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Benthic Disturbance and Impact Experiments in the Central Indian Ocean Basin
As a part of the Environmental Impact Assessment studies for nodule mining, a long-term program has been initiated in the Central Indian Basin. Multidisciplinary studies on geological, biological, physical, and chemical parameters were carried out in an area selected on the basis of baseline data collected in the first phase of the program. A benthic disturbance was simulated with a hydraulic device also used in the previous experiments in the Pacific Ocean. A site of 3,000 × 200 m was repeatedly disturbed by a combination of fluidizing pump and suction pump to dislodge and discharge sediment from the seafloor into the water column 5 m above the seafloor. During 9 days of operation, 26 tows were carried out for 47 h of disturbance, resuspending about 6,000 m3 of sediment along an 88-km line. Data for postdisturbance impact assessment were collected with sediment traps, deep-towed cameras, seafloor samples, and conductivity-temperature depth sensor (CTD)-rosette observations. Seafloor data, sediment samples, and water column studies were aimed at evaluating the impact of benthic disturbance, on the basis of pre- and post-disturbance data collected during the experiment. Observations show that vertical mixing of sediment as well as its lateral movement and resedimentation because of plume migration alters various parameters and leads to changes in the environment around the area.
Benthic Disturbance and Impact Experiments in the Central Indian Ocean Basin
As a part of the Environmental Impact Assessment studies for nodule mining, a long-term program has been initiated in the Central Indian Basin. Multidisciplinary studies on geological, biological, physical, and chemical parameters were carried out in an area selected on the basis of baseline data collected in the first phase of the program. A benthic disturbance was simulated with a hydraulic device also used in the previous experiments in the Pacific Ocean. A site of 3,000 × 200 m was repeatedly disturbed by a combination of fluidizing pump and suction pump to dislodge and discharge sediment from the seafloor into the water column 5 m above the seafloor. During 9 days of operation, 26 tows were carried out for 47 h of disturbance, resuspending about 6,000 m3 of sediment along an 88-km line. Data for postdisturbance impact assessment were collected with sediment traps, deep-towed cameras, seafloor samples, and conductivity-temperature depth sensor (CTD)-rosette observations. Seafloor data, sediment samples, and water column studies were aimed at evaluating the impact of benthic disturbance, on the basis of pre- and post-disturbance data collected during the experiment. Observations show that vertical mixing of sediment as well as its lateral movement and resedimentation because of plume migration alters various parameters and leads to changes in the environment around the area.
Benthic Disturbance and Impact Experiments in the Central Indian Ocean Basin
Sharma, Rahul (Autor:in) / Nagendernath, B. (Autor:in) / Valsangkar, A. B. (Autor:in) / Parthiban, G. (Autor:in) / Sivakolundu, K. M. (Autor:in) / Walker, Gavin (Autor:in)
Marine Georesources & Geotechnology ; 18 ; 209-221
01.07.2000
13 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Unbekannt
Benthic Disturbance and Impact Experiments in the Central Indian Ocean Basin
| Online Contents | 2000
Response of Meiofauna to Immediate Benthic Disturbance in the Central Indian Ocean Basin
| Taylor & Francis Verlag | 2000
Response of Meiofauna to Immediate Benthic Disturbance in the Central Indian Ocean Basin
| Online Contents | 2000
Microscale Response of Sediment Variables to Benthic Disturbance in the Central Indian Ocean Basin
| Taylor & Francis Verlag | 2000
Microscale Response of Sediment Variables to Benthic Disturbance in the Central Indian Ocean Basin
| Online Contents | 2000