Wave refraction in relation to beach stability along the coast from Cape Ramas to Karwar

A.D. Gouveia, P.S. Joseph, P.G. Kurup

Abstract



Results of wave refraction and beach profile studies are presented for a stretch of 35 km shore line comprising of Loliem Beach, Karwar, Karnataka, India which is separated by rock promontories from comparatively stable beaches on either side of it. The study reveals three distinct phases in the annual cycle of the Loliem Beach: (1) erosion from mid-May to August, (2) deposition from September to November, and (3) a comparatively stable period from December to May. There is a maximum sand cover during the month of April about 2 m thick. By the end of June most of the sand cover is removed, exposing the rock substratum. For waves approaching from 240 degrees, Loliem forms a region of diverging littoral currents for all periods, whereas those approaching from 270 degrees with 5 and 8 sec periods cause southerly transport. Higher period waves, however, for the same direction produce divergence. When the wave direction is 300 degrees, only 5 sec waves are found to cause uniform southerly transport while all the other periods give rise to diverging littoral currents. No waves are seen to produce converging littoral currents at Loliem

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