Relevant bibliographies by topics / Effect of dredging

Academic literature on the topic 'Effect of dredging'

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Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Effect of dredging"

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Zhong, Ji-Cheng, Ju-Hua Yu, Xiao-Lan Zheng, Shuai-Long Wen, De-Hong Liu, and Cheng-Xin Fan. "Effects of Dredging Season on Sediment Properties and Nutrient Fluxes across the Sediment–Water Interface in Meiliang Bay of Lake Taihu, China." Water 10, no. 11 (November 8, 2018): 1606. http://dx.doi.org/10.3390/w10111606.

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The influence of dredging season on sediment properties and nutrient fluxes across the sediment–water interface remains unknown. This study collected sediment cores from two sites with different pollution levels in Meiliang Bay, Taihu Lake (China). The samples were used in simulation experiments designed to elucidated the effects of dredging on internal loading in different seasons. The results showed that dredging the upper 30 cm of sediment could effectively reduce the contents of organic matter, total nitrogen, and total phosphorus in the sediments. Total biological activity in the dredged sediment was weaker (p < 0.05) than in the undredged sediment in all seasons for both the Inner Bay and Outer Bay, but the effect of 30-cm dredging on sediment oxygen demand was negligible. Dredging had a significant controlling effect on phosphorus release in both the Inner Bay and Outer Bay, and soluble reactive phosphorus (SRP) fluxes from the dredged cores were generally lower (p < 0.05) than from the undredged cores. In contrast, NH4+-N fluxes from the dredged cores were significantly higher (p < 0.05) than from the undredged cores in all seasons for both sites, this indicates short-term risk of NH4+-N release after dredging, and this risk is greatest in seasons with higher temperatures, especially for the Inner Bay. Dredging had a limited effect on NO2−-N and NO3−-N fluxes at both sites. These results suggest that dredging could be a useful approach for decreasing internal loading in Taihu Lake, and that the seasons with low temperature (non-growing season) are suitable for performing dredging projects.
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Boulcott, Philip, Colin P. Millar, and Rob J. Fryer. "Impact of scallop dredging on benthic epifauna in a mixed-substrate habitat." ICES Journal of Marine Science 71, no. 4 (January 3, 2014): 834–44. http://dx.doi.org/10.1093/icesjms/fst197.

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Abstract Experimental scallop dredging was conducted to assess the vulnerability of emergent epifauna on hard substrates. Three sites were sampled before and after dredging to examine changes in the coverage of faunal turf (hydroid and bryozoan) assemblages and the composition of the wider epifaunal community. Each site had an “impact” box that was dredged, a control box that was in an area that was still open to fishing, and a control box in a special area of conservation (SAC) that had not been fished for two years. Community composition differed significantly after dredging in two of the three sites, with dredged communities becoming less similar to those in the SAC. There was no clear evidence that dredging in the impact boxes reduced the coverage of faunal turfs on hard substrates. However, the coverage of faunal turfs on hard substrates in the SAC was typically greater than in areas that were still being fished commercially, consistent with a dredging effect. The results highlight the role that substrate morphology might play in modifying the severity of dredging effects. This has relevance to marine spatial management, as it suggests that emergent epifauna living on hard substrates that are morphologically suited to dredging, such as pebble and cobble substrates, could be particularly vulnerable to dredging.
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Garcia Renteria, Francisco Fernando, and Mariela Patricia Gonzalez Chirino. "Effect of bathymetric changes on residence time in Buenaventura bay (Colombia)." DYNA 86, no. 211 (October 1, 2019): 241–48. http://dx.doi.org/10.15446/dyna.v86n211.79649.

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In order to study the effects of dredging on the residence time of the water in Buenaventura Bay, a 2D finite elements hydrodynamic model was coupled with a particle tracking model. After calibrating and validating the hydrodynamic model, two scenarios that represented the bathymetric changes generated by the dredging process were simulated. The results of the comparison of the simulated scenarios, showed an important reduction in the velocities fields that allow an increase of the residence time up to 12 days in some areas of the bay. In the scenario without dredging, that is, with original bathymetry, residence times of up to 89 days were found.
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Adesina, Thomas Kehinde, and Ogunnowo Aderonke Adunola. "Perceived Effects of Sand Dredging on Livelihood Diversification of Artisanal Fisher Folks in Lagos State, Nigeria." Agricultura Tropica et Subtropica 50, no. 2 (June 27, 2017): 71–79. http://dx.doi.org/10.1515/ats-2017-0008.

