Land–sea interaction and morphogenesis of coastal foredunes — A modeling case study from the southern Baltic Sea coast

Zhang, Wenyan; Schneider, R.; Kolb, Jakob J.; Teichmann, Tim; Dudzińska-Nowak, Joanna; Harff, Jan; Hanebuth, Till J J

doi:10.1016/j.coastaleng.2015.03.005

Cited by 32 publications

(26 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To better assess its potential impact on carbon budget, a numerical experiment was carried out. In this experiment, we applied a sand dune model (Zhang et al, ) to a small domain (1 × 1 km) with a grid resolution of 0.5 × 0.5 m. The model domain is assumed to be initially covered by an erodible layer (1 m thick) of sands with uniform grain size (250 μm) to mimic the sandy seafloor environment in the southern North Sea (Figure b). A constant, unidirectional current of 25 cm/s (bottom shear stress = 0.16 N/m 2 ) was specified as driving force.…”

Section: Discussionmentioning

confidence: 99%

The Budget of Macrobenthic Reworked Organic Carbon: A Modeling Case Study of the North Sea

Zhang

Wirtz²,

Daewel³

et al. 2019

JGR Biogeosciences

Self Cite

View full text Add to dashboard Cite

The importance of macrobenthos in benthic‐pelagic coupling and early diagenesis of organic carbon has long been recognized but has not been quantified at a regional scale. By using the southern North Sea as an exemplary area we present a modeling attempt to quantify the budget of total organic carbon (TOC) reworked by macrobenthos in seafloor surface sediments. Vertical profiles in sediments collected in the field indicate a significant but nonlinear correlation between TOC and macrobenthic biomass. A mechanistic model is used to resolve the bidirectional interaction between TOC and macrobenthos. A novelty of this model is that bioturbation is resolved dynamically depending on variations in local food resource and macrobenthic biomass. The model is coupled to 3‐D hydrodynamic‐biogeochemical simulations to hindcast the mutual dependence between sedimentary TOC and macrobenthos from 1948 to 2015. Agreement with field data reveals a satisfactory model performance. Our simulations show that the preservation of TOC in the North Sea sediments is determined not only by pelagic conditions (hydrodynamic regime and primary production) but also by the vertical distribution of TOC, bioturbation intensity, and the vertical positioning of macrobenthos. Macrobenthos annually ingest 20–35% and in addition vertically diffuse 11–22% of the total budget of TOC in the uppermost 30‐cm sediments in the southern North Sea. This result indicates a central role of benthic animals in modulating the organic carbon cycling at the sediment‐water interface of continental margins.

show abstract

Section: Discussionmentioning

confidence: 99%

The Budget of Macrobenthic Reworked Organic Carbon: A Modeling Case Study of the North Sea

Zhang

Wirtz²,

Daewel³

et al. 2019

JGR Biogeosciences

Self Cite

View full text Add to dashboard Cite

show abstract

“…It couples some widely used models in a parallel computational structure to solve different processes. Through a module coupling interface, the model allows an integration of external functional modules to take into account‐specific processes of interest [ Zhang et al ., ]. Major functional components of the model include: A three‐dimensional circulation‐wave coupled module based on the Princeton Ocean Model [ Blumberg and Mellor , ; Mellor et al ., ] adopting a fourth‐order vertical pressure gradient scheme from McCalpin []; A bottom boundary layer (BBL) module based on the Styles‐Glenn model [ Styles and Glenn , ] taking into account the impact of stratification induced by suspended particulate matter (SPM)—on the vertical structure of current velocity in the constant stress layer; A subaqueous sediment transport module [ Zhang et al ., ] modified from ECOMSED [ HydroQual, Inc ., ] for a process‐based formulation of erosion, suspended load/bed load transport, and deposition of cohesive (one grain‐size class) and noncohesive (multiple grain‐size classes) sediment; and A bathymetry update module based on the technique of morphological update acceleration and approaches for maintaining the computational stability [ Zhang et al ., ]. …”

