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Dissertations / Theses on the topic 'Effect of dredging'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

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 b

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2

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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3

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 ecolog

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4

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 commun

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5

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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6

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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7

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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8

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 compile

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9

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. Lloy

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10

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

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11

Panasik, Gina M. "Effects of the addition of dredged sediment to a marsh ecosystem on benthic microalgal biomass /." Electronic version (PDF), 2003. http://dl.uncw.edu/etd/2003/panasikg/ginapanasik.html.

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12

Obergh, Victoria Lee. "Canal Maintenance Effects on Irrigation Water Quality." Thesis, The University of Arizona, 2015. http://hdl.handle.net/10150/582373.

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Canal maintenance, involving mechanical removal of sediments and algal growth from canal basins, is necessary for sustaining the viability of the irrigation water delivery system in the Imperial Valley of California. Maintenance activities, however, disturb canal sediments laden with bacteria and can negatively impact water quality downstream. Our work quantified fecal indicator bacteria (Escherichia coli) and pathogens (Salmonella) in canal water prior to, during, and post-maintenance events. The goal of this study was to construct a post-maintenance time matrix that will allow growers downst

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13

Adda, Michele. "Possible ecological effects of continuous hydraulic sediment removal as an alternative to dredging at a small port entrance (Cervia, northern Adriatic Sea)." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.

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Siltation and sediment accumulation is a problem that affects many ports and harbours worldwide. Usually, dredging is the most common technique to handle this issue, but nowadays there is increasing concern about its several effects and impacts to the marine environment, especially referred to benthic communities, so that the need to find sustainable alternatives is becoming a topic of wide interest. One of these possible alternatives is represented by the so-called sand by-passing plants. In this study, the potential ecological effects of a new sand by-passing plant, called ejectors plant, ha

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14

Robbins, Jena. "Effects of ocean warming, sedimentation, and parental genotype on the post-settlement survival and growth of Acropora cervicornis recruits." Thesis, NSUWorks, 2018. https://nsuworks.nova.edu/occ_stuetd/483.

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Ocean warming and increased sedimentation from coastal activities are major threats to coral persistence. This study assessed the effects of increased temperature and sedimentation on the survival and growth of Acropora cervicornisrecruits. The potential for adults from different regions and genotypes to confer their offspring with higher or lower tolerance to heat and/or sediment was also determined. Gametes were collected and brought to the laboratory for cross fertilization of different genotypes within the regions collected. Larval rearing and settlement were then performed in the laborato

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15

Stephenson, Morgan. "Effects of deposited sediment and turbidity on survival and growth of Orbicella faveolata recruits." Thesis, NSUWorks, 2019. https://nsuworks.nova.edu/occ_stuetd/509.

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Corals are frequently exposed to elevated turbidity and deposited sediment caused from coastal construction, dredging, and/or beach renourishment. This study addresses the effects of turbidity and deposited sediment on the survival and growth of newly settled and 6-week-old Orbicella faveolata recruits and disentangles the effects of turbidity and deposited sediment. We conducted two experiments in which newly settled coral recruits were reared in one of ten different turbidity and deposited sediment treatments for five weeks (0 NTU/ 0 mg cm-2, 3.4 NTU/ 0 mg cm-2, 8.2 NTU/ 0 mg cm-2, 16 NTU/ 0

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16

Paavo, Brian Lee, and n/a. "Soft-sediment benthos of Aramoana and Blueskin Bay (Otago, New Zealand) and effects of dredge-spoil disposal." University of Otago. Department of Marine Science, 2007. http://adt.otago.ac.nz./public/adt-NZDU20070928.161657.

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Studies were conducted to broadly describe and understand the sediment benthos of a shallow-water coastal area (Aramoana Beach - Heyward Point - Blueskin Bay) near the entrance to Otago Harbour, a system largely representative for southeastern New Zealand. Benthic assemblages were examined in relation to gradients of wave exposure and disturbance, sediment type and bathymetry, and dredge-spoil disposal. Sediment and macrofaunal surveys in autumn and spring 2003 found little change in sediment texture gradients from historical studies and a lack of vertical stratification. Macrobenthic sample

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17

WeiKao and 高瑋. "Effect of Dredging on Reduction in River Flood Stages." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/45svhd.

