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Journal articles on the topic "Sand spit morpho dynamic":
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Sathish, S., R. S. Kankara, S. Chenthamil Selvan, M. Umamaheswari, and R. Arthur James. "Sedimentary Facies and Morpho-dynamics of Sand Spit and Island Inference as Coastal River Process." Journal of the Geological Society of India 99, no. 7 (July 6, 2023): 951–64. http://dx.doi.org/10.1007/s12594-023-2416-8.
Sapkale, J. B., M. M. Mane, N. K. Susware, and S. J. Sapkale. "Dynamic Changes in Coastal Geomorphology of Shiroda Coasts, using Remote Sensing and GIS: An Approach to Climate Change and Coastal Disaster Risk." Disaster Advances 16, no. 12 (November 5, 2023): 20–32. http://dx.doi.org/10.25303/1612da020032.
The coastline is a unique land feature formed through the interaction between land and sea. It is essential to monitor and detect hotspots and observe spatial and temporal influences of climate change in the coastal environment. Coastal landform changes can be best studied through remote sensing data. This study examines the dynamic changes in the sand spit and associated coastal area of the Shiroda coasts of Sindhudurg district. The Normalized Difference Water Index (NDWI) was used to distinguish land and water and the area was calculated by reclassifying the NDWI index of all images with two classes- land surface of sand spit and water. It was found that the spit area is decreasing seasonally at a dynamic rate. Additionally, geomorphic maps were prepared for the study area and showed disastrous changes in the coastal landforms. It is a need that coastal communities worldwide must address the challenges of coastal flooding and rising sea levels caused by climate change. Climate change is causing uneven rainfall distribution, storms and cyclones, leading to coastal erosion, flooding and landform damage. Additionally, it has a negative impact on the geomorphic features of coastlines.
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Duc Anh, Nguyen Quang, Hitoshi Tanaka, Ho Sy Tam, Nguyen Xuan Tinh, Tran Thanh Tung, and Nguyen Trung Viet. "Comprehensive Study of the Sand Spit Evolution at Tidal Inlets in the Central Coast of Vietnam." Journal of Marine Science and Engineering 8, no. 9 (September 18, 2020): 722. http://dx.doi.org/10.3390/jmse8090722.
Tidal inlets along the central coast of Vietnam are located in a microtidal, wave-dominated coastal environment. In addition, the Vietnam coast is highly influenced by the seasonal monsoon regime, which is characterized by large northeast waves from October to March and calm southeast waves from April to September every year. Consequently, the tidal inlet entrance morphologies often suffer from a dynamic seasonal evolution due to distinct differences in the direction of wave-induced longshore sediment transport (LST) between the two monsoon seasons. The migration or closure of tidal inlets causes a lot of problems for socio-economic development in the region since these are the main reasons leading to an increase in the risk of coastal flooding and the obstruction of navigation. This paper presents a comprehensive study of the morphological evolutions of natural tidal inlets on the central coast of Vietnam using long-term remote sensing data sets and by the Delft3D numerical model. Surprisingly, the estimated LST rates from the former method are in an order of magnitude agreement with the results from the latter one for all of the areas in this study. Based on the conservation equation for sand and comprehensive data collection, a new simple empirical formula for predicting the sand spit elongation rate as a function of the sand spit width is developed. Although the breaching of sand spit might happen during an extreme flood event at some tidal inlets, the growth rate of the spit before and after the breaching is almost unchanged. These findings are very useful information for supporting the local coastal authorities to find better management solutions in terms of sustainable development.
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Georgiou, Ioannis Y., Francesca Messina, Md Mohiuddin Sakib, Shan Zou, Madeline Foster-Martinez, Martijn Bregman, Christopher J. Hein, et al. "Hydrodynamics and Sediment-Transport Pathways along a Mixed-Energy Spit-Inlet System: A Modeling Study at Chincoteague Inlet (Virginia, USA)." Journal of Marine Science and Engineering 11, no. 5 (May 18, 2023): 1075. http://dx.doi.org/10.3390/jmse11051075.
