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Quantitative Estimates of Bio-Remodeling on Coastal Rock Surfaces

Author(s)
Pappalardo, Marta; Chelli, Alessandro; Cironi, Luca; Pannacciulli, Federica; Buehler, Markus J; Qin, Zhao; ... Show more Show less
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Abstract
Remodeling of rocky coasts and erosion rates have been widely studied in past years, but not all the involved processes acting over rocks surface have been quantitatively evaluated yet. The first goal of this paper is to revise the different methodologies employed in the quantification of the effect of biotic agents on rocks exposed to coastal morphologic agents, comparing their efficiency. Secondly, we focus on geological methods to assess and quantify bio-remodeling, presenting some case studies in an area of the Mediterranean Sea in which different geological methods, inspired from the revised literature, have been tested in order to provide a quantitative assessment of the effects some biological covers exert over rocky platforms in tidal and supra-tidal environments. In particular, different experimental designs based on Schmidt hammer test results have been applied in order to estimate rock hardness related to different orders of littoral platforms and the bio-erosive/bio-protective role of <i>Chthamalus</i> ssp. and <i>Verrucariaadriatica</i>. All data collected have been analyzed using statistical tests to evaluate the significance of the measures and methodologies. The effectiveness of this approach is analyzed, and its limits are highlighted. In order to overcome the latter, a strategy combining geological and experimental–computational approaches is proposed, potentially capable of revealing novel clues on bio-erosion dynamics. An experimental-computational proposal, to assess the indirect effects of the biofilm coverage of rocky shores, is presented in this paper, focusing on the shear forces exerted during hydration-dehydration cycles. The results of computational modeling can be compared to experimental evidence, from nanoscopic to macroscopic scales. Keywords: bioerosion; bioprotection; rocky coasts; rock hardness; materials science; computational modeling; geomorphology
Date issued
2016-05
URI
http://hdl.handle.net/1721.1/113360
Department
Massachusetts Institute of Technology. Department of Civil and Environmental Engineering
Journal
Journal of Marine Science and Engineering
Publisher
MDPI AG
Citation
Pappalardo, Marta et al. "Quantitative Estimates of Bio-Remodeling on Coastal Rock Surfaces." Journal of Marine Science and Engineering 4, 2( May 2016): 37 © 2016 The Author(s)
Version: Final published version
ISSN
2077-1312

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