Item talk:Q239619
From geokb
{
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This study evaluated the potential for measuring discharge via various forms of remote sensing, primarily thermal imaging of flow velocities but also spectrally-based depth retrieval from passive optical image data. We acquired thermal image time series from bridges spanning five streams in Alaska and observed strong agreement between velocities measured\u00a0in situ\u00a0and those inferred by Particle Image Velocimetry (PIV), which quantified advection of thermal features by the flow. The resulting surface velocities were converted to depth-averaged velocities by applying site-specific, calibrated velocity indices. Field spectra from three clear-flowing streams provided strong relationships between depth and reflectance, suggesting that, under favorable conditions, spectrally-based bathymetric mapping could complement thermal PIV in a hybrid approach to remote sensing of river discharge; this strategy would not be applicable to larger, more turbid rivers, however. A more flexible and efficient alternative might involve inferring depth from thermal data based on relationships between depth and integral length scales of turbulent fluctuations in temperature, captured as variations in image brightness. We observed moderately strong correlations for a site-aggregated data set that reduced station-to-station variability but encompassed a broad range of depths. Discharges calculated using thermal PIV-derived velocities were within 15% of\u00a0in situ\u00a0measurements when combined with depths measured directly in the field or estimated from field spectra and within 40% when the depth information also was derived from thermal images. The results of this initial, proof-of-concept investigation suggest that remote sensing techniques could facilitate measurement of river discharge.", "description": "17 p.", "publisher": { "@type": "Organization", "name": "Elsevier" }, "author": [ { "@type": "Person", "name": "Legleiter, Carl J. cjl@usgs.gov", "givenName": "Carl J.", "familyName": "Legleiter", "email": "cjl@usgs.gov", "identifier": { "@type": "PropertyValue", "propertyID": "ORCID", "value": "0000-0003-0940-8013", "url": "https://orcid.org/0000-0003-0940-8013" }, "affiliation": [ { "@type": "Organization", "name": "National Research Program - Central Branch", "url": "https://www.usgs.gov/centers/arizona-water-science-center" }, { "@type": "Organization", "name": "WMA - Integrated Modeling and Prediction Division", "url": "https://www.usgs.gov/mission-areas/water-resources" } ] }, { "@type": "Person", "name": "Kinzel, Paul J. pjkinzel@usgs.gov", "givenName": "Paul J.", "familyName": "Kinzel", "email": "pjkinzel@usgs.gov", "identifier": { "@type": "PropertyValue", "propertyID": "ORCID", "value": "0000-0002-6076-9730", "url": "https://orcid.org/0000-0002-6076-9730" }, "affiliation": [ { "@type": "Organization", "name": "Colorado Water Science Center", "url": "https://www.usgs.gov/centers/colorado-water-science-center" }, { "@type": "Organization", "name": "National Research Program - 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