scholarly journals Dynamics of Sediment Transport and Erosion-Deposition Patterns in the Locality of a Detached Low-Crested Breakwater on a Cohesive Coast

Water ◽  
2019 ◽  
Vol 11 (8) ◽  
pp. 1721 ◽  
Author(s):  
Arniza Fitri ◽  
Roslan Hashim ◽  
Soroush Abolfathi ◽  
Khairul Nizam Abdul Maulud
Keyword(s):  
Sediment Transport ◽  
Structural Design ◽  
Transport Model ◽  
Field Measurements ◽  
Sediment Supply ◽  
Sediment Type ◽  
Coastal Structures ◽  
Deposition Patterns ◽  
Secondary Sources ◽  
Sea Bed

Understanding the dynamics of sediment transport and erosion-deposition patterns in the locality of a coastal structure is vital to evaluating the performance of coastal structures and predicting the changes in coastal dynamics caused by a specific structure. The nearshore hydro-morphodynamic responses to coastal structures vary widely, as these responses are complex functions with numerous parameters, including structural design, sediment and wave dynamics, angle of approach, slope of the coast and the materials making up the beach and structures. This study investigated the sediment transport and erosion-deposition patterns in the locality of a detached low-crested breakwater protecting the cohesive shore of Carey Island, Malaysia. The data used for this study were collected from field measurements and secondary sources from 2014 to 2015. Sea-bed elevations were monitored every two months starting from December 2014 to October 2015, in order to quantify the sea-bed changes and investigate the erosion-deposition patterns of the cohesive sediment due to the existence of the breakwater. In addition, numerical modelling was also performed to understand the impacts of the breakwater on the nearshore hydrodynamics and investigate the dynamics of fine sediment transport around the breakwater structure. A coupled two-dimensional hydrodynamics-sediment transport model based on Reynolds averaged Navier-Stokes (RANS) equations and cell-centered finite volume method with flexible meshing approach was adopted for this study. Analysis of the results showed that the detached breakwater reduced both current speed and wave height behind the structure by an average of 0.12 m/s and 0.1 m, respectively. Also, the breakwater made it possible for trapped suspended sediment to settle in a sheltered area by approximately 8 cm in height near to the first main segment of the breakwater, from 1 year after its construction. The numerical results were in line with the field measurements, where sediment accumulations were concentrated in the landward area behind the breakwater. In particular, sediment accumulations were concentrated along the main segments of the breakwater structure during the Northeast (NE) season, while concentration near the first main segment of the breakwater were recorded during the Southwest (SW) season. The assessment illustrated that the depositional patterns were influenced strongly by the variations in seasonal hydrodynamic conditions, sediment type, sediment supply and the structural design. Detached breakwaters are rarely considered for cohesive shores; hence, this study provides new, significant benefits for engineers, scientists and coastal management authorities with regard to seasonal dynamic changes affected by a detached breakwater and its performance on a cohesive coast.

scholarly journals Sediment Transport and Water Flow Resistance in Alluvial River Channels: Modified Model of Transport of Non-Uniform Grain-Size Sediments

Water ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2038
Author(s):  
Gennady Gladkov ◽  
Michał Habel ◽  
Zygmunt Babiński ◽  
Pakhom Belyakov
Keyword(s):  
Sediment Transport ◽  
Water Flow ◽  
Transport Model ◽  
Flow Characteristics ◽  
Field Measurements ◽  
Field Investigation ◽  
Empirical Modeling ◽  
River Channels ◽  
Channel Deformations ◽  
East European

The paper presents recommendations for using the results obtained in sediment transport simulation and modeling of channel deformations in rivers. This work relates to the issues of empirical modeling of the water flow characteristics in natural riverbeds with a movable bottom (alluvial channels) which are extremely complex. The study shows that in the simulation of sediment transport and calculation of channel deformations in the rivers, it is expedient to use the calculation dependences of Chézy’s coefficient for assessing the roughness of the bottom sediment mixture, or the dependences of the form based on the field investigation data. Three models are most commonly used and based on the original formulas of Meyer-Peter and Müller (1948), Einstein (1950) and van Rijn (1984). This work deals with assessing the hydraulic resistance of the channel and improving the river sediment transport model in a simulation of riverbed transformation on the basis of previous research to verify it based on 296 field measurements on the Central-East European lowland rivers. The performed test calculations show that the modified van Rijn formula gives the best results from all the considered variants.

