Numerical Modeling of Nearshore Morphological Changes Under Current-wave Field PDF Download
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Author: Taerim Kim
Publisher:
ISBN:
Category : Beach erosion
Languages : en
Pages : 142
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Book Description
Author: Taerim Kim
Publisher:
ISBN:
Category : Beach erosion
Languages : en
Pages : 142
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Book Description
Author: Dano Roelvink
Publisher: World Scientific
ISBN: 9814304263
Category : Science
Languages : en
Pages : 291
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Book Description
Key Features:There is currently no comprehensive textbook on coastal morphology ModelingProcess-based morphodynamic Modeling is rapidly becoming very useful and the authors have strongly contributed to this developmentCoastal morphology Modeling is an essential tool in a world that is facing increasing threats from coastal erosion, climate change and increasing population in coastal areas.
Author: David R. Michalsen
Publisher:
ISBN:
Category : Borrow pits
Languages : en
Pages : 260
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Book Description
Steep bathymetric anomalies in the beach profile, such as offshore borrow pits, submerged breakwaters, and nearshore canyons can significantly transform the wave climate through the effects of refraction, diffraction, and reflection. When located in the nearshore region the modified wave climate can also substantially change the location of breaking and has been observed to impact the shoreline morphology. The current study focuses on the borrow pit case and attempts to explain how limitations in existing methodologies may impact the predictions in both the wave field modification and shoreline response. Recent analytical methods by Bender (2003) have successfully explained the wave transformation near pits. However, these models are only capable of modeling bathymetries of constant depth surrounding the anomaly. Therefore in order to investigate cases without this restriction, this often requires numerical solutions following Berkhoff's (1972) mild-slope equation (MSE). However, a significant limitation of these model types is the accuracy suffers for steep bathymetric features. Booij (1983) demonstrates this for slopes larger than 1:3 (rise:run). Furthermore, these models often rely on Radder's (1979) parabolic approximation to the MSE which restricts the ability to include wave reflection which can be substantial in the case of a borrow pit. These limitations and their effects on shoreline response are investigated in the current study. By utilizing a form of the modified mild-slope equation (MMSE) originally derived by Massel (1993) the limitation of the MSE in representing steep features is removed. Additionally, a numerical model following Lee et al. (1998) is employed to investigate wave transformation around borrow pits of arbitrary depth. The formulation of the model is of hyperbolic form; therefore, the reflected waves generated by a borrow pit are included. The models accuracy is validated through a rigorous set of tests showing that the model compares well with previous analytical solutions for steep features. To estimate the importance of wave reflection, information from documented borrow sites is gathered. Using dimensionless parameters relating the incident waves and the pit geometry, an estimate of the amount of reflection generated by each borrow pit is calculated. It is shown that upward of 30% of the wave energy can be reflected by a borrow pit. Additionally, it is shown as wave frequency increases (or kh located in the intermediate depth region), the MSE's inaccuracy in predicting reflection is enhanced. Expanding on this conclusion, a parametenzation analysis is performed. The analysis describes conditions under which resonance inside the trench capable of producing large reflection is reached. The study serves as preliminary design guidance which can be used to avoid borrow pit geometries that are capable of producing a large amount of reflection. It is also of interest to describe how the effects of reflection affect the regions far shoreward of the pit. Employing a form of the MMSE model, the evolution of the wave field is analyzed. It was found that although the effects of reflection are strong near the borrow pit, as the distance leeward of the pit increases the effects of refraction and diffraction outweigh the impacts of reflection. Thus, the result using a wave model including reflection would not substantially differ from that of using a model that neglects the reflected waves when investigating the impacts on shoreline evolution. Finally, the last part of the study looks at the validity of utilizing current shoreline response models for this particular problem. Wave height and direction at breaking dictate how one-line models predict shoreline response. However, these models fail to include the effect that longshore gradients in wave height have on generating mean water level (MWL) gradients. MWL gradients in wave height are capable of producing longshore currents which can significantly alter the sediment transport trends. Coupling the MMSE wave model with a 2DH nearshore circulation model shows that MWL gradients have a significant impact on current generation. Results indicate that incipient rip currents result from the converging currents associated with the MWL gradients. The presence of these currents would thereby dictate a new sediment transport trend, possibly transporting sediment offshore instead of in the theorized salient formation predicted by one-line models.