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碩士<br>國立成功大學<br>水利及海洋工程學系<br>106<br>In Taiwan, hillslides are of the geological and topographical conditions that are unfavorable to slope stability, thus readily leading to soil-stone collapse due to earthquake and rainfall, further forming loose rock deposition area and colluvium. Heavy rain runoff will erode and transport the rock into the channel, affecting the balance of the sediment transport and channel stability. With a large amount of rock flowing into the upstream, the midstream and downstream will have river deposition issues due to insufficient sediment transport capacity. As a res

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18

Kang, Chiao-Yin, and 康喬茵. "Effect of reservoir dredging on the water qualities of Zengwen River." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/fj6k98.

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碩士<br>國立屏東科技大學<br>環境工程與科學系所<br>106<br>This study focuses on Zengwen Basin, and tries to analyze the water quality monitoring data of the Environmental Protection Administration Executive Yuan from 2011 to 2017. The study tries to figure out the trend of water quality changes in the dredging from the upstream reservoir in the Zengwen Basin. The study focuses on suspended solids and uses methods such as box-and-whisker plot analysis, WQI7 water quality index analysis, and qualification rate analysis. Analyzing the WQI7 index values of water quality monitoring stations from 2011 to 2017, the most

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19

Li, Chieh-Ting, and 李玠廷. "The Effect of Torrent Dredging on Bed Scouring and Deposition of Upstream Watershed." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/63243817315023490120.

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碩士<br>逢甲大學<br>水利工程與資源保育學系<br>102<br>The study was conducted for the evolution of river sediment erosion and deposition process studies, conducted by CCHE1D torrent Mei River the erosion simulation, the model verification and validation, and to consider the anti-dam sediment under the regulation of the amount of outflow, three scenarios were simulated scenarios, the ultimate goal of proposed dredging to what extent, with the project management, the relevance of sediment erosion control facilities between change and conservation, let river erosion, siltation restore balance. The results can

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20

Uchino, Kanako. "Long-term ecological impacts of dredging on coral reefs in Kaneohe Bay, Oahu." Thesis, 2004. http://hdl.handle.net/10125/11619.

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21

Weng, Tso-Hsin, and 翁作欣. "The Effect of Sediment Deposition Potential Due to Dredging-A Case Study of Laonong River Upstream." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/57835779888158125780.

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碩士<br>國立屏東科技大學<br>土木工程系所<br>97<br>In river management, to ensure the flood discharge capability or protect the bridge, the application of dredging at appropriate place may reduce sedimentation and increase flood protection potential with a short term effect. Thus, it is interesting to explore the sediment deposition potential and its effects due to dredging. By using NETSTARS to simulate sediment transport, this research aims to explore the deposition and the change of hydraulics after dredging. Also, the related issues regarding the change of hydraulic of channel and riverbed elevation by dre

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22

Perez, Diana H. "Effects of a 4-inch suction dredge on benthic macroinvertebrates in southwestern Oregon." Thesis, 1999. http://hdl.handle.net/1957/33160.

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Effects of 4-inch (10.16 cm) suction dredge mining on benthic macroinvertebrates in 3rd to 4th order streams were investigated in 1996 by evaluating four mining claim operations in Althouse Creek, Sucker Creek, and Taylor Creek in southwestern Oregon's Rogue River basin. The effects were site-specific. The study showed no significant (p>0.05) differences between treatment and control areas in density and species diversity of benthic macroinvertebrates. However, mean taxa richness significantly (p<0.05) increased thirty days following the end of the mining period. Collector-filterers were signi

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23

Decker, Christopher Dylan. "The effects of sand dredging on the aquatic macroinvertebrate community in two urban piedmont streams." 2002. http://purl.galileo.usg.edu/uga%5Fetd/decker%5Fchris%5Fd%5F200212%5Fms.

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