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Hydraulic Modeling of the LA River from UAV Photogrammetry
Abstract:
<p dir="ltr" style="line-height: 1.38; margin-top: 12pt; margin-bottom: 12pt">In the past century, the natural landscape of the Los Angeles River has faced ecological destruction due to urbanization and channelization. Recently, public interest in revitalization and restoration of the river ecosystem has grown, resulting in project proposals that call for an increase in vegetation and recreational areas. Current modeling of the LA River relies on construction plans featuring its simple trapezoidal silhouette, which may not be sufficient for the organic silhouettes outlined in project proposals. To address the limitations of current models, this study explores an inexpensive channel mapping approach that uses imagery gathered from Unmanned Aerial Vehicles (UAVs) to create hydraulic models using the Hydrologic Engineering Center’s River Analysis System (HEC-RAS) software. We used UAV-derived photogrammetry to generate detailed land-classification and terrain data of a 2-mile, soft-bottom reach of the LA River. With that data, we created a hydraulic model in HEC-RAS. Using the model, we derived the maximum steady and unsteady flow rates for the channel, and compared our results to a computationally derived maximum flow rate using the Manning’s Equation. We found our model created outputs that closely aligned with the computation method currently used. However, it could be improved with integration of a flow gauge and a water-penetrating camera, as our model did not account for dry flow and could not show the actual river bottom. In the future, this method of modeling could be used in the management of river restoration projects to provide accurate assessments of flood risk for changing river channel silhouettes.</p>
Keywords: hydraulic modeling, Los Angeles River, urban hydrology
Authors:
Chris Guo, Department of Earth System Science, University of California, Irvine; Submitting Author / Primary Presenter
Michael Beland, Department of Geography, Geology, and Environment, California State University, Los Angeles; Co-Author (this author will not present)
Alireza Farahmand, Department of Geography, Geology, and Environment, California State University, Irvine; Co-Author (this author will not present)
Alexander Purdom, Department of Geosciences, Middle Tennessee State University; Co-Author (this author will not present)
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Hydraulic Modeling of the LA River from UAV Photogrammetry
Category
In-Person Paper Abstract