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

作     者：Consuele Morrone Fabio letto Consuele Morrone;Fabio Ietto

作者机构：Department of BiologyEcology and Earth Sciences(DiBEST)University of study CalabriaVia P.Buccicubo 15B87036 Arcavacata di RendeCosenzaItalia 

出 版 物：《Journal of Palaeogeography》 (古地理学报（英文版）)

年 卷 期：2021年第10卷第2期

页      面：222-243页

核心收录：

学科分类：0303[法学-社会学] 0710[理学-生物学] 0709[理学-地质学] 07[理学] 0707[理学-海洋科学] 0708[理学-地球物理学] 0705[理学-地理学] 0815[工学-水利工程] 0813[工学-建筑学] 0833[工学-城乡规划学] 

基　　金：funded by MIUR (Ministero dell’Istruzione  dell’Universitàe della Ricerca) ex 60% fund (2019 year) to Fabio Ietto。 

主　　题：Sandy petrofacies Detrital modes Shoreline evolution Capo Suvero Tyrrhenian coast Southern Italy 

摘      要：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 rocky headland.