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Changes in nutrient, dissolved oxygen and total suspended matter during simulated placer mining

DRS at CSIR-National Institute of Oceanography

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Title Changes in nutrient, dissolved oxygen and total suspended matter during simulated placer mining
 
Creator Sijinkumar, A.V.
Naik, T.
Nath, B.N.
Sharma, R.
 
Subject Nutrients (mineral); Dissolved oxygen; Suspended particulate matter; Placer mining; Simulation; Water column
 
Description In order to study the impact of placer mining on shallow coastal waters, a simulated sand mining experiment was carried out in Kalbadevi, Ratnagiri, west coast of India, which is recognized as one of the future sand mining sites. Water column characteristics such as Total Suspended Matter (TSM), Dissolved Oxygen (DO) and nutrients (phosphate, nitrite, nitrate and silicate) were studied in different stages of the experiment (pre mining, during mining, post mining) in view of their essential nature in regulating the coastal ecosystem. Tire test mining experiment was conducted on a stable platform, anchored from three sides at a water depth of 8 meter. The water samples were collected from three locations viz., the Suction point (S), the Discharge point (D) and the Reference Point (R) at two depths of 1 m and 3 m at different time intervals for a period of 5 hours. At the discharge point, DO concentration attained the baseline condition shortly after the experiment that is similar to the values, observed at the reference point. During the early stages of experiment, phosphate concentration increased but attained baseline condition after the experiment probably related to the upward movement of bottom nutrient rich sediments due to suction. Nitrite and nitrate concentration decreased in the early stage of disturbance but increased with the progress of time. Initial decrease could be attributed to the denitrification brought about by the disturbance and the later increase could be probably due to new production. In the early st age of the experiment, silicate shows decrease in concentration than the reference point but attains baseline condition in the later stages of the experiment. TSM increased drastically (from 21 mg/l to 40 mg/l) at the discharge point during test mining, may due to the coarse nature of sediment where as the TSM values at Suction and Reference points remained below 20 mg/l throughout-the experiment. All the parameters showed sudden response to the disturbance but attained base level condition soon after the experiment.
 
Date 2008-01-31T07:25:54Z
2008-01-31T07:25:54Z
2007
 
Type Conference Article
 
Identifier National Seminar on Exploration, Exploitation, Enrichment and Environment of Coastal Placer Minerals (PLACER - 2007), eds. Loveson, V.J.; Sen, P.K.; Sinha, A. 260-269p.
http://drs.nio.org/drs/handle/2264/747
 
Language en
 
Publisher Macmillan, India