Topic
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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27 Jul 2016
TL;DR: In this paper, the authors investigate the impact of dredging and reclamation projects as one of the geotechnical engineering elements and show that the impact can be reduced with a proper monitoring and management by the project stakeholders.
Abstract: Dredging works are commonly described as removal of sediments from underwater which involving excavation process. Soil and rocks are excavated for channel and harbor deepening and for land reclamation. Land reclamation is defined as usage of dredged sediments to construct or build new land in the sea. This research aims to investigate the impact of dredging and reclamation projects as dredging and reclamation are one of the geotechnical engineering elements. Human activities such as dredging and reclamation may lead to geo-hazards such as coastal erosion, landslides, flooding and etc. In this research, 157 villagers from Teluk Rampang and Langkah Baik, Pengerang, Kota Tinggi in Malaysia has been selected as respondents to answer the distributed questionnaire. As a result, the analysis shows that villagers become victims due to the reclamation project executed to construct petroleum hub in Pengerang, Kota Tinggi. The impact can be reduced with a proper monitoring and management by the project stakeholders’.
9 citations
TL;DR: In this article, the authors conducted an inventory of nearshore sand resources on the Louisiana continental shelf Exploration for offshore sand deposits is conducted in two phases, with high-resolution seismic reflection profiling to locate potential sand bodies followed by vibracoring to confirm seismic intepretations and obtain samples for textural characterization.
9 citations
01 Oct 1983
TL;DR: In this paper, the authors assess the potential for placing a cap at the experimental Mud Dump site and to determine reductions in environmental impacts related to capping and determine if the capping effort yielded an intact cap showing resistance to erosion, and if the effort reduced loss of organic and inorganic toxicants from the contaminated material to the water column.
Abstract: : The objective of the project was to assess the potential for placing a cap at the experimental Mud Dump site and to determine reductions in environmental impacts related to capping. Contaminated sediment from dredging projects in the Hudson Estuary, Newark Bay, and contiguous waters were capped first with fine sediments from the Bronx River and Westchester Creek, then with sand from the Ambrose Channel. The capping resulted in a layer of sand about 1m thick lying atop the contaminated sediment. Physical, chemical and biological studies were carried out to determine if the capping effort yielded an intact cap showing resistance to erosion, and if the effort reduced loss of organic and inorganic toxicants from the contaminated material to the water column. It was determined that a cap was successfully placed at the experimental dump site. The cap was still intact and in place after 16 months. Cap erosion was minor; predictions of cap life were in excess of 20 years under normal meteorological conditions. Major storm events, however, are capable of eroding the cap and exposing the contaminated material. During the 16 months of study, the contaminated material decreased in volume by about 4%. Part of the decrease was due to compaction and part was due to loss of solids during dumping and deposition.
9 citations
TL;DR: The severity of released ash effects appears to be limited to the initial smothering of the organisms followed by a rapid response and the initial start of recovery postdredging.
Abstract: Benthic invertebrate communities were assessed after the December 2008 release of approximately 4.1 million m3 coal fly ash from a disposal dredge cell at the Tennessee Valley Authority (TVA) Kingston Fossil Plant on Watts Bar Reservoir in Roane County, Tennessee, USA. Released ash filled the adjacent embayments and the main channel of the Emory River, migrating into reaches of the Emory, Clinch, and Tennessee Rivers. Dredging was completed in summer 2010, and the benthic community sampling was conducted in December 2010. This study is part of a series that supported an Ecological Risk Assessment for the Kingston site. Benthic invertebrate communities were sampled at transects spread across approximately 20 miles of river that includes both riverine and reservoirlike conditions. Community composition was assessed on a grab sample and transect basis across multiple cross-channel transects to gain an understanding of the response of the benthic community to a fly ash release of this magnitude. This assessment used invertebrate community metrics, similarity analysis, geospatial statistics, and correlations with sediment chemistry and habitat. The community composition was reflective of a reservoir system, with dominant taxa being insect larva, bivalves, and aquatic worms. Most community metric results were similar for ash-impacted areas and upstream reference areas. Variation in the benthic community was correlated more with habitat than with sediment chemistry or residual ash. Other studies have reported that a benthic community can take several years to a decade to recover from ash or ash-related constituents. Although released ash undoubtedly had some initial impacts on the benthic community in this study, the severity of these effects appears to be limited to the initial smothering of the organisms followed by a rapid response and the initial start of recovery postdredging. Integr Environ Assess Manag 2015;11:43–55. © 2014 SETAC
9 citations