United States Department of Transportation
i
Study to Compare the Performance of Two Designs to Prevent River Bend Erosion in Arctic Environments
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2010-09-01
[PDF-20.57 MB]
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Abstract:This report presents an evaluation of the performance of two different river training structures to prevent river bend erosion in arctic environments. These structures are located on the Sagavanirktok (referred to as Sag) River on the Dalton Highway (also known as the Haul Road) at Milepost 414 and on Hess Creek. The conceptual design of these river training configurations is diametrically opposed. Structures are facing upstream in the Sag River and downstream in Hess Creek. For this study, both fieldwork and a numerical model were employed. Fieldwork consisted of velocity measurements and bathymetric surveys with an Acoustic Doppler Current Profiler (ADCP) and a Global Positioning System (GPS) device with real-time kinematic (RTK) correction. In addition, breakup on the Sag River was monitored. Numerical work consisted of simulation of different flow and bathymetric configurations during the open-channel season. Results from a physical model built at laboratory scale were used to validate the numerical model. Additional simulations were performed on the Sag River. These simulations analyzed several theoretical scenarios with different structure settings. The objective of this work was to assess the river reach response in terms of flow velocity, Froude number, and specific discharge to changes in the number of barbs and the corresponding modifications in terms of shear stress on the existing barbs.
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