Modelling studies on the processes that influence matter transfer on the Gulf of Thermaikos (NW Aegean Sea)

Kourafalou, Vassiliki H.; Savvidis, Yiannis; Krestenitis, Yannis Ν.; Koutitas, Christophoros G.

doi:10.1016/j.csr.2003.10.009

Cited by 36 publications

(33 citation statements)

References 42 publications

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“…Our results suggest that realistic simulations in the North Aegean have to include high frequency buoyancy forcing at the Dardanelles, a very difficult task given the lack of related data. An intermediate step would be to use the discharge rates and vertical structure of the outflow proposed by Besiktepe et al (1993), as in the numerical simulations of the Aegean by Krestenitis and Valioulis (1997).…”

Section: Discussion and Concluding Remarksmentioning

confidence: 99%

“…For the rivers, the properties of the run-off were salinity set to zero and a temperature the same as that of the ambient waters. The run-off rates are shown in Table 1 and they are based on climatological annual means (Therianos, 1974); for the Axios, Aliakmonas and Pinios Rivers the values are modified according to measurements obtained during the METRO-MED Project (Dynamics of Matter Transfer and Biogeochemical Cycles: their modeling in Coastal Systems of the Mediterranean Sea), as shown in Kourafalou et al (2003). For the Dardanelles outflow, we used monthly values of discharge with varying temperature and salinity ( Table 2).…”

Section: Initial Conditions and Forcing Fieldsmentioning

confidence: 99%

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High resolution simulations on the North Aegean Sea seasonal circulation

Kourafalou

Barbopoulos

2003

Ann. Geophys.

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Abstract. The seasonal characteristics of the circulation in the North Aegean Sea are examined with the aid of a climatological type simulation (three-year run with perpetual year forcing) on a fine resolution grid (2.5 km by 2.5 km). The model is based on the Princeton Ocean Model with a parameterisation of plume dynamics that is employed for the input of waters with hydrographic properties that are different than the properties of basin waters, as the Black Sea Water (BSW) outflow through the Dardanelles Strait and riverine sources. The model is nested with a sequence of coarser regional and basin-wide models that provide for the long-term interaction between the study area and the Eastern Mediterranean at large. The results are employed to discuss the response of the North Aegean to the important circulation forcing mechanisms in the region, namely wind stress, heat and salt fluxes, buoyancy due to rivers and the BSW outflow (which is low in salinity and occasionally low in temperature) and the interaction with the Southern Aegean. The high resolution allows for the detailed representation of the complicated topography that presides in the region. This helps produce a rich eddy field and it allows for variability in the pathways of BSW that has implications in the basin hydrography and circulation.

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Section: Discussion and Concluding Remarksmentioning

confidence: 99%

Section: Initial Conditions and Forcing Fieldsmentioning

confidence: 99%

High resolution simulations on the North Aegean Sea seasonal circulation

Kourafalou

Barbopoulos

2003

Ann. Geophys.

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“…Numerical sediment transport modeling provides the capability to examine idealized case studies and realistic scenarios to explore the contributions of various processes with detailed spatial and temporal resolution. Shelf sediment-transport models have been applied in two dimensions (cross shelf and depth) (Zhang et al, 1999;Cookman and Flemings, 2001;Wiberg, 2001, 2002;Davies and Xing, 2002), in three dimensions with idealized (Kampf and Fohrmann, 2000) and realistic environments (Holt and James, 1999;Signell and Harris, 2000;Luff and Moll, 2004), and with particle tracking algorithms (Kourafalou et al, 2004). Often the simulations are limited to a single sediment class, typically use only a single-layer bed, and lack adequate observational data for model verification.…”

Section: Introductionmentioning

confidence: 99%

Storm-driven sediment transport in Massachusetts Bay

Warner

Butman

Dalyander

2008

Continental Shelf Research

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Massachusetts Bay is a semi-enclosed embayment in the western Gulf of Maine about 50 km wide and 100 km long. Bottom sediment resuspension is controlled predominately by storm-induced surface waves and transport by the tidal-and wind-driven circulation. Because the Bay is open to the northeast, winds from the northeast ('Northeasters') generate the largest surface waves and are thus the most effective in resuspending sediments. The three-dimensional oceanographic circulation model Regional Ocean Modeling System (ROMS) is used to explore the resuspension, transport, and deposition of sediment caused by Northeasters. The model transports multiple sediment classes and tracks the evolution of a multilevel sediment bed. The surficial sediment characteristics of the bed are coupled to one of several bottom-boundary layer modules that calculate enhanced bottom roughness due to wave-current interaction. The wave field is calculated from the model Simulating WAves Nearshore (SWAN). Two idealized simulations were carried out to explore the effects of Northeasters on the transport and fate of sediments. In one simulation, an initially spatially uniform bed of mixed sediments exposed to a series of Northeasters evolved to a pattern similar to the existing surficial sediment distribution. A second set of simulations explored sediment-transport pathways caused by storms with winds from the northeast quadrant by simulating release of sediment at selected locations. Storms with winds from the north cause transport southward along the western shore of Massachusetts Bay, while storms with winds from the east and southeast drive northerly nearshore flow. The simulations show that Northeasters can effectively transport sediments from Boston Harbor and the area offshore of the harbor to the southeast into Cape Cod Bay and offshore into Stellwagen Basin. This transport pattern is consistent with Boston Harbor as the source of silver found in the surficial sediments of Cape Cod Bay and Stellwagen Basin. Published by Elsevier Ltd.

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“…Estournel, 2000), solving the well-known three-dimensional differential equations of transport and diffusion of matter concentration, particle tracking methods (e.g. Savvidis et al, 2001;Kourafalou et al, 2004), where advection and diffusion of a specific amount of mass is trailed with time, or combined EulerianLagrangian methods (e.g. Barros and Baptista, 1990), in which advection is expressed by particles whereas the dispersion is defined applying the finite differences scheme.…”

Section: Introductionmentioning

confidence: 99%

Modelling the cohesive sediment transport in the marine environment: the case of Thermaikos Gulf

2007

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Abstract. The transport of fine-grained sediments in the marine environment entails risks of pollutant intrusions from substances absorbed onto the cohesive flocks' surface, gradually released to the aquatic field. These substances include nutrients such as nitrate, phosphate and silicate compounds from drainage from fertilization of adjacent cultivated areas that enter the coastal areas through rivers and streams, or trace metals as remainders from urban and industrial activities. As a consequence, knowledge on the motion and distribution of sediment particles coming from a given pollutant source is expected to provide the 'bulk' information on pollutant distribution, necessary for determining the region of influence of the source and to estimate probable trophic levels of the seawater and potential environmental risks. In that aim a numerical model has been developed to predict the fate of the sediments introduced to the marine environment from different pollution sources, such as river outflows, erosion of the seabed, aeolian transported material and drainage systems.The proposed three-dimensional mathematical model is based on the particle tracking method, according to which matter concentration is expressed by particles, each representing a particular amount of sedimentary mass, passively advected and dispersed by the currents. The processes affecting characteristics and propagation of sedimentary material in the marine environment, incorporated in the parameterization, apart from advection and dispersion, include cohesive sediment and near-bed processes. The movement of the particles along with variations in sedimentary characteristics and state, carried by each particle as personal information, are traced with time. Specifically, concerning transport processes, the local seawater velocity and the particle's settling control advection, whereas the random Brownian motion due to turbulence simulates turbulent diffusion. TheCorrespondence to:

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Modelling studies on the processes that influence matter transfer on the Gulf of Thermaikos (NW Aegean Sea)

Cited by 36 publications

References 42 publications

High resolution simulations on the North Aegean Sea seasonal circulation

High resolution simulations on the North Aegean Sea seasonal circulation

Storm-driven sediment transport in Massachusetts Bay

Modelling the cohesive sediment transport in the marine environment: the case of Thermaikos Gulf

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