Normal-Incidence, High-Frequency Bottom Penetration in the Soft Gassy Sediment of Eckernforde Bay, Germany

Normal incidence, high frequency acoustic bottom penetration measurements were made in the gassy sediment of Eckernfoerde Bay, Germany. Measurements were made of water sediment insertion loss and signal level as a function of frequency and hydrophone depth. Results showed that hydrophones located in...

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1. Verfasser:	Wilson, Marcia A
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Sprache:	eng
Schlagworte:	ACOUSTIC MEASUREMENT Acoustics HIGH FREQUENCY HYDROPHONES INSERTION LOSS OCEAN BOTTOM PE61153N RESONANT FREQUENCY REVERBERATION SEDIMENTS SIGNAL PROCESSING UNDERWATER ACOUSTICS UNDERWATER SOUND
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creator	Wilson, Marcia A
description	Normal incidence, high frequency acoustic bottom penetration measurements were made in the gassy sediment of Eckernfoerde Bay, Germany. Measurements were made of water sediment insertion loss and signal level as a function of frequency and hydrophone depth. Results showed that hydrophones located in a gassy sublayer had signal levels that were higher than the signal level at a hydrophone located just below the sediment water interface. This increase in amplitude is attributed to reverberation from free methane bubbles excited near and above their resonant frequency.
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Measurements were made of water sediment insertion loss and signal level as a function of frequency and hydrophone depth. Results showed that hydrophones located in a gassy sublayer had signal levels that were higher than the signal level at a hydrophone located just below the sediment water interface. This increase in amplitude is attributed to reverberation from free methane bubbles excited near and above their resonant frequency.</description><language>eng</language><subject>ACOUSTIC MEASUREMENT ; Acoustics ; HIGH FREQUENCY ; HYDROPHONES ; INSERTION LOSS ; OCEAN BOTTOM ; PE61153N ; RESONANT FREQUENCY ; REVERBERATION ; SEDIMENTS ; SIGNAL PROCESSING ; UNDERWATER ACOUSTICS ; UNDERWATER SOUND</subject><creationdate>1998</creationdate><rights>APPROVED FOR PUBLIC RELEASE</rights><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>230,780,885,27558,27559</link.rule.ids><linktorsrc>$$Uhttps://apps.dtic.mil/sti/citations/ADA343728$$EView_record_in_DTIC$$FView_record_in_$$GDTIC$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>Wilson, Marcia A</creatorcontrib><creatorcontrib>NAVAL RESEARCH LAB STENNIS SPACE CENTER MS HIGH FREQUENCY ACOUSTICS SECTION</creatorcontrib><title>Normal-Incidence, High-Frequency Bottom Penetration in the Soft Gassy Sediment of Eckernforde Bay, Germany</title><description>Normal incidence, high frequency acoustic bottom penetration measurements were made in the gassy sediment of Eckernfoerde Bay, Germany. Measurements were made of water sediment insertion loss and signal level as a function of frequency and hydrophone depth. Results showed that hydrophones located in a gassy sublayer had signal levels that were higher than the signal level at a hydrophone located just below the sediment water interface. This increase in amplitude is attributed to reverberation from free methane bubbles excited near and above their resonant frequency.</description><subject>ACOUSTIC MEASUREMENT</subject><subject>Acoustics</subject><subject>HIGH FREQUENCY</subject><subject>HYDROPHONES</subject><subject>INSERTION LOSS</subject><subject>OCEAN BOTTOM</subject><subject>PE61153N</subject><subject>RESONANT FREQUENCY</subject><subject>REVERBERATION</subject><subject>SEDIMENTS</subject><subject>SIGNAL PROCESSING</subject><subject>UNDERWATER ACOUSTICS</subject><subject>UNDERWATER SOUND</subject><fulltext>true</fulltext><rsrctype>report</rsrctype><creationdate>1998</creationdate><recordtype>report</recordtype><sourceid>1RU</sourceid><recordid>eNqFjbsOwjAMALswIOAPGPwB7UKRYG2hDxaEVPYqShxqaB2RmCF_Twd2ptPphlsmz6vzkxqzC2syyBpTaOkxZLXH92f2CKUTcRPckFG8EnIMxCADQuesQKNCiNChoQlZwFmo9As9W-cNQqliCg3OC47rZGHVGHDz4yrZ1tX91GZGSPdBaB70xbnI9_lhd8z_5C9ocDzw</recordid><startdate>19980423</startdate><enddate>19980423</enddate><creator>Wilson, Marcia A</creator><scope>1RU</scope><scope>BHM</scope></search><sort><creationdate>19980423</creationdate><title>Normal-Incidence, High-Frequency Bottom Penetration in the Soft Gassy Sediment of Eckernforde Bay, Germany</title><author>Wilson, Marcia A</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-dtic_stinet_ADA3437283</frbrgroupid><rsrctype>reports</rsrctype><prefilter>reports</prefilter><language>eng</language><creationdate>1998</creationdate><topic>ACOUSTIC MEASUREMENT</topic><topic>Acoustics</topic><topic>HIGH FREQUENCY</topic><topic>HYDROPHONES</topic><topic>INSERTION LOSS</topic><topic>OCEAN BOTTOM</topic><topic>PE61153N</topic><topic>RESONANT FREQUENCY</topic><topic>REVERBERATION</topic><topic>SEDIMENTS</topic><topic>SIGNAL PROCESSING</topic><topic>UNDERWATER ACOUSTICS</topic><topic>UNDERWATER SOUND</topic><toplevel>online_resources</toplevel><creatorcontrib>Wilson, Marcia A</creatorcontrib><creatorcontrib>NAVAL RESEARCH LAB STENNIS SPACE CENTER MS HIGH FREQUENCY ACOUSTICS SECTION</creatorcontrib><collection>DTIC Technical Reports</collection><collection>DTIC STINET</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Wilson, Marcia A</au><aucorp>NAVAL RESEARCH LAB STENNIS SPACE CENTER MS HIGH FREQUENCY ACOUSTICS SECTION</aucorp><format>book</format><genre>unknown</genre><ristype>RPRT</ristype><btitle>Normal-Incidence, High-Frequency Bottom Penetration in the Soft Gassy Sediment of Eckernforde Bay, Germany</btitle><date>1998-04-23</date><risdate>1998</risdate><abstract>Normal incidence, high frequency acoustic bottom penetration measurements were made in the gassy sediment of Eckernfoerde Bay, Germany. Measurements were made of water sediment insertion loss and signal level as a function of frequency and hydrophone depth. Results showed that hydrophones located in a gassy sublayer had signal levels that were higher than the signal level at a hydrophone located just below the sediment water interface. This increase in amplitude is attributed to reverberation from free methane bubbles excited near and above their resonant frequency.</abstract><oa>free_for_read</oa></addata></record>
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subjects	ACOUSTIC MEASUREMENT Acoustics HIGH FREQUENCY HYDROPHONES INSERTION LOSS OCEAN BOTTOM PE61153N RESONANT FREQUENCY REVERBERATION SEDIMENTS SIGNAL PROCESSING UNDERWATER ACOUSTICS UNDERWATER SOUND
title	Normal-Incidence, High-Frequency Bottom Penetration in the Soft Gassy Sediment of Eckernforde Bay, Germany
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