Photogrammetric analysis of rubble mound breakwaters scale model tests

Rute Lemos; Maria A. R. Loja; João Rodrigues; José A. Rodrigues; Rute Lemos; Maria A. R. Loja; João Rodrigues; José A. Rodrigues

doi:10.3934/environsci.2016.3.541

AIMS Environmental Science

2016, Volume 3, Issue 3: 541-559. doi: 10.3934/environsci.2016.3.541

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Research article

Photogrammetric analysis of rubble mound breakwaters scale model tests

1.
LNEC, Laboratório Nacional de Engenharia Civil, Núcleo de Portos e Estruturas Marítimas, Av. do Brasil 101, 1700-066 Lisboa, Portugal
2.
LAETA, IDMEC, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1,1049-001 Lisboa, Portugal
3.
ADEC-ISEL, IPL - Instituto Superior de Engenharia de Lisboa Av. Conselheiro Emídio Navarro, 1,1959-007 Lisboa, Portugal
4.
ADM-ISEL, IPL - Instituto Superior de Engenharia de Lisboa Av. Conselheiro Emídio Navarro, 1,1959-007 Lisboa, Portugal
5.
GI-MOSM, Grupo de Investigacção em Modelacção e Optimizac¸ ão de Sistemas MultifuncionaisISEL, IPL - Instituto Superior de Engenharia de Lisboa Av. Conselheiro Emídio Navarro, 1,1959-007 Lisboa, Portugal

Received: 16 March 2016 Accepted: 22 August 2016 Published: 02 September 2016

The main goal of this paper is to develop a photogrammetric method in order to obtain arobust tool for damage assessment and quantification of rubble-mound armour layers during physicalscale model tests. With the present work, an innovative approach based on a reduced number ofdigital photos is proposed to support the identification of affected areas. This work considers twosimple digital photographs recording the instants before and after the completion of the physicaltest. Mathematical techniques were considered in the development of the procedures, enabling thetracking of image differences between photos. The procedures were developed using an open-sourceapplication, Scilab, nevertheless they are not platform dependent. The procedures developed enablethe location and identity of eroded areas in the breakwater armour layer, as well as the possibilityof quantifying them. This ability is confirmed through the calculation of correlation coefficients ineach step of the search for the more damaged area. It is also possible to make an assessment of themovement of armour layer units.
- Rubble-mound breakwaters,
- photogrammetric analysis,
- scale model tests
Citation: Rute Lemos, Maria A. R. Loja, João Rodrigues, José A. Rodrigues. Photogrammetric analysis of rubble mound breakwaters scale model tests[J]. AIMS Environmental Science, 2016, 3(3): 541-559. doi: 10.3934/environsci.2016.3.541

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Abstract

The main goal of this paper is to develop a photogrammetric method in order to obtain arobust tool for damage assessment and quantification of rubble-mound armour layers during physicalscale model tests. With the present work, an innovative approach based on a reduced number ofdigital photos is proposed to support the identification of affected areas. This work considers twosimple digital photographs recording the instants before and after the completion of the physicaltest. Mathematical techniques were considered in the development of the procedures, enabling thetracking of image differences between photos. The procedures were developed using an open-sourceapplication, Scilab, nevertheless they are not platform dependent. The procedures developed enablethe location and identity of eroded areas in the breakwater armour layer, as well as the possibilityof quantifying them. This ability is confirmed through the calculation of correlation coefficients ineach step of the search for the more damaged area. It is also possible to make an assessment of themovement of armour layer units.

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