Tidal-inlet systems are dynamic features that respond to short-term (e.g., storms) and longer-term processes (e.g., sea-level rise, changes in tidal prism). The Chincoteague Inlet system, located along the northern Eastern Shore of Virginia (USA), is a dynamic coastal complex that experiences rapid change associated with sediment redistribution and a shifting inlet throat due to the southern elongation of adjacent Assateague Island. In this study, a numerical model based on Delft3D with coupled flow–waves, multiclass sediment transport, and morphologic feedback was developed to quantify the hydrodynamic and geomorphic controls within this rapidly evolving inlet–spit system and to develop a more comprehensive understanding of regional to local controls on sediment-transport pathways. Model results show that most of the sand transport along southern Assateague Island is sequestered nearshore and proximally in deeper sinks within Fishing Point, and, of that, only finer sand sizes are transported around the spit, confirming previous analysis and hypothesis. The model also showed that sand transport toward the south increases along Wallops Island and quantified spatially explicit transport trends for selected sediment classes, revealing that coarser sediment bypassing is a punctuated process that is proportional to storms.
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Escudero, Mireille, Gregorio Posada, Beatriz Edith Vega, and Edgar Mendoza. "MONITORING OF THE COASTAL DYNAMICS ON THE SAND SPIT AT TORTUGUEROS BEACH, MEXICO." Coastal Engineering Proceedings, no. 37 (September 1, 2023): 52. http://dx.doi.org/10.9753/icce.v37.management.52.
Sand spits occur worldwide in different shapes, from a single, relatively simple arc to an irregular, crenulated, and complex barrier. Cross-shore and longshore sediment transport often influence spit dynamics (Nagarajan et al., 2015), strongly linked to wave energy and sediment supply. The present analysis focuses on a dynamic and complex spit at Tortugueros beach, a re-entrant bay, 1 km in length, on the Gulf of Mexico. Tortugueros beach is a wave-dominated beach with very fine to fine sand that forms a fairly gentle sloping beach profile. The sediment sources are longshore sediment transport and onshore sandbar migration, while sediment loss is due to long- and cross shore (during storms) transport. The region is micro-tidal, with mean and maximum high tide levels of 0.18 m and 0.92 m above the mean sea level. Given the high dynamics of the Tortugueros beach spit system and the lack of data measured on the beach, a monitoring system was developed to collect field data regularly to help us improve the understanding of the functioning of the coast on this beach, and the international knowledge related to the formation and morphological evolution of this type of spits in other similar beaches around the world.
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Karlonienė, Dovilė, Donatas Pupienis, Darius Jarmalavičius, Aira Dubikaltinienė, and Gintautas Žilinskas. "The Impact of Coastal Geodynamic Processes on the Distribution of Trace Metal Content in Sandy Beach Sediments, South-Eastern Baltic Sea Coast (Lithuania)." Applied Sciences 11, no. 3 (January 25, 2021): 1106. http://dx.doi.org/10.3390/app11031106.
Sandy coasts are one of the most dynamic spheres; continuously changing due to natural processes (severe weather and rising water levels) and human activities (coastal protection or port construction). Coastal geodynamic processes lead to beach sediment erosion or accumulation. The coast’s dynamic tendencies determine the changes in the volume of beach sediments; grain size; mineralogical; and geochemical composition of sediments. In addition to lithological and mineralogical analysis of sediments, geochemical analysis can provide valuable information about the local and regional patterns of sediment transport, distribution, provenance, and coasts’ conditions. The study aims to assess trace metals’ temporal and spatial distribution determined in the sandy beach sediments along the south-eastern Baltic Sea coast (Lithuania) during 2011–2018. The Lithuanian seacoast is divided into two parts: mainland and spit coast. Our results revealed that the dominant group of elements on the mainland includes Ca–Mg–Mn–Ti and on the Curonian Spit Fe–Pb–As–Co–Cr–Ni–Al, which remain unchanged during the years. The analysis included additional parameters such as beach volume, grain size and sorting, and heavy mineral concentration on the beach. The spatial analysis of trace elements indicated that the trace metal content depends on the coastal processes, but it differs in the mainland and spit sea coast. We identified a higher concentration of trace metals in the erosion-dominated areas in all analysed years on the mainland coast. On the spit coast, the trace metal concentration increased in areas associated with relict coarse sand and where the loading of sediments was active on the beach due to the northward along-shore transport.
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Wahyudi, Vierda Khairene Tiffany, Yeyes Mulyadi, Haryo Dwito Armono, Kriyo Sambodho, Leo Eliasta Sembiring, and Nguyen Trung Viet. "Morpho-dynamic Induced Rip Currents in Klayar Beach, Pacitan, East Java, Indonesia." IOP Conference Series: Earth and Environmental Science 1298, no. 1 (February 1, 2024): 012035. http://dx.doi.org/10.1088/1755-1315/1298/1/012035.
