scholarly journals WAVE MODELLING IN A COMPLEX ESTUARY: STUDY IN PREPARATION OF FIELD MEASUREMENT CAMPAIGN EEMS-DOLLARD ESTUARY

2018 ◽  
pp. 66
Author(s):  
Patrick Oosterlo ◽  
Jentsje W. Van der Meer ◽  
Bas Hofland ◽  
Gerbrant Van Vledder
Keyword(s):  
Prediction Models ◽  
Wave Model ◽  
Wave Modelling ◽  
Measurement Campaign ◽  
The North ◽  
Wave Measurements ◽  
Shelf Sea ◽  
Wave Models ◽  
Set Up ◽  
Insight Into

This paper considers the Eems-Dollard estuary in the north of the Netherlands, which is part of the shallow shelf sea the Wadden Sea. This estuary is a highly complex area with tidal flats and deep channels and is characterised by an offshore directed wind, posing a challenge to wave prediction models. As little measurements are available, a measurement campaign is set up to provide field data for verifying and improving these wave models. The paper presents the locations that are most suited for wave measurements in the estuary, insight in the performance of the phase-averaged numerical wave model SWAN, and insight in the processes that play a role in the area around the corner of the Eemshaven. Furthermore, it presents insight into the reliability and applicability of SWAN in this highly complex area. An analysis of propagation effects is performed, as well as a comparison between the SWAN version as used for the Dutch dike safety assessment and the newest version, used for development, which includes the state of the art parameterisations of the physics. Furthermore, modelling is done for a schematised version of the area around the corner of the Eemshaven, considering several different model settings. Large differences occur in the results between the two SWAN versions. These differences are studied in more detail, and the causes of these differences are identified.

scholarly journals Wave Energy Assessment and Wind Correlation for the North Region of Scotland, Hindcast Resource and Calibration, Investigating for Improvements of Physical Model for Adaptation to Temporal Correlation

2014 ◽  
Author(s):  
George Lavidas ◽  
Vengatesan Venugopal ◽  
Daniel Friedrich ◽  
Atul Argawal
Keyword(s):  
Wave Energy ◽  
Numerical Models ◽  
Energy Resource ◽  
Temporal Correlation ◽  
Wave Model ◽  
Resource Assessment ◽  
Wave Modelling ◽  
Energy Assessment ◽  
The North ◽  
Set Up

Wave energy sites around Scotland, are considered one of the most energetic waters, as they are exposed to the Atlantic Ocean. The amount of energy reaching the shoreline provides an opportunity for wave energy deployments. Currently, considerations on wave devices expect them to be installed at nearshore locations. That means that the potential wave resource has to be investigated, since deep to shallow water interactions alter the shape of propagated waves. Resource assessment for these regions is essential in order to estimate the available and extractable energy resource. Although several numerical models exist for wave modelling, not all are suitable for nearshore applications. For the present work, the nearshore wave model SWAN has been used to simulate waves for the Hebridean region. The set-up, calibration and validation of the model are discussed. The resulting wave conditions are compared with buoy measurements. Results indicate that the modelling technique performed well.

Nearshore Wave Modelling in a Norwegian Fjord

2020 ◽  
Author(s):  
Christos N. Stefanakos ◽  
Birgitte R. Furevik ◽  
Øyvind Knutsen ◽  
Konstantinos Christakos
Keyword(s):  
Wave Model ◽  
Wave Climate ◽  
Wave Modelling ◽  
Good Accordance ◽  
Norwegian Fjord ◽  
Wave Conditions ◽  
Wave Models ◽  
Model Setup ◽  
Offshore Wave

Abstract Phase averaged wave models is a good supplement of in situ measurements for the study of wave climate in a specific location. In spite of having been tested in smoothly varying coastal areas, they haven’t previously been systematically validated in complex topography (coastline and bathymetry) such as Norwegian fjords, due to lack of measurements. However, in planning for large fjord crossings, the Norwegian Public Roads Administration have launched a number of buoys which allow for validation of model setup. In the present work, nearshore wave conditions in the area of Sulafjord, central Norway, are investigated as derived from numerical modelling with several different setups, and are compared against in situ buoy measurements with good accordance. The analysis is carried out by transferring offshore wave conditions to the nearshore area by successive applications of the well-known third-generation wave model SWAN. As input has been used a very detailed bathymetry of the area, and time series of wind and wave parameters derived from ERA5 and NORA10 datasets. Various scenarios reconstructing the wave input spectra have been considered.

scholarly journals The Use of Thermal Infra-Red Imagery to Elucidate the Dynamics and Processes Occurring in Fog

