106. An Ergonomic Assessment of a Dredging Operation

1999 ◽  
Author(s):  
C. Wen
Keyword(s):  
Dredging Operation

Physicochemical and ecotoxicological evaluation of estuarine water quality during a dredging operation

2009 ◽  
Vol 10 (1) ◽  
pp. 65-76 ◽  
Author(s):  
Sandro R. Urban ◽  
Albertina X. R. Corrêa ◽  
Carlos A. F. Schettini ◽  
Paulo R. Schwingel ◽  
Rafael M. Sperb ◽  
...  
Keyword(s):  
Water Quality ◽  
Estuarine Water ◽  
Ecotoxicological Evaluation ◽  
Estuarine Water Quality ◽  
Dredging Operation

scholarly journals EFFECT OF DREDGING ON HG DISTRIBUTION IN WATER AND SEDIMENTS IN THE MUCURIPE HARBOR, FORTALEZA, NE BRAZIL

2020 ◽  
Vol 52 (2) ◽  
pp. 77-84
Author(s):  
Luiz Drude De Lacerda ◽  
Ingra Kellen Belmino Belmino ◽  
Lucas Buruaem Moreira ◽  
Rozane Valente Marins
Keyword(s):  
Bottom Sediments ◽  
Suspended Solids ◽  
Progressive Increase ◽  
Coastal Sediments ◽  
Aquatic Biota ◽  
Tailings Disposal ◽  
Regional Background ◽  
Shelf Sediments ◽  
The Impact ◽  
Dredging Operation

Dredging and tailings disposal can mobilize mercury (Hg) accumulated in bottom sediments, increasing the exposure of the aquatic biota. In the Mucuripe Harbor, NE, Brazil, dredging is performed regularly, but the impact on Hg mobilization is unknown. This paper presents results from the monitoring of a dredging operation to characterize and quantify an eventual Hg mobilization. The results showed that remobilization is significant and is associated with suspended solids. Further deposition of the Hg-enriched, remobilized, suspended solids increased Hg concentrations by a factor of 1.2 and 2.0 in harbor and shelf sediments, respectively. Maximum concentrations in harbor and shelf sediments reached 79.9 ng.g-1 and 32.4 ng.g-1 (20 and 9 higher than the regional background, respectively). The progressive increase in Hg concentrations may result in higher exposure to the local biota.Keywords: metals, mobilization, contamination, coastal sediments.

Localised and limited impact of a dredging operation on coral cover in the northwestern lagoon of New Caledonia

2016 ◽  
Vol 105 (1) ◽  
pp. 208-214 ◽  
Author(s):  
Mehdi Adjeroud ◽  
Antoine Gilbert ◽  
Mathilde Facon ◽  
Marion Foglia ◽  
Benjamin Moreton ◽  
...  
Keyword(s):  
New Caledonia ◽  
Coral Cover ◽  
Limited Impact ◽  
Dredging Operation

Automatic Dredging Robot for Metallurgical Drainage Trench Based on Virtual Design Technology

2012 ◽  
Vol 490-495 ◽  
pp. 2115-2119
Author(s):  
Feng Wang
Keyword(s):  
Operating Mode ◽  
Working Environment ◽  
Virtual Design ◽  
Iron And Steel ◽  
Closed Type ◽  
Walking Mechanism ◽  
The Stability ◽  
3D Solid ◽  
3D Solid Modeling ◽  
Dredging Operation

The artificial dredging method is now used for the closed-type drainage trench of Tangshan Iron and Steel Co. Ltd., with low operation efficiency and large labor intensity. A new kind of dredging robot was presented in order to completely replace the human to clean the trench automatically. It is mainly composed of the crawler type walking mechanism, dredging chain bucket, silt conveying belt, and silt conveying carriage. Due to the adoption of the operating mode of mechanized dredging and mechanized conveying, the robot can enable the workers to get rid of the bad working environment thoroughly and overcome the various problems resulting from the artificial method. The 3D solid modeling and virtual assembly were conducted and the stability was analyzed by the use of Pro/E. It has been proved that under the condition of full load, the robot can implement the dredging operation stably and efficiently, which means that the design of the robot is feasible and effective.

scholarly journals Analysis of Late Pleistocene megafauna and puparia from the Lent dredging site, province of Gelderland (the Netherlands)

2021 ◽  
Vol 100 ◽  
Author(s):  
David S. Douw ◽  
Belle E.I. van Rijssen ◽  
René H.B. Fraaije ◽  
Jonathan J.W. Wallaard
Keyword(s):  
The Netherlands ◽  
Late Pleistocene ◽  
Prolonged Exposure ◽  
Artificial Lakes ◽  
Considerable Impact ◽  
Late Pleistocene To Holocene ◽  
Dredging Operation ◽  
Woolly Mammoth

Abstract More than 900 vertebrate bones, ranging from Late Pleistocene to Holocene in age, have been identified in a collection that was recovered by a single dredging operation for the construction of artificial lakes near Lent (Nijmegen, province of Gelderland, the Netherlands). The Late Pleistocene assemblage comprises mainly Weichselian glacial fauna such as mammoths, reindeer and bison. Some Eemian fauna is represented as well, e.g. straight-tusked elephant. The abundance of certain species over others suggests that preservation bias had a considerable impact on this assemblage, while its time-averaged nature resulted in overrepresentation of certain species. A case study is here conducted on a fragmentary skull of a subadult woolly mammoth bull with embedded blowfly puparia. Some of these puparia are fully developed, indicating prolonged exposure of the mammoth carcass.

scholarly journals A 3-D model to analyze environmental effects of dredging operations – application to the Port of Marin, Spain

2014 ◽  
Vol 39 ◽  
pp. 95-99 ◽  
Author(s):  
J. García Alba ◽  
A. G. Gómez ◽  
R. O. Tinoco López ◽  
M. L. Sámano Celorio ◽  
A. García Gómez ◽  
...  
Keyword(s):  
Experimental Data ◽  
Environmental Effects ◽  
Laboratory Tests ◽  
Toxic Substances ◽  
Seabed Sediment ◽  
Physical Laboratory ◽  
D Model ◽  
Dredging Operation

Abstract. Historically, the study of dredging processes has depended on physical laboratory tests. The IH-Dredge model has been developed to simulate these processes numerically. It simulates the evolution of the seabed, sediment and toxic substances involved in dredging operations. The model has been calibrated and validated with experimental data, and it has been applied in a dredging operation in the Port of Marin, Spain.

scholarly journals Project Evaluation Review Technique Model to Dredging Operations in Niger Delta

2019 ◽  
Vol 4 (3) ◽  
pp. 190-195
Author(s):  
Barinyima Nkoi ◽  
Animia Ajor Wordu ◽  
Fortune Worgu
Keyword(s):  
Niger Delta ◽  
Random Variable ◽  
Project Evaluation ◽  
Time Estimate ◽  
Parametric Control ◽  
Port Harcourt ◽  
Project Network ◽  
Time Variables ◽  
Rivers State ◽  
Dredging Operation

This research applies Project Evaluation and Review Technique (PERT) model to estimate acceptable duration for execution of each activity having random variable of time and some probability distribution for sand dredging operation in Niger Delta. The study takes into account proper planning, scheduling, controlling and allotment of dredging activities time using a project network model PERT. The model evaluated how acceptable time and saving cost could be achieved in a scenario of activities having random time variables. Readily available data of activities time from 2014 – 2017 were used to analyze the time estimate for various activities at a selected dredge site Aleto-Eleme in Port Harcourt metropolis Rivers State-Nigeria. The PERT was applied for the data analysis, to construct the PERT scheme for the dredging operations. Finally, parametric control for project evaluation and review techniques of acceptable time for the dredging activities were determined.

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