http://nopr.niscpr.res.in/handle/123456789/38393 Thu, 08 Oct 2026 09:14:30 GMT 2026-10-08T09:14:30Z http://nopr.niscpr.res.in/handle/123456789/38828 Title: Study of Horizontal Bottom Velocities and Prediction of Sediment Transport behind a Submerged Breakwater Authors: Baba, M Abstract: Bottom horizontal velocity asymmetry and the resultant bottom sediment motion on the leeside of a submerged break water are examined. The laboratory tests are conducted with regular waves. In general the net bottom transport for the tested conditions is directed towards the shore behind the submerged breakwater. The sediment transport here is found to depend on the types of waves, whether they are regular or irregular, their height and the water level variation over the submerged breakwater. The use of irregular waves, which are closer to the real sea conditions, is recommended in similar investigations, as the information obtained from irregular and regular waves are different. The conditional total impulses method suggested by Longinov is found to be an effective tool in assessing the direction and intensity of net bottom water particle motion and the sediment transport. Page(s): 117-122 Sun, 01 Sep 1985 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/38828 1985-09-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/38827 Title: Ooids in Deep Sea Core from the Western Continental Margin of India Authors: Hussain, N; Guptha, M V S Abstract: Ooids occur at 520 and 640 cm sediment depths in a deep sea core taken from a water depth of 3085 m from Arabian Sea. CaCO3 content of the bulk sediments in these oolitic sections at c. 520 and 640 cm is 58 and 72U+0025 respectively. Ooids show an excess of 50U+0025 Sr compared to marine aragonitic deposits. U-Th series radionuclide data on the separated ooids from 63 mu m fraction appear to suggest that they are younger than 25,000 y. They also show 1.2 plus or minus 0.2 dpm g-1 excess of 236Ra over that of 230Th. Transportation of these ooids from relatively shallower depths to the present location due to slumping of the sediments is envisaged. Page(s): 123-126 Sun, 01 Sep 1985 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/38827 1985-09-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/38826 Title: Morphology and Grain-Size Characteristics of a Log-Spiral Beach at Nagwa (Diu), West Coast of India Authors: Veerayya, M; Shenoi, S S C; Murty, C S Abstract: Sediment samples collected along 6 beach profiles of a log-spiral shaped beach and nearby dunes have been studied for particle size distribution in relation to wave refraction patterns. The results reveal that the foreshore sediments are in the coarse to fine sand grade (M Gamma 0.84 to 2.96 phi), well to poorly sorted 0.45 to 1.73 phi) and positive to negatively skewed (0.25 to -0.54 ski) classes. Sediments at profile st 1 in E are coarser and poorly sorted while they are fine-grained and better sorted in W as well as along the curved section of the beach. Alongshore variations in grain-size characteristics of beach sediments which have been discussed in relation to beach topography, wave induced littoral flows and prevaling meteorological and oceanographic conditions indicate clearly the suitability of the area close to st 6 in the curved part of the bay for developmental activities related to coastal zone. Page(s): 127-132 Sun, 01 Sep 1985 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/38826 1985-09-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/38825 Title: Sedimentological Aspects of Alleppey Mud Bank, West Coast of India Authors: Ramachandran, K K; Mallik, T K Abstract: Bathymetry, distribution of suspended matter and textural variations of the sediments are discussed in the light of mud bank formation. Soupy form of nearshore sediment build up contains abundant clay fraction (up to 66.14U+0025). High suspended matter concentration is observed in seawater at surface as well as at 1 m above the bottom (439.3 mg.l-1). Local sediment dispersal system is characterised by transport from all directions towards the central portion. This is indicated by silt/clay ratio, suggesting transportation of mud from offshore which might have been caused by converging currents. Page(s): 133-135 Sun, 01 Sep 1985 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/38825 1985-09-01T00:00:00Z