THREE DIMENSIONAL METHOD FOR MONITORING DAMAGE TO DOLOS BREAKWATERS
No. 35 (2016), Coastal Structures
No. 35 (2016)

THREE DIMENSIONAL METHOD FOR MONITORING DAMAGE TO DOLOS BREAKWATERS

Coastal Structures
https://doi.org/10.9753/icce.v35.structures.48
Published 2017-06-23
Kishan Tulsi
WML Marine, South Africa www.wmlcoast.co.za
Koos Schoonees
Department of Civil Engineering, Stellenbosch University, Private Bag X1, Matieland, 7602, South Africa
Magenthran Ruthenavelu
Transnet National Ports Authority (TNPA) Room 703, TNPA House South Arm Road CAPE TOWN, 8000
Gregory Davids
Built Environment, Council for Scientific and Industrial Research, P.O. Box 320, Stellenbosch, 7599, South Africa
Robert Vonk
Built Environment, Council for Scientific and Industrial Research, P.O. Box 320, Stellenbosch, 7599, South Africa
Francios Stroh
Geo-solutions, Horts Solutions, 44 Hiddingh Road, Bergvliet, Cape Town, 7945, South Africa
Nic Herrington
Engineering Survey Department, CIVOC Engineering Services, P.O. Box 31600, Tokai, 7974, South Africa
ICCE 2016 Cover Image
PDF

Keywords

rubble-mound breakwater damage monitoring
LIDAR multi-beam
turbulence modeling

How to Cite

Tulsi, K., Schoonees, K., Ruthenavelu, M., Davids, G., Vonk, R., Stroh, F., & Herrington, N. (2017). THREE DIMENSIONAL METHOD FOR MONITORING DAMAGE TO DOLOS BREAKWATERS. Coastal Engineering Proceedings, 1(35), structures.48. https://doi.org/10.9753/icce.v35.structures.48
ACM ACS APA ABNT Chicago Harvard IEEE MLA Turabian Vancouver

Download Citation

Endnote/Zotero/Mendeley (RIS) BibTeX

Abstract

In order to extend the design life of breakwaters, regular damage investigations and timeous repairs are required. One of the important aspects is calculating the severity of damage to breakwaters. Traditionally, breakwater inspection has been done using aerial photographs and underwater imaging to accomplish these investigations. Breakwaters are systematically divided into inspection stations and photographs are taken to inspect and assess the damage. The photographs are then visually compared with the previous inspection photographs to identify changes. This is difficult to achieve as it is not always possible to get the helicopter exactly in the same position on every survey and highly dependent on the skill of the helicopter pilot. Another difficulty is taking underwater images near the breakwater due to poor visibility and wave breaking. The objective of this study is to test a 3D analysis method by evaluating the accuracy of using the LIDAR and multi-beam echo sounder data to quantify damage to dolos breakwaters above and below the water surface (including the inter-tidal zone). Thus, this comparison is aimed towards the development of the 3D eroded volume method (3D method).
https://doi.org/10.9753/icce.v35.structures.48
PDF

References

Broderick, L., 1982. 'Rip-rap stability scale effects', pp. 82-3.

Burcharth, H., D'Angremond, K., van der Meer, J. and Liu, Z., 2000. 'Empirical formula for breakage of dolosse and tetrapods', Coastal Engineering 40(3), 183-206.

Holtzhausen, A., Retief, G. d. F. and Zwamborn, J. A., 2000. Physical Modelling of Dolos Breakwaters: The Coega Results and Historical Perspective, in 'Coastal Engineering 2000', pp. 1536-1549.

Phelp, D. and Tulsi, K., 2006. Digital image technology as a measurement tool in physical models, in 'International Conference on the Application of Physical Modelling in Coastal and Port Engineering and Science', pp. 21-31.

Phelp, D. and Zwamborn, J., 2000. 'Correlation between model and prototype damage of dolos breakwater armouring', Coastal Engineering 2000 pp. 1-13.

URL: http://ascelibrary.org/doi/abs/10.1061/40549(276)120

RIEGL, 2012. '3D Terrestrial Laser Scanner, RIEGL VZ-400 / RIEGL VZ-1000'.

Thies, T., 2011. A Vessel-Based mobile mapping system from sensor integration to multipurpose products, PhD thesis, University Hamburg, Germany.

URL: http://www.riegl.com/uploads/tx pxpriegldownloads/Thies Thomas 2011, A Vessel-Based Mobile Mapping System Master Thesis HafenCity University, Hamburg Germany part1.pdf

Tulsi, K. and Phelp, D., 2009. Monitoring and maintenance of breakwaters which protect port entrances, in '28th Annual Southern African Transport Conference', number July, pp. 317-325.

URL: http://hdl.handle.net/2263/12016

USACE, 2006. [CEM] Engineer Manual, in W. CHL-ERDC, ed., 'Coastal engineering manual', Vicksburg,MS, pp. 1110-2-1100.

Van der Meer, J. W., 1988. Rock slopes and gravel beaches under wave attack, PhD thesis, Delft Hydrulics Laboratory, Emmeloord, The Netherlands.

Authors retain copyright and grant the Proceedings right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this Proceedings.