Abstract Klayar Beach (KB), Pacitan, East Java, Indonesia is a rugged coast with a narrow sand beach, a relatively small embayment with rocky headlands, and a very exotic view as a coastal tourism destination. Despite its attractiveness, KB poses a hazard due to rip currents. From 2009 to 2022, KB visited more than 3 million people, and more than 30 people were reported dead due to drowning in rip currents. This paper presents the result of fieldwork to investigate morpho-dynamic driven rip current hazard of the study area. This study carried out bathymetric and topographic mapping and sediment sampling. The last 10 years’ wave data was used for predicting hydrodynamic parameters. The study shows a good correlation between a variety of incoming significant wave heights and tide fluctuation vs. rip current velocity. The existence of headland plays a significant role in rip current formation in the study area. The headland influences either shadow or deflected rip currents formation for the incoming wave angle. The study also indicates that the type of rip current in the KB is structural boundary controlled, and the most important thing to be alerted for promoting beach safety in this area is that this rip current is predicted permanently to occur.
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Nguyen, Minh Quang, Van Ha Vu, Thanh Tan Mai, Xuan Ban To, Ngoc Dien Tran, Minh Tuan Dang, Xuan Tung Dang, Thi Min Nguyen, Van Tha Hoang, and Thi Kim Chi Giap. "Geomorphological sedimentary characteristics in the coastal area of Ma river delta, Thanh Hoa province." Tạp chí Khoa học và Công nghệ Biển 21, no. 3 (September 30, 2021): 283–98. http://dx.doi.org/10.15625/1859-3097/15995.
The coastal area of the Ma river delta is formed by the interaction of continental and marine processes, between neo-tectonic activities and exogenous processes, between natural factors and human activities during the Late Holocene. Using remote sensing and geoscience research methods (granulometry, paleontology, geochemistry, clay mineralogy) and geomorphological studies (geneses, morphology, dynamics) combined with field survey, this coastal area, except the denuded mountainous remnants, could be distinguished into 12 morpho-sedimentary units formed and developed by the dynamic interactions of the river, waves and tides. The units formed by fluvial dynamics include: 1) Point bar is composed of clayey silt and sandy silt, 2) Channel bar composed of silty sand, 3) Levee with the composition of silty sand and 4) The flood plain of silty clay. The Late Holocene evolution of the Ma river delta was dominated by wave dynamics, reflected by a wave-formed association of dunes, interdune swamps and current sand beaches. The wave-formed units include 5) Dune’s sand and silty sand, 6) Back-dune depressions composed of sand silt clay, 7) Beach composed of sand, 8) Lagoon plain of silty clay and 9) Strand plain composed of silty sand. The tide-influenced units include 10) Supratidal flat with the composition of silty clay, 11) Intertidal flat characterized by clay or silty clay interbedded with thin fine sand or silty sand layers, 12) Subtidal flat of sand and silty sand.
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Kinsela, Michael, Chris Owers, Hannah Power, Tom Doyle, and David Hanslow. "MIGRATION AND WELDING OF AN ESTUARINE BARRIER-SPIT DRIVEN BY DELTA EVOLUTION AND STORMS." Coastal Engineering Proceedings, no. 37 (September 1, 2023): 75. http://dx.doi.org/10.9753/icce.v37.sediment.75.
As sea levels rise globally in response to anthropogenic climate change, coastal depositional systems that persist in dynamic equilibrium with accommodation space, sediment supply and hydrodynamic processes may begin to respond by redistributing sediment, causing erosion or migration of landforms that may have appeared as stable over previous decades to centuries. In contrast, systems that have adjusted to inherited or changing boundary conditions over historical times offer insights on the modes and timescales of potential future change in remobilised coastal systems. We investigate the coupled evolution of an estuarine sand barrier-spit and tidal delta over the past century, focusing on storm-driven erosion and overwash during recent decades that triggered recurrent barrier migration (rollover), ultimately welding it to the bedrock valley framework. Historical aerial photographs and recent high-resolution satellite and aerial imagery are analysed to map morphological change and calculate decadal trends in shoreline and barrier migration. Ocean wave and water level conditions between image dates capturing notable responses are analysed using wave and tide records from nearby measurement stations.
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Xiao, Heng, Yin Lu Young, and Jean H. Prévost. "Hydro- and morpho-dynamic modeling of breaking solitary waves over a fine sand beach. Part II: Numerical simulation." Marine Geology 269, no. 3-4 (March 2010): 119–31. http://dx.doi.org/10.1016/j.margeo.2009.12.008.
