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An Evaluation of a High-Resolution Operational Wave Forecasting System in the Adriatic Sea

2009
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Release : 2009
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Book Synopsis An Evaluation of a High-Resolution Operational Wave Forecasting System in the Adriatic Sea by :

Download or read book An Evaluation of a High-Resolution Operational Wave Forecasting System in the Adriatic Sea written by . This book was released on 2009. Available in PDF, EPUB and Kindle. Book excerpt: The SWAN (Simulating Waves Nearshore) wave model using wind inputs generated by the ALADIN 8-km, operational high-resolution, atmospheric model was run in real-time to provide surface waves forecast for the semi-enclosed Adriatic Sea in support of the "Dynamics of the Adriatic in Real-Time" (DART) field experiments. Together with predictions from other wave and wind models, the successful prediction of a high sea-state event by this model led to a real-time shifting of planned operations while at sea, allowing five ADCP moorings to be deployed just before a bora storm and associated storm waves arrived. The model was also able to simulate the spatial gradients in significant wave height observed by in-situ and remote-sensing measurements for a particular sirocco storm case study, providing an additional perspective in aiding interpretation of the model output of features. To further quantify prediction skill, the wave forecast performance over a 12-month period was evaluated against in-situ and altimeter measurements over the region. Correlation coefficients between forecast and in-situ measured significant wave heights were from 0.82 to 0.91 for the 24-h forecast and from 0.78 to 0.88 for the 48-h forecast. However, best-fit slope comparisons with in-situ wave data at five coastal locations show the forecast wave heights were underpredicted by 10% to 30%. Best-fit slope comparisons between modeled wind speeds, U10, and significant wave heights. Hs and altimeter-derived measurements show that model U10 was about 4% underpredicted, but Hs, was underpredicted by an average of 30%. The underprediction of SWAN Hs has a very significant location-dependent geographical variation ranging from 10% to over 50%.

Maritime Engineering and Technology

2012-11-26 Technology & Engineering
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Release : 2012-11-26
Genre : Technology & Engineering
Kind : eBook
Book Rating : 184/5 ( reviews)

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Book Synopsis Maritime Engineering and Technology by : Carlos Guedes Soares

Download or read book Maritime Engineering and Technology written by Carlos Guedes Soares. This book was released on 2012-11-26. Available in PDF, EPUB and Kindle. Book excerpt: Maritime Engineering and Technology includes the papers from the 1st International Conference on Maritime Technology and Engineering (MARTECH 2011, Lisbon, Portugal, 10-12 May 2011). MARTECH 2011 was held to commemorate 100 years of the Instituto Superior Tico (IST) in Lisbon, and the contributions in the present volume reflect the

Renewable Energies Offshore

2015-09-07 Technology & Engineering
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Release : 2015-09-07
Genre : Technology & Engineering
Kind : eBook
Book Rating : 850/5 ( reviews)

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Book Synopsis Renewable Energies Offshore by : C. Guedes Soares

Download or read book Renewable Energies Offshore written by C. Guedes Soares. This book was released on 2015-09-07. Available in PDF, EPUB and Kindle. Book excerpt: Renewable Energies Offshore includes the papers presented in the 1st International Conference on Renewable Energies Offshore (RENEW2014), held in Lisbon, 24-26 November 2014. The conference is a consequence of the importance of the offshore renewable energies worldwide and an opportunity to contribute to the exchange of information on the dev

Electrical Measuring Instruments and Measurements

2012-12-27 Computers
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Release : 2012-12-27
Genre : Computers
Kind : eBook
Book Rating : 461/5 ( reviews)

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Book Synopsis Electrical Measuring Instruments and Measurements by : S.C. Bhargava

Download or read book Electrical Measuring Instruments and Measurements written by S.C. Bhargava. This book was released on 2012-12-27. Available in PDF, EPUB and Kindle. Book excerpt: This book, written for the benefit of engineering students and practicing engineers alike, is the culmination of the author's four decades of experience related to the subject of electrical measurements, comprising nearly 30 years of experimental research and more than 15 years of teaching at several engineering institutions. The unique feature of this book, apart from covering the syllabi of various universities, is the style of presentation of all important aspects and features of electrical measurements, with neatly and clearly drawn figures, diagrams and colour and b/w photos that illustrate details of instruments among other things, making the text easy to follow and comprehend. Enhancing the chapters are interspersed explanatory comments and, where necessary, footnotes to help better understanding of the chapter contents. Also, each chapter begins with a "recall" to link the subject matter with the related science or phenomenon and fundamental background. The first few chapters of the book comprise "Units, Dimensions and Standards"; "Electricity, Magnetism and Electromagnetism" and "Network Analysis". These topics form the basics of electrical measurements and provide a better understanding of the main topics discussed in later chapters. The last two chapters represent valuable assets of the book, and relate to (a) "Magnetic Measurements", describing many unique features not easily available elsewhere, a good study of which is essential for the design and development of most electric equipment – from motors to transformers and alternators, and (b) "Measurement of Non-electrical Quantities", dealing extensively with the measuring techniques of a number of variables that constitute an important requirement of engineering measurement practices. The book is supplemented by ten appendices covering various aspects dealing with the art and science of electrical measurement and of relevance to some of the topics in main chapters. Other useful features of the book include an elaborate chapter-by-chapter list of symbols, worked examples, exercises and quiz questions at the end of each chapter, and extensive authors' and subject index. This book will be of interest to all students taking courses in electrical measurements as a part of a B.Tech. in electrical engineering. Professionals in the field of electrical engineering will also find the book of use.

Viability, Development, and Reliability Assessment of Coupled Coastal Forecasting Systems

2012
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Release : 2012
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Book Synopsis Viability, Development, and Reliability Assessment of Coupled Coastal Forecasting Systems by : Gaurav Singhal

Download or read book Viability, Development, and Reliability Assessment of Coupled Coastal Forecasting Systems written by Gaurav Singhal. This book was released on 2012. Available in PDF, EPUB and Kindle. Book excerpt: Real-time wave forecasts are critical to a variety of coastal and offshore opera- tions. NOAA's global wave forecasts, at present, do not extend into many coastal regions of interest. Even after more than two decades of the historical Exxon Valdez disaster, Cook Inlet (CI) and Prince William Sound (PWS) are regions that suffer from a lack of accurate wave forecast information. This dissertation develops high- resolution integrated wave forecasting schemes for these regions in order to meet the critical requirements associated with shipping, commercial and sport fishing vessel safety, and oil spill response. This dissertation also performs a detailed qualitative and quantitative assessment of the impact of various forcing functions on wave pre- dictions, and develops maps showing extreme variations in significant wave heights (SWHs). For instance, it is found that the SWH could vary by as much as 1 m in the northern CI region in the presence of currents (hence justifying the need for integration of the wave model with a circulation model). Such maps can be useful for several engineering operations, and could also serve as guidance tool as to what can be expected in certain regions. Aside from the system development, the issue of forecast reliability is also addressed for PWS region in the context of the associated uncertainty which confronts the manager of engineering operations or other planners. For this purpose, high-resolution 36-h daily forecasts of SWHs are compared with measurements from buoys and satellites for about a year. The results show that 70% of the peak SWHs in the range 5-8 m were predicted with an accuracy of 15% or less for a forecast lead time of 9 h. On average, results indicate 70% or greater likelihood of the prediction falling within a tolerance of ±(1*RMSE) for all lead times. This analysis could not be performed for CI due to lack of data sources.

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