Author: Richard P. Signell
Publisher: MDPI
ISBN: 3038423629
Category : Computers
Languages : en
Pages : 421
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Book Description
This book is a printed edition of the Special Issue "Selected Papers from the 14th Estuarine and Coastal Modeling Conference" that was published in JMSE
Author: V.C. Lakhan
Publisher: Elsevier
ISBN: 0080526640
Category : Science
Languages : en
Pages : 614
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Book Description
This book unifies and enhances the accessibility of contemporary scholarly research on advances in coastal modeling. A comprehensive spectrum of innovative models addresses the wide diversity and multifaceted aspects of coastal research on the complex natural processes, dynamics, interactions and responses of the coastal supersystem and its associated subsystems. The twenty-one chapters, contributed by internationally recognized coastal experts from fourteen countries, provide invaluable insights on the recent advances and present state-of-the-art knowledge on coastal models which are essential for not only illuminating the governing coastal process and various characteristics, but also for understanding and predicting the dynamics at work in the coastal system. One of the unique strengths of the book is the impressive and encompassing presentation of current functional and operational coastal models for all those concerned with and interested in the modeling of seas, oceans and coasts. In addition to chapters modeling the dynamic natural processes of waves, currents, circulatory flows and sediment transport there are also chapters that focus on the modeling of beaches, shorelines, tidal basins and shore platforms. The substantial scope of the book is further strengthened with chapters concentrating on the effects of coastal structures on nearshore flows, coastal water quality, coastal pollution, coastal ecological modeling, statistical data modeling, and coupling of coastal models with geographical information systems.
Author:
Publisher: World Scientific
ISBN:
Category :
Languages : en
Pages : 913
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Book Description
Author: Jane Mckee Smith
Publisher: World Scientific
ISBN: 9814480525
Category : Science
Languages : en
Pages : 4836
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Book Description
This comprehensive and up-to-date volume contains 367 papers presented at the 29th International Conference on Coastal Engineering, held in Lisbon, Portugal, 19-24 September 2004. It is divided into five parts: waves; long waves, nearshore currents, and swash; sediment transport and morphology; coastal management, beach nourishment, and dredging; coastal structures. The contributions cover a broad range of topics including theory, numerical and physical modeling, field measurements, case studies, design, and management. Coastal Engineering 2004 provides engineers, scientists, and planners state-of-the-art information on coastal engineering and coastal processes.The proceedings have been selected for coverage in:
Author: Santiago Alfageme
Publisher:
ISBN:
Category : Ocean waves
Languages : en
Pages : 148
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Book Description
Author: Amir Sharifahmadian
Publisher: Butterworth-Heinemann
ISBN: 0128026650
Category : Technology & Engineering
Languages : en
Pages : 364
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Book Description
Numerical Models for Submerged Breakwaters: Coastal Hydrodynamics and Morphodynamics discusses the practice of submerged breakwaters, an increasingly popular tool used as a coastal defense system because of their amenity and aesthetics as compared to common emerged beach protection measures. The book is the perfect guide for experienced professionals who wish to keep abreast of the latest best practices or those who are entering the field and need a reference, explaining new and traditional numerical methodologies for designing submerged breakwaters and measuring their performance. In addition, the book provides case studies, examples, and practical methods for data selection and pre-processing, model setup, calibration, and analysis. Case studies and worked-out examples illustrate different concepts and methods Offers practical methods for Data Selection and Pre-Processing Provides simplified prediction tools for practical applications
Author: Hans Hanson
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 1110
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Book Description
This collection contains 109 papers presented at the Fourth Conference on Coastal Dynamics, held in Lund, Sweden, June 11-15, 2001.
