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Venkatesh, K. V.
- An Account of the Bottom Sediments off Andaman Islands, India
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Authors
Affiliations
1 Offshore Mineral Exploration and Marine Geology Division, Geological Survey of India, Calcutta, IN
1 Offshore Mineral Exploration and Marine Geology Division, Geological Survey of India, Calcutta, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 19, No 11 (1978), Pagination: 483-494Abstract
The sediments comprise sand, sandy silt, silty sand and clayey silt. Variation in their distribution with depth is discernible. Studies on the grain size parameters of the sediments reveal that the inclusive graphic mean vary from 2.3 to 7.0, inclusive graphic standard deviation 1.2 to 2.9 phi, inclusive graphic skewness -.07 to +.71 and kurtosis 0.6 to 5.4. Generally sand is extremely leptokurtic, positively skewed and better sorted than the rest of the sediments. Presence of two energy environments has been noticed.</P><P>The phosphate content in the sediments varies from 0.12 to 0.47% and calcium oxide from 3.0 to 27.15%. It is observed that, unlike CaO, a higher percentage of P2O5 is prevalent in the near shore sediments than those of the deep offshore.- Grain Size Variation in the Sediments off Tuticorin Harbour, Tamil Nadu
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Authors
K. V. Venkatesh
1,
I. Ray
2
Affiliations
1 Punja Building, Lalbagh, Mangalore 575003, IN
2 Geological Survey of India, A/3 Sawai Jai Singh Marg, Jaipur 302 006, IN
1 Punja Building, Lalbagh, Mangalore 575003, IN
2 Geological Survey of India, A/3 Sawai Jai Singh Marg, Jaipur 302 006, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 22, No 4 (1981), Pagination: 181-189Abstract
The size parameters of the near shore sediments off Tuticorin vary as follows: inclusive graphic mean from 1.41 to 2.22 phi; standard deviation 0.58 to 0.91 phi; skewness - .07 to - .37 and kurtosis 0.91 to 1.15. Decrease in the values of mean size towards southwest indicates the movement of sand in that direction which is largely aided by the wind induced currents. A close correlation between mean grain size and sorting is mferred. Sporadic occurrences of coarser sand nestled by finer ones noticed closer to the site of break-waters speaks of the low transporting ability of the back wash. The important mode of transport is through saltation and traction.- Study of Beach Sand Movement by Fluorescent Tracer at Coondapur, S. Kanara District, Karnataka
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Authors
Affiliations
1 Geological Survey of India, Punja buildings, Lalbaugh, Mangalore 575003, IN
1 Geological Survey of India, Punja buildings, Lalbaugh, Mangalore 575003, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 23, No 9 (1982), Pagination: 444-449Abstract
Three fluorescent tracer tests were carried out in the swash zone on a strip of the beach, south of Ganguli light house. An analysis of the tracer dispersion pattern reveals that generally the predominant vector of sand movement is along shore in a southerly direction. The grain velocity varies from 0.7 to 1.23m/min. It is observed to be higher in the finer sized grains than in the coarse grains. The computed rate of sand depletion for the first ten minutes is 1.99 kg/min. The result of the size analysis data shows that the sand grains tend to undergo differential motion with the coarser sized ones moving towards the shore and the finer ones seawards.- A Note on the Study of Sediment Movement at Karwar, Karnataka
Abstract Views :254 |
PDF Views:94
Authors
K. V. Venkatesh
1,
I. Ray
1
Affiliations
1 Geological Survey of India, Calcutta, IN
1 Geological Survey of India, Calcutta, IN