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AbstractThe study examined perceived effects of sand dredging activities on livelihood diversification of artisanal fisher folks in Lagos State, Nigeria. Multi-stage sampling procedure was used to select respondents for the study. Purposively, Eti-Osa, Ibeju-Lekki, Epe and Ikorodu local Government Areas (LGAs) were selected for intensive dredging activities. Registered artisanal fishermen in these LGAs were 310, 350, 380 and 320, respectively. Twenty percent of the population in each LGAs were selected using simple random sampling technique to arrive at 272 respondents interviewed for the study. An interview schedule guide was used to elicit information on respondents’ socio-economic characteristics, knowledge, livelihood diversification and perception of the sand dredging effect on fishing activities. Data were analyzed using descriptive statistics, Pearson Product Moment Correlation and independent sample t-test. The mean age of fisher folks was 37 ± 8 years, 92.1 % of them were males, 81.4 % were married and had households’ size ranging from 1 to 16 persons. Over 50 % of the respondents had no formal education. Monthly income of fisher folks in the study area ranged from ₦5, 000 to ₦60, 000 with a mean income of ₦22, 892 ± 13,564 and majority (92.9 %)were members of a social group. Respondents diversified most into off-farm activities such as commercial bike riding, security and technician services. Slightly above half (55.7 %) perceived sand dredging as having a negative effect on fishing activities. Results on inferential statistic revealed that a significant relationship existed between knowledge of sand dredging effect on fishing activities (r = 0.35), monthly income (r = −0.181) and social group (χ2= 2.886) and perceived effects of sand dredging on fishing activities. Deliberate policy drive to mitigate sand dredging practices is required to forestall the negative effect on livelihood diversification of the artisanal fisher folks. Consequently, the artisanal fishery contribution to total Gross Domestic Product (GDP), employment generation and total domestic fish production will be enhanced.
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Campmans, G. H. P., P. C. Roos, N. R. Van der Sleen, and S. J. M. H. Hulscher. "Modeling tidal sand wave recovery after dredging: effect of different types of dredging strategies." Coastal Engineering 165 (April 2021): 103862. http://dx.doi.org/10.1016/j.coastaleng.2021.103862.

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Barry, Jon, Sian Boyd, and Robert Fryer. "Modelling the effects of marine aggregate extraction on benthic assemblages." Journal of the Marine Biological Association of the United Kingdom 90, no. 1 (August 19, 2009): 105–14. http://dx.doi.org/10.1017/s0025315409990737.

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This paper develops models of the initial impact of marine aggregate extraction on a benthic assemblage. We predict the effect of dredging on species numbers and abundance assuming spatial randomness of individuals. We extend the model to allow for spatial clustering of individuals using a Matern process. Data from a controlled field experiment are used to develop a framework for estimating species reduction. This involves modelling the spatial pattern of individuals before dredging using a Matern process, the impact of dredging at an individual level, and the probability that a species is not seen in a post-dredging survey. The framework was used to estimate that, of the 41 species that were seen in a pre-dredging survey but not in a post-dredging survey, between 0 and 14 were eliminated (with 95% likelihood) rather than escaped detection. The most likely number eliminated was 4.
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Jicheng, ZHONG, LIU Guofeng, FAN Chengxin, BAI Xiuling, LI Bao, ZHANG Lu, and DING Shiming. "Environmental effect of sediment dredging in lake: Ⅲ. Influence of dredging on denitrification in sediments." Journal of Lake Sciences 21, no. 4 (2009): 465–73. http://dx.doi.org/10.18307/2009.0403.

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Irawan, Dani. "Effect of Dredging Rate, Sintering Time, Cooling Media on Corrosion Results of Carbon Steel Dredging." International Journal of Science, Engineering and Information Technology 5, no. 02 (July 27, 2021): 254–59. http://dx.doi.org/10.21107/ijseit.v5i02.6023.

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Metal reinforcement that has an impact on improving mechanical properties can occur in various ways, including by strain hardening mechanisms, solid solutions, second phase, prespitations, disperse, grain refinement and texture. In recent years, another method has been developed to obtain good mechanical properties without adding alloy elements, namely by the method of comprehensive plastic deformation (Severe Plastic Deformation). The purpose of this research is to conduct a study of rolling using medium carbon steel with a treatment temperature above recrystallization, rolling rate, sintering time, cooling media as an effort to develop and design new innovations about steel structures being rolled. The study of developing rolling techniques that can be applied in industry and can be applied as learning material / media in higher education requires structured research stages. The best impact value from this temper process is a temperature of 550 ° C for 1 hour where the impact value is 1.58 J / mm² with air conditioning media. In the rolling process above the recrystallization temperature 800 ° C deformation 20% the impact value is 1.7 J / mm² where the toughness indicates a ductile fracture while the deformation is 10% the impact value
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McLaverty, C., OR Eigaard, GE Dinesen, H. Gislason, A. Kokkalis, AC Erichsen, and JK Petersen. "High-resolution fisheries data reveal effects of bivalve dredging on benthic communities in stressed coastal systems." Marine Ecology Progress Series 642 (May 28, 2020): 21–38. http://dx.doi.org/10.3354/meps13330.

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Commercial dredging for blue mussels (Mytilus edulis) and oysters (Ostrea edulis, Crassostrea gigas) constitute the main bivalve fisheries in Denmark. These activities predominantly take place in Limfjorden, a large microtidal sound, and in the Inner Danish waters. Both areas are shallow, estuarine, receive high nutrient inputs from agriculture, and are of nature conservation interest (Natura 2000 sites), thus presenting challenges for an ecosystem approach to fisheries management. Using high-resolution fisheries data (~10 m), we investigated the effects of bivalve dredging on benthic communities at both local (Natura 2000 site) and regional (fishery-wide) scales. Regionally, our results showed that dredging intensity correlated with shifts in species composition and reduced community biomass. We were, however, unable to detect an effect of dredging on community density, trait richness, and trait composition. These metrics were significantly related to other environmental drivers, such as sediment organic content (negative) and mussel bed biomass (positive). At the local scale, the observed relationships between dredging, biomass, and species composition varied significantly. This occurred as dredging impacts were greater in areas that contained suitable reference conditions and experienced relatively low levels of disturbance. By contrast, communities which experienced high nutrient loading, regular anoxic events, and high natural variability were relatively unaffected by dredging. Our results therefore highlight the importance of spatial scales in fishing impact estimations. Furthermore, we demonstrate how targeted sampling, high-resolution fisheries data, and suitable reference areas can be used to detect fishery effects in coastal areas that are highly stressed by eutrophication.
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Islam, Md Kabirul, Numan Al Kibriya, and Md Maruf Dustegir. "Impact Analysis of Sand Dredging from Alluvial Tidal River." E3S Web of Conferences 40 (2018): 03036. http://dx.doi.org/10.1051/e3sconf/20184003036.

