Abstract
Paired impermeable or porous obstructions are used to create scour pool habitat. We investigated local scour pools created by paired porous obstructions using laboratory experiments. To examine the influence of porous obstructions on local scour depths and volumes, various densities in the porous obstructions, ratio of obstruction width to channel width and submergence ratio were evaluated. A local scour pool developed when the flow blockage (product of density in the porous obstructions and ratio of obstruction width to channel width) and the ratio of the obstruction width to channel width were ≥5.0 and ≥0.4, respectively. The depth of the scour pool increased with increasing flow blockage, while scour depth reduced as the submergence ratio increased. The scoured volume had a strong relationship with the scour depth around the porous obstructions. Results of the predictive equations were considered reliable for estimating the maximum scour depth and scoured volume around porous obstructions in clear-water conditions.
Highlights
In the past, channels were straightened to prevent flooding but it caused the destruction of riverine ecosystems [1]
We investigated local scour pools associated with discrete paired porous obstructions using laboratory experiments
To investigate the impacts of the flow blockage and submergence ratio on scour pool habitat, variable densities in the obstructions, ratio of the patch width to the channel width, and submergence ratio were considered
Summary
Channels were straightened to prevent flooding but it caused the destruction of riverine ecosystems [1]. There are many studies on size and location of scour pools caused by single deflectors and spur dikes in terms of orientation, height, and length. Maximum scour was observed at caused less turbulence and local scour, and downstream orientation reduced scour pool volume spur dikes oriented perpendicular to the flow [3]. Downstream orientation of dikes triggers the flow to be directed to banks, therebythe impact of submergence ratio (flow depth/deflector height) on scour holes paired requiring more protection on the banks. Whenratio the submergence ratio increased, volume of paired scour holes decreased. Submergence (flow depth/deflector height) the on depth scour and holes around impermeable. Showed that the depth of scour holes increases as the density and width straight channel. Laboratory experiments were conducted in a flume 10 m long (L), 0.4 m wide (W), and 0.4 m deep
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