COASTAL ENGINEERING 2002

2002 ◽  
Vol 1 (28) ◽  
Author(s):  
Jane McKee Smith
Keyword(s):  
Sediment Transport ◽  
Coastal Management ◽  
Physical Modeling ◽  
State Of The Art ◽  
Field Measurements ◽  
Coastal Engineering ◽  
Coastal Processes ◽  
Coastal Structures ◽  
Coastal Morphology ◽  
Coastal Waves

*** Available Only Through World Scientific *** http://www.worldscibooks.com/engineering/5165.html This book contains more than 300 papers presented at the 28th International Conference on Coastal Engineering, held in Cardiff, Wales, in July 2002. It is divided into five parts: coastal waves; nearshore currents, swash, and long waves; coastal structures; sediment transport; and coastal morphology, beach nourishment, and coastal management. The papers cover a broad range of topics, including theory, numerical and physical modeling, field measurements, case studies, design, and management. Coastal Engineering 2002 provides engineers, scientists, and planners with state-of-the-art information on coastal engineering and coastal processes.

scholarly journals FOREWORD: Proceedings of the 36th International Conference

2018 ◽  
pp. 1
Author(s):  
Patrick J. Lynett
Keyword(s):  
Sediment Transport ◽  
Coastal Management ◽  
Physical Modeling ◽  
State Of The Art ◽  
Field Measurements ◽  
Coastal Engineering ◽  
The Other ◽  
Coastal Processes ◽  
Coastal Structures ◽  
International Conference

This Proceedings contains 550 papers from the 36th International Conference on Coastal Engineering, which was held in Baltimore, Maryland from July 30 to August 3, 2018. The Proceedings is divided into six parts: Papers; Waves; Swash, Nearshore Currents, and Long Waves; Sediment Transport and Morphology; Coastal Structures; and Coastal Management, Environment, and Risk. The “Papers” sections includes full length Proceedings papers, covering a broad range of topics including theory, numerical and physical modeling, field measurements, case studies, design, and management. The other sections include abstract and presentation files, as presented at the conference. These submissions provide engineers, scientists, and planners state-of-the-art information on coastal engineering and coastal processes.

Foreword: Proceedings of the 32nd International Conference

2011 ◽  
Vol 1 (32) ◽  
pp. 1 ◽  
Author(s):  
Jane McKee Smith ◽  
Patrick J. Lynett
Keyword(s):  
Sediment Transport ◽  
Coastal Management ◽  
Physical Modeling ◽  
State Of The Art ◽  
Field Measurements ◽  
Coastal Engineering ◽  
Coastal Processes ◽  
Coastal Structures ◽  
International Conference ◽  
The Individual

This Proceedings contains 360 papers and 15 posters presented at the 32nd International Conference on Coastal Engineering, which was held in Shanghai, China, 30 June to 5 July 2010. The Proceedings is divided into seven parts: Keynote; Waves; Swash, Nearshore Currents, and Long Waves; Sediment Transport and Morphology; Coastal Structures; Coastal Management, Environment, and Risk, and Posters. The individual papers cover a broad range of topics including theory, numerical and physical modeling, field measurements, case studies, design, and management. These papers provide engineers, scientists, and planners state-of-the-art information on coastal engineering and coastal processes.

COASTAL ENGINEERING 2008

2008 ◽  
Vol 1 (31) ◽  
Author(s):  
Jane McKee Smith
Keyword(s):  
Sediment Transport ◽  
Case Studies ◽  
Coastal Management ◽  
Physical Modeling ◽  
State Of The Art ◽  
Field Measurements ◽  
Coastal Engineering ◽  
Coastal Processes ◽  
Coastal Structures ◽  
International Conference

*** Available Only Through World Scientific *** http://www.worldscibooks.com/engineering/7342.html This proceedings contains papers presented at the 31st International Conference on Coastal Engineering, which has held in Hamburg, Germany (31 August – 5 September 2008). The proceeding is divided into five parts: Waves; Long Waves, Nearshore Currents, and Swash; Sediment Transport and Morphology; Coastal Management, Environment, and Risk; and Coastal Structures. The papers cover a broad range of topics including theory, numerical and physical modeling, field measurements, case studies, design, and management. Coastal Engineering 2008 provides coastal engineers, scientists, and planners, with state-of-the-art information on coastal engineering and coastal processes.

scholarly journals FOREWORD: Proceedings of the 35th International Conference

2017 ◽  
pp. 1
Author(s):  
Patrick J. Lynett
Keyword(s):  
Sediment Transport ◽  
Coastal Management ◽  
Physical Modeling ◽  
State Of The Art ◽  
Field Measurements ◽  
Coastal Engineering ◽  
Coastal Processes ◽  
Coastal Structures ◽  
International Conference ◽  
The Individual

This Proceedings contains 170 papers from the 35th International Conference on Coastal Engineering, which was held in Antalya, Turkey from November 17 to November 20, 2016. The Proceedings is divided into six parts: Waves; Swash, Nearshore Currents, and Long Waves; Sediment Transport and Morphology; Coastal Structures; Coastal Management, Environment, and Risk, and Posters. The individual papers cover a broad range of topics including theory, numerical and physical modeling, field measurements, case studies, design, and management. These papers provide engineers, scientists, and planners state-of-the-art information on coastal engineering and coastal processes.

scholarly journals SIMULATION OF SORTING SEDIMENTATION IN THE CHANNEL OF HUANGHUA HARBOR BY USING 3D MULTI-SIZED SEDIMENT TRANSPORT MODEL OF EFDC