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The Government of Bangladesh has planned to make a large build up area (BUA) in a newly developed sedimentary point bar (locally known as ‘Char’) at Lebukhali along the northern bank of Payra river in the southern part of the country. From a study it was revealed that, this sedimentary bar has to be raised by 3.45 meters from MSL to keep it free from any extreme events (like tidal and storm surge effects) for 100 years return period. Accordingly, it was planned to collect the required filling material (estimated 57.6 million m3 of sand/soil) by dredging the same river bed. In Bangladesh dredging of river is very popular and widely undertaken to collect filling and construction material, but its adverse impact on river bed, bank and adjacent areas are hardly probed. This study aimed at analyzing the adverse impacts of dredging from Payra River bed. Four alternative sand bars have been identified as dredging area at varying distances located both upstream and downstream of the proposed site. The dredging impacts were analyzed for different boundary conditions. The study is based on physical survey (topographic and bathymetric surveys), historical data and numerical model analysis. Numerical model is applied through Delf 3D to investigate the impact on flow parameters: flood depth and velocity magnitude. Continuous field visit and observations were made through last one year to observe real impact. The analysis revealed that dredging of any of the bars have resulted changes in flow field. The distance of dredging point does not control the flow field rather the dredging volume, depth and upstream conditions determine the effect on bank erosion. As such, the dredging locations have been prioritized considering the least possible effects on river bank erosion and founded that little erosion is taking place for both upstream and downstream region. However, the long term impacts in other areas of the river need to be investigated as the time pass.
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Dissertations / Theses on the topic "Effect of dredging"

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n, Hussin Wan Mohd Rauhan. "Measurement of changes in marine benthic ecosystem function following physical disturbance by dredging." Thesis, University of St Andrews, 2012. http://hdl.handle.net/10023/2838.

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Measuring the impact of physical disturbance on macrofaunal communities and sediment composition is important given the increased demand for the exploitation and disturbance of marine ecosystems. The aim of the present investigation was to provide a comprehensive study about the extent to which the disturbance (especially aggregate dredging) may affect benthic ecosystem function. The first part of the thesis concerns a field investigation of the impacts of dredging on the benthic community and related ecosystem function which was measured by different approaches including traditional methods based on benthic community structure and a more novel approach based on the functional traits of benthic organisms. The assessment was done by comparing dredged sites (Area 222, southeast England) with nearby undisturbed reference sites from the years 2001 to 2004 and in 2007. In general, low dredging intensity did not appear to impose great impacts on the benthic community and related ecosystem function compared to the higher intensity activity. Most of the analyses suggested that the community at the high dredging intensity site had yet to recover at the end of this study period. Among many factors related to the recovery of the benthic community was sediment composition where gravel deposits appeared to support a faster biological recovery. Meanwhile, the recovery of species with specific traits, such as tube-building and filter feeding also indicate a faster recovery for the whole community. The experimental work to determine different impacts of Hediste diversicolor on its surrounding depending on its relative size is discussed in Appendix 1.
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Selden, Justin D. "The Effect of Dredging on Fish Communities in Agricultural Streams in Crawford, Sandusky and Seneca Counties of Ohio." University of Toledo / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1372421206.

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Tamuno, P. B. L. "Eco-livelihood assessment of inland river dredging : the Kolo and Otuoke creeks, Nigeria, a case study." Thesis, Loughborough University, 2005. https://dspace.lboro.ac.uk/2134/2334.

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Conventionally environmental assessments (EAs) have been carried out to enhance the understanding of the environment and for the purpose of developing appropriate environmental management and protection strategies. There are, however, limitations to the application of traditional EA approaches, particularly in rural communities in the developing world, where livelihood is dependent on common pool resources (CPRs), and baseline data are inadequate or unavailable. Eco-livelihood assessment (EcLA) is an adaptive approach that integrates a people focused sustainable livelihood approach with ecological assessment, as well as exploring traditional eco-livelihood knowledge (TELK). EcLA is identified as a promising EA tool that could help environmental professionals in planning for equitable development. This approach has been used in the Kolo and Otuoke Creeks, Niger Delta, Nigeria to investigate the ecological impact of dredging that may impact on livelihoods in such a rural setting. Ecological and social surveys have been carried out in four communities in the Study Area; two Test communities and two Reference communities (two communities from each study creek). The information collected from the social survey includes TELK, and has been used to build up a baseline scenario of the Study Area. Abundance and diversity of fish are good indicators of the eco-livelihood impacts of inland river dredging. The research shows that livelihood characteristics, river use profile, fish species diversity and abundance are very similar among all four sample communities. In addition, all sample communities have been associated with similar natural and human induced environmental consequences except that the Test communities have had river sections dredged for the purpose of land reclamation representing the baseline scenario. The analysis of the results of the ecological survey shows a difference in fish catch per unit effort, catch per unit hour, and species diversity between the Test and Reference communities, this have been attributed to the impacts of inland river dredging. The study shows that TELK has a place in environmental assessment, and that eco-livelihood assessment is one promising environmental assessment approach that could be used in areas where livelihood is strongly dependent on common pool resources.
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Knight, Peter David, and n/a. "Where did we go wrong? : a critical assessment of management in the Bluff Oyster Fishery." University of Otago. School of Surveying, 2008. http://adt.otago.ac.nz./public/adt-NZDU20081218.160813.