Atmosphere ◽  
2020 ◽  
Vol 11 (3) ◽  
pp. 240 ◽  
Author(s):  
Jeremy Price ◽  
Kristian Stokkereit
Keyword(s):  
Prediction Models ◽  
Weather Prediction ◽  
Model Performance ◽  
Video Footage ◽  
Great Insight ◽  
Infra Red ◽  
Meteorological Observations ◽  
Set Up ◽  
Insight Into ◽  
Local Nature

Improving our ability to predict fog accurately is currently a high priority for Numerical Weather Prediction models. Such an endeavour requires numerous types of observations of real fog as a means to both better understand it and also provide an assessment of model performance. We consider the use of thermal infra-red imagery, used in conjunction with other meteorological observations, for the purposes of studying fog. Two cameras were used—a FLIR Systems Inc. A655sc and a FLIR Systems Inc. A65sc—which were set up to capture one image per minute. Images were then combined to provide video footage of nocturnal fog events. Results show that the imagery from such cameras can provide great insight into fog processes and dynamics, identifying interesting features not previously seen. Furthermore, comparison of imagery with conventional meteorological observations showed that the observations were often not capable of being used to delineate all of the processes affecting fog, due to their incomplete and local nature.

scholarly journals Performance of NCEP Regional Wave Models in Predicting Peak Sea States during the 2005 North Atlantic Hurricane Season*

2010 ◽  
Vol 25 (5) ◽  
pp. 1543-1567 ◽  
Author(s):  
Yung Y. Chao ◽  
Hendrik L. Tolman
Keyword(s):  
Wave Height ◽  
North Atlantic ◽  
Wave Model ◽  
Wind Forcing ◽  
Random Errors ◽  
Atlantic Hurricane ◽  
The North ◽  
Hurricane Wind ◽  
The North Atlantic ◽  
Wave Models

Abstract Unprecedented numbers of tropical cyclones occurred in the North Atlantic Ocean and the Gulf of Mexico in 2005. This provides a unique opportunity to evaluate the performance of two operational regional wave forecasting models at the National Centers for Environmental Prediction (NCEP). This study validates model predictions of the tropical cyclone–generated maximum significant wave height, simultaneous spectral peak wave period, and the time of occurrence against available buoy measurements from the National Data Buoy Center (NDBC). The models used are third-generation operational wave models: the Western North Atlantic wave model (WNA) and the North Atlantic Hurricane wave model (NAH). These two models have identical model physics, spatial resolutions, and domains, with the latter model using specialized hurricane wind forcing. Both models provided consistent estimates of the maximum wave height and period, with random errors of typically less than 25%, and timing errors of typically less than 5 h. Compared to these random errors, systematic model biases are negligible, with a typical negative model bias of 5%. It appears that higher wave model resolutions are needed to fully utilize the specialized hurricane wind forcing, and it is shown that present routine wave observations are inadequate to accurately validate hurricane wave models.

Operational Forecasting of Wind-Generated Waves by Hurricane Isabel at NCEP*

2005 ◽  
Vol 20 (4) ◽  
pp. 544-557 ◽  
Author(s):  
Hendrik L. Tolman ◽  
Jose-Henrique G. M. Alves ◽  
Yung Y. Chao
Keyword(s):  
North Atlantic ◽  
Wave Model ◽  
The United States ◽  
Wind Fields ◽  
The North ◽  
Operational Forecasting ◽  
Model Improvement ◽  
Hurricane Isabel ◽  
Wave Models ◽  
Environmental Prediction

Abstract The accuracy of the operational wave models at the National Centers for Environmental Prediction (NCEP) for sea states generated by Hurricane Isabel is assessed. The western North Atlantic (WNA) and the North Atlantic hurricane (NAH) wave models are validated using analyzed wind fields, and wave observations from the Jason-1 altimeter and from 15 moored buoys. Both models provided excellent guidance for Isabel in the days preceding landfall of the hurricane along the east coast of the United States. However, the NAH model outperforms the WNA model in the initial stages of Isabel, when she was a category 5 hurricane. The NAH model was also more accurate in providing guidance for the swell systems arriving at the U.S. coast well before landfall of Isabel. Although major model deficiencies can be attributed to shortcomings in the driving wind fields, several areas of potential wave model improvement have been identified.

Teacher digital competence: bringing education to the next level

2020 ◽  
Vol 11 (1) ◽  
pp. 22-26
Author(s):  
S.V. Tsymbal ◽  
Keyword(s):  
Deep Learning ◽  
Learning Experiences ◽  
Digital Competence ◽  
Digital Revolution ◽  
Access Information ◽  
Set Up ◽  
Insight Into ◽  
The Way

The digital revolution has transformed the way people access information, communicate and learn. It is teachers' responsibility to set up environments and opportunities for deep learning experiences that can uncover and boost learners’ capacities. Twentyfirst century competences can be seen as necessary to navigate contemporary and future life, shaped by technology that changes workplaces and lifestyles. This study explores the concept of digital competence and provide insight into the European Framework for the Digital Competence of Educators.

