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See detailAerating weir at Lom Pangar dam
Savatier, Jérémy; Lino, Michel; Erpicum, Sébastien ULg et al

Conference (2016, March)

Lom Pangar is a new dam under construction in Cameroun. Its aim is mainly flow regulation of the Sanaga River in order to improve and secure hydropower production of downstream facilities. To reduce ... [more ▼]

Lom Pangar is a new dam under construction in Cameroun. Its aim is mainly flow regulation of the Sanaga River in order to improve and secure hydropower production of downstream facilities. To reduce impact on water quality and especially on dissolved oxygen for 25 to 100 m3/s discharge, an aerating weir is going to be implemented downstream of the dam for at least the 10 first years of the dam exploitation. After site selection, preliminary studies have conducted to chose a rockfill stepped weir for technical reasons including availability of materials on the dam work site and asier decommissioning. According to literature, nappe flow is the flow regime providing most effective aeration for this type of structure and application of formulae to the discharge range and geometry of the project leads to choose 50 cm high steps to create this flow regime. The proposed solution has been tested using a 1:1 scale physical model, with the following geometry: 3 m high and 15° downstream slope. Dissolved oxygen concentration has been measured in the upstream reservoir, in the downstream collecting channel and on several steps. Aeration efficiency has been measured and the physical model has been able to validate and optimize the weir design in order to reach the water aeration objectives and limit hydraulic impacts. The works are planned beginning 2017 and water aeration will be monitored. [less ▲]

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See detailEnergy dissipation on a stepped spillway downstream of a Piano Key Weir - Experimental study
Erpicum, Sébastien ULg; Daux, Christophe; Machiels, Olivier ULg et al

in Erpicum, Sébastien; Laugier, Frederic; Boillat, Jean Louis (Eds.) et al Labyrinth and Piano Key Weirs - PKW 2011 (2011)

Piano Key Weir (PKW) is a new type of weir showing appealing hydraulic capacities. Its specific geometric features create different interacting flows and jets downstream of the structure. This suggests ... [more ▼]

Piano Key Weir (PKW) is a new type of weir showing appealing hydraulic capacities. Its specific geometric features create different interacting flows and jets downstream of the structure. This suggests that the use of a PKW to control the flow upstream of a stepped spillway may help in enhancing energy dissipation on the downstream channel. The first results of an experimental study carried out at the Laboratory of Engineering Hydraulics – HACH in the scope of a Coyne & Bellier – Tractebel Engineering project are presented in the paper. The goal of the study was to compare the energy dissipation on a stepped spillway downstream of a PKW with the one which takes place on the same spillway equipped with a standard ogee-crested weir. Despite similar global energy dissipation rates whatever the weir type due to the relative important height of the spillway, significant differences in the aeration of the flow along the spillway have been shown. This paves the way to further investigations. [less ▲]

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