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More than a century of dredging for oysters in the Foveaux Strait has resulted in a decimated fishery. In 1999 the Parliamentary Commissioner for the Environment asked the question: Where did we go wrong? This thesis provides answers to this question by presenting information provided by the Bluff oyster fishermen. In order to gain as much exposure to the community of fishermen as possible, a cumulative period of approximately six months was spent living in the town of Bluff between 2002 and 2007. During this time relationships were built with key informants, and a total of more than 50 community members were interviewed. The thesis describes the practical knowledge of the oyster fishermen, and places it in the context of more that 40 years of modem scientific studies concerned with the fishery. The finding are that since 1996 when the Quota Management System was introduced in the fishery, the most knowledgeable and responsible people in the fishery have been systematically excluded from roles in management. The practical knowledge of fishermen has been discounted in an industry and government led management system, which is an elaborate justification for continued maximum exploitation of the fishery. The theoretical contribution of the thesis lies in its description of belonging as a factor as important as that of property-rights in a sustainable resource system. The practical knowledge and conservation-mindedness of the fishery elders are characteristics of belonging, but not necessarily of ownership. Fishery management should recognize belonging as cultural capital, and make use of it under the present system (i.e. the Quota Management System) by according fishermen rights of management and access to the oyster fishery.
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Croft, Alex. "The effects of thin layer dredge material disposal on tidal marsh processes, Masonboro Island, NC /." Electronic version (PDF), 2003. http://dl.uncw.edu/etd/2003/crofta/alexcroft.html.

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Milburn, Elizabeth Anne. "The effects of dredging on dissolved oxygen in agricultural waterways in King County, Washington." Online access for everyone, 2007. http://www.dissertations.wsu.edu/Thesis/Spring2007/E_Milburn_030907.pdf.

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MacDonald, David Simpson. "Ecological studies on the effects of scallop dredging on the benthos of the North Irish Sea." Thesis, University of Liverpool, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.333574.

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Barber, Michael R. "Effects of Hydraulic Dredging and Vessel Operation on Atlantic Sturgeon Behavior in a Large Coastal River." VCU Scholars Compass, 2017. http://scholarscompass.vcu.edu/etd/4792.

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The tidal James River, a focus of VCU's Atlantic Sturgeon program, supports both commercial shipping and hydraulic dredging. These anthropogenic threats present documented but preventable sources of mortality to the endangered species. Using three separate VEMCO Positioning System (VPS) receiver arrays, spatial data of previously-tagged fish were collected. ArcGIS and Programita software were used to analyze fish spatial distributions in the presence and absence of potential threats, using additional data including automatic identification system (AIS) vessel locations, vessel passages compiled using camera footage, and dredge records provided by the US Army Corps of Engineers. The data showed a change in distribution associated with vessels that varied according to river width but not vessel type. Dredging was associated with differences in spatial distribution, but more clearly for adults than sub-adults. The responses of Atlantic Sturgeon provide information necessary to propose potential threat mitigations, including seasonal restrictions for both vessels and dredging.
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Morris, Stephanie M. "Effects of Dredging-Induced Sedimentation and Turbidity on Two Species of Stony Corals of Southeast Florida." NSUWorks, 1993. http://nsuworks.nova.edu/occ_stuetd/351.

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Sedimentation parameters, turbidity, extension (linear) growth, bleaching and polyp expansion were examined prior to, during, and after the dredge and fill activities associated with the first renourishment of Hollywood and Hallandale beaches, 1991. During the project, approximately 1.1 million cubic yards of beach compatible material was taken from two offshore borrow areas and placed on 5.3 miles of beach. Treatment stations were at offshore (adjacent to the borrow area) and nearshore (adjacent to fill area) locations. Control stations were placed at least 3km north, offshore of John U. Lloyd Beach State Recreation Area. Two coral species abundant in this area, Solenastrea bournoni and Dichocoenia stokesii, were monitored monthly on each reef for signs of bleaching and polyp expansion, indicators of stress and surface clearing ability respectively. After dredging was completed, the corals were collected for growth analysis (linear extension) by the Alizarin stain method. At treatment stations, associated with dredging, a significant decrease in extension growth rate in S. bournoni but not D. stokesii occurred. A decrease in fossa length of D. stokesii suggested that dredging effects caused a change in columella shape. Bleaching occurred in many of the colonies but may have been caused by an unknown factor. Polyp expansion, a means of sediment rejection, did not correlate with the proximity to dredging. The corals may be relying on other means of sediment removal. This study suggests that the effects of dredging on stony corals are species specific.
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Avila, Christian L. "Effects Associated with Dredging for Beach Renourishments on Reef Fish Communities Offshore of Miami-Dade County, Florida:." NSUWorks, 2006. http://nsuworks.nova.edu/occ_stuetd/251.