Dissertations / Theses on the topic "Sand spit morpho dynamic":
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Meslard, Florian. "Apports sableux par les fleuves côtiers méditerranéens et aléa de submersion marine (ASPLEC)." Electronic Thesis or Diss., Perpignan, 2023. http://www.theses.fr/2023PERP0053.
Obtenir des estimations précises des bilans sédimentaires sur le continuum terre-mer et comprendre comment ces bilans affectent la dynamique des littoraux est devenu un enjeu crucial dans le contexte actuel de montée du niveau marin et de recul du trait de côte. Les fleuves côtiers méditerranéens, du fait d’un caractère torrentiel lié à des événements météorologiques intenses, sont caractérisés par des épisodes de crues brefs mais violents durant lesquels la majorité du flux d’eau et de sédiments est apportée à la zone côtière en quelques jours. Ce mode de fonctionnement épisodique impacte également leurs embouchures qui peuvent se retrouver obstruées par le développement de flèche sableuse et conduire durant la concomitance des évènements de tempête et de crue à de fortes submersions en zone littorale.Cette thèse a pour objectif de mieux comprendre le fonctionnement de ces embouchures intermittentes et leurs interactions avec les apports en sédiments des fleuves qui y sont associés selon un continuum terre-mer. Une approche spatio-temporelle multi-échelles (terre-mer) couplant des données d’observations morphologiques, hydro-météorologiques et de suivi du transport sédimentaire a été appliquée sur le fleuve Têt, un exemple de fleuve côtier méditerranéen. Les résultats ont permis de 1) mieux comprendre le fonctionnement de ce système d’embouchure intermittente régie par des processus auto-allocycliques et anthropiques, 2) améliorer les estimations de flux de matières en suspension, apporter les premières estimations de flux de sable en suspension et à proximité du fond ainsi que de comprendre le rôle de la morphologie sur leur transfert vers la zone côtière et 3) améliorer la compréhension des événements concomitants de tempête et de crue sur la dynamique de réponsemorphologique et du transport sédimentaire associé Obtaining accurate estimates of sediment budgets on the land-sea continuum and understanding how these budgets affect coastal dynamics has become a crucial issue in the current context of rising sea levels and retreating coastlines. The torrential nature of mediterranean coastal rivers, linked to intense meteorological events, is characterized by brief but violent flooding episodes, during which most of the water and sediment discharge is delivered to the coastal zone in a few days. This episodic behavior of operation also has an impact on their river outlet as well, which can become obstructed by the development of sandy spits, leading to heavy flooding in coastal areas during concomitant storm and flood events. The aim of this thesis is to improve our understanding of intermittent river mouths processes, and to assess their interaction with the sediment transport in a land-sea continuum. A multi-scales (land-sea) spatio-temporal approach combining morphological, hydro-meteorological and sediment transport monitoring data was applied to the Têt River, an example of a mediterranean coastal river. The results provided with 1) a better understanding of the mechanisms at this intermittent river mouth system governed by auto-allocyclic and anthropogenic processes, 2) an improved estimates of suspended solids fluxes, provided by the first estimates of suspended and near-bottom sand fluxes, as well as understanding the role of morphology on their transfer to the coastal zone, and 3) an improved understanding of concomitant storm and flood events on the dynamics of the morphological response and the associated sediment transport
Conference papers on the topic "Sand spit morpho dynamic":
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Dorokhova, Evgenia, Evgenia Dorokhova, Dmitry Dorokhov, and Dmitry Dorokhov. "SEDIMENT MAPPING AND TRANSPORT PATHWAYS IN THE NEARSHORE ZONE OF THE RUSSIAN PART OF THE SOUTH-EASTERN BALTIC SEA." In Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.31519/conferencearticle_5b1b9489e8deb2.41910928.
To achieve a more robust interpretation of sediment conditions and transport, our study combines the two different interpretation techniques. A side-scan sonar survey was used as a basis for detail sedimentological investigation. Grain-size analyses of grab samples provided sediment transport direction and decoding of sonar data. The new detail lithological map of the underwater shore slope of the northern Sambian peninsula and the Russian part of the Curonian spit in 1:50 000 scale is created. For the first time, the stretched zone of very fine sands is outlined at depths of 25-30 m of the Curonian spit underwater slope. These sands are relicts, and their formation is connected with accumulative processes on the ancient shores of the Baltic Sea. Separate morpho-lithodynamic cells are distinguished on the submarine slope of the northern Sambian peninsula coast up to a depth of 20 m. The cape areas of the Sambian peninsula serve as cell boundaries where a divergence of sediment trend and seabed erosion are observed. The convergence of sediment transport directions is confined to the bight’s central parts. Fine and very fine-grained sand accumulation prevails here.