The Rotterdam Initiative in Reducing Waste Discharges at Source

1991 ◽  
Vol 24 (10) ◽  
pp. 171-177
Author(s):  
T. Vellinga ◽  
J. P. J. Nijssen
Keyword(s):  
Public Relations ◽  
Action Plan ◽  
Detailed Balance ◽  
River Rhine ◽  
The North ◽  
Complementary Role ◽  
Action Programme ◽  
The North Sea ◽  
Set Up

Much of the material dredged from the port of Rotterdam is contaminated to such a degree that it must be placed in specially constructed sites. The aim of Rotterdam is to ensure that the dredged material will once again be clean. This will entail the thorough cleansing of the sources of the contamination of the sediment in the harbours and in the River Rhine. The Rotterdam Rhine Research Project (RRP) is one of the means to achieve this based on: technical research, legal research, public relations and dialogues with dischargers. The programme for five selected heavy metals is almost complete. For many heavy metal discharge points between Rotterdam and Rheinfelden, a specially devised independent load assessment has been carried out four times. Balance studies were used to determine the relative contributions of the point discharges to the total. Currently the results are being used in an attempt to negotiate agreements with a selected number of the major dischargers. At present, more detailed balance studies are being set up and exploratory measurements carried out for organic micropollutants. It may be concluded that the research is progressing successfully and methods and techniques developed seem satisfactory and broadly applicable. The Rhine Action Programme encompasses an international effort to improve the quality of the Rhine water. Although the RRP plays a modest complementary role to the Rhine Action Plan, there is no doubt of the value of this Rotterdam initiative. The mode of work followed in the RRP contains elements that can be of use in combatting the contamination of the North Sea by rivers other than the Rhine.

Excavations at Fishbourne, 1963. Third Interim Report

1964 ◽  
Vol 44 (1) ◽  
pp. 1-8
Keyword(s):  
Interim Report ◽  
The West ◽  
Civic Society ◽  
North West ◽  
The Third ◽  
North East ◽  
The North ◽  
The Future ◽  
Set Up

Early in 1963 much of the land occupied by the Roman building at Fishbourne was purchased by Mr. I. D. Margary, M.A., F.S.A., and was given to the Sussex Archaeological Trust. The Fishbourne Committee of the trust was set up to administer the future of the site. The third season's excavation, carried out at the desire of this committee, was again organized by the Chichester Civic Society.1 About fifty volunteers a day were employed from 24th July to 3rd September. Excavation concentrated upon three main areas; the orchard south of the east wing excavated in 1962, the west end of the north wing, and the west wing. In addition, trial trenches were dug at the north-east and north-west extremities of the building and in the area to the north of the north wing. The work of supervision was carried out by Miss F. Pierce, M.A., Mr. B. Morley, Mr. A. B. Norton, B.A., and Mr. J. P. Wild, B.A. Photography was organized by Mr. D. B. Baker and Mrs. F. A. Cunliffe took charge of the pottery and finds.

Getting the Core: A Neo‐institutionalist Approach to the EMU

1995 ◽  
Vol 30 (3) ◽  
pp. 347-369 ◽  
Author(s):  
Miriam L. Campanella
Keyword(s):  
Financial Markets ◽  
Monetary Union ◽  
Trade Agreement ◽  
Maastricht Treaty ◽  
Convergence Criteria ◽  
The North ◽  
Single European Act ◽  
Effective Role ◽  
Set Up ◽  
New Institutions

THE NEW REGIONALISM, MANIFESTED IN EUROPE BY THE SINGLE European Act and the Maastricht Treaty (1992) and in North America by the signature of the North-American Free Trade Agreement (NAFTA 1993), is centred on strategic policies and new institutions, the aims of which are to achieve a more effective role in global competition. In Europe, the shift is marked by the impending process of monetary union and the creation of its related institutions. The new approach agreed in the Maastricht Treaty sets out four requirements for eligibility to membership of monetary union. Convergence criteria embodying the judgment of financial markets about future inflation, exchange rate and fiscal policy appeared to be the second best choice for governments seeking to institutionalize their commitment to inflation-avoiding policies. The whole mechanism is meant first to provide the region with a credible monetary institution able to win over the financial markets and secondly to set up bulwarks to the inflation-prone pressures of domestic sheltered interests. Thirdly, the aim is to commit member countries, through a so-called targeting exercise (in Keohane's words) to accomplishing the agreed objectives with monetary discipline and macroeconomic adjustment.

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