IMPAct de Vagues sur un mur vertical : IMPAV (2019)
Impact of waves on a vertical wall
The objective of the project (MRIF, Québec-Kyoto cooperation) is to study the feasibility of electrical production by wave-powered devices enabling the alert or emergency services to be supplied, even in the event of an electrical failure following a marine submersion or a tsunami.
Firstly, The study of wave impact forces will be studied to estimate the natural resources available. The database obtained at INRS on a quasi-real scale will be re-analyzed.
On the other hand, an assessment of the required energies will be carried out for different crisis management solutions
SImulations Numériques Appliquées à la Physique SEdimentaire – SINAPSE (2018-2020)
Digital simulation applied to sedimentary physics
The main objective of the SINAPSE proposal ‘Digital simulations applied to sedimentary physics’ is to better understand the technical and scientific obstacles that prevent the emergence of operational tools for predicting sediment transport and morphodynamic changes.
The aim is to validate or improve the simulation tools on heavily instrumented experimental configurations (CT-Scan and high résolution PIV)
Loi d’Érosion et de Consolidation de sédiments COHésifs : ECCOH (2018-2023)
Cohesive sediment erosion and consolidation law
Project funded by the Natural Sciences and Engineering research council of Canada
- Formation and erosion of cohesive sedimentary deposits.
- Fixation and release of pollutants during transport.
Part 2 : Role of porosity-saturation in the erosion of banks and beaches.
- Role of porosity-cohesion in the bank collapse process.
- Role of drainage on the wave run-up.
Part 3 : Soft solutions to control erosion
- Redirection of sediment flows.
- Reduction-attenuation of wave energy.
Project funded bu Laval University and the Interdisciplinary Center for Ocean Cartography Development
CIDCO has developed a Hydroball tool for measuring tides and waves. The smart buoy is 40cm diameter for 13kg. It communicates by a GNSS receiver and antenna.
In order to improve the quality of the measurements, test and extend the conditions of use of the new device, tests in large hydraulic channel were carried out.
The buoy was tested for different wave conditions. The measurement uncertainties were determined and reduced later.
Modeling wave impact on a vertical wall
Funding: Ministère des Transports du Québec
Many areas in Quebec are affected by coastal erosion. Although a natural phenomenon, erosion is currently on the rise because of climate change. The impacts of climate change include rising sea levels, shifting wave and ice patterns, and changes in the occurrence of extreme meteorological events. These impacts can cause considerable damage to roads and other coastal infrastructure. For example, waves can destabilize protective walls and cause partial or total collapse. .
The research project seeked a better understanding of the design of coastal protection structures and to ensure the sustainability of the walls protecting coastal roads in the context of climate change. More specifically, the objectives are to:
- Determine the impact of breaking waves on a vertical wall, taking into account the overpressure caused by air trapped by wave surges of different wave types, heights, and periods.
- Determine the crossing coefficient of water projected by waves of different types.
The project consisted of scientific studies and simulations using small-scale physical models to reproduce natural conditions. The Chair’s team used the wave flume and other tools to simulate the impacts of rising sea levels and increased wave height on vertical walls. This work allowed researchers to analyze different nearshore hydrodynamic conditions, which in turn will allow them to evaluate the forces applied to walls, the flows required for wave crossing, and the consequences of these phenomena on coastal infrastructure. The knowledge gained will help us adapt the design of protective walls for the new conditions created by climate change.
Wave flume modeling of a beach profile for beach nourishment
Funding: Ministère de la Sécurité publique du Québec
A lot of the infrastructure and buildings located along the St. Lawrence shorelines are affected by erosion and coastal flooding. Despite the shoreline protection measures in place, some structures are still affected when storm surges and large waves lead to very high water levels. For example, a wall built above a beach was affected by scouring during a recent storm, and beach nourishment was the solution selected to remediate the problem. This project will serve as a real-world case study for modeling experiments in the wave flume.
The objectives of this project were to:
- Determine the changes in a beach’s profile of equilibrium when subjected to storm waves
- Study the morphodynamics of the sediments replaced to test the stability of the proposed beach profile of equilibrium
- Examine the cross-shore sediment transport at intermediate depths
Scientific studies and simulations using reduced-scale physical models were carried out in the wave flume to determine the changes in the slope of a beach composed of a mixture of sand and gravel when subjected to storm surges. The flume experiments were carried out long enough for researchers to estimate the time required for waves to sort the sediment and form a protective berm at the base of the retaining wall. Small scale modeling of a beach enableb coastal engineers to improve the beach replenishment methods used in Quebec and develop more sustainable protection measures for coastal communities.