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Beach erosion is an ongoing problem in South Florida. Beach replenishment has been the primary means of maintaining these economically important beaches, and dredging offshore sand deposits, adjacent to reef tracts, has been the pervasive method since the 1970's. Over the past ten years, greater attention has been paid to potential impacts dredging can have on adjacent reef communities, which has led to increased monitoring efforts. With the increase in monitoring efforts, scope has expanded from a strict focus on the benthic community to include the fish communities. This study evaluates the effects of dredging on reef fish communities associated with two separate beach replenishment projects, offshore of Miami-Dade County, Florida, U.S.A. Monitoring programs were developed and conducted by the Miami-Dade, Department of Environmental Resources Management (DERM). Monitoring took place between March 1997 and September 2000, with one project in northern portion of the county, off offshore of Golden Beach, and the other in the southern portion offshore of Key Biscayne. Both monitoring programs employed a Before After Control Impact design, with established test and control reef stations. Eight reef fish visual point count censuses (Bohnsack and Bannerot, 1986) were performed at each station prior to dredging, immediately following dredging, and three periods at bi-quarterly intervals after that. In general evaluations of both project,s showed no indications that dredging activities had major impacts on the fish communities of adjacent reefs. For the Golden Beach project, there was one aspect of the analysis, which may be indicative of dredging related impacts; was species richness at one test station declined significantly following dredging activities (ANOVA p=0.047). However, in terms of abundance, diversity and Multidimensional scaling (MDS) plots of the Bray-Curtis dissimilarity index did not indicate that dredging activities impacted the test station. During the monitoring period of the Key Biscayne project, the south Florida region was impacted by two tropical storm events, which obscures the isolation of impacts associated with dredging. Changes in the reef fish communities, consistent with the impact and recovery of the tropical storms are evident in species richness, abundance, and MDS plots of the Bray-Curtis dissimilarity index, at both the test and control stations.
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Books on the topic "Effect of dredging"

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Alzieu, Claude. Dredging and marine environment. Plouzané [France]: Ifremer, 2005.

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W, Moore David. Chronic sublethal effects of San Francisco Bay sediments on Nereis (Neanthes) arenaceodentata: Effect of food ration on sediment toxicity. Vicksburg, MS: US Army Corps of Engineers, Waterways Experiment Station, 1993.

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Moore, David W. Chronic sublethal effects of San Francisco Bay sediments on Nereis (Neanthes) arenaceodentata: Effect of storage time on sediment toxicity. Vicksburg, MS: US Army Corps of Engineers, Waterways Experiment Station, 1994.

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United, States Congress House Committee on Merchant Marine and Fisheries Subcommittee on Oceanography Gulf of Mexico and the Outer Continental Shelf. The federal dredge permitting process and its effect on ports of the Gulf Coast region: Hearing before the Subcommittee on Oceanography, Gulf of Mexico, and the Outer Continental Shelf of the Committee on Merchant Marine and Fisheries, House of Representatives, One Hundred Third Congress, first session ... December 13, 1993--Houston, Texas. Washington: U.S. G.P.O., 1994.

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United States. Congress. House. Committee on Merchant Marine and Fisheries. Subcommittee on Oceanography, Gulf of Mexico, and the Outer Continental Shelf. The federal dredge permitting process and its effect on ports of the Gulf Coast region: Hearing before the Subcommittee on Oceanography, Gulf of Mexico, and the Outer Continental Shelf of the Committee on Merchant Marine and Fisheries, House of Representatives, One Hundred Third Congress, first session ... December 13, 1993, Houston, Texas. Washington: U.S. G.P.O., 1994.

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Gouin, Hélène. Suivi des communautés ichtyologiques au site de mise en dépôt de sédiments de dragage de l'île Madame en 1999. Québec: Société de la faune et des parcs du Québec, 2000.

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Lachance, Stéphanie. Suivi des communautés ichtyologiques au site de mise en dépôt de sédiments de dragage de l'Île Madame en 2000: Rapport d'étape. Québec: Société de la faune et des parcs du Québec, 2001.

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Holmes, John A. The impact of dredging and spoils disposal on Hamilton Harbour fisheries: Implications for rehabilitation. Burlington, Ont: Great Lakes Fisheries Research Branch, Canada Centre for Inland Waters, 1986.

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Chomichuk, G. M. B., artist, ed. Hope and the walleye. [Winnipeg, Manitoba]: Alchemical Press, 2009.

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W, Moore David. Chronic sublethal effects of San Francisco Bay sediments on "Nereis (Neanthes) Arenaceodentata": Nontreatment factors. [Vicksburg, Miss: U.S. Army Engineer Waterways Experiment Station, 1992.

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Book chapters on the topic "Effect of dredging"

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Bradshaw, C., L. O. Veale, A. S. Hill, and A. R. Brand. "The effect of scallop dredging on Irish Sea benthos: experiments using a closed area." In Coastal Shellfish — A Sustainable Resource, 129–38. Dordrecht: Springer Netherlands, 2001. http://dx.doi.org/10.1007/978-94-010-0434-3_13.

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Grinwis, A. W., and L. G. C. M. Urlings. "Pollution-Controlling Effect of Adsorbing Materials on the Leaching of Pollutants from Dredging Spoil Depots." In Environmental Technology, 627–29. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3663-8_80.

