Coastal circulation off Bombay in relation to waste water disposal

V. Josanto, R.V. Sarma


Flow patterns in the coastal waters of Bombay were studied using recording current meters, direct reading current meters, floats and dye in relation to the proposed waste water disposal project of the Municipal Corporation of Greater Bombay from 1976 to 78. The water movements were mainly tide-induced and elliptical in nature, with the major axis more or less parallel to the coast. The currents were mainly towards the northeast at a bearing of approximately at 30 degrees during flood and towards the southwest approximately at 210 degrees during ebbs, with a counterclockwise during spring ebbs occasionally reached 3 km/hour. A strong onshore shift of current vectors during the slack periods. The peak velocities during spring ebbs occasionally reached 3 km/hr. A strong onshore component was noticed in the nearshore waters mainly due to the wind drift and is quite likely that a portion of the effluent material released 3 kms off shore, could, under extreme wind-induced drift, reach the shore in about 6 to 10 hrs


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