2011 ◽  
Vol 1 (32) ◽  
pp. 22
Author(s):  
Qinghe Zhang ◽  
Feng Tan ◽  
Tao Han ◽  
Xiaoyuan Wang ◽  
Zhiqiang Hou ◽  
...  
Keyword(s):  
Sediment Transport ◽  
Transport Model ◽  
Sediment Concentration ◽  
Bohai Bay ◽  
Storm Events ◽  
South West ◽  
Sea Bed ◽  
South West Coast ◽  
Efdc Model ◽  
High Sediment

Huanghua Harbor, located in the south-west coast of Bohai Bay, China, has frequently encountered severe channel siltation with sorting sedimentation along the channel during storm events since its construction. For prediction of channel siltation, a 3D numerical model of multi-fraction sediment transport based on the coupling of modified EFDC model and SWAN model is developed to investigate the sediment transport. It is shown from simulated results that the sorted sedimentation in the channel was well simulated in storm events, and the high sediment concentration near sea bed for silty coast during storm process can also be basically reflected by the model.

scholarly journals AEOLIAN SEDIMENT TRANSPORT AT A MAN-MADE DUNE SYSTEM; BUILDING WITH NATURE AT THE HONDSBOSSCHE DUNES

2018 ◽  
pp. 83 ◽  
Author(s):  
Marloes Wittebrood ◽  
Sierd De Vries ◽  
Petra Goessen ◽  
Stefan Aarninkhof
Keyword(s):  
Sediment Transport ◽  
Transport Model ◽  
Morphological Changes ◽  
Morphological Evolution ◽  
Sediment Supply ◽  
Dune System ◽  
Morphological Response ◽  
Profile Type ◽  
Building With Nature ◽  
Aeolian Sediment

This paper presents the influence of aeolian sediment transport on the initial morphological evolution of beach and dunes at the man-made dune system ‘Hondsbossche Dunes’ at the Dutch coast. In total 35 million m^3 dredged material was used for the construction of a beach, dune and foreshore system. This study focused on differences in morphological response within the five different realized dune profile types. A conceptual framework was developed, based on the assessment of (1) environmental forcing, (2) sediment supply from aeolian and marine sources and (3) dune types. These three components were quantified from an analysis of measured profile evolution and the application of an aeolian sediment transport model for the first 19 months since the project delivery date in May 2015. Morphological changes were most pronounced in the first seven months after construction. Dune growth of a profile type at this location is determined by a temporal and alongshore variability in local processes that determines the aeolian sediment supply towards the dunes and the dune geometry that determines the capacity of the profile type to capture the sediments. The model simulations managed to qualitatively reproduce alongshore variations in dune growth as a result of spatial variations in sediment availability, grain size, profile shape and interaction with vegetation. Overall, this study shows the relevance of both marine and aeolian processes in such man-made dynamic systems that are comparable to natural systems. Continuing the monitoring and modelling of this system will improve the quantitative knowledge for design optimization of the Building with Nature philosophy.

scholarly journals The Effect of Wave-Induced Current and Coastal Structure on Sediment Transport at the Zengwen River Mouth

2021 ◽  
Vol 9 (3) ◽  
pp. 333
Author(s):  
Chun-Hung Pao ◽  
Jia-Lin Chen ◽  
Shih-Feng Su ◽  
Yu-Ching Huang ◽  
Wen-Hsin Huang ◽  
...  
Keyword(s):  
Sediment Transport ◽  
Finite Difference ◽  
Finite Volume ◽  
Morphological Evolution ◽  
River Mouth ◽  
Water Levels ◽  
Coastal Structures ◽  
Sea Bed ◽  
Residual Transport ◽  
Wave Induced

The mechanisms that control estuarine sediment transport are complicated due to the interaction between riverine flows, tidal currents, waves, and wave-driven currents. In the past decade, severe seabed erosion and shoreline retreat along the sandy coast of western Taiwan have raised concerns regarding the sustainability of coastal structures. In this study, ADCPs(Acoustic Doppler Current Profiler) and turbidity meters were deployed at the mouth of the Zengwen river to obtain the time series and the spatial distribution of flow velocities and turbidity during the base flow and flood conditions. A nearshore circulation model, SHORECIRC, has been adapted into a hybrid finite-difference/finite-volume, TVD (Total Variation Diminishing)-type scheme and coupled with the wave-spectrum model Simulating Waves Nearshore (SWAN). Conventional finite-difference schemes often produce unphysical oscillations when modeling coastal processes with abrupt bathymetric changes at river mouths. In contrast, the TVD-type finite volume scheme allows for robust treatment of discontinuities through the shock-capturing mechanism. The model reproduces water levels, waves, currents observed at the mouth of the Zengwen River reasonably well. The simulated residual sediment transport patterns demonstrate that the transport process at the river mouth is dominated by the interaction of the bathymetry and wave-induced currents when the riverine discharge was kept in reservoirs. The offshore residual transport causes erosion at the northern part of the river mouth, and the onshore residual transport causes accretion in the ebb tidal shoals around the center of the river mouth. The simulated morphological evolution displays significant changes on shallower deltas. The location with significant sea bed changes is consistent with the spot in which severe erosion occurred in recent years. Further analysis of morphological evolution is also discussed to identify the role of coastal structures, for example, the extension of the newly constructed groins near the river mouth.

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