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Thomsen, Frank, Fabrizio Borsani, Douglas Clarke, Christ de Jong, Pim de Wit, Fredrik Goethals, Martine Holtkamp, et al. "WODA Technical Guidance on Underwater Sound from Dredging." In The Effects of Noise on Aquatic Life II, 1161–66. New York, NY: Springer New York, 2016. http://dx.doi.org/10.1007/978-1-4939-2981-8_145.

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Lloyd Jones, Dafydd, Joni Backstrom, and Ian Reach. "Regional Environmental Assessment of Marine Aggregate Dredging Effects: The UK Approach." In Environmental Management and Governance, 253–72. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-06305-8_10.

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Zhao, Shuang, Bin Huang, and Bin Guo. "Discussion on Water Source Reservoir Dredging Effects on Water Quality—Case Study of Duihekou Reservoir." In Geo-Informatics in Resource Management and Sustainable Ecosystem, 514–19. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-49155-3_53.

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Hovenkamp-Obbema, I. R. M., and W. Fieggen. "The effects of dredging and fish stocking on the trophic status of shallow, peaty ditches." In Restoration and Recovery of Shallow Eutrophic Lake Ecosystems in The Netherlands, 225–33. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2432-4_21.

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Nordstrom, Karl F. "Effects of Shore Protection and Dredging Projects on Beach Configuration Unjettied near Tidal Inlets in New Jersey." In Hydrodynamics and Sediment Dynamics of Tidal Inlets, 440–54. New York, NY: Springer New York, 1988. http://dx.doi.org/10.1007/978-1-4757-4057-8_23.

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Nordstrom, Karl F. "Effects of shore protection and dredging projects on beach configuration unjettied near tidal inlets in New Jersey." In Hydrodynamics and Sediment Dynamics of Tidal Inlets, 440–54. Washington, D. C.: American Geophysical Union, 1988. http://dx.doi.org/10.1029/ln029p0440.

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Badalamenti, Fabio, Giuseppe Di Carlo, Giovanni D’Anna, Michele Gristina, and Marco Toccaceli. "Effects of dredging activities on population dynamics of Posidonia oceanica (L.) Delile in the Mediterranean sea: the case study of Capo Feto (SW Sicily, Italy)." In Marine Biodiversity, 253–61. Dordrecht: Springer Netherlands, 2006. http://dx.doi.org/10.1007/1-4020-4697-9_21.

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Jarvis, Adrian. "Sand, Silt and Sewage: The Work of the Board’s Dredgers." In In Troubled Times. Liverpool University Press, 2003. http://dx.doi.org/10.5949/liverpool/9780973007367.003.0007.

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This chapter explores the necessity of dredging in the Port of Liverpool, and the development of dredging technology from the mid-nineteenth to early-twentieth century. It considers the effect dredging had on the port, the methods adopted by the Mersey Docks and Harbours Board, and concludes by stating that dredging was necessary in order to appease customers and keep the port navigable. Jarvis rounds out his analysis, however, by asserting that dredging did not take place during wartime and the port was not compromised as a result.
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Conference papers on the topic "Effect of dredging"

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Schroeder, Paul R., and Nadim M. Aziz. "Effect of Vadose Zone on CDF Leachate Concentration." In Third Specialty Conference on Dredging and Dredged Material Disposal. Reston, VA: American Society of Civil Engineers, 2003. http://dx.doi.org/10.1061/40680(2003)33.

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Miller, Herman C., Jesse E. McNinch, John M. Land, Grace M. Battisto, and Jack E. Davis. "Fate and Effect of an Experimental Mixed-Sediment Mound." In Third Specialty Conference on Dredging and Dredged Material Disposal. Reston, VA: American Society of Civil Engineers, 2003. http://dx.doi.org/10.1061/40680(2003)67.

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Lu, Yu, Ankang Hu, and Xin Chang. "Hydrodynamic Characteristics Analysis on the Dredging Dustpan Internal Flow Field Based on CFD." In ASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/omae2016-54074.

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Computational fluid dynamics (CFD) plays an important role in predicting the fluid characteristics throughout the engineering practice. With the developing of computers and CFD software, it has become a powerful tool in the hydrodynamics area. In this paper, the hydrodynamic characteristics of dredging dustpan internal flow field on the coastal engineering are further studied using CFD as a modeling and calculation tool. It is implemented in such way that the ICEM CFD software has been firstly employed to establish the full dredging dustpan model and gridding, the numerical simulation of internal flow field is then accurately performed by the FLUENT code under the conditions of different slurry concentration and particle diameter working on the dredging dustpan. Based on the calculation results, the effect of different slurry concentration and particle diameter on the dredging and transporting efficiency of dustpan is presented and discussed. It is shown that when the slurry concentration is low, particle diameter plays a leading role, and suction efficiency is proportional to particle diameter. However, the slurry concentration plays an important role and is inversely proportional to the suction efficiency as it is in a high level. It has been demonstrated that the present study is efficient and accurate for the numerical simulation of the dredging dustpan internal flow field.
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Hsu, Tai-Wen, and Hsien-Kuo Chang. "Experimental Studies on the Effect of the Dredging on Chang-Hwa Reclamation Area, Taiwan." In 24th International Conference on Coastal Engineering. New York, NY: American Society of Civil Engineers, 1995. http://dx.doi.org/10.1061/9780784400890.215.

