Fortnightly modulation of the estuarine circulation in Juan de Fuca Strait

摘要: Riverine discharge into the Strait of Georgia sets up a well-defined estuarine circulation within Juan de Fuca Strait, main path for freshwater outflow to continental shelf. At landward end water flows through narrow channels in which strong tidal currents are known induce significant mixing column, and spring-neap modulation exchange. A three-dimensional prognostic numerical model has been developed study around Vancouver Island, British Columbia. In series simulations, is established by Fraser River discharge. fortnightly imposed on over various sills simulate regime. The resulting variation found be largely limited eastern section vicinity sills. Data from current meter moorings surface salinity data lighthouse stations compare favorably with results. effect local wind forcing exchange also examined. capable simulating those rare events during concurrence river freshet, neap tide northwest allows stronger pulse fresh escape relatively unmixed Strait. disturbance then propagates along northern shore strait as first mode internal Kelvin wave. Finally, export onto shelf It that small amplitude coastal trapped waves generated near mouth Fuca. However, this signal weak comparison energetic wind-induced variations typically