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#estimation

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Inferring River Discharge From Google Earth Images - Critical Flow Theory Can Predict River Discharge Based On The Spacing