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MOHIUDDIN, FARUQ AHMED. "EFFECT OF INCREASED DREDGING LENGTH OF THE GORAI RIVER OFF-TAKE ON LEAN SEASON FLOW OF THE GORAI RIVER IN BANGLADESH." In Proceedings of the 13th IAHRߝ;APD Congress. World Scientific Publishing Company, 2002. http://dx.doi.org/10.1142/9789812776969_0023.

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Matoušek, Václav, Mikoláš Kesely, Jiři Konfršt, and Pavel Vlasák. "Effect of Pipe Inclination on Settling Slurry Flow Near Deposition Velocity." In ASME 2018 5th Joint US-European Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/fedsm2018-83423.

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Inclined slurry flows occur often in industrial applications such as mining and dredging. Pipelines transporting slurries contain inclined sections of various lengths and slopes. If the transported slurry is settling slurry then pipe inclination considerably affects flow structure and behavior. We discuss settling slurry flow near and at the deposition limit at which stationary deposit starts to be formed at the bottom of the pipe. In particular, we focus on the effect of the pipe slope on the deposition velocity, and on the solids distribution and manometric hydraulic gradient in flow round the deposition limit. We introduce our new layered model for inclined settling slurry flows and demonstrate its predictive capabilities. Model predictions are verified by our experiment in a laboratory loop. We also introduce our new experimental approach to a detection of the deposition velocity based on radiometric sensing of the change of local concentration of solids at the bottom of a pipe. Our experiments cover a broad range of flow slopes and contain measurements of solids distribution in a pipe cross section. Experimental results show that the degree of flow stratification and frictional pressure drop decrease with the increasing angle of inclination in the ascending pipe while the opposite applies in the descending pipe, which affects the deposition velocity and other related flow parameters. A comparison with model predictions demonstrates that experimentally observed effects of pipe inclination are reproduced well by the layered model. Predicted deposition velocities, pressure drops and solids distributions are in a good agreement with the experimental results and indicate suitability of the model for engineering practice.
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Rokosch, W. Dieter, and Niek J. Berg. "Dredging Efficiently - Dredging Techniques and Its Effects to the Environment." In Third Specialty Conference on Dredging and Dredged Material Disposal. Reston, VA: American Society of Civil Engineers, 2003. http://dx.doi.org/10.1061/40680(2003)97.

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Been, Ken, Rodolfo B. Sancio, Djavid Ahrabian, Walther van Kesteren, Ken Croasdale, and Andrew Palmer. "Subscour Displacement in Clays From Physical Model Tests." In 2008 7th International Pipeline Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/ipc2008-64186.

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A subscour soil displacement model is a key component to determine the safe burial depth of offshore pipelines in ice scoured environments. In order to calibrate numerical models and physical tests carried out in geotechnical centrifuges, 3D ice scour tests were carried out in a dredging flume at a scale approaching that of observed scour depths in the Caspian sea. Two soil failure mechanisms were observed. For steep keels, the soil is mainly pushed up into a mound in front of the keel. For shallow angle keels most of the scoured soil is forced under the keel and to the side of the indentor. Each mechanism results in a different subscour displacement pattern. Subscour displacement equations that include the effect of soil properties and keel angle are presented. While these equations are considered an improvement on existing sub-scour models, there remain limitations to their application in 3D sub-scour until further information relating scour depth and width to soil strength becomes available.
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Macfarlane, Gregor J., Nicholas T. M. Johnson, Lauchlan J. Clarke, Ross J. Ballantyne, and Kevin A. McTaggart. "The Floating Harbour Transhipper: New-Generation Transhipment of Bulk Ore Products." In ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/omae2015-41337.

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Bulk products such as iron ore and coal are usually shipped directly from shore facilities using large bulk carriers. This often involves significant cost due to major dredging operations, long jetties, large storage sheds and the acquisition of large tracts of coastal land. The costs of direct shore to an ocean-going export vessel (OGV) loading often run into billions of dollars — prohibitive for small- to medium-scale mining operations, particularly in remote regions with only distant access to deep water ports. The current industry standard for mitigating these issues is transhipping; the bulk cargo is transported from a smaller shore based facility to the export vessel moored in deep water by a small feeder vessel. Transhipment, while mitigating many of these issues, does introduce other concerns with respect to limiting seastate, environmentally harmful dust and potential spillage during materials transfer. The Australian company Sea Transport Corporation and the Australian Maritime College at the University of Tasmania are developing new technology for bulk ore transhipment: the floating harbour transhipper (FHT). The FHT is essentially a large floating warehouse with an aft well dock to support material transfer operations from the feeder vessel. The major advantages to the mining export industry are in the form of environmental and economic improvements, in some cases completely avoiding expensive dredging while minimising the environmentally invasive onshore infrastructure. In addition, the whole process is enclosed, therefore eliminating grab spillage and dust transport issues common to other transhipping methods. This paper presents an overview of the main hydrodynamic issues currently being investigated: primarily the interaction between multiple floating bodies close to one another in a seaway. The two primary ship-to-ship interactions that are being investigated are the effects experienced by the feeder vessel when it is docking or undocking within the FHT well dock and the interactions between the three vessels when operating in close proximity in an open seaway. A combination of physical scale model experiments and numerical techniques is employed, with a significant portion of the experimental program dedicated to the validation of the numerical simulation codes used to investigate the behaviour of the vessels. ShipMo3D is an object based library developed by DRDC for the purpose of analysing the seakeeping performance of vessels operating in a seaway in either the frequency or time domain. The capabilities of ShipMo3D are applied to this novel application in an attempt to provide realistic simulations of the interaction between the vessels of the FHT system. DualSPHysics, an open source Smoothed Particle Hydrodynamics (SPH) code, is being applied to the domain within the very restricted water environment of the FHT well dock to investigate the fluid flow behaviour and the effect that this has on the feeder vessel when entering/exiting.
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Putranta, Dinariyana Dwi, Ketut Buda Artana, Kriyo Sambodho, and I. Made Ariana. "Risk Assessment on Subsea Gas Pipelines Located at Water Basin of Jetty Area due to Dredging and Operation After Dredging." In ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/omae2013-10358.

