BIBLIOS

Document type
Conference papers

Document subtype
Abstract

Title
Integration of Image Processing Tools for Monitoring Breakwaters Models

Participants in the publication
Soares, F (Author)
Dep. Engenharia Geográfica, Geofísica e Energia
Henriques, MJ (Author)
LABORATÓRIO NACIONAL DE ENGENHARIA CIVIL
Braz, N (Author)
LABORATÓRIO NACIONAL DE ENGENHARIA CIVIL

Summary
The protection of ports in coastal areas exposed to the action of the sea is carried by sea hydraulic structures (breakwaters) which are exposed to the influence of sea waves. The monitoring of the surface plates movement, constituting the protective mantle and the superstructure (concrete structure) is made by visual comparison of images obtained during follow-up visits. No quantification of these shifts is yet performed. In the design phase of a port protection structure, models are built to study the effect of waves on the protection blocks. During the testing phase waves are generated and periodically are measured the effects of waves in the model.\nPresently, photogrammetric monitoring of the model ports is being held, including the use of orthophotos and point clouds to measure displacements of protection blocks. With these methods there were obtained results of the change in overall topography of the model structure. However the real 3D motion of each block is indeterminate due to the absence of data on the geometry of the blocks. The extraction of these geometric data from the images, along with the spatial data of the point cloud, will deepen knowledge of the intended movement.\nThis work presents an alternative monitoring solution based on image segmentation in order to obtain displacements of the model protection blocks so to monitor its development over time. Time sequence orthogonal images were obtained during the action of blocks movement. In this study, blocks are identified in the image and shifts are quantified. Validation is held by crossing image segmentation results with point clouds data obtained in laboratory by photogrammetric methods at the same moment images were taken. The present study intends to show the positive contribution of image processing techniques for the laboratory monitoring of breakwater models.


Institution
FACULDADE DE CIÊNCIAS DA UNIVERSIDADE DE LISBOA

Event
ESA Living Plane Symposium

Publication Identifiers

Address
Prague, Czech Republic

Organizers
ESA