Analysis on morphodynamics of sandy beaches in South China
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Keywords:
Beach morphodynamics
Coastal geography
Plage
Marine transgression
Beach ridge
Topics:
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Landform
Sea coast
BENGAL
East coast
Coastal geography
West coast
Shoal
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Coastal erosion
Beach morphodynamics
Sedimentary budget
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Concern over loss of shore property and local deterioration of the physical condition of beaches on the west coast of Barbados has led to extended analysis of the coastal subsystems. The main features of the west coast are inherited from events associated with complex sea-level fluctuations and extension of coral terraces in the Quaternary. The contemporary coast was established at the close of the Flandrian transgression along an early Wisconsin rocky shoreline. Introduction of sand into the shore system from cliff erosion (2 to 10 m retreat during the period), reef destruction and terrestrial sources has formed a sand beach that has moved seawards with time leaving a narrow sand terrace between the shore and the earlier coastline. Nineteen beach cells were identified along the west coast and intensive studies of wave and current processes leading to changes in beach planform and profile were made at two (Gibbs and Sandy Lane bays). Whilst the volume-shape mechanism operating through an annual cycle leaves a beach cell in quasi-equilibrium, overall loss of beach sand in the past 13 years has been accompanied by a 45 % linear increase of exposed beach rock.
Cliff
Marine transgression
Coastal erosion
Terrace (agriculture)
Beach nourishment
West coast
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Coastal plain
Coastal erosion
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Types of beach morphodynamics are divided for the typical beaches along the northern and eastern coasts of Shandong Peninsula based on beach-flat forms,wave-sediment parameters(Dean parameters) and five repeated beach profile surveys carried out from 2003 to 2006.Relationships between the beach morphodynamical types and the wave conditions are also discussed by comparing the differences in seasonal changes of beach profiles in the north with those in the east.The results show that: 1) according to the wave-sediment parameters,which are indicative of division of beach morphodynamical types in the studied areas,the beaches along the northern coast of the peninsula are dominated by a dissipative type and a transition type,whereas along the eastern coast of the peninsula the beaches are mainly composed of a transition type and a reflective type;2) the forms of beach bars and beach profiles indicate that the beaches along the northern coast of the peninsula have a changing tendency opposite to those along the eastern coast of the peninsula in summer and winter,with the beach bars occurring frequenctly on the former profiles in summer and on the latter profiles in winter due to small waves;3) although the northeastern coast of the peninsula is mostly subjected to the actions of waves and tides at the same time,the seasonal changes in wave conditions have played an more important role to the beach morphodynamics of the beaches.
Beach morphodynamics
Peninsula
Plage
Breakwater
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Swell
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Del Río, L., Gracia, F.J. and Benavente, J., 2013. Morphological and evolutionary classification of sandy beaches in Cadiz coast (SW Spain).Sandy beaches are extremely dynamic systems, so gaining insight about decadal patterns of beach change is essential for the adequate management of risks affecting coastal zones. This work aims at improving understanding of the factors that control erosion-accretion processes and evolution of sandy beaches at the intermediate time scale. For this purpose, recent evolution of beaches along the 150 km long Atlantic coast of Cadiz (SW Spain) is investigated in relation to their morphology and dynamics. Dune toe and high water line changes are assessed based on georectified aerial photographs from 1956–2008, using GIS tools. Results show considerable spatial and temporal variability of recent shoreline changes along the study area, with mostly eroding trends along the northern sector and a predominantly stable southern sector. Important exceptions at certain points are related to the heterogeneity of the coast and the diverse natural and anthropogenic factors contributing to shoreline change in the area. A classification of the studied beaches is proposed, based on beach morphology and dynamics, thus helping to understand the way coastal morphological characteristics influence erosion-accretion trends. Rectilinear beaches are predominantly stable or accreting, whereas reef-supported beaches are mostly erosive. Z-bays generally experience erosion at one end and accretion at the opposite end, greatly influenced by local conditions. Enclosed beaches are stable where sediment budget remains unchanged, but rapidly erode or accrete if human interventions alter the balance. The classification allows identifying those beaches which are most sensitive to variations in controlling factors, such as sediment supply.
Coastal erosion
Progradation
Plage
Sedimentary budget
Beach nourishment
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A coastal classification based on Shepard's primary and secondary coasts and Bloom's diagram combining variations in physical processes and emergence or submergence with time, results in the following classification of the Norwegian coast: strandflat -, fjord -, fjärd -, cliff abrasion -, flat abrasion -, and moraine topography coast, all primary coasts, and moraine cliff -, and sandy beach coast, both secondary coasts. The explanatory description of the coastal types is a coastal classification of 3rd order. Gently sloping ice-smoothed rocky shores, steeply sloping ice-smoothed rocky shores, abrasion shores, stoney beaches and sandy beaches arc the shore-zone types along the coast of Norway.
Cliff
Rocky shore
Fjord
Abrasion (mechanical)
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Landform
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Rodríguez Paneque, R. and Finkl, C.W., 2020. Erosion of carbonate beaches on the northeastern coast of Cuba. Journal of Coastal Research, 36(2), 339–352. Coconut Creek (Florida), ISSN 0749-0208.Beaches on the northeastern coast of Cuba have made this area one of the most important tourist destinations in the Caribbean, despite the fact that many beaches are visibly eroded. In this study, the causes and magnitude of coastal erosion on the northeastern coast of Cuba were evaluated using the Digital Shoreline Analysis System (DSAS 4.3) application, satellite images, and beach profiles. Time frames between 7 and 14 years were considered from 2003 to 2017 using satellite images and between 11 and 18 years using beach profiles. Results of this investigation showed that 56% of northeastern coast beaches tend to erode at a rate of less than 1.2 m/y. An increase in the recurrence of extreme events (hurricanes and tropical storms) during the last 39 years induced more beach erosion. It was furthermore observed that El Niño–Southern Oscillation events enhanced the sedimentary balance of the beaches by returning sand volumes that were transported in a westerly direction to their original shoreline locations. Possibly due to sea-level rise, which may be occurring in response to global warming, beaches on the northeast coast will retreat on average about 0.17 m/y. At this rate of shoreline recession, by the end of the twenty-first century, 14% of the beaches on this littoral will be lost, and the width of 27% of the other beaches will be significantly reduced.
Coastal erosion
Beach nourishment
Beach ridge
Longshore drift
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