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Abstract.

At the request of the Trinity River Restoration Program (TRRP), the Bureau of Reclamation’s Sedimentation and River Hydraulics group updated a previously developed two-dimensional hydrodynamic model with topography and bathymetry surveyed in 2016. The updated model predicts the spatial patterns of water depth, velocity, and shear stress and is used to estimate the location, quantity, and quality of salmonid habitat in the Trinity River between Lewiston Dam and the junction with the North Fork. The development of the original model began in the fall of 2013 and was completed in the summer of 2015. That model is based on the topography and bathymetry of the Trinity River surveyed in 2011 and 2012, estimates of channel and floodplain roughness, discharge from Lewiston dam and six tributaries, and the outlet water surface elevation for a given discharge. This report describes the update of that 40 Mile Model with new topography and bathymetry that reflects both the natural and man-made changes of the river since 2012. All model runs described below are steady-state models that simulate a constant discharge over an immobile bed.