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Our Gabion Weirs Design Criteria at the ICCE 2017

gabion

Our experimental study was presented at the International Conference of Civil Engineering hosted by the Polytechnic University of Tirana

Our Civil Engineering Technologist Taulant Alilanj presented the paper ‘Physical Model Tests on Gabion Weirs to Develop Specific Design Criteria for Shorter Dissipation Basins’, at the International Conference of Civil Engineering-ICCE 2017, organised by the Faculties of Civil Engineering of the Polytechnic University of Tirana and the University of Pristina, held in Tirana on October 12th– 14th, 2017. He presented the results of an experimental study on water flow characteristics over a gabion weir in a river conducted at our CTH – Hydraulic and Water Resources Technological Center at San Paulo University, Brazil.

Engineers, researchers and professionals from all over world were invited and encouraged to participate in this conference by submitting written contributions and presenting their works in the fields of Structural and Earthquake Engineering, Construction Technology and Materials, Geotechnical Engineering, Hydraulics Engineering and others.

We were delighted to accept the invitation of the Dean of the Tirana Faculty and to share our knowledge in Hydraulic Engineering, a field where we can boast 130 years of experience as we invented the famous gabion in the 1890s, while carrying out erosion protection and river channel reconstruction works along the River Reno, in Bologna, Italy. Gabions are modular units which are particularly suitable to form flexible, permeable and monolithic hydraulic and erosion control structures.

In mountainous countries, the control of erosion in torrents and streams can be of major importance because the halting of bed degradation in the upper stretches can reduce the occurrence of landslides and the deposition of material in the lower stretches.

Erosion control is reached by lowering the water velocity, which can be obtained through the construction of a series of gabion weirs. These are designed considering the dissipation of the kinetic energy and often require a secondary downstream weir: a counterweir or a lowered dissipation basin.

Our Civil Engineering Technologist Taulant Alilanj presented the results of an experimental study on water flow characteristics over a gabion weir, aiming to verify whether the existing theoretical formulations to calculate the length of the dissipation area (stilling pool) are suitable for gabion weirs and possibly develop new design criteria.

The study was conducted at our CTH – Hydraulic and Water Resources Technological Center at San Paulo University, Brazil. There we created a bi-dimensional physical model of a water channel, reproducing a vertical gabion weir with either counterweir or lowered basin. These two weir types were compared according to several sets of parameters, including water velocity, flow depth, discharge, hydraulic head, weir height, dissipation basin length and others.

Test results indicate that the length of the lowered dissipation basin presents smaller values than those based upon theoretical equations and that the dissipation conditions are better for the case of the lowered basin instead of the counterweir, especially as far as the erosion downstream the basin is concerned.

Following these results, we designed and installed many gabion weirs with counterweirs, lined dissipations basins and top concrete grouting in Albania in the last two years. Therefore, our Taulant was able to present also some of our most significant case studies on the Gomsiqe, Lerini and Bugjoni streams, where our solutions are showing their effectiveness and reliability.

If you missed the ICCE 2017 Conference, you can read the full paper here.

For more information on our Hydraulic Works solutions, please contact us.

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