Effect and design of an underminer structure

Tammela, Simo ; Marttila, Hannu ; Dey, Subhasish ; Kløve, Bjørn (2010) Effect and design of an underminer structure Journal of Hydraulic Research, 48 (2). pp. 188-196. ISSN 0022-1686

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Official URL: http://www.tandfonline.com/doi/abs/10.1080/0022168...

Related URL: http://dx.doi.org/10.1080/00221681003704202


Wooden debris structures are commonly used in stream restoration to alter sediment transport and flow distributions to improve fish habitats in degraded streams. Various wooden structures were tested in a laboratory flume to determine their ability to change flow patterns, resulting in local scour. A parametric study was made to predict scour hole depth. The results indicate that the underminer structure should cover the full channel width and divert the whole flow below the structure. Maximum scour depth was obtained with a single structure perpendicular to the flow direction and overall scour depth was governed by structural height and sediment particle size distribution. With increasing structure angle with respect to flow, the area and volume of the scour hole increase, whereas the scouring depth decreases. Coarser sediment size reduces scour depth for both single and consecutive structures. The optimum underminer spacing ratio was found to be 2 to 3 times the channel width.

Item Type:Article
Source:Copyright of this article belongs to International Association of Hydraulic Engineering and Research.
Keywords:Brook Restoration; Erosion; Flume Experiment; Scour; Sediment Transport; Siltation; Wooden Debris
ID Code:78814
Deposited On:23 Jan 2012 04:03
Last Modified:23 Jan 2012 04:03

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