES IN THE EWJ.