Dr Mohsen Ebrahimi presented our paper “SCOUR AND HYDRODYNAMIC EFFECTS OF DEBRIS BLOCKAGE AT MASONRY BRIDGES: INSIGHTS FROM EXPERIMENTAL AND NUMERICAL MODELLING” on 15th of August at IAHR 2017 in Kuala Lampur.
Our article, Numerical Modelling of Debris Accumulations at Masonry Bridge Piers and its Influence on Scouring, is accepted for ICNMMF-III.
The 3rd Steering Committee Meeting was held on the 11th of November 2016 at the University of Exeter.
An overview of the project and work plan was presented. Preliminary experimental results were presented and discussed. Experimental improvements were also demonstrated in a lab tour.
After the lunch, a presentation on use of OpenFOAM for CFD simulations was done and future plans were shared with the Committee. This was followed by a discussion on the preliminary results and work challenges.
In this phase of the project, a series of flume experiments will be performed in a 0.605m wide flume with 10m-long working section using scaled models of potential obstructions to determine the effects of debris on flow and scour.
The experiments are not perfectly representing prototype conditions but are mainly for development and validation purposes in second phase of the project (i.e. computational modelling). Nevertheless, hydraulic conditions of the experiments were designed, to the degree that the conditions allow, based on Froude similarity between scaled model and prototype.
Considering the constraint of the flume width, which is 60.5cm, a single pier or short-span masonry bridge will be modelled. The existence of the bridge arches in is mainly aimed at measuring hydrodynamic forces on the bridge. Non-cohesive sediment (silica sand) is used as the alluvial bed material. Bridge model and debris models are created by 3d printing.
Following parameters are measured during the experiments or when the scour reaches equilibrium stage.
1. Flow velocities: using acoustic Doppler velocimeter;
2. Scour geometry: using echo-sounding concept;
3. Hydrodynamic pressure: using pressure sensors embedded insider the models; and
4. Uplift and lateral forces on the bridge model: using load cells with strain gauge.
The 2nd Steering Committee Meeting was held on the 12th of February 2016 at the University of Exeter.
The meeting was started with an update on the actions from the last meeting. An overall project update project was presented. This was followed by presentation on latest experimental modelling activities and future plan. Afterwards, the CFD phase of the project was introduced and detailed. Then experimental and CFD challenges were discussed.
After the lunch, a demonstration was done in Fluids Lab on velocity measurements using ADV.
We are located at Centre for Water Systems (CWS) at the University of Exeter. Our mailing address is
Centre for Water Systems, College of Engineering, Mathematics and Physical Sciences, University of Exeter, North Park Road, Exeter EX4 4QF, UK
- Regarding different aspects of the project, you may contact Prof Slobodan Djordjevic.
- Regarding experimental aspects, you could contact Dr Prakash Kripakaran or Dr Mohsen Ebrahimi.
- Regarding computational modelling, please contact Dr Gavin Tabor or Dr Recep Kahraman.