Author： Khadge N. H.
Publisher： Taylor & Francis Ltd
ISSN： 1521-0618
Source： Marine Georesources and Geotechnology, Vol.23, Iss.4, 2005-10, pp. : 401-417
Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.
Abstract
During the Indian Deep-sea Environment Experiment (INDEX) conducted in the Central Indian Basin to simulate nodule mining activity, the sediments were physically disturbed, lifted from the seafloor, and then redeposited to study the effects of sediment redistribution on geological, chemical and biological characteristics of benthic environment. The first monitoring cruise, 44 months after the experiment, was part of long-term observations for restoration of conditions. This study describes the effects of the experiment on geotechnical properties of sediments measured in predisturbance, postdisturbance and monitoring phases. To compare the effects, sediment cores were collected from the same locations during the three phases. Siliceous, fine-grained sediments from the study area showed change in geotechnical properties induced due to the disturbance. Marginal increase in natural water content and significant reduction in undrained shear strength at the 0–5 cm sediment layer of cores from the tow zone during postdisturbance was observed. However, during the monitoring phase, an increase in shear strength and reduction in water content was noticed, which might indicate that the sediments are gradually acquiring predisturbance characteristics. The study also revealed that the meiofaunal density has a positive correlation with the water content, but a negative relationship with the shear strength of these siliceous sediments. Specific gravity of solids and porosity showed marginal change, whereas wet density remained unchanged.
Related content
Geotechnical Influence on the Acoustic Properties of Marine Sediments of the Santos Basin, Brazil
By Neto Arthur Ayres Teixeira Mendes Joana de Noronha de Souza Juliana Maria Gonçalves Redusino Miguel Leandro Bastos Pontes Rodrigo
Marine Georesources and Geotechnology, Vol. 31, Iss. 2, 2013-04 ,pp. :
Access to resources
Recommend
By Pattan J. N. Rao Ch. M. Migdisov A. A. Colley S. Higgs N. C. Demidenko L.
Marine Georesources and Geotechnology, Vol. 19, Iss. 3, 2001-07 ,pp. :