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This study addresses risk assessment of 14″ gas pipelines buried closed to jetty area due to the plan to dredge the water basin at jetty area. The dredging plan is aimed to enable a more spacious maneuvering basin at the jetty area to enable larger vessel to be served and easier control of tug boat operation during berthing process. Before dredging, the gas pipeline is located 133 m from the slope. This condition provides enough protection to the gas pipeline since large vessel will not reach the pipeline due to vessel’s draft restriction. After dredging, however, gas pipeline will be located only 49 m away from the slope. The water area after dredging allows larger vessel will be in the vicinity of the pipeline and hence impose risk to the existence of the gas pipeline. Risk to the pipelines due to dredging activities (drop/drag anchor, drop clamshell/object, ship sinking, and ground instability) and due to various vessels operation after dredging (drop/drag anchor, ship sinking, and ship grounding) are assessed by implementing quantitative risk assessment. Hence, this study is focused on the assessment of risk to the 14″ gas pipeline due to dredging activity including risk assessment during operation of the jetty after dredging. Based on pipeline and environmental data, all possible hazards are identified. Some hazards are screened out using ‘Failure Modes and Effects Analysis’ (FMEA) to obtain the list of potential hazards. In order to evaluate the acceptance criteria of all potential risks, the risk profiles are composed according to DNV-RP-F107 “Risk Assessment of Pipeline Protection”. As part of the assessment, geotechnical assessments of submarine landslide due to dredging are also considered. The effective stress approach is implemented to the assessment and submarine slope stability is analyzed using Bishop’s and Janbu’s methods of analysis. The risk profiles for all potential hazards are reported, and simulation results for different slope ratios are given to illustrate the stability of slope configuration during dredging.
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Reports on the topic "Effect of dredging"

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Frey, Ashley, and Lauren Coe. Effect of tropical storms and precipitation on dredging volumes : Houston-Galveston, TX, and Mayport, FL. Engineer Research and Development Center (U.S.), June 2020. http://dx.doi.org/10.21079/11681/37093.

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Bird, Sandra L., and Mark Dortch. Contaminant Modeling. Environmental Effects of Dredging. Fort Belvoir, VA: Defense Technical Information Center, March 1988. http://dx.doi.org/10.21236/ada292982.

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Palermo, Michael R. Environmental Effects of Dredging. Engineer Manual Series on Dredging and Dredged Material Disposal. Fort Belvoir, VA: Defense Technical Information Center, March 1988. http://dx.doi.org/10.21236/ada292912.

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Poindexter-Rollings, Marian E. Environmental Effects of Dredging. Selecting Equipment for Use in Dredged Material Containment Areas. Environmental Effects of Dredging. Fort Belvoir, VA: Defense Technical Information Center, January 1990. http://dx.doi.org/10.21236/ada292707.

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Brannon, James M., Judith C. Pennington, Tommy E. Myers, and Cynthia B. Price. Environmental Effects of Dredging. Factors Affecting Leachate Quality. Fort Belvoir, VA: Defense Technical Information Center, December 1989. http://dx.doi.org/10.21236/ada292915.

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Engler, Robert M., Thomas R. Patin, and Russell F. Theriot. Dredging Operations Technical Support Program. Update of the Corps' Environmental Effects of Dredging Programs (FY 89). Fort Belvoir, VA: Defense Technical Information Center, February 1990. http://dx.doi.org/10.21236/ada218753.

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Havis, Robert N. Environmental Effects of Dredging: Sediment Resuspension by Selected Dredges. Fort Belvoir, VA: Defense Technical Information Center, March 1988. http://dx.doi.org/10.21236/ada292644.

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Engler, Robert M., Tom Wright, Charles R. Lee, and Tom M. Dillon. Environmental Effects of Dredging. Corps of Engineers' Procedures and Policies on Dredging and Dredged Material Disposal (The Federal Standard). Fort Belvoir, VA: Defense Technical Information Center, August 1988. http://dx.doi.org/10.21236/ada292977.

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Higgins, Todd R., and C. R. Lee. Environmental Effects of Dredging: CE Sediment Collection and Analysis Methods. Fort Belvoir, VA: Defense Technical Information Center, July 1987. http://dx.doi.org/10.21236/ada292846.

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Shields, F. D., and Jr. Environmental Effects of Dredging. Economic Optimization of Confined Disposal Area Dimensions. Fort Belvoir, VA: Defense Technical Information Center, May 1989. http://dx.doi.org/10.21236/ada292615.

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