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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24 Jun 1993
TL;DR: The morphological development of the Venice Lagoon has been discussed in this article, where the authors present models to simulate large scale development of a lagoon and of various sub-basins, mainly in a continuous erosion of the saltmarshes and shallow areas.
Abstract: The paper discusses the morphological development of the Venice Lagoon since 1850 and, on the basis of analyses of the system, presents models to simulate large scale development of the lagoon and of various sub-basins. The morphological development consists mainly in a continuous erosion of the saltmarshes and shallow areas, and a filling of canals. Also a general loss of sediment from the lagoon was observed. The main causes were identified in engineering structures like jetties, dredging of artificial canals and maintenance dredging. These works resulted in a disequilibrium of the natural hydraulic system. In addition, loss of biological protection in shallow areas, due to pollution, has contributed. Models were prepared on basis of time and partially averaged concentrations of sediment in shallow areas and canals. Averaging was carried on over a full year. This approach facilitated the building of models of various complexity, which were found to be useful tools in the analysis of the effectiveness of remedial measures .
7 citations
01 Jul 2020
TL;DR: In this paper, the authors conducted sediment erosion experiments on sand-mud mixtures with varying mud content to define the relationships between mud content, critical stress for erosion (τc), and erosion rate.
Abstract: Differences in erosion behavior of non-cohesive and cohesive sediments are widely recognized. In many natural environments, sand and mud are not completely separated and occur as mixtures. Significantly less research has been conducted on the erosion behavior of sand-mud mixtures compared to the separate treatment of sand and mud erosion. Sedflume erosion experiments were conducted on sand-mud mixtures with varying mud content to define the relationships between mud content, critical stress for erosion (τc), and erosion rate. Sand-mud mixtures were prepared with three mud sources: (1) non-swelling clay (kaolinite), (2) swelling clay (kaolinite/bentonite), and (3) a swelling, natural mud from the Mississippi River. Test results showed that critical shear stresses of the mixed sediments departed from that of pure sand with mud fractions on the order of 2% to 10%. Peak τc was observed between 30% to 40% mud content, with swelling muds achieving a ten-fold increase in τc while a five-fold increase in τc was measured for kaolinite. Additionally, this study demonstrated that the introduction of small amounts (≤5%) of mud to sand reduced erosion rates by a factor of 10 to 100. This observed abatement of erosion rate has implications for the use of dredged materials in civil and environmental engineering projects. DISCLAIMER: The contents of this report are not to be used for advertising, publication, or promotional purposes. Citation of trade names does not constitute an official endorsement or approval of the use of such commercial products. All product names and trademarks cited are the property of their respective owners. The findings of this report are not to be construed as an official Department of the Army position unless so designated by other authorized documents. DESTROY THIS REPORT WHEN NO LONGER NEEDED. DO NOT RETURN IT TO THE ORIGINATOR. ERDC/CHL TR-20-13 iii
7 citations
TL;DR: In this paper, modified elutriate tests were performed on two composite sediment samples and the results were used in the water quality computer models EFQUAL and PLUMES to aid in remedial design activities, which indicated dredging and nearshore confined disposal of Sitcum Waterway sediments can be accomplished without significant water quality impact.
7 citations
01 Jan 2010
TL;DR: In this paper, the German Baltic Sea coast between Warnemunde and Darss is investigated to investigate if sand extraction in this area has any effect on the coastline, bathymetric data from two particular time periods were compared, as well as the location of the coastline over five different years.
Abstract: The German Baltic Sea coast between Warnemunde and Darss is rapidly eroding. In this area, extensive sand extraction takes place at water depths of 8-13 m, for both local beach nourishment and industrial use. Sand resources in the area are restricted to a layer of <2 m of Holocene sand, whilst contemporary input of sand is limited to erosion of the cliff sections. To investigate if sand extraction in this area has any effect on the coastline, bathymetric data from two particular time periods were compared, as well as the location of the coastline over 5 different years, ranging from 1953-2002. Waves and wave-induced sediment transport were simulated using the integrated coastal zone model, Sistema de Modelado Costero (SMC). Results indicate some primary areas of concern: small changes in bathymetry of approximately 10% are sufficient to cause significant modifications in sediment transport potential at the coast; and, thus, alternations in the patterns of erosion and accretion. Sediment transport by both wave action and currents, induced by the inflow of North Sea water, is in a NE direction towards Darss. Here, deposition takes place in a National Park, where dredging is prohibited. There is very little input of sediment in the system. Any sand that is removed by marine aggregate extraction, for industrial use, will have a negative effect on the total sediment budget at the
7 citations
01 May 1993
TL;DR: In this article, the authors propose a method to solve the problem of "uniformity" and "uncertainty" in the context of data mining, and propose a solution.
Abstract: vii
7 citations