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Title: Rapid watershed assessment tools based on high-resolution terrain data
Authors: Haring, Christopher P.
Theiling, Charles H.
Dougherty, Michael P.
Keywords: Watersheds
Remote sensing
Optical radar
Publisher: Coastal and Hydraulics Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Technical Note (Engineer Research and Development Center (U.S.)) ; no. ERDC/CHL CHETN-VII-22
Abstract: The goal of this project was to develop rapid watershed assessment methods to estimate channel stability and sediment transport potential using high resolution terrain data (Light Detection and Ranging-LiDAR) to support US Army Corps of Engineers (USACE) watershed planning. This project developed a suite of tools based on advanced remote sensing technologies (LiDAR) that use off-the-shelf, high-resolution terrain data to rapidly assess watershed condition at the channel, floodplain, valley, and watershed scales. The widespread availability of high-resolution terrain data provides an opportunity to assess watershed conditions in great detail over large spatial extents. Automated geomorphometric tools for extracting key floodplain, valley, and watershed scale metrics are widely developed and available. However, existing toolsets have yet to automate and identify many of the well-established fluvial geomorphological metrics and related empirical relationships at the channel scale. The metrics include width-to-depth and entrenchment ratios, sinuosity, meander wavelength, belt width, and others. For this project, a channel assessment method was developed using a new LiDAR-Hydraulic Geometry Relationships (HGR)-based approach for developing regional curves (Haring et al. 2019). Regional curves relate bankfull channel dimensions and discharge to watershed drainage area and are the basis for analyzing and defining channel metrics at large spatial scales within a watershed for this rapid watershed assessment method. If regional or LiDAR-HGR curves are unavailable for a study area, additional channel assessment methods are in development that use existing hydraulic model depth grids and existing channel surveys for analyzing and defining channel metrics.
Description: Technical Note
Gov't Doc #: ERDC/CHL CHETN-VII-22
Rights: Approved for Public Release; Distribution is Unlimited
Size: 10 pages / 730.95 kB
Types of Materials: PDF/A
Appears in Collections:Technical Note

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