Please use this identifier to cite or link to this item: https://hdl.handle.net/11681/20464
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dc.contributor.authorShafer, Deborah J.en_US
dc.contributor.authorNelson, David A. (David Arthur), 1955-en_US
dc.creatorDredging Operations Technical Support Program (U.S.)en_US
dc.creatorU.S. Army Engineer Waterways Experiment Stationen_US
dc.date.accessioned2016-12-30T19:54:15Zen_US
dc.date.available2016-12-30T19:54:15Zen_US
dc.date.issued1996-08en_US
dc.identifier.govdocMiscellaneous Paper D-96-3en_US
dc.identifier.urihttp://hdl.handle.net/11681/20464en_US
dc.descriptionMiscellaneous Paperen_US
dc.description.abstractThe rigid deflector draghead was tested on a hopper dredge in Port Canaveral Harbor entrance channel from 16-30 September 1994. The effectiveness of the draghead was assessed by determining if turtles were: (a.) present in the channel in sufficient numbers to encounter the draghead, (b.) on the channel bottom where they were most susceptible to entrainment by the draghead, and (c.) entrained by the rigid deflector draghead at a lower rate than by the California draghead. A total of 13 turtles (0.47 turtle/hour) were captured during three standardized sea turtle trawl surveys. The activities of 12 loggerhead turtles (Caretta caretta) were monitored intermittently from 5-30 September 1994 using radio tags and depth-sensitive sonic tags. These behavioral studies showed that loggerhead turtles spent most of their time (83.2 percent) on the seafloor. No loggerhead turtles were entrained during the dredging operations; however, one small green turtle (Chelonia mydas) was entrained during the dredging (0.09 turtle/day). Based on the observed levels of sea turtle abundance, a preponderance of bottom time for loggerhead sea turtles, and a low rate of sea turtle entrainment, the rigid deflector draghead may be effective in reducing sea turtle entrainment by hopper dredge in Port Canaveral Harbor entrance channel.en_US
dc.description.sponsorshipDredging Operations Technical Support Program (U.S.)en_US
dc.description.sponsorshipUnited States. Army. Corps of Engineers. Jacksonville Districten_US
dc.description.tableofcontentsPreface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . viii Conversion Factors, Non-SI to SI Units of Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . x 1-Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Problem . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Purpose and Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2-Background . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Previous Achievements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Approach . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3-Materials and Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Study Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Dredge Operation and Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . 5 Permits . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Trawling Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Turtle Tagging, Handling, and Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 General Telemetry Specifications . . . . . . . . . . . . . . . . . . . . . . . . . 7 Physical Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Data Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 4-Results and Discussion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Sea Turtle Abundance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Rate of Sea Turtle Entrainment . . . . . . . . . . . . . . . . . . . . . . . . . 12 Sea Turtle Size Distribution . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Environmental Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Diving and Submergence Behavior . . . . . . . . . . . . . . . . . . . . . . . 17 Turtle Locations and Movements . . . . . . . . . . . . . . . . . . . . . . . . 23 5-Summary and Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 6-References . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Appendix A: Data Sheets . . . . . . . . . . . . . . . . . . . . . . . . . . . . Al Appendix B: Turtle Trawl Net Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bl SF 298en_US
dc.format.extent45 pages/18.09 MBen_US
dc.format.mediumPDFen_US
dc.language.isoen_USen_US
dc.publisherU.S. Army Engineer Waterways Experiment Stationen_US
dc.relationhttp://acwc.sdp.sirsi.net/client/search/asset/1054406en_US
dc.relation.ispartofseriesMiscellaneous Paper (Dredging Operations Technical Support Program (U.S.)) ; no.Miscellaneous Paper D-96-3en_US
dc.rightsApproved for public release; distribution is unlimiteden_US
dc.sourceThe ERDC Library created this digital resource using one or more of the following: Zeta TS-0995, Zeutcehl OS 12000, HP HD Pro 42-in. map scanner, Epson flatbeden_US
dc.subjectLoggerhead turtlesen_US
dc.subjectCaretta carettaen_US
dc.subjectSea turtlesen_US
dc.subjectRigid deflector dragheaden_US
dc.subjectDredgingen_US
dc.subjectEnvironmental effectsen_US
dc.subjectDredging Operations Technical Support Program (U.S.)en_US
dc.titleEffectiveness of a sea turtle-deflecting hopper dredge draghead in Port Canaveral Entrance Channel, Floridaen_US
dc.typeReporten_US
Appears in Collections:Miscellaneous Paper

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