Subset of Currents Data from the Operational Hydrodynamic Prediction System (OHPS)

Extract of the Meteorological Service of Canada Datamart: The Operational Hydrodynamic Prediction System (OHPS) is a 2D hydrodynamic prediction system for the St. Lawrence River and fluvial estuary. It helps to better understand flows impacting the St. Lawrence ecosystem and serves as a decision-making tool for the integrated management of the St-Lawrence. Three components are integrated in OHPS system. The first one "steadysol" conducts daily steady-state flow analyses, 4 times per day at 00Z, 06Z, 12Z and 18Z, respectively, over a simulation domain extending from Montreal to Trois-Rivières. The second and third components, i.e. "analysis" and "forecast", provide continuous analyses and 48-hrs forecasts, respectively, for unsteady flows over an extended St. Lawrence domain of which the upstream boundaries locate in Carillon and Beauharnois while the downstream tidal boundary is near Saint-Joseph-de-la-Rive, respectively, 4 times a day at 00Z, 06Z, 12Z and 18Z. The system provides high-resolution outcomes for various parameters such as water levels, depth-averaged velocities and derived attributes, over the simulated domains.

The data available in the SLGO catalog provide the vector components of the current in x and y directly from the model's “analysis” and “forecast” modules, as well as the calculated magnitude and direction of the currents. The dataset provides hourly data for the last three days and includes 48-hour forecasts derived from the latest model run. Spatially, the dataset covers the St. Lawrence River from the Lac Saint-Louis upstream of Montreal (Qc, Canada) to Île aux Coudres (Qc, Canada). The data in the catalog has been converted by SLGO from its original polar stereographic grid to a regular grid in the WGS84 system.

An interactive visualization of this dataset is available via the SLGO's Nautilo app