Clastic sedimentary features of beachrocks and their palaeo-environmental significance:comparison of past and modern coastal regimes   总被引：1，自引：0，他引：1  

David PSOMIADIS  Konstantinos ALBANAKIS  Nikoleta ZISI  Matthieu GHILARDI  Elissavet DOTSIKA 《国际泥沙研究》2014,29(2):260-268

Clastic sedimentary features of beachrocks and unconsolidated deposits of parent beaches were investigated along the northern Aegean coastline（Greece） to assess their suitability in palaeo-environmental reconstruction.Twelve paired datasets were collected in the Thermaikos,Toroneos,Siggitikos and lerissos gulfs of the Chalkidiki Peninsula,the adjoining Kavala Gulf and Thassos Island,comprising beachrock cores and companion beach subsurface sediments.Particle size analyses based on univariate and bivariate statistics suggest that,during the time period of beachrock formation,depositional conditions differed distinctly from those of the modern parent beaches.The results imply difference of maturity level of beach evolution from the time of cementation（coarser materials-early stage of beach formation） to modern situation（finer materials-reworked and ’mature’ beach sediments）.Furthermore,the findings indicate increasing coastal protection due to beachrock exposure in the modern swash zone.In conclusion,it is suggested that textural analysis of beachrocks in comparison with unconsolidated sediments of the parent beach might provide information regarding differences of coastal depositional regimes and future research could focus on specific-layer analysis and comparison.  相似文献   

Reconstruction of the paleo-coastline of Santorini island (Greece), after the 1613 BC volcanic eruption: A GIS-based quantitative methodology     

DIMITRIOS OIKONOMIDIS  KONSTANTINOS ALBANAKIS  SPYRIDON PAVLIDES  MICHAEL FYTIKAS 《Journal of Earth System Science》2016,125(1):1-11

A catastrophic volcanic explosion took place in Thera/Santorini island around 1613 BC, known as the ‘Minoan’ eruption. Many papers have dealt with the shape of the shoreline of the island before the eruption, but none with the shape of the shoreline exactly after it, assuming that it would be the same with the contemporary one. However, this is not correct due to the wave erosion. In this paper, a new DEM was constructed, covering both land and submarine morphology, then topographic sections were drawn around the island. Using these sections, the ‘missing parts’ (sea-wave erosion) were calculated, the shoreline was reconstructed as it was one day after the eruption and finally the erosion rate was calculated.  相似文献