Author(s): S. M. Borghei; Z. H. Shirazi
Linked Author(s):
Keywords: River-diversion; Hydraulic model; Piles; Meander; Cutoff
Abstract: There are several ways to divert a river or channel partially or completely. The method to be used depends on the duration, availability of materials and construction difficulties. Among the methods, circular pile as permeable walls, or a series of piles placing in rows that water can flow through, can be used. These sorts of structures are commonly used to protect river banks and coastal areas against erosion in different projects. However, since sudden diversion of flow, in case of large rivers, would be costly and dangerous, therefore, permeable wall structure can be used as a method for safe and slow diversion of the river. The method of open pile walls can be practical and safe. This paper is the result of laboratory tests using piles in a 1:50 hydraulic model of one of the largest rivers in Iran, Karun river. The piles were used in two rows with different spacing between them. A very interesting result from the present tests shows that there is an optimized arrangement for the piles that has the best discharge diversion ratio. Surprisingly this is not the closest distance between the piles but a fixed ratio of pile spacing to distance between the two rows of the piles. Finally the results are shown as graphs and recommendations for design of this sort of diversion structure according to the experimental conditions.
Year: 2003