NDLI: An expendable penetrometer for rapid assessment of seafloor parameters

Content Provider	IEEE Xplore Digital Library
Author	Akal, T. Stoll, R.D.
Copyright Year	1995
Description	Author affiliation: SACLANT Undersea Res. Centre, La Spezia, Italy (Akal, T.)
Abstract	Information on the geoacoustic and geotechnical parameters of the seafloor under changing environmental conditions is important in sonar performance evaluation as well as in many engineering applications. Presently this knowledge is being gained through rather elaborate direct and/or remote measurements of sediment parameters. However, recently there has been an increase in the need for a simple system that can remotely measure some of these parameters from a moving ship or aircraft. The authors' work to date suggests that a freefall penetrometer, based on existing XBT technology and able to sense deceleration upon impact with the seafloor, would be a valuable tool in assessing these seafloor properties. When such a probe first impacts the bottom there is rapid deceleration controlled by the shear strength of the sediment, followed by a period of damped oscillation with frequency dependent on the geoacoustic properties of the sediment. By a complete analysis of the impact signature, including both the initial plastic penetration and the subsequent damped oscillation, the authors are able to make a first order classification of the sediment type, shear strength and geoacoustic properties which will be useful in a variety of different applications including sonar performance predictions, evaluation of off-shore foundation sites for drilling towers and other structures, and the assessment of bottom conditions relevant to dredging operations. At present a series of laboratory tests and field tests in the Baltic Sea and the Mediterranean are being carried out. Results of a portion of this work are presented in this paper.
Starting Page	1822
Ending Page	1826
File Size	571660
Page Count	5
File Format	PDF
ISBN	0933957149
DOI	10.1109/OCEANS.1995.528858
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1995-10-09
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Sea floor Sediments Sonar applications Sea measurements Testing Sonar measurements Aerospace engineering Gain measurement Marine vehicles Aircraft
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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