Abstract
Abstract
Highlights
Information on flow and turbulence structure inside and around a porous region placed in an open-channel flow is relevant for understanding flow structure and sediment erosion/deposition processes in rivers, estuaries and coastal regions containing aquatic canopies (Raupach, Finnigan & Brunnet 1996; Nepf 2012)
In some cases, marked differences in the streamwise variation of some of the global variables describing flow and turbulence structure inside the array and the horizontal shear layer were observed for arrays with similar aW values but with different diameters of the solid cylinders or for arrays with similar aW values containing solid cylinders of a different shape
As the front face of the array is permeable, the downflow penetrating inside the array induces downwelling inside the corridors of higher velocity magnitude formed in between the cylinders, especially in the region of strong flow divergence situated near the front face of the array
Summary
Information on flow and turbulence structure inside and around a porous region placed in an open-channel flow is relevant for understanding flow structure and sediment erosion/deposition processes in rivers, estuaries and coastal regions containing aquatic canopies (Raupach, Finnigan & Brunnet 1996; Nepf 2012). In the case of an array placed in a shallow open channel, the spatial development of the horizontal shear/mixing layer is expected to be affected by bed friction once the size of the vortices becomes comparable with the channel depth (Chu & Babarutsi 1988; Cheng & Constantinescu 2020) For long arrays, this leads to a stabilization of the layer growth (e.g. close to constant width) at large distances from its origin (Finnigan 2000; Ghisalberti & Nepf 2004; Sukhodolov & Sukhodolova 2012a).
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