Section: Data Sets and Methodsmentioning

confidence: 99%

Storm‐driven bottom sediment transport on a high‐energy narrow shelf (NW Iberia) and development of mud depocenters

et al. 2016

Self Cite

View full text Add to dashboard Cite

Bottom sediment transport on the NW Iberian shelf was monitored during a downwelling storm in September 2014. Collected data were analyzed and fed into a 3-D coastal ocean model to understand storm-driven sediment transport on the shelf and its impact on midshelf mud depocenters (MDCs). A significantly enhanced level of bottom sediment resuspension, nearly two orders of magnitude higher than that in the prestorm period, was recorded at the mooring site. Field data analysis reveals that it was induced by a short-lasting strong bottom current in combination with enhanced wave-current interaction. Simulation results indicate that this strong current was part of a coastal jet resulted from downwelling. An across-shelf horizontal density gradient as high as 0.32 g/m 4 occurred at the interface between the downwelling and the bottom waters, forming a remarkable front. Due to buoyancy effect, the downwelling water was mostly confined to the coast with a depth limit of 80 m in the south and 120 m in the north of the region, resulting in a northward-directed coastal jet. Simulation results suggest that during the storm, local near-bottom sediment suspensions with concentrations on the order of 10 kg/m 3 would be triggered by wave-current interaction and flow convergence associated with the front. Direct impact on the development of MDCs by transport and deposition of concentrated sediment suspensions is indicated by model results. The seaward limit of the front coincided with the shoreward edge of the MDC nucleus, suggesting the front as a primary control on the deposition of fine-grained sediment.

show abstract

“…The modeling approach reviewed here considers the effect of increasing moisture content on lengthening the critical fetch (F c ) necessary to achieve saturated transport, however, it is also possible to model this effect as a limitation on sand supply from the surface directly (cf., de Vries et al, 2014). Other studies have attempted to scale up sediment supply to coastal dunes and model their evolution by simply calculating subaerial barrier volumes and comparing these to foredune volumetric change measurements (e.g., Miot da Silva and Hesp, 2010), or by using computational approaches that solve simplified aerodynamics and sand transport relations (e.g., Luna et al, 2011;Duran and Moore, 2014) or cellular automata approaches (e.g., Baas, 2002;Baas and Neild, 2007;Zhang et al, 2015;Keijsers et al, 2016). The utility of these modelling efforts is limited, however, by fundamental…”

Section: Advances In Modelling the Effect Of Supply-limited Conditionmentioning

confidence: 99%

“…While incorporation of complexities such as moisture and vegetation may improve some simulations (e.g., Luna et al, 2011, Zhang et al, 2015Keijsers et al, 2016), realistic parameterization of vegetation growth (e.g., seasonal phenology, gradual succession) and related roughness effects and sand trapping efficiency are generally lacking. In addition, there are limited field measurements to inform and validate such models, which increases the risk of using expedient oversimplifications (Barchyn et al, 2014).…”

Section: Advances In Modelling the Effect Of Supply-limited Conditionmentioning

confidence: 99%

“…None of these models adequately couple nearshore processes to aeolian processes in the true sense of beach-dune interaction. Very recently, Zhang et al (2015) coupled a process-based nearshore model and a cellular automata aeolian model to simulate historical foredune change on the Baltic Coast. Due to the extent and limitations of model calibration, however, accurate prediction of future coastline change at scales of years to decades remains elusive.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

See 1 more Smart Citation

Scale-dependent perspectives on the geomorphology and evolution of beach-dune systems

Walker

Davidson‐Arnott

Bauer

et al. 2017

Earth-Science Reviews

108

View full text Add to dashboard Cite

show abstract

Land–sea interaction and morphogenesis of coastal foredunes — A modeling case study from the southern Baltic Sea coast

Cited by 32 publications

References 44 publications

The Budget of Macrobenthic Reworked Organic Carbon: A Modeling Case Study of the North Sea

The Budget of Macrobenthic Reworked Organic Carbon: A Modeling Case Study of the North Sea

Storm‐driven bottom sediment transport on a high‐energy narrow shelf (NW Iberia) and development of mud depocenters

Scale-dependent perspectives on the geomorphology and evolution of beach-dune systems

Contact Info

Product

Resources

About