@inproceedings{5736189,
  abstract     = {{In the last few decades, a lot of research attention has been paid to flow-vegetation interactions. Starting with the description of the flow field around uniform macrophyte stands, research has evolved more recently to the description of flow fields around individual, distinct patches. However, in the field, vegetation patches almost never occur in isolation. As such, patches will influence each other during their development and interacting, complex flow fields can be expected.
 
In this study, two emergent patches of the same diameter (D = 22 cm) and a solid volume fraction of 10% were placed in a side-by-side configuration in a lab flume. The patches were built as an array of wooden cylinders, and the distance between the patches (gap width Delta) was varied between Delta = 0 and 14 cm. Flow measurements were performed by a 3D Vectrino Velocimeter (Nortek AS) at mid-depth of the flow. Deposition experiments of suspended solids were performed for selected gap widths.
 
Directly behind each patch, the wake evolved in a manner identical to that of a single, isolated patch. On the centerline between the patches, the maximum velocity U-max was found to be independent of the gap width Delta. However, the length over which this maximum velocity persists, the potential core L-j, increased linearly as the gap width increased. After the merging of the wakes, the centerline velocity reaches a minimum value U-min. The minimum centerline velocity decreased in magnitude as the gap width decreased. The velocity pattern within the wake is reflected in the deposition patterns. An erosion zone occurs on the centerline between the patches, where the velocity is elevated. Deposition occurs in the low velocity zones directly behind each patch and also downstream of the patches, along the centerline between the patches at the point of local velocity minimum. This downstream deposition zone, a result of the interaction of neighbouring patch wakes, may facilitate the establishment of new vegetation, which may eventually inhibit flow between the upstream patches and facilitate patch merger.}},
  author       = {{Meire, Dieter and Kondziolka, John and Nepf, Heidi}},
  booktitle    = {{RIVER FLOW 2014}},
  editor       = {{Schleiss, Anton J and de Cesare, Giovanni and Franca, Mario J and Pfister, Michael}},
  isbn         = {{9781138026742}},
  keywords     = {{SCALE-DEPENDENT FEEDBACK,SUBMERGED FLEXIBLE VEGETATION,ECOSYSTEMS,RESISTANCE,SEDIMENT,PATTERNS}},
  language     = {{eng}},
  location     = {{Lausanne, Switserland}},
  pages        = {{401--408}},
  publisher    = {{CRC Press}},
  title        = {{Patches in a side-by-side configuration: a description of the flow and deposition fields}},
  year         = {{2014}},
}

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