Journal article
Flow resistance in saltmarsh and mangrove vegetation in an Australian coastal wetland
Proceedings of the Seventh International Conference on Hydroscience and Engineering
16 Apr 2007
Abstract
Flow in estuarine wetlands is typically shallow, unsteady and non-uniform. Vegetation within these wetlands is emergent under most flow conditions, and vegetation drag is the main component of flow resistance. In adjacent tidal creeks, however, the substrate is typically devoid of vegetation and bed roughness is the major resistance component. A number of formulations have been presented for calculation of resistance due to bed roughness; however, few have been tested in low energy estuarine environments. In order to test the applicability of these approaches to field conditions, measurements using acoustic Doppler velocimeters were conducted in a wetland in the Hunter estuary, southeast Australia. Vegetation at the field site was comprised of two species of saltmarsh (Sarcocornia quinqueflora and Sporobolus virginicus) and one species of mangrove (Avicennia marina). Unvegetated tidal creek substrates occurred in both the mangrove and saltmarsh habitats. Stem density of mangroves in the field was comparable to previous laboratory studies; saltmarsh stem density was substantially higher and varied with depth of inundation. Field results allowed for the development of resistance relations for each vegetation type and for fully turbulent flow over unvegetated substrates. Resistance of unvegetated substrates under transitional flow conditions was not well characterized using the applied formulations.
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Details
- Title
- Flow resistance in saltmarsh and mangrove vegetation in an Australian coastal wetland
- Creators
- Alice Howe (Author) - Drexel University (1970-)José Rodríguez (Author) - Drexel University (1970-)
- Publication Details
- Proceedings of the Seventh International Conference on Hydroscience and Engineering
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- DU; College of Engineering; Civil, Architectural, and Environmental Engineering
- Identifiers
- 991014632682804721