The application of a 2D hydraulic-habitat model, River2D, to simulate flows and fish habitat areas in a reach of the Nicolet River (Quebec, Canada) containing two sets of double-wing rock current deflectors to enhance fish habitat was examined. Depth-averaged velocity in the reach was determined using one or two measurement points in the vertical under the assumption that the profile was logarithmic; however, the presence of boulders and obstructions disturbed the profile, making it difficult to characterize using only two measurement points. The sensitivity of the simulation results to roughness characterization, topographic scale, mesh refinement, and boundary conditions was evaluated. The simulated and observed depths had correlation coefficients of 0.93 to 0.97, while the velocity correlation coefficients were 0.56 to 0.67. Qualitatively, the model accurately predicted the flow patterns, e.g. the recirculation zones downstream of the deflectors. Habitat suitability curves for brown trout, taken from literature, were used in the habitat model. Simulated discharges from 0.74 m3/s to 1.94 m3/s were critical minimum flows for suitable spawning brown trout habitat. The model was adequate for qualitatively simulating flow and habitat in this reach, however, the complex flow conditions may be better represented by a 3D model.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.99003 |
| Date | January 2005 |
| Creators | Ng, Karen Pei-Tak. |
| Publisher | McGill University |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Format | application/pdf |
| Coverage | Master of Engineering (Department of Civil Engineering and Applied Mechanics.) |
| Rights | © Karen Pei-Tak Ng, 2005 |
| Relation | alephsysno: 002340412, proquestno: AAIMR25001, Theses scanned by UMI/ProQuest. |
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