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shoreline evolution and modern beach sand composition along a coastal stretch of the Tyrrhenian Sea, southern Italy

Journal of Palaeogeography 2021年第2期10卷 222-243页

作者： Consuele Morrone Fabio letto Department of Biology Ecology and Earth Sciences(DiBEST)University of study CalabriaVia P.Buccicubo 15B87036 Arcavacata di RendeCosenzaItalia

This contribution focuses on a multidisciplinary research showing the geomorphological evolution and the beach sand composition of the Tyrrhenian shoreline between Capo Suvero promontory and Gizzeria Lido village(Calabria,southern Italy). The aim of the geomorphological analysis was to reconstruct the evolutionary shoreline stages and the present-day sedimentary dynamics along approximately 6 km of coastline. The results show a general trend of beach nourishment during the period 1870–2019. In this period, the maximum shoreline accretion value was estimated equal to + 900 m with an average rate of + 6.5 m/yr. Moreover, although the general evolutionary trend is characterized by a remarkable accretion, the geomorphological analysis highlighted continuous modifications of the beaches including erosion processes. The continuous beach modifications occurred mainly between 1953 and1983 and were caused mainly by human activity in the coastal areas and inside the hydrographic basins. The beach sand composition allowed an assessment of the mainland petrological sedimentary province and its dispersal pattern of the present coastal dynamics. Petrographic analysis of beach sands identified a lithic metamorphi-clastic petrofacies, characterized by abundant fine-grained schists and phyllites sourced from the crystalline terrains of the Coastal Range front and carried by the Savuto River. The sand is also composed of a mineral assemblage comparable to that of the Amato River provenance. In terms of framework detrital constituents of QFL(quartz:feldspars:aphanitic lithic fragments) and of essential extraclasts, such as granitoid:sedimentary:metamorphic phaneritic rock fragments(Rg:Rs:Rm), sand maturity changes moderately from backshore to shoreface, suggesting that transport processes had a little effect on sand maturity. Moreover, the modal composition suggests that the Capo Suvero promontory does not obstruct longshore sand transport from the north. Indeed, sands displaced by currents driven by storm-wave activity bypass this

关键词： Sandy petrofacies Detrital modes shoreline evolution Capo Suvero Tyrrhenian coast Southern Italy

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NUMERICAL SOLUTION OF shoreline evolution NEAR COASTAL STRUCTURES

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Journal of Hydrodynamics 2003年第4期15卷 63-69页

作者： Cai Ze-wei, Song Xiao-gang, Ye Chun-yang Faculty of Architectural, Civil Engineering and Environment, Ningbo University, Ningbo 315211, China Faculty of Arch. Ningbo Univ. Ningbo 315211 China

Numerical analysis was made for shoreline evolution in the vicinity ofcoastal structures, including spur dike, detached breakwaters. The nonlinear partial differentialequation was derived, and numerical solutions were obtained by the finite difference method. Thenumerical results show good agreement with previous analytical results.

关键词： shoreline evolution numerical solution coastal structures

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海岸线识别偏差:马来西亚登嘉楼州吉隆坡地区中等潮汐海滩的理论值和测量值

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Journal of Marine Science and Application 2022年第3期21卷 184-192页

作者： Faerah Nasir Adina Roslee Junainah Zakaria Effi Helmy Ariffin Nor Aieni Mokhtar Faculty of Science and Marine Environment Universiti Malaysia Terengganu21030Kuala NerusTerengganuMalaysia Institute of Oceanography and Environment Universiti Malaysia Terengganu21030Kuala NerusTerengganuMalaysia

shoreline change analysis frequently begins with feature identification through visual interpretation(proxy-based shoreline)or the intersection of a specific tidal zone(datum-based shoreline).Using proxy-based shoreline information,this study quantifies the distance between proxy-based and datum-based shoreline data,which is defined as the proxydatum bias.The study was conducted at meso-tidal beaches in Kuala Nerus,Terengganu,Malaysia,with morphodynamic responses to northeast and southwest monsoons.The high-water line(HWL)shoreline(proxy-based)was determined using ortho-rectified aerial images captured by an unmanned aerial vehicle(UAV).By contrast,the mean high-water(MHW)shoreline(datum-based)was determined using measured beach profiles adjusted with the Peninsular Malaysia Geodetic Vertical Datum(DTGSM).The theoretical proxy-datum bias was approximated using the best estimate(median)for the beach slope,wave height,and wave period from the estimated total water level(TWL)model.Based on the study,the recorded horizontal proxy-datum bias for the research area was up to 32 m.This study also discovered that the theoretical assumption of the proxy-datum bias based on the TWL model yields values comparable to those of the measurements,with a narrower distinction in bias for steeper beach slopes than the obtained results.The determined proxydatum bias value can benefit future shoreline change studies as it could be incorporated to either proxy-based shorelines by shifting the shoreline seaward or to datum-based shorelines by shifting the shoreline landward in order of the bias value.The seasonal monsoon’s effect on beach profiles should be considered when calculating bias values and conducting potential shoreline change rate studies.

关键词： shoreline evolution Datum Beach profile Unmanned aerial vehicle Monsoon

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Modeling shoreline sand waves on the coasts of Namibia and Angola

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International Journal of Sediment Research 2013年第3期28卷 338-348页

作者： Francesca RIBAS Albert FALQUES Niels VAN DEN BERG Miquel CABALLERIA Department of Applied Physics Universitat Politecnica de CatalunyaSpain

The southwestern（SW） coast of Africa（Namibia and Angola） features long sandy beaches and a wave climate dominated by energetic swells from the Southsouthwest（SSW）,therefore approaching the coast with a very high obliquity.Satellite images reveal that along that coast there are many shoreline sand waves with wavelengths ranging from 2 to 8 km.A more detailed study,including a Fourier analysis of the shoreline position,yields the wavelengths（among this range） with the highest spectral density concentration.Also,it becomes apparent that at least some of the sand waves are dynamically active rather than being controlled by the geological setting.A morphodynamic model is used to test the hypothesis that these sand waves could emerge as free morphodynamic instabilities of the coastline due to the obliquity in wave incidence.It is found that the period of the incident water waves,T;,is crucial to establish the tendency to stability or instability,instability increasing for decreasing period,whilst there is some discrepancy in the observed periods.Model results for T;= 7-8 s clearly show the tendency for the coast to develop free sand waves at about 4 km wavelength within a few years,which migrate to the north at rates of 0.2-0.6 km yr;.For larger T;or steeper profiles,the coast is stable but sand waves originated by other mechanisms can propagate downdrift with little decay.

关键词： shoreline evolution shoreline sand waves High angle wave instability Longshore sediment transport

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