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Dorokhova, Evgenia, Evgenia Dorokhova, Dmitry Dorokhov, and Dmitry Dorokhov. "SEDIMENT MAPPING AND TRANSPORT PATHWAYS IN THE NEARSHORE ZONE OF THE RUSSIAN PART OF THE SOUTH-EASTERN BALTIC SEA." In Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.21610/conferencearticle_58b43152071d3.
To achieve a more robust interpretation of sediment conditions and transport, our study combines the two different interpretation techniques. A side-scan sonar survey was used as a basis for detail sedimentological investigation. Grain-size analyses of grab samples provided sediment transport direction and decoding of sonar data. The new detail lithological map of the underwater shore slope of the northern Sambian peninsula and the Russian part of the Curonian spit in 1:50 000 scale is created. For the first time, the stretched zone of very fine sands is outlined at depths of 25-30 m of the Curonian spit underwater slope. These sands are relicts, and their formation is connected with accumulative processes on the ancient shores of the Baltic Sea. Separate morpho-lithodynamic cells are distinguished on the submarine slope of the northern Sambian peninsula coast up to a depth of 20 m. The cape areas of the Sambian peninsula serve as cell boundaries where a divergence of sediment trend and seabed erosion are observed. The convergence of sediment transport directions is confined to the bight’s central parts. Fine and very fine-grained sand accumulation prevails here.
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TAKAGAWA, TOMOHIRO, YOSHIMITSU TAJIMA, HAIJIANG LIU, SATOSHI TAKEWAKA, and SHINJI SATO. "DYNAMIC TOPOGRAPHY CHANGES OF SAND SPIT OF THE TENRYU RIVER MOUTH DUE TO OVERTOPPING WAVES." In The Proceedings of the Coastal Sediments 2011. World Scientific Publishing Company, 2011. http://dx.doi.org/10.1142/9789814355537_0092.
Fomin, Vladimir, Vladimir Fomin, Ludmila Kharitonova, Ludmila Kharitonova, Dmitrii Alekseev, Dmitrii Alekseev, Elena Ivancha, and Elena Ivancha. "MORPHODYNAMICS OF THE BAKALSKAYA SPIT OF THE BLACK SEA." In Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.31519/conferencearticle_5b1b93fae199c8.45419382.
Studies of shape dynamics of the Bakalskaya Spit based on observation and numerical simulation are carries out. The Bakalskaya Spit is a dynamically active sand formation on the north-west coast of the Crimea Peninsula. Field observations and satellite image analyses showed that the erosion of spit west coast, eastward displacement of spit distal part and separation of distal part from the spit main part are the most significant processes. After the autumn storms in 2010 the isthmus between the distal part of spit and its main part was eroded and had not recovered till now. So the distal part of the Bakalskaya Spit turned into island. Dynamic of sediments depends on wind wave parameters and sea level oscillations. Effect of changing of wind wave direction and storm surge height on erosion and deposition processes in the Bakalskaya Spit region of the Black Sea is studied by using of XBeach numerical model. Dependencies of location and space dimension of erosion and deposition areas of sediments on characteristics of waves and surges are obtained. It is found that the most intensive erosion of spit isthmus occurs in case of wave running from the west in comparison of cases of wave running from the south-west and north-west if there are no surges. Presence of surges may results in increasing or decreasing of erosion process intensiveness depending on wave direction.
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Fomin, Vladimir, Vladimir Fomin, Ludmila Kharitonova, Ludmila Kharitonova, Dmitrii Alekseev, Dmitrii Alekseev, Elena Ivancha, and Elena Ivancha. "MORPHODYNAMICS OF THE BAKALSKAYA SPIT OF THE BLACK SEA." In Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.21610/conferencearticle_58b431521aa58.
Studies of shape dynamics of the Bakalskaya Spit based on observation and numerical simulation are carries out. The Bakalskaya Spit is a dynamically active sand formation on the north-west coast of the Crimea Peninsula. Field observations and satellite image analyses showed that the erosion of spit west coast, eastward displacement of spit distal part and separation of distal part from the spit main part are the most significant processes. After the autumn storms in 2010 the isthmus between the distal part of spit and its main part was eroded and had not recovered till now. So the distal part of the Bakalskaya Spit turned into island. Dynamic of sediments depends on wind wave parameters and sea level oscillations. Effect of changing of wind wave direction and storm surge height on erosion and deposition processes in the Bakalskaya Spit region of the Black Sea is studied by using of XBeach numerical model. Dependencies of location and space dimension of erosion and deposition areas of sediments on characteristics of waves and surges are obtained. It is found that the most intensive erosion of spit isthmus occurs in case of wave running from the west in comparison of cases of wave running from the south-west and north-west if there are no surges. Presence of surges may results in increasing or decreasing of erosion process intensiveness depending on wave direction.
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Babakov, Alexander, Alexander Babakov, Boris Chubarenko, and Boris Chubarenko. "SEDIMENT TRANSPORT NEAR THE VISTULA SPIT (BALTIC SEA)." In Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.31519/conferencearticle_5b1b93751e4b25.42106675.
The Vistula Spit is a sandy elongated barrier form which borders the Vistula Lagoon from the Baltic Sea. The evolution of the spit as well as nowadays sediment transport along the marine shore of it are still under discussion, especially due to existing of entrance jetties bordered the Strait of Baltiysk, the single inlet to the Vistula Lagoon, and advanced up to 10 m depth seaward. Different hypothesizes about ether uniform transport from north to south or contrary directed fluxes with convergence at various points at the spit shore are discussed. Most of them are based on fact of accumulation of sandy material just to north from the northern entrance jetty as in incoming corner. Basing on statistics of near-surface wind, direct measurements of currents and analysis of direction of the scour hole located between jetties the paper confirms the existence of two opposite fluxes - one brings alluvium from the Vistula River mouth to north as main winds blow from south-west and west, and, in contrast, another one brings material obtained by erosion of the western shore of the Sambian Peninsula to south. Dynamic equilibrium between these fluxes through hundreds of years resulted in formation of present shape of the coastline, and it is expected that the area of the equilibrium in alongshore migrations is in the top of the Yantarny- Baltiysk concave. Appearance of entrance jetties of the Vistula Lagoon inlet, in the area where opposite alongshore migration of material are nearly equalised, leaded to the accretion-erosion pattern, which is pseudo equal to sediment transport from north to south. In fact the accumulation of sand just to north from the northern entrance jetty and erosion to south from southern jetty may be explained by mechanism, when the sand transported in the incoming corner just near the northern mole by southward migrations is excluded from migratory movement and deposited in the zone shadowed by jetties (from northward migrations). Erosion to south of jetties is explained by wind surges in incoming corner for prevailing western winds.
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Babakov, Alexander, Alexander Babakov, Boris Chubarenko, and Boris Chubarenko. "SEDIMENT TRANSPORT NEAR THE VISTULA SPIT (BALTIC SEA)." In Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.21610/conferencearticle_58b4315e36e45.
The Vistula Spit is a sandy elongated barrier form which borders the Vistula Lagoon from the Baltic Sea. The evolution of the spit as well as nowadays sediment transport along the marine shore of it are still under discussion, especially due to existing of entrance jetties bordered the Strait of Baltiysk, the single inlet to the Vistula Lagoon, and advanced up to 10 m depth seaward. Different hypothesizes about ether uniform transport from north to south or contrary directed fluxes with convergence at various points at the spit shore are discussed. Most of them are based on fact of accumulation of sandy material just to north from the northern entrance jetty as in incoming corner. Basing on statistics of near-surface wind, direct measurements of currents and analysis of direction of the scour hole located between jetties the paper confirms the existence of two opposite fluxes - one brings alluvium from the Vistula River mouth to north as main winds blow from south-west and west, and, in contrast, another one brings material obtained by erosion of the western shore of the Sambian Peninsula to south. Dynamic equilibrium between these fluxes through hundreds of years resulted in formation of present shape of the coastline, and it is expected that the area of the equilibrium in alongshore migrations is in the top of the Yantarny- Baltiysk concave. Appearance of entrance jetties of the Vistula Lagoon inlet, in the area where opposite alongshore migration of material are nearly equalised, leaded to the accretion-erosion pattern, which is pseudo equal to sediment transport from north to south. In fact the accumulation of sand just to north from the northern entrance jetty and erosion to south from southern jetty may be explained by mechanism, when the sand transported in the incoming corner just near the northern mole by southward migrations is excluded from migratory movement and deposited in the zone shadowed by jetties (from northward migrations). Erosion to south of jetties is explained by wind surges in incoming corner for prevailing western winds.
