The impact of shrimp trawling and associated sediment resuspension in mud dominated, shallow estuaries

dc.acquisition-srcen_US
dc.call-noen_US
dc.contract-noen_US
dc.contributor.authorDellapenna, TMen_US
dc.contributor.authorAllison, MAen_US
dc.contributor.authorGill, GAen_US
dc.contributor.authorLehman, RDen_US
dc.contributor.authorWarnken, KWen_US
dc.contributor.otherEstuarine, Coastal and Shelf Scienceen_US
dc.date.accessioned2010-02-15T16:46:11Z
dc.date.available2010-02-15T16:46:11Z
dc.date.issuedSep. 2006en_US
dc.degreeen_US
dc.descriptionpgs. 519-530en_US
dc.description-otheren_US
dc.description.abstractTo address the relative importance of shrimp trawling on seabed resuspension and bottom characteristics in shallow estuaries, a series of disturbance and monitoring experiments were conducted at a bay bottom mud site (2.5m depth) in Galveston Bay, Texas in July 1998 and May 1999. Based on pre- and post-trawl sediment profiles of super(7)Be; pore water dissolved oxygen and sulfide concentration; and bulk sediment properties, it was estimated that the trawl rig, including the net, trawl doors, and ''tickler chain,'' excavate the seabed to a maximum depth of approximately 1.5cm, with most areas displaying considerably less disturbance. Water column profile data in the turbid plume left by the trawl in these underconsolidated muds (85-90% porosity; <0.25kPa undrained shear strength) demonstrate that suspended sediment inventories of up to 85-90mg -cm super(2) are produced immediately behind the trawl net; an order of magnitude higher than pre-trawl inventories and comparable to those observed during a 9-10m/s wind event at the study site. Plume settling and dispersion caused suspended sediment inventories to return to pre-trawl values about 14min after trawl passage in two separate experiments, indicating particles re-settle primarily as flocs before they can be widely dispersed by local currents. As a result of the passage of the trawl rig across the seabed, shear strength of the sediment surface showed no significant increase, suggesting that bed armoring is not taking place and the trawled areas will not show an increase in critical shear stress.en_US
dc.description.urihttp://gbic.tamug.edu/request.htmen_US
dc.geo-codeGalveston Bayen_US
dc.history1-15-09 kswen_US
dc.identifier.urihttp://hdl.handle.net/1969.3/18535
dc.latitudeen_US
dc.locationNot available in house - Please contact GBIC for assistanceen_US
dc.longitudeen_US
dc.notesen_US
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dc.relation.ispartofseries10058.00en_US
dc.relation.urien_US
dc.scaleen_US
dc.seriesen_US
dc.subjectecosystem disturbanceen_US
dc.subjectestauriesen_US
dc.subjectfishing gearen_US
dc.subjectmuden_US
dc.subjectocean flooren_US
dc.subjectplumesen_US
dc.subjectprofilesen_US
dc.subjectresuspended sedimentsen_US
dc.subjectshear strengthen_US
dc.subjectshrimpen_US
dc.subjectsurveysen_US
dc.subjectsuspended sedimenten_US
dc.subjecttrawlingen_US
dc.titleThe impact of shrimp trawling and associated sediment resuspension in mud dominated, shallow estuariesen_US
dc.typeArticleen_US
dc.universityen_US
dc.vol-issue69(3-4)en_US
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