Deposition and long-shore transport of dredge spoils to nourish beaches: Impacts on benthic infauna of an ebb-tidal delta

Melanie J. Bishop, Charles H. Peterson, Henry C. Summerson, Hunter S. Lenihan, Jonathan H. Grabowski

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Dredged materials from maintenance and deepening of inlets on coastal barriers are typically transported for disposal in deep water or on land. An alternative is to treat dredged materials as a resource, placing them on the ebb-tidal delta or subtidal shoals at depths where they are retained within the long-shore transport system and can nourish eroding down-drift beaches. Deposition of sediments onto subtidal shoals may, however, bury and selectively kill populations of benthic invertebrates, or indirectly alter assemblages by modifying sediment characteristics. Core sampling of the eastern (control) and western (disturbed) sides of Beaufort Inlet, North Carolina, twice before and once 8 months after a large (660,000 m3) disposal revealed significant coarsening of sediments and associated changes to assemblages of benthic macroinvertebrates in response to the perturbation. Impacts to sediments and macroinvertebrates were closely correlated and, although greatest where sediment was directly deposited, extended over a wider (at least 1 km to the east) area than the deposition. Of the taxa comprising faunal assemblages, spionid polychaetes were most affected by the disposal, declining in abundance. These results, which tie the deposition and dispersal of coarse sediments on an ebb-tidal delta to changes in benthos, imply a biological cost that may be less than that of direct nourishment of biologically productive intertidal beaches.

LanguageEnglish
Pages530-546
Number of pages17
JournalJournal of Coastal Research
Volume22
Issue number3
DOIs
Publication statusPublished - May 2006
Externally publishedYes

Fingerprint

dredge spoil
benthic infauna
Dredges
Beaches
Sediments
beach
sediment
macroinvertebrate
Coarsening
benthos
deep water
invertebrate
perturbation
Sampling
Water
sampling
resource
cost

Cite this

Bishop, Melanie J. ; Peterson, Charles H. ; Summerson, Henry C. ; Lenihan, Hunter S. ; Grabowski, Jonathan H. / Deposition and long-shore transport of dredge spoils to nourish beaches : Impacts on benthic infauna of an ebb-tidal delta. In: Journal of Coastal Research. 2006 ; Vol. 22, No. 3. pp. 530-546.
@article{6442b698deda4f968e1cab3246367e87,
title = "Deposition and long-shore transport of dredge spoils to nourish beaches: Impacts on benthic infauna of an ebb-tidal delta",
abstract = "Dredged materials from maintenance and deepening of inlets on coastal barriers are typically transported for disposal in deep water or on land. An alternative is to treat dredged materials as a resource, placing them on the ebb-tidal delta or subtidal shoals at depths where they are retained within the long-shore transport system and can nourish eroding down-drift beaches. Deposition of sediments onto subtidal shoals may, however, bury and selectively kill populations of benthic invertebrates, or indirectly alter assemblages by modifying sediment characteristics. Core sampling of the eastern (control) and western (disturbed) sides of Beaufort Inlet, North Carolina, twice before and once 8 months after a large (660,000 m3) disposal revealed significant coarsening of sediments and associated changes to assemblages of benthic macroinvertebrates in response to the perturbation. Impacts to sediments and macroinvertebrates were closely correlated and, although greatest where sediment was directly deposited, extended over a wider (at least 1 km to the east) area than the deposition. Of the taxa comprising faunal assemblages, spionid polychaetes were most affected by the disposal, declining in abundance. These results, which tie the deposition and dispersal of coarse sediments on an ebb-tidal delta to changes in benthos, imply a biological cost that may be less than that of direct nourishment of biologically productive intertidal beaches.",
author = "Bishop, {Melanie J.} and Peterson, {Charles H.} and Summerson, {Henry C.} and Lenihan, {Hunter S.} and Grabowski, {Jonathan H.}",
year = "2006",
month = "5",
doi = "10.2112/03-0136.1",
language = "English",
volume = "22",
pages = "530--546",
journal = "Journal of Coastal Research",
issn = "0749-0208",
publisher = "Coastal Education Research Foundation Inc.",
number = "3",

}

Deposition and long-shore transport of dredge spoils to nourish beaches : Impacts on benthic infauna of an ebb-tidal delta. / Bishop, Melanie J.; Peterson, Charles H.; Summerson, Henry C.; Lenihan, Hunter S.; Grabowski, Jonathan H.

In: Journal of Coastal Research, Vol. 22, No. 3, 05.2006, p. 530-546.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Deposition and long-shore transport of dredge spoils to nourish beaches

T2 - Journal of Coastal Research

AU - Bishop, Melanie J.

AU - Peterson, Charles H.

AU - Summerson, Henry C.

AU - Lenihan, Hunter S.

AU - Grabowski, Jonathan H.

PY - 2006/5

Y1 - 2006/5

N2 - Dredged materials from maintenance and deepening of inlets on coastal barriers are typically transported for disposal in deep water or on land. An alternative is to treat dredged materials as a resource, placing them on the ebb-tidal delta or subtidal shoals at depths where they are retained within the long-shore transport system and can nourish eroding down-drift beaches. Deposition of sediments onto subtidal shoals may, however, bury and selectively kill populations of benthic invertebrates, or indirectly alter assemblages by modifying sediment characteristics. Core sampling of the eastern (control) and western (disturbed) sides of Beaufort Inlet, North Carolina, twice before and once 8 months after a large (660,000 m3) disposal revealed significant coarsening of sediments and associated changes to assemblages of benthic macroinvertebrates in response to the perturbation. Impacts to sediments and macroinvertebrates were closely correlated and, although greatest where sediment was directly deposited, extended over a wider (at least 1 km to the east) area than the deposition. Of the taxa comprising faunal assemblages, spionid polychaetes were most affected by the disposal, declining in abundance. These results, which tie the deposition and dispersal of coarse sediments on an ebb-tidal delta to changes in benthos, imply a biological cost that may be less than that of direct nourishment of biologically productive intertidal beaches.

AB - Dredged materials from maintenance and deepening of inlets on coastal barriers are typically transported for disposal in deep water or on land. An alternative is to treat dredged materials as a resource, placing them on the ebb-tidal delta or subtidal shoals at depths where they are retained within the long-shore transport system and can nourish eroding down-drift beaches. Deposition of sediments onto subtidal shoals may, however, bury and selectively kill populations of benthic invertebrates, or indirectly alter assemblages by modifying sediment characteristics. Core sampling of the eastern (control) and western (disturbed) sides of Beaufort Inlet, North Carolina, twice before and once 8 months after a large (660,000 m3) disposal revealed significant coarsening of sediments and associated changes to assemblages of benthic macroinvertebrates in response to the perturbation. Impacts to sediments and macroinvertebrates were closely correlated and, although greatest where sediment was directly deposited, extended over a wider (at least 1 km to the east) area than the deposition. Of the taxa comprising faunal assemblages, spionid polychaetes were most affected by the disposal, declining in abundance. These results, which tie the deposition and dispersal of coarse sediments on an ebb-tidal delta to changes in benthos, imply a biological cost that may be less than that of direct nourishment of biologically productive intertidal beaches.

UR - http://www.scopus.com/inward/record.url?scp=33646753882&partnerID=8YFLogxK

U2 - 10.2112/03-0136.1

DO - 10.2112/03-0136.1

M3 - Article

VL - 22

SP - 530

EP - 546

JO - Journal of Coastal Research

JF - Journal of Coastal Research

SN - 0749-0208

IS - 3

ER -