Process-based modelling of a shoreface nourishment

Grunnet, Nicholas; Walstra, D.J.R.; Ruessink, Gerben

doi:10.1016/j.coastaleng.2004.07.016

Cited by 89 publications

(74 citation statements)

References 21 publications

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“…The model used in this study is based on a Delft3D hydrodynamic and sediment transport model originally developed specifically for the mouth of the Columbia River and which has been validated for waves and currents against field data (Elias et al, 2012). World-wide case studies indicate that Delft3D is applicable to a wide range of coastal and fluvial environments including ocean, estuary and river settings (Grunnet et al, 2004;Van Maren, 2004;Elias et al, 2006;Lesser et al, 2004;Mulligan et al, 2010). The base model for the CRE has a grid resolution varying between 50 to 100 m 2 , with an average of 20 grid cells covering the main channel of the river.…”

Section: Delft3d Sediment Transport Modelingmentioning

confidence: 99%

A survey of benthic sediment contaminants in reaches of the Columbia River Estuary based on channel sedimentation characteristics

Counihan

Waite

Nilsen

et al. 2014

Science of The Total Environment

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• We modeled sedimentation patterns in three reaches in the Columbia River Estuary.• Sediment transport model is used to guide bottom sediment sample allocation.• Organic carbon levels are correlated with predicted sedimentation patterns.• Sediment contaminants are correlated with predicted sedimentation patterns.• Longitudinal contaminant trends comport to trends in resident bird and fish tissues. While previous studies have documented contaminants in fish, sediments, water, and wildlife, few specifics are known about the spatial distribution of contaminants in the Columbia River Estuary (CRE). Our study goal was to characterize sediment contaminant detections and concentrations in reaches of the CRE that were concurrently being sampled to assess contaminants in water, invertebrates, fish, and osprey (Pandion haliaetus) eggs. Our objectives were to develop a survey design based on sedimentation characteristics and then assess whether sediment grain size, total organic carbon (TOC), and contaminant concentrations and detections varied between areas with different sedimentation characteristics. We used a sediment transport model to predict sedimentation characteristics of three 16 km river reaches in the CRE. We then compartmentalized the modeled change in bed mass after a two week simulation to define sampling strata with depositional, stable, or erosional conditions. We collected and analyzed bottom sediments to assess whether substrate composition, organic matter composition, and contaminant concentrations and detections varied among strata within and between the reaches. We observed differences in grain size fractions between strata within and between reaches. We found that the fine sediment fraction was positively correlated with TOC. Contaminant concentrations were statistically different between depositional vs. erosional strata for the industrial compounds, personal care products and polycyclic aromatic hydrocarbons class (Indus-PCP-PAH). We also observed significant differences between strata in the number of detections of Indus-PCP-PAH (depositional vs. erosional; stable vs. erosional) and for the flame retardants, polychlorinated biphenyls, and pesticides class (depositional vs. erosional, depositional vs. stable). When we estimated mean contaminant concentrations by reach, we observed higher contaminant concentrations in the furthest downstream reach with a decreasing trend in the two upstream reaches. Contaminant survey designs that account for sedimentation characteristics could increase the probability that sampling is allocated to areas likely to be contaminated. a b s t r a c t a r t i c l e i n f oPublished by Elsevier B.V.

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Section: Delft3d Sediment Transport Modelingmentioning

confidence: 99%

A survey of benthic sediment contaminants in reaches of the Columbia River Estuary based on channel sedimentation characteristics

Counihan

Waite

Nilsen

et al. 2014

Science of The Total Environment

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“…Delft3D is a robust process-based numerical model suite which can be applied in different coastal environments, including complex geomorphological features as spits (Dan et al, 2011;Grunnet et al, 2004). It is composed of different modules that can compute the hydrodynamics, waves, sediment transport, morphology, water quality and ecology.…”

Section: Model Overviewmentioning

confidence: 99%

Effect of Different Forcing Processes on the Longshore Sediment Transport at the Sand Motor, the Netherlands

Kaji¹,

Luijendijk

Vries

et al. 2014

Int. Conf. Coastal. Eng.

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The Sand Motor is a pilot project of a 'mega-nourishment' built in the Dutch coast in 2011. In order to understand which conditions reshape those mega-nourishments the influence of different types of forcing on the longshore sediment transport along the Sand Motor has been assessed in this paper using a process-based model. The use of numerical simulations enables the independent assessment of the different processes influencing the sediment transport magnitudes and direction. A calibrated depth-averaged model of the Sand Motor was used in order to compute the sediment transport rates around the nourishment. Results show that the overall evolution of the Sand Motor is event-driven, as the combination of energetic wave conditions, strong winds and high storm surge levels can lead to high sediment transport rates and therefore intense erosion.

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“…Cialone and Kraus (2001), Cialone et al (2003), and Cialone (2003) present applications of the IMS at structured inlets. Grunnet et al (2004) discuss these issues and describe a systematic approach to be used in the validation of the 2D and three-dimensional (3D) numerical models for shoreface nourishment. They also critique the lack of proper data used in some previous studies conducted for measuring nearshore data aimed at validation of nearshore zone hydrodynamic evolution in time and space.…”

Section: Introductionmentioning

confidence: 99%