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.