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Hydraulics Lab - Current Project

Jemez Weir

 

Upon receiving HEC-RAS model results, the United Stated Army Corps of Engineers (USACE) contracted the UNM Hydraulics Laboratory to model a reach of the Jemez River. This reach included  the Jemez Weir, built by the USACE to prevent degradation from moving further upstream, that 1-D modeling indicated was at risk for failure due to scour and future incision downstream. Physical modeling was to include three scenarios at two different model bed elevations, and its purpose was to demonstrate the scour patterns around the weir structure. The results of the physical model show the conceptual counter measures to be working effectively with a noticeable decrease in total scour depths. A short video description of the model can be found here.

 

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Alameda Outlet Structure

  

Final Modeling Report

  

A previous physical model, built and reported on in 1987 at the Waterways Experiment Station (WES), showed the current design to be effective with some danger zones near the bridge (USACE, 1987). Danger zones were defined by flow conditions which created standing waves that encroached on the railroad bridge support beam. Although the 1987 WES model did identify danger zones, the design was deemed to be acceptable with minor alterations which minimized the danger zones. The North Diversion Channel Outfall was modeled for Albuquerque Metropolitan Arroyo Flood Control Authority (AMAFCA) at a 1:84 scale to determine the hydraulic impacts of a proposed design for the bath tub near the railroad bridge (Figure Below). AMAFCA requested the model to simulate 34,000 cfs in the NDC. Ideal design flow conditions for the model showed the hydraulic jump to remain in the same relative location when the baffle teeth were plced into the channel. Removal of the baffle teeth caused the hydraulic jump to progress further downstream past the bridge.

 

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