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J. Mar. Sci. Eng. 2016, 4(2), 37; doi:10.3390/jmse4020037

Quantitative Estimates of Bio-Remodeling on Coastal Rock Surfaces

1
Department of Earth Sciences, Pisa University, Pisa 56126, Italy
2
Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139-4307, USA
3
Department of Physics and Earth Sciences “M. Melloni”, Parma University, Parma 43100, Italy
4
Marine Environment Research Centre (ENEA)-Santa Teresa P.O., Pozzuolo di Lerici 19100, Italy
*
Author to whom correspondence should be addressed.
Academic Editor: Gerben Ruessink
Received: 5 March 2016 / Revised: 22 April 2016 / Accepted: 2 May 2016 / Published: 26 May 2016
(This article belongs to the Special Issue Coastal Morphodynamics)
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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 Chthamalus ssp. and Verrucariaadriatica. 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. View Full-Text
Keywords: bioerosion; bioprotection; rocky coasts; rock hardness; materials science; computational modeling; geomorphology bioerosion; bioprotection; rocky coasts; rock hardness; materials science; computational modeling; geomorphology
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Pappalardo, M.; Buehler, M.; Chelli, A.; Cironi, L.; Pannacciulli, F.; Qin, Z. Quantitative Estimates of Bio-Remodeling on Coastal Rock Surfaces. J. Mar. Sci. Eng. 2016, 4, 37.

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