The Dutch Continental Shelf Model

Abstract

The topic of the paper is quantitative skill assessment in numerical flow modelling. Conceptual model definition, discretization aspects, quality assessment of the various types of model input data and model validation data, quantitative and objective norms and criteria for validation and assessment of results are discussed. Introductory sections discuss the definition of the concepts and terminology, and the characterization of the types of geophysical data that are used. This is followed by addressing the need for explicit model definition. In a further section we discuss the well-known method of the not formally structured process of calibration and validation by hand through visual inspection of the results, based on knowledge of the processes and insight. The strong potential of the newly available automatic parameter identification techniques to support insight and knowledge is discussed as well. The various aspects are illustrated on the step by step set up and validation of the Dutch Continental Shelf Model. This model is extensively used for simulation of tide and surge on the Northwest European Continental Shelf. The integration of a dedicated version as a module for six-hourly surge forecasting in the automatic production line of the Royal Netherlands Meteorological Institute (KNMI) is discussed next. It serves as a vehicle to illustrate the crucial aspects of elicitation, quantification and actual guaranteeing of skill and quality that is required when one applies a model as an fully operational decision support tool. In the success of such applications the model's extension with data-assimilation schemes and its interfacing with other models which provide input data play a key role. To preserve model integrity and model skill, the automatic input of time varying field data requires a rigorous automatic data-quality screening, however. The paper shows that the concepts and tools for quantitative skill assessment of coastal ocean modelsparticularly for water levels-exist; conscientious application will lead to a model whose skill can be assessed quite clearly in an explicit, objective and quantified manner. Quantitative Skill Assessment for Coastal Ocean ModelsCoastal and Estuarine Studies Volume 47, Pages 425-467

Riding the tide: intriguing observations of gulls resting at sea during breeding

“…The Zuno Model (Rijswijk, The Netherlands, Rijkswaterstaat) was used for assessing the tidal currents along the North Sea coast of The Netherlands. Currents were calculated with the Dutch Continental Shelf Model (Gerritsen et al. 1995) with a grid size resolution of 1/12°N and 1/8°E.…”

Riding the tide: intriguing observations of gulls resting at sea during breeding

“…The Zuno Model (Rijswijk, The Netherlands, Rijkswaterstaat) was used for assessing the tidal currents along the North Sea coast of The Netherlands. Currents were calculated with the Dutch Continental Shelf Model (Gerritsen et al. 1995) with a grid size resolution of 1/12°N and 1/8°E.…”

Modeling storm surge flooding of an urban area with particular reference to modeling uncertainties: A case study of Canvey Island, United Kingdom

“…A storm surge model of the North West European Continental Shelf, the southern North Sea, and the Thames Estuary was used to predict water levels at Canvey Island for different scenarios of meteorological and tidal forcing [ Brown , 2004]. The largest‐scale model was based on the Dutch Continental Shelf Model, which is used for operational forecasting of storm surges in the Netherlands [ Gerritsen et al , 1995]. Using a simple description of the geometry of a cyclone, together with observations of surface pressure from large historic storms, a parametric model was used to generate meteorological forcing for the flood model [see also Bijl , 1997].…”

A unified formulation for the three-dimensional shallow water equations using orthogonal co-ordinates: theory and application

“…Solving the transformed equations in spherical co-ordinates on a standard latitude-longitude spherical grid is common for large-scale tidal and surge modelling, see e.g. Schwiderski (1980), Flather (2000, Gerritsen et al (1995) and Williamson et al (1992). However, coastlines are again represented coarsely by staircase boundaries.…”

Riding the tide: intriguing observations of gulls resting at sea during breeding

“…The Zuno Model (Rijswijk, The Netherlands, Rijkswaterstaat) was used for assessing the tidal currents along the North Sea coast of The Netherlands. Currents were calculated with the Dutch Continental Shelf Model (Gerritsen et al. 1995) with a grid size resolution of 1/12°N and 1/8°E.…”

Modeling storm surge flooding of an urban area with particular reference to modeling uncertainties: A case study of Canvey Island, United Kingdom

“…A storm surge model of the North West European Continental Shelf, the southern North Sea, and the Thames Estuary was used to predict water levels at Canvey Island for different scenarios of meteorological and tidal forcing [ Brown , 2004]. The largest‐scale model was based on the Dutch Continental Shelf Model, which is used for operational forecasting of storm surges in the Netherlands [ Gerritsen et al , 1995]. Using a simple description of the geometry of a cyclone, together with observations of surface pressure from large historic storms, a parametric model was used to generate meteorological forcing for the flood model [see also Bijl , 1997].…”

A unified formulation for the three-dimensional shallow water equations using orthogonal co-ordinates: theory and application

“…Solving the transformed equations in spherical co-ordinates on a standard latitude-longitude spherical grid is common for large-scale tidal and surge modelling, see e.g. Schwiderski (1980), Flather (2000, Gerritsen et al (1995) and Williamson et al (1992). However, coastlines are again represented coarsely by staircase boundaries.…”

Riding the tide: intriguing observations of gulls resting at sea during breeding

“…The Zuno Model (Rijswijk, The Netherlands, Rijkswaterstaat) was used for assessing the tidal currents along the North Sea coast of The Netherlands. Currents were calculated with the Dutch Continental Shelf Model (Gerritsen et al. 1995) with a grid size resolution of 1/12°N and 1/8°E.…”

Modeling storm surge flooding of an urban area with particular reference to modeling uncertainties: A case study of Canvey Island, United Kingdom

“…A storm surge model of the North West European Continental Shelf, the southern North Sea, and the Thames Estuary was used to predict water levels at Canvey Island for different scenarios of meteorological and tidal forcing [ Brown , 2004]. The largest‐scale model was based on the Dutch Continental Shelf Model, which is used for operational forecasting of storm surges in the Netherlands [ Gerritsen et al , 1995]. Using a simple description of the geometry of a cyclone, together with observations of surface pressure from large historic storms, a parametric model was used to generate meteorological forcing for the flood model [see also Bijl , 1997].…”

A unified formulation for the three-dimensional shallow water equations using orthogonal co-ordinates: theory and application

“…Solving the transformed equations in spherical co-ordinates on a standard latitude-longitude spherical grid is common for large-scale tidal and surge modelling, see e.g. Schwiderski (1980), Flather (2000, Gerritsen et al (1995) and Williamson et al (1992). However, coastlines are again represented coarsely by staircase boundaries.…”