Hydrography and Circulation Processes of Gulf Estuaries

Ward, George H.

doi:10.1007/978-1-4757-5177-2_7

Cited by 27 publications

(16 citation statements)

References 1 publication

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“…This trend would be consistent with material moving upland in the channel and it is known that the channel's net drift is upland. This has been noted in Bobb et al (1973);Ward (1980);and Berger et al (1995a). These references confirmed that over most of the lower bay channel, the drift is in the flood direction (upland) over the water column.…”

Section: Field Data Collection and Analysissupporting

confidence: 52%

Houston-Galveston Navigation Channels, Texas Project. Navigation Channel Sedimentation Study, Phase 2

Tate¹,

Berger²,

Ross³

2008

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The U.S. Army Engineer District, Galveston, has recently enlarged the Houston Ship Channel from a 40-ft (12.2-m) depth by 400-ft (122-m) width to a 45-ft (13.7-m) depth by 530-ft (162-m) width. Previously, a three-dimensional (3-D) numerical model study was implemented at the U.S. Army Engineer Research and Development Center's Coastal and Hydraulics Laboratory to evaluate the salinity and circulation impact of this enlargement. The enlarged channel is nearly complete. Preliminary evaluations indicate a higher than anticipated rate of deposition in the channel reach near Atkinson Island. The purpose of this investigation was to determine if this new shoaling rate was a permanent feature of this new channel or a single anomalous event. If this considerably larger deposition is a permanent condition then the planned disposal locations must be expanded. The project will determine the possible effects on sedimentation in the channel based on dredging records, field data, vessel effects, and hydrodynamic changes due to the channel's enlargement.

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Section: Field Data Collection and Analysissupporting

confidence: 52%

Houston-Galveston Navigation Channels, Texas Project. Navigation Channel Sedimentation Study, Phase 2

Tate¹,

Berger²,

Ross³

2008

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“…Winds have a particularly strong influence on water exchange between the Gulf of Mexico and estuaries where tidal amplitudes are low (Smith 1977, Swenson & Chuang 1983 Wiseman 1986, Stumpf et al 1993). In 1991, peak settlement was correlated with onshore winds, which prevail during summer and early autumn (Ward 1980, Schroeder & Wiseman 1986. These winds may transport rnegalopae shoreward in the neuston until they reach the front of the plume flowing from Mobile Bay.…”

Section: Settlement In Mobile Bay Versus Atlantic Estuariesmentioning

confidence: 99%

Population regulation of blue crabs Callinectes sapidus in the northern Gulf of Mexico:postlarval supply

Morgan¹,

Rk²,

Kl³

et al. 1996

Mar. Ecol. Prog. Ser.

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Larval supply and early postsettlement mortality are crucial to the maintenance of most manne populat~ons Larval supply may be espec~ally important in regulating populat~ons of blue crabs Callinectes sapidus because many larvae could be lost during long migrations between estuanes and offshore waters We examined the relative contnbutions of different~al transport and habltat preferences of megalopae (postlarvae) to 5 potential nursery habitats In Mobile Bay and M~ssissippl Sound Alabama USA Settlement In each habitat was determined dally during summer and fall for 2 yr and was related to sea surface temperature wind stress, tides, current velocity and the lunar and tidal amplitude cycles In 1990, most megalopae settled when winds blew megalopae onshore and tidal amplitudes were m~n i m a l In 1991, onshore winds were light and Infrequent, and megalopae settled even more densely d u n n g minlmum amplitude tides Sem~dally collect~ons of megalopae at dusk and dawn revealed that most megalopae recruit to estuanes during nocturnal flood tldes, which only occur dunng summer and fall in this diurnal tidal regime Thus, onshore winds facilitated transport of megalopae into estuanes ep~sodically, but megalopae recruited regularly and abundantly d u n n g nocturnal mlnilnum a m p l~t u d e flood t~d e s even when onshore w~n d s were light or absent most megalopae were collected in the lower bay although some megalopae settled at the head of the estuary 50 km away from the baymouth Megalopae required about 2 d to travel this distance as they became increasingly conlpetent to settle from the plankton Physiological tolerances may e x p l a~n why most larvae settled in high salinity waters, but differences in current regunes may best explain differences in settlement among sites In the lower bay Several types of substrate were transplanted from nursery habitats to a sandy area at the baymouth to d e t e r m~n e whether megdlopae prefer to settle in seagrass beds, marshes or unvegetated substrate once they arnve at a site Megalopae strongly preferred to settle on vegetation, but ~t remains unclear whether or not they discriminate among plant types Thus, passlve dehvery and habitat preferences of megalopae both may d e t e r m~n e the initial distnbutions of l u v e n~l e blue crabs

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“…Most canals were constructed for navigation to oil and gas drilling sites or as corridors for laying pipelines (Davis 1973). Although the impact of deep navigation channels on estuaries and coastal wetlands can be significant (Ward 1980), canals constructed for developing petroleum resources (access and pipeline canals) have had a greater direct impact on coastal wetlands in Louisiana because they are much more numerous (Turner and Cahoon 1987).…”

Section: Introductionmentioning

confidence: 99%

Comparison of nekton habitats associated with pipeline canals and natural channels in Louisiana salt marshes

Rozas

1992

Wetlands

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Nekton of Louisiana coastal marshes was sampled approximately twice monthly between June 1990 and May 1991 (1) on marshes adjacent to canals and on natural marshes with flumes and (2} within canals and natural channels using a small trawl. Canals constructed using two different methods (flotation and push) were studied. Dagger-blade grass shrimp Palaemonetes pugio, blue crabs Caltinectes sapidus, Gulf killifish Fundulus grandis, diamond killifish Adinia xenica, brown shrimp Penaeus aztecus, and sheepshead minnows Cyprinodon variegatus dominated catches in terms of numbers and biomass on marshes as well as in canals and natural channels. Although densities of some species differed among the various sites that were sampled (e.g., dominant cyprinodonts were most abundant in creek tributaries), densities in canal and natural channel habitats were not significantly different. Predator encounter rates in canals and natural channels were similar, suggesting that the value of habitat in canals may increase over time as slumping decreases depth and steepness of bottom profiles and creates shallow subtidal refugia along the canal-marsh interface. The nurse~ function of canals open to tidal flushing is probably enhanced by the presence of fringing marshes, which provide habitat for nekton at high tide.

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Hydrography and Circulation Processes of Gulf Estuaries

Cited by 27 publications

References 1 publication

Houston-Galveston Navigation Channels, Texas Project. Navigation Channel Sedimentation Study, Phase 2

Houston-Galveston Navigation Channels, Texas Project. Navigation Channel Sedimentation Study, Phase 2

Population regulation of blue crabs Callinectes sapidus in the northern Gulf of Mexico:postlarval supply

Comparison of nekton habitats associated with pipeline canals and natural channels in Louisiana salt marshes

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