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Experimental Study of Delta Erosion Due to Dam Removal
Authors: Alessandro Cantelli, Chris Paola, Gary Parker
Cantelli, A., Paola, C. and Parker, G., 2004, Experiments on upstream-migrating erosional narrowing and widening of an incisional channel caused by dam removal, Water Resources Research, 40, W03304, doi:10.1029/2003/WR002940 The present paper reports on a laboratory investigation of the erosion of a deltaic front induced by the removal of a dam. We built a laboratory model of a dam, and observed both the sedimentation in the reservoir due to the downstream propagation of a delta front and the erosion of the delta front during dam removal, including measurement of channel morphology and flow field. Based on an analysis of bank erosion two principal erosive trends were detected: during the initial stage of erosion the width of each section quickly decreased to a minimum value, after which the section widened. Undistorted Froude similitude is used to scale the results up to field dimensions.
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Riparian Vegetation and Braided Stream Dynamics
Authors: Efi Foufoula-Georgiou, Chris Paola, Michal Tal, Elizabeth Tilman
1. To study and quantify the interactions between riparian vegetation, channel morphology, and flow dynamics.
2. To investigate how river systems self-organize as a result of these interactions.
3. To investigate spatial and dynamic scaling in braided rivers with and without vegetation.
Reseachers: Michal Tal, Chris Paola, Elizabeth Tilman (Water Resources, Univ. of MN), Efi Foufoula-Georgiou (Civil Engineering, Univ. of MN)
Ongoing experiments at the St. Anthony Falls Laboratory are designed to isolate the effects of vegetation on braided stream dynamics. These experiments show how a fully braided stream with a noncohesive bed transitions to a single-thread (meandering) system when continuously forced with vegetation. Time-lapse photography and measurements of bed topography, flow depth, sediment output, and flow velocities enable us to study and quantify the morphodynamics of the system associated with this change.
Add Dataset to Cart158.11 GB
Authors: Jeff Marr, Peter Willcock
StreamLab06 was a multiphase research endeavor involving academic researchers, federal agencies and stream restoration practitioners. This ongoing project is being conducted in the Main Channel at the St. Anthony Falls Laboratory in Minneapolis, MN. The StreamLab program brings together a spectrum of research expertise (stream ecology and biology, engineering, hydrology, hydraulics and geomorphology) to conduct focused studies on a laboratory controlled, field scale, indoor stream environment.
The first phase of the StreamLab06 project was completed in late March, 2006, and was focused on testing several existing and one new technology for sampling bedload transport. Technologies were tested in separate sets of sand and gravel trials.
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