River hydraulics. Ecohydraulics - flow-biota interactions (fish, plants). Turbulence in open channels. Sediment transport and fluvial geomorphology. Hydraulic and hydrologic modeling. River restoration and fish habitat.
Rivers are an essential component of the earth’s physical landscape and have always been at the centre of human activity. They support rich and dynamic ecosystems, with a diverse flora and fauna. Although rivers have been studied for decades, understanding of their physical and biological processes is still limited due to their innate complexity. Given the growing pressure from urbanization, climate change, and invasive species, a sound understanding of river processes and ecology-hydraulics interactions is needed to preserve the health of our rivers.
In this context, my research aims to investigate physical flow processes (e.g., flow resistance, generation and advection of coherent flow structures, sediment transport) occurring in natural river environments and the relationships between flow structure and aquatic biota (i.e., fish, plants). I have acquired an expertise in the characterisation of flow structure in open-channels with specific studies conducted in laboratory flumes and in gravel-bed rivers using a variety of velocimetry instrumentation such as acoustic Doppler velocimeters (ADVs). I am currently involved in investigating the effectiveness and long-term durability of river restoration structures and the use of computational fluid dynamics (CFD) to optimize the design of restoration measures. I am also investigating flow-biota relationships between submerged obstacles (such as cobbles and boulders) and fish using particle-image velocimetry (PIV) in order to develop guidelines for the conservation and/or restoration of the preferred fine-scale
hydraulic habitat of target fish species.
Please feel free to contact me if you are interested in pursuing postgraduate studies in the above or related fields.
Duguay JM, Lacey RWJ, Castro-Santos, T. (2018). Comparative study of spoiler and weir baffles on upstream passage performance and motivation of brook and brown trout at roadway culverts. Canadian J. of Fisheries and Aquatic Sciences. (in press)
Enders EC, Castro-Santos T, Lacey RWJ. (2017). The effects of horizontally- and vertically-oriented baffles on flow structure and swimming performance of upstream migrating fish. Journal of Ecohydraulics. 2(1): 38-52.
Duguay, JM, Lacey, RWJ, Gaucher J. (2017). A case study of a pool and weir fishway with OpenFOAM and FLOW-3D. Ecological Engineering.103: 31-42.
Duguay JM, Lacey RWJ. (2016). Numerical study of an innovative fish ladder design for perched culverts. Canadian Journal of Civil Engineering. 43: 173-181.
Duguay J, Lacey RWJ. (2015). Effect of fish baffles on the hydraulic roughness of slip-lined culverts. Journal of Hydraulic Engineering - ASCE. 141(1) 04014065
MacVicar B, Dilling S, Lacey J. (2014). Multi-instrument turbulence toolbox (MITT): Open-source MATLAB algorithms for the analysis of high-frequency flow velocity time series datasets. Computers and Geosciences. 73:88-98.
Tremblay P, Leconte R, Lacey RWJ, Bergeron N. (2014). Multi-day anchor ice cycles and bedload transport in a gravel-bed stream. Journal of Hydrology. 519: 364-375.
Tremblay P, Lacey RWJ, Leconte R. (2013). The impact of grain orientation and pebble surface roughness on the bond strength of simulated anchor ice. Cold Regions Science and Technology. 96:36-44.
Lacey RWJ, Neary VS, Liao JC, Enders EC, Tritico HM. (2012). The IPOS framework: linking fish swimming performance in altered flows from laboratory experiments to rivers. River Research and Applications. 28(4): 429-443.
Lacey RWJ, Rennie CD. (2012). Laboratory investigation of turbulent flow structure around a bed mounted cube at multiple flow stages. Journal of Hydraulic Engineering - ASCE. 138(1): 71-84.
Lacey R.W.J., and A.G. Roy (2008). The spatial characterization of turbulence around large roughness elements in a gravel-bed river, Geomorphology, 102, 542-553.
Lacey, R.W.J., and A.G. Roy (2008). Fine-scale characterization of the turbulent shear layer of an instream pebble cluster, Journal of Hydraulic Engineering, 134(7), 925-936.
Lacey, R.W.J., Legendre, P. and A.G. Roy (2007). Spatial scale partitioning of in situ turbulent flow data over a pebble cluster in a gravel-bed river, Water Resources Research, 43, W03416, doi:10.1029/2006WR005044.
Lacey, R.W.J., and A.G. Roy (2007). A comparative study of the turbulent flow field with and without a pebble cluster in a gravel-bed river, Water Resources Research, 43, W05502, doi:10.1029/2006WR005027.
Lacey, R.W.J., and R.G. Millar (2004). Reach scale hydraulic assessment of instream salmonid habitat restoration, Journal of the American Water Resources Association, 40(6): 1631-1644.
Lacey, R.W.J., Duguay, J., MacVicar, B.J. (2018). Comparison of velocity and turbulence statistics obtained using a Vectrino Profiler and PIV. In River Flow 2018: Proc. Int. Conf. Fluvial Hydraul., Lyon-Villeurbanne, France, Sept. 5-8, 6 pp. (Submitted)
Nicol P, Lacey RWJ. (2016). The effect of flow depth on the characteristics of in situ secondary currents in a gravel-bed river. In River Flow 2016: Proc. Int. Conf. Fluvial Hydraul., St. Louis, United States, 209-214.
Duguay, J., Lacey, R.W.J., Hannaford, K., Penny, D. (2014). Evolution of an innovative fish ladder design to address issues of perched culverts. Proceedings of the Transportation Association of Canada Past-Present and Future. Transportation Association of Canada Past-Present and Future, Montreal, Canada, Oct 01, 1-17pp.
Duguay J, Lacey RWJ, Jaillet E, Floriani F. (2014). Roughness coefficient determination and fine scale flow field characterisation of fish baffles in HDPE slip lined culverts. Proceedings of the International Conference on Fluvial Hydraulics - River Flow 2014, Lausanne, Switzerland, Sept 03:293-299
Macvicar B, Dilling S, Lacey J, Hipel K. (2014). A quality analysis of the Vectrino II instrument using a new open-source MATLAB toolbox and 2D ARMA models to detect and replace spikes. Proceedings of the International Conference on Fluvial Hydraulics - River Flow 2014, Lausanne, Switzerland, Sept 03:1951-1959
Tremblay P, Leconte R, Lacey RWJ, Bergeron N. (2013). Anchor ice cycles: observations from a field study on the Stoke River. Proceedings of CRIP - 17th Workshop on the Hydraulics of Ice Covered Rivers. CRIP - 17th Workshop on the Hydraulics of Ice Covered Rivers, Edmonton, Canada, July 21:47-54
Lacey RWJ, van Leeuwen JL. (2012). Influence of bluff body wake structure on fish preferred holding locations. Proceedings of the International Conference on Fluvial Hydraulics - River Flow 2012, San José, Costa Rica, 2012-09-06 (73-78)
Siniscalchi F, Nikora VI, Cameron SM, Lacey RWJ, Marion A. (2010). Flow-vegetation interaction at a scale of individual plant: a case study of Ranunculus penicillatus. Proceedings of River Flow 2010: International Conference Fluvial Hydraulics - River Flow 2010, Braunschweig, Germany, Sept 08: 445-451
Lacey, R.W.J., A.G. Roy and V.I. Nikora (2008). Flow turbulence and characteristic length scales around an instream large roughness element, In: River Flow 2008: Proceedings of the International Conference on Fluvial Hydraulics, Çeşme-İzmir, Turkey, September 3-5, 2008, vol. 1, [eds] M. Altinakar, M.A. Kokpinar, M. Gogus, G. Tayfur, Y. Kumcu, N. Yildirim, pp 135-142, KUBABA Congress Department and Travel Services, Turkey.
Lacey, R.W.J., and A.G. Roy (2007). Turbulence around large roughness elements in a gravel-bed river, In: Proceedings of the Hydraulic Measurements and Experimental Methods 2007 Conference, Lake Placid, New York,10-12 September 2007, EWRI & IAHR, pp. 112-117.
Lacey, R.W.J., and A.G. Roy (2007). The use of concurrent ADV and flow visualization in exploring in situ coherent flow structures, In: Proceedings of 32nd IAHR Congress, Venice, Italy, 1-6 July 2007, 9p, (CD-ROM).
Lacey, R.W.J., and A.G. Roy (2006). Turbulent wake region of large roughness elements: combining flow visualization and high frequency velocity measurements, In: River Flow 2006: Proceedings of the International Conference on Fluvial Hydraulics, Lisbon, Portugal, 6-8 September 2006, vol. 1, [eds] R.M.L. Ferreira, E.C.T.L. Alves, J.G.A.B. Leal, A. H. Cardoso, pp. 125-134, Taylor & Francis/Balkema, London.
Lacey, R.W.J., and R.G. Millar (2001). Application of a two-dimensional flow model for river restoration - a case study, In: Proceedings of the CWRA BC branch conference: Changing water environments - research and practice, Whistler, B.C., Canada, May 8-11, 9p. (CD-ROM).