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Dredging

About: Dredging is a research topic. Over the lifetime, 3300 publications have been published within this topic receiving 28325 citations.


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Book
01 Jun 1984
TL;DR: In this article, the basic principles of hydraulic dredging are presented in terms that are easily understood and can be used by operators, government agencies, and members of the legal profession connected with the dredging industry.
Abstract: This fully revised and updated edition presents the basic principles of hydraulic dredging in terms that are easily understood One of the most widely used texts available on dredging, this book is nontheoretical and readable New information on significant technical advances and environmental issues is provided Charts and data have been updated, improved, and simplified, but the fundamentals remain unchanged Theoretical topics include: production rate calculation; dredge efficiency; hydraulic transport factors; maximum dredge production; suction line and digging depth;horsepower vs line length; production charts; dredge cycle; flow regime and friction; cavitation Practical topics include: selecting the dredge type; the cutter; the dredge pump ladder and booster pumps wear in pumps and pipelines auxiliary equipment; instrumentation and automatic control; calculating and bidding the project; use of the personal computer; operation and troubleshooting; environment and the dredge The book is intended for dredge operators, government agencies, and members of the legal profession connected with the dredging industry

35 citations

Journal ArticleDOI
TL;DR: The effects of dredging the seabed for aggregate on benthic functional diversity were assessed using a suite of suitable indices on a recovering macrofaunal assemblage.
Abstract: The effects of dredging the seabed for aggregate on benthic functional diversity were assessed using a suite of suitable indices on a recovering macrofaunal assemblage. Recovery was assessed as the return of a dredged assemblage to a state found in neighbouring undisturbed (reference) sites. In situ sediment screening was permitted during dredging operations; a difference in the sedimentary profile of the seabed between dredged and undisturbed reference sites was also observed. At sites of relatively high and low dredging intensity the sediment appeared more homogenous than reference sites after the selective removal of the coarser component. Initial assessment of the macrofaunal assemblage using univariate analytical techniques suggested a recovery of functional diversity at the low dredging intensity site after two years (according to the Infaunal Trophic Index, Taxonomic Distinctness index and Rao’s Quadratic Entropy coefficient). However, multivariate analyses of the same data and of all indices except Taxonomic Distinctness indicated that assemblages at both high and low dredging intensity sites remained statistically indistinguishable from each other yet markedly different to the assemblage present in the reference area during the four-year study. The study concluded that recovery of functional diversity to a level found in a neighbouring undredged habitat had not occurred at either dredged site five years after the cessation of dredging. It is thought that the damage by dredging to functional diversity and to the capacity of the macrofaunal assemblage to recover is immediate and not so dependent on dredging intensity. The cumulative and wider ranging effects of sediment screening cannot be ignored or dismissed as a contributing factor to the similarities observed. The wider significance of these findings on the regulation of dredging activities is discussed.

34 citations

Journal ArticleDOI
TL;DR: In this article, physical processes and biological data were collected and analyzed at five sand resource areas offshore Alabama to address environmental concerns raised by potential sand dredging for beach replenishment, with borrow site sand volumes ranging from 1.7 to 8.4 × 106 m3.
Abstract: Physical processes and biological data were collected and analyzed at five sand resource areas offshore Alabama to address environmental concerns raised by potential sand dredging for beach replenishment. Nearshore wave and sediment transport patterns were modeled for existing and post-dredging conditions, with borrow site sand volumes ranging from 1.7 to 8.4 × 106 m3. Wave transformation modeling indicated that minor changes will occur to wave fields under typical seasonal conditions and sand extraction scenarios. Localized seafloor changes at borrow sites are expected to result in negligible impacts to the prevailing wave climate at the coast. For all potential sand excavation alternatives at borrow sites offshore Alabama, maximum variation in annual littoral transport between existing conditions and post-dredging configurations was approximately 8 to 10%. In general, increases or decreases in longshore transport rates associated with sand mining at each resource area amounted to about 1 to 2% ...

34 citations

01 Mar 2001
TL;DR: In this article, the feasibility of mining the flood and ebb shoals to serve as sources of material was examined in a dual-jettied inlet located on the south shore of Long Island connecting Shinnecock Bay to the Atlantic Ocean.
Abstract: : Shinnecock Inlet, New York, is a dual-jettied inlet located on the south shore of Long Island connecting Shinnecock Bay to the Atlantic Ocean. The down-drift beach, west of the inlet, experiences chronic erosion, and cost-effective and innovative measures for beach nourishment are being examined by the U.S. Army Engineer District, New York. The feasibility of mining of the flood and ebb shoals to serve as sources of material was examined in this report. Emphasis is on the concept of 'flood-shoal engineering' within an integrated inlet and beach system. Fifteen action alternatives were developed that involved dredging, modification of the jetties, and combined dredging and structural changes. The alternatives were evaluated by their potential changes to navigation conditions, availability of material for placement on the beach, changes to inlet and channel currents that would modify scour and deposition patterns, and changes in current strength near the beach that would modify erosion. The area of compatible material, established for the flood shoal from analysis of core samples, was the targeted mining area for the study and contains approximately 1.8 x 10(exp 6) cu yd of beach-compatible sand. Exploratory alternatives were also evaluated that involved dredging in other locations. Evaluation of alternatives was conducted through circulation, wave, and morphology modeling. A calibrated circulation model was applied to simulate each alternative and compare current strength and patterns to those for the existing condition. Wave modeling was conducted for one alternative that consisted of mining the attachment bar to determine changes in the wave patterns near the shore. Morphology modeling was conducted to calculate the long-term recovery rates of the system to mining of the flood shoal.

34 citations

Journal ArticleDOI
TL;DR: The comparison shows that dredging has both the higher costs and environmental impact, while fixed sand by-passing plants are characterized by the lowest environmental impact and operation costs that are competitive with dredging.

34 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023189
2022438
202170
2020119
2019150
2018131