In the summer of 2013, the Rivers Institute at BCIT received funding to improve ecological values in the Seymour River Estuary, North Vancouver. They hoped to install large woody debris (LWD) structures along the river banks. In order to ensure the long-term stability and appropriate placement of these structures they hired Ebbwater Consulting to complete hydrologic and hydraulic analyses.
Being in a tidal zone, the proposed LWD structures will be subjected to daily fluctuations in water level as well as cyclic flood and ebb flows. The structures would also be subjected to extreme hydraulic conditions under flood flow events. It was important to capture the bounds of both the ‘typical’ daily forces as well as any extreme forces from floods or ocean storms.
Hydrologic and sea level analyses that incorporated climate change were completed to develop typical and extreme boundary conditions for the numerical models. Ultimately, a 2D TELEMAC model of the estuary was developed and run for various combinations of typical and extreme, current and future (under climate change) boundary conditions. Recommendations on the design parameters for the LWD structures were provided to the client.
August 2013 – October 2013