A geometric method to study water and sediment exchange in tidal harbors

Vanlede, J.; Dujardin, A.

doi:10.1007/s10236-014-0767-9

Cited by 11 publications

(8 citation statements)

References 8 publications

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“…Sediment import through advection is apparent both in the ADCP backscatter dataset (Section 4.3.2) as in the ensembles based on the OBS dataset (Section 4.3.1). This hypothesis is consistent with the analysis of the sediment exchange mechanisms between the harbor of Zeebrugge and the North Sea presented by Vanlede and Dujardin (2014).…”

Section: Discussionsupporting

confidence: 92%

“…A freshwater front of 1-m height in a water column of 15 m has a propagation speed of 0.6 m/s (β 1 = 0), which would (assuming no net water exchange) induce a depth averaged return flow of only 0.05 m/s into the harbor. This is consistent with an analysis of the velocity field around the harbor entrance of Zeebrugge which shows that water exchange due to density currents is small compared with the total exchange flow (Vanlede and Dujardin 2014).…”

Section: Influence Of Freshwater Inflow On Sediment Importsupporting

confidence: 90%

“…These results are consistent with the analysis of the flow exchange mechanisms between a harbor basin and the open sea, applied to Zeebrugge by Vanlede and Dujardin (2014). They concluded that horizontal exchange is the most important component of the sediment import at the harbor mouth of Zeebrugge and that most of the sediment import occurs from 2 h before high water to high water.…”

Section: Intratidal Variation Of Spm Concentration At Fixed Stationssupporting

confidence: 86%

“…Mud is generally transported in suspension or, in some cases, as near-bed fluid mud (Winterwerp 2005;Kirby 2011). Flow exchange mechanisms at a harbor entrance are well known and include tides, horizontal entrainment, and density currents (Vanlede and Dujardin 2014).…”

Section: Introductionmentioning

confidence: 99%

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Mud dynamics in the Port of Zeebrugge

et al. 2019

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This paper presents the mud dynamics in the harbor basin of Zeebrugge in the Southern North Sea based on an analysis of field data. Mud is typically transported into and within the harbor basin through advection of suspended particulate matter (SPM). Three important timescales have been identified. On the intratidal timescale, sediment import occurs from 2 h before high water to high water. Flood currents in the North Sea (directed northeastward along the Belgian coast) drive the primary gyre in the harbor mouth which is advected into the basin during rising tide. This results in water inflow near the eastern breakwater and outflow near the western breakwater. Because of sediment settling in the harbor, this results in a net import of SPM. During spring tide, the SPM flux into the harbor basin is two to four times higher than during neap tide. However, the volume of sediment removed from the port by maintenance dredging is kept constant over the spring-neap cycle, causing the amount of mud in the harbor basin to grow around spring tide conditions. On the seasonal timescale, mud volume within the harbor basin is larger in winter and reaches a minimum at the beginning of autumn. Moreover, the measured densities within the deposited mud layers are lower in winter than in summer. The most shallow point of the 210-kHz reflector is also more shallow in winter. Finally, the profile of the interface of the mud layer in the sheltered Albert II dock is more horizontal in winter than in summer, suggesting seasonal variations in the strength of the mud layer. The question to what degree the seasonal variation of thickness and density of the fluid mud layer is related to differences in the suspended sediment input, to differences in the settling rates of suspended flocs, or to the mud consolidation rate remains open however. The data do not show a strong influence of meteorological conditions (waves, freshwater inflow) on siltation rates in the harbor basin.

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Section: Discussionsupporting

confidence: 92%

Section: Influence Of Freshwater Inflow On Sediment Importsupporting

confidence: 90%

Section: Intratidal Variation Of Spm Concentration At Fixed Stationssupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

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Mud dynamics in the Port of Zeebrugge

et al. 2019

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“…The SSC revealed that the estuaries turbidity maximum was intensified due to the deep water project, especially in the wet season, and an upstream shift and extension of the ETM zone occurred. Vanlede and Dujardin (2014) apply geometric analysis method to study the exchange flow and sediment between a harbor and the surrounding water. The method can provide some insight into the complex relationship between hydrodynamics and sediment concentration that determines harbor siltation.…”

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confidence: 99%

The 2011 International Conference on Cohesive Sediment Transport (INTERCOH 2011)

Winterwerp

Manning

2015

Ocean Dynamics

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Geophysical surveys and satellite imaging for the evaluation of near‐surface terrain dynamic – A case study on Grand Portage, MN, USA

Jeong-Ki

Fratta

2023

Near Surface Geophysics

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Flooding, erosion, and increases in the water level in Lake Superior have contributed to changes in the stem location and width of the Grand Portage Creek. Those events threaten parts of the Grand Portage National Monument, a historically significant site on the North Shore of Lake Superior, Minnesota. We performed geophysical surveys to investigate these dynamic effects. We studied the near‐surface geological deposits, the mechanisms associated with creek stem dynamics, and sediment transport and deposition along the lakeshore in Grand Portage Bay. We deployed Ground Penetrating Radar (GPR), Sub Bottom Profiler (SBP), Side Scan Sonar (SSS), Geoprobe coring, and Van Veen Grab samplers and evaluated time‐lapse satellite images to assess the interaction of the Grand Portage Creek with the Grand Portage Bay. The onshore GPR surveys next to the national monument, the creek, and the shoreline showed the presence of a complex deposition with eroded ground surfaces and sediment layers across the creek valley. Results from the offshore geophysical campaigns and the interpretations of satellite images also document a heterogeneous deposition sequence environment with fine‐grained sediment deposits present south and southwest of the creek mouth. In addition, we documented an exposed boulder bed toward the east of the creek mouth that was exposed by the current and wave‐driven erosion process in the Grand Portage Bay. Time‐lapse satellite images and hydraulic current velocity simulations validate these observations and provide insight into how anthropogenic activities and natural events interact and might contribute to the long‐term stability of a site of historical and cultural importance.This article is protected by copyright. All rights reserved

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A geometric method to study water and sediment exchange in tidal harbors

Cited by 11 publications

References 8 publications

Mud dynamics in the Port of Zeebrugge

Mud dynamics in the Port of Zeebrugge

The 2011 International Conference on Cohesive Sediment Transport (INTERCOH 2011)

Geophysical surveys and satellite imaging for the evaluation of near‐surface terrain dynamic – A case study on Grand Portage, MN, USA

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