TY - JOUR

T1 - Extended characterization of damage in rubble mound scour protections

AU - Fazeres-Ferradosa, Tiago

AU - Welzel, Mario

AU - Schendel, Alexander

AU - Baelus, Leen

AU - Santos, Paulo Rosa

AU - Pinto, Francisco Taveira

N1 - Funding information: [ This work is supported by the project POCI-01-0145-FEDER-032170 (Oracle project), funded by the European Fund for Regional Development (FEDER) , through the COMPETE2020, the Programa Operacional Competitividade e Internacionalização (POCI) and FCT/MCTES through national funds (PIDDAC). The authors thank all the partners and team members of PROTEUS project, Ghent University, IMDC, HR Wallingford, University of Porto, Leibniz University Hannover and MOW Vlaanderen. The work described in this publication was supported by the European Community's Horizon 2020 Research and Innovation Program through the grant to HYDRALAB-PLUS, Contract no. 654110. The authors deeply acknowledge to Dr. Leen De Vos for the enlightening discussions on damage analysis of scour protections and hereby recognise the importance of her work to the development of the present methodology. Dr. Fazeres-Ferradosa acknowledges Dr. Francisco Fazeres (ULSAM) for opening way to the remarkable wonders of science and research, an opportunity which the author will never be able to repay. This work is supported by the project POCI-01-0145-FEDER-032170 (Oracle project), funded by the European Fund for Regional Development (FEDER), through the COMPETE2020, the Programa Operacional Competitividade e Internacionalização (POCI) and FCT/MCTES through national funds (PIDDAC). The authors thank all the partners and team members of PROTEUS project, Ghent University, IMDC, HR Wallingford, University of Porto, Leibniz University Hannover and MOW Vlaanderen. The work described in this publication was supported by the European Community's Horizon 2020 Research and Innovation Program through the grant to HYDRALAB-PLUS, Contract no. 654110. The authors deeply acknowledge to Dr. Leen De Vos for the enlightening discussions on damage analysis of scour protections and hereby recognise the importance of her work to the development of the present methodology. Dr. Fazeres-Ferradosa acknowledges Dr. Francisco Fazeres (ULSAM) for opening way to the remarkable wonders of science and research, an opportunity which the author will never be able to repay.

PY - 2020/6

Y1 - 2020/6

N2 - The analysis of damage in rubble mound scour protections is crucial for the armour stability assessment. Former methodologies focused on the analysis of the maximum damage number. This work introduces a complementary methodology to determine and characterize damage statistical distribution based on a flexible arrangement of sub-areas. The sub-areas are overlapping and can be varied in size, allowing a refined damage analysis. To capture the variation of damage with changing sub-area layout, the methodology is coupled with a statistical evaluation of damage numbers, which is enabled by the definition of a grid ratio between armour stone size and sub-area size, (Dn50)2/Asub. The methodology is applied to high resolution bathymetric surveys from two stability tests of large-scale rip-rap scour protection around a monopile foundation and combined wave and current loading. Results show that the methodology provides a complementary understanding of damage distribution to the maximum damage acquired from previous methodologies. In addition, it allows a comparison of damage characteristics between tests despite different shapes of the foundation. Research concludes that the size of the sub-areas influences significantly the damage description. Characteristic measures as the maximum damage number and standard deviation become stable at a grid ratio (Dn50)2/Asub equal to 1/4.

AB - The analysis of damage in rubble mound scour protections is crucial for the armour stability assessment. Former methodologies focused on the analysis of the maximum damage number. This work introduces a complementary methodology to determine and characterize damage statistical distribution based on a flexible arrangement of sub-areas. The sub-areas are overlapping and can be varied in size, allowing a refined damage analysis. To capture the variation of damage with changing sub-area layout, the methodology is coupled with a statistical evaluation of damage numbers, which is enabled by the definition of a grid ratio between armour stone size and sub-area size, (Dn50)2/Asub. The methodology is applied to high resolution bathymetric surveys from two stability tests of large-scale rip-rap scour protection around a monopile foundation and combined wave and current loading. Results show that the methodology provides a complementary understanding of damage distribution to the maximum damage acquired from previous methodologies. In addition, it allows a comparison of damage characteristics between tests despite different shapes of the foundation. Research concludes that the size of the sub-areas influences significantly the damage description. Characteristic measures as the maximum damage number and standard deviation become stable at a grid ratio (Dn50)2/Asub equal to 1/4.

UR - http://www.scopus.com/inward/record.url?scp=85080089191&partnerID=8YFLogxK

U2 - 10.1016/j.coastaleng.2020.103671

DO - 10.1016/j.coastaleng.2020.103671

M3 - Article

AN - SCOPUS:85080089191

VL - 158

JO - Coastal engineering

JF - Coastal engineering

SN - 0378-3839

M1 - 103671

ER -