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The performance of the spectral wind wave model SWAN in tidal inlet seas was assessed on the basis of extensive wave measurements conducted in the Amelander Zeegat tidal inlet and the Dutch Eastern Wadden Sea, as well as relevant data from other inlets, lakes, estuaries and beaches. We found that the 2006 default SWAN model (version 40.51), the starting point of the investigation, performed reasonably well for measured storm conditions, but three aspects required further attention. First, over the near-horizontal tidal flats, the computed ratio of integral wave height over water depth showed an apparent upper limit using the default depth-limited wave breaking formulation and breaker parameter, resulting in an underprediction of wave heights. This problem has been largely solved using a new breaker formulation. The second aspect concerns wave-current interaction, specifically the wave age effect on waves generated in ambient current, and a proposed enhanced dissipation in negative current gradients. Third, the variance density of lower-frequency wind waves from the North Sea penetrating through the inlets into the Wadden Sea was underpredicted. This was improved by reducing the bottom friction dissipation relative to that of the default model. After a combined calibration, these improvements have resulted in a relative bias reduction in Hm0 from -3% to -1%, in Tm-1,0 from -7% to -3%, and in Tm01 from -6% to -2%, and consistent reductions in scatter, compared to the 2006 default model., Hydraulic Engineering, Civil Engineering and Geosciences

The performance of the spectral wind wave model SWAN in tidal inlet seas was assessed on the basis of extensive wave measurements conducted in the Amelander Zeegat tidal inlet and the Dutch Eastern Wadden Sea, as well as relevant data from other inlets, lakes, estuaries and beaches. We found that the 2006 default SWAN model (version 40.51), the starting point of the investigation, performed reasonably well for measured storm conditions, but three aspects required further attention. First, over the near-horizontal tidal flats, the computed ratio of integral wave height over water depth showed an apparent upper limit using the default depth-limited wave breaking formulation and breaker parameter, resulting in an underprediction of wave heights. This problem has been largely solved using a new breaker formulation. The second aspect concerns wave-current interaction, specifically the wave age effect on waves generated in ambient current, and a proposed enhanced dissipation in negative current gradients. Third, the variance density of lower-frequency wind waves from the North Sea penetrating through the inlets into the Wadden Sea was underpredicted. This was improved by reducing the bottom friction dissipation relative to that of the default model. After a combined calibration, these improvements have resulted in a relative bias reduction in Hm0 from -3% to -1%, in Tm-1,0 from -7% to -3%, and in Tm01 from -6% to -2%, and consistent reductions in scatter, compared to the 2006 default model., Hydraulic Engineering, Civil Engineering and Geosciences

De stormvloed van 1 november 2006, de Allerheiligenvloed genaamd, heeft na analyse van de waterstandsverwachting, de golfmetingen bij Schiermonnikoog Noord (SON), de veekranden en de duinafslag, geleid tot aanbevelingen voor het informatie- en kennisontwikkelingsproces. Het betreft aanbevelingen voor het instrumentarium van de SVSD, voor het inwinnen en interpreteren van gegevens en voor vervolgactiviteiten naar aanleiding van de gegevens van de Allerheiligenvloed 2006. In het volgende worden de conclusies voor het gebeurde tijdens de Allerheiligenvloed en de aanbevelingen voor het vervolg kort samengevat.

De stormvloed van 1 november 2006, de Allerheiligenvloed genaamd, heeft na analyse van de waterstandsverwachting, de golfmetingen bij Schiermonnikoog Noord (SON), de veekranden en de duinafslag, geleid tot aanbevelingen voor het informatie- en kennisontwikkelingsproces. Het betreft aanbevelingen voor het instrumentarium van de SVSD, voor het inwinnen en interpreteren van gegevens en voor vervolgactiviteiten naar aanleiding van de gegevens van de Allerheiligenvloed 2006. In het volgende worden de conclusies voor het gebeurde tijdens de Allerheiligenvloed en de aanbevelingen voor het vervolg kort samengevat.

Currently, the information on the history of the Benedictine Sisters and St. Scholastica's College is scattered around in various PowerPoint presentations, websites, and off course books and other analog media. For the Museum Archives, a more structured exhibition is aimed for, allowing visitors to browse the history of the Philippines, the Benedictine sisters and St. Scholastica's College in the past 100 years. This interactive exhibit will be the center piece of the Museum Archives of the Missionary Benedictine Sisters in the Philippines. We are to design such a system, and start to implement it. Also, we should ensure continuity of the project by making the staff familiar with the system. This way they can take it along after we are gone, maintaining it as its database grows, Electrical Engineering, Mathematics and Computer Science

Currently, the information on the history of the Benedictine Sisters and St. Scholastica's College is scattered around in various PowerPoint presentations, websites, and off course books and other analog media. For the Museum Archives, a more structured exhibition is aimed for, allowing visitors to browse the history of the Philippines, the Benedictine sisters and St. Scholastica's College in the past 100 years. This interactive exhibit will be the center piece of the Museum Archives of the Missionary Benedictine Sisters in the Philippines. We are to design such a system, and start to implement it. Also, we should ensure continuity of the project by making the staff familiar with the system. This way they can take it along after we are gone, maintaining it as its database grows, Electrical Engineering, Mathematics and Computer Science

Document(en) uit de collectie Chemische Procestechnologie, DelftChemTech, Applied Sciences

Document(en) uit de collectie Chemische Procestechnologie, DelftChemTech, Applied Sciences