Characteristics of Suspended Sediment Generation and Dispersion during Dredging Operation around the EEZ Sand Mining Zone in South Sea of Korea

2021 ◽  
Vol 24 (4) ◽  
pp. 223-235
Author(s):  
Ki-Young Bang ◽  
Chang Woo Cho ◽  
Jeongmin Jeong ◽  
Kyuhee Son
Keyword(s):  
Suspended Sediment ◽  
Sand Mining ◽  
South Sea ◽  
Dredging Operation

The Effects of Marine Aggregate Extraction on the Macrobenthic Community at the EEZ Sand Mining Zone in South Sea of Korea

2021 ◽  
Vol 24 (4) ◽  
pp. 263-273
Author(s):  
Sungyong Choi ◽  
Hyunjung Lee ◽  
Soonwoo Lee ◽  
Soonyoung Wang ◽  
Jeongbin Lim ◽  
...  
Keyword(s):  
Macrobenthic Community ◽  
Sand Mining ◽  
South Sea ◽  
Marine Aggregate

scholarly journals Simulation of Sediment Discharges during an Outfall Dredging Operation

2016 ◽  
Vol 2016 ◽  
pp. 1-10
Author(s):  
Anton Purnama ◽  
Mahad S. Baawain ◽  
Dongdong Shao
Keyword(s):  
Suspended Sediment ◽  
Input Data ◽  
Single Port ◽  
Muddy Sediment ◽  
Fine Silt ◽  
Horizontal Angle ◽  
Marine Outfall ◽  
Near Shore ◽  
Water Depths ◽  
Dredging Operation

CORMIX-GTS simulations are carried out to study suspended muddy sediment plumes following the discharge of the spoils taken from the seabed during a marine outfall pipeline dredging operation. Single port discharges are considered at three different locations at 400 m, 800 m, and 1200 m from the shoreline with water depths ranging from 3.5 m to 10.5 m. For discharges in the shallow near-shore region at 400 m offshore, most of the dredge materials are deposited at the seabed and the simulated suspended sediment plumes are found to be carrying a concentration of less than 1 kg/m3 of mainly fine silt and clay. For discharges in the deeper far-shore region at 1200 m offshore, the sediment plumes are more elongated and carrying a concentration of more than 3 kg/m3. Iterative simulations are also conducted to analyse the inherent uncertainty in the input data by varying the ambient velocity and the port’s horizontal angle of discharge.

scholarly journals Dispersion Plumes in Open Ocean Disposal Sites of Dredged Sediment

Water ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 808
Author(s):  
Elisa Helena Fernandes ◽  
Pablo Dias da Silva ◽  
Glauber Acunha Gonçalves ◽  
Osmar Olinto Möller
Keyword(s):  
Suspended Sediment ◽  
Ecological Impact ◽  
Rio Grande ◽  
Open Ocean ◽  
Dredged Material ◽  
Dredged Sediment ◽  
Anthropogenic Pressures ◽  
Patos Lagoon ◽  
Dredging Operation ◽  
Ocean Disposal

Management of estuarine systems under anthropogenic pressures related to port settlement and development requires thorough understanding about the long-term sediment dynamics in the area. In an era of growing shipping traffic and of ever larger ships; millions of tons of bottom sediments are dredged annually all over the world and the major question concerning dredging operations is not whether they should be done, because it is obvious that they are extremely important and necessary, but where the dredged sediments can be disposed of with the least possible ecological impact. The present study involves the evaluation of transport trends of dredged material from a turbid estuary disposed of in four different open ocean disposal sites using numerical model techniques, aiming to contribute to minimizing potential environmental impacts and maximizing efficiency of the dredging operation. The study is carried out in southern Brazil, investigating the fate of dredged material from the Port of Rio Grande, located inside the Patos Lagoon estuary. Simulations were carried with the TELEMAC-3D model coupled with the suspended sediment (SEDI-3D) module and incorporating results from the wave module (TOMAWAC) to evaluate the dispersion of the suspended sediment plume and its interaction with coastal currents. This modeling structure proved to be a valuable tool to study the hydrodynamics and sediment transport pathways in estuarine and coastal areas. Results indicate that the natural Patos Lagoon coastal plume was observed under the predominant ebb flows and NE winds, promoting fine sediment entrapment south of the mouth of the lagoon (in front of Cassino Beach). The dispersion plumes in the disposal sites responded to the wind intensity and direction and did not present any transport tendency towards Cassino Beach. Part of the dredged sediment disposed of in the proposed alternative sites located in deeper areas (Sites B and C) left the site and was transported parallel to the coast (SW–NE direction) according to the wind direction (NE–SW). The area where the disposal sites were located took around 4 days to recover from the dredging operation and reach the usual suspended sediment concentrations and the actual Port of Rio Grande Licensed Site for dredged material proved to be the best alternative among the investigated options

Observed Suspended Sediment Profiles under the Effect of Single and Double Peaked Wave Spectra

2006 ◽  
Author(s):  
M. R. Delgado Blanco ◽  
M. Olabarrieta Lizaso ◽  
A. Giardino ◽  
R. Banasiak ◽  
R. Verhoeven ◽  
...  
Keyword(s):  
Suspended Sediment ◽  
Wave Spectra ◽  
Sediment Profiles

THE INITIAL RESULTS OF THE SUSPENDED SEDIMENT DYNAMICS DURING THE DRY SEASON IN THE HAU RIVER MOUTH AREA

2017 ◽  
Vol 17 (2) ◽  
Author(s):  
Nguyen Ngoc Tien ◽  
Dinh Van Uu ◽  
Nguyen Tho Sao ◽  
Do Huy Cuong ◽  
Nguyen Trung Thanh ◽  
...  
Keyword(s):  
Suspended Sediment ◽  
River Mouth ◽  
Dry Season ◽  
Sediment Dynamics ◽  
Mouth Area ◽  
River Mouth Area ◽  
Initial Results
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