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Handling reservoir floating debris for safe spillway discharge of extreme floods – laboratory investigations
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Hydraulic Engineering. (Vattenbyggnadshydraulik)
2009 (English)Conference paper (Refereed)
Abstract [en]

Floating debris that obstructs the spillway reduces its discharge capacity and could thus constitute a dam-safety risk in an extreme flood situation. Tests are made in a 1:60 Laxede dam model, with about 130 small trees, whose median length is selected on the basis of the prototype data. Without any countermeasure, the spillway capacity is reduced by up to 27%. To prevent debris clogging, two types of debris racks or visors are devised and examined in the laboratory. The visors are composed of sloping beams placed directly on the spillway or on a semi-circular platform. No matter which type of visor one uses, it stops effectively the floating debris and the spillway openings are kept free from the debris. With the same model trees, the reduction in the spillway discharge capacity is only 2 – 3%. The study illustrates the concept of deploying the visors to stop the floating debris, maintain relatively free spillway flow and a marginal reduction in the discharge capacity.

Place, publisher, year, edition, pages
Keyword [en]
Earth-fill dam, spillway, discharge, flood and floating debris
National Category
Civil Engineering
URN: urn:nbn:se:kth:diva-179776OAI: diva2:889435
23th ICOLD Congress, May 2009, Brasilia

QC 20160107

Available from: 2015-12-25 Created: 2015-12-25 Last updated: 2016-01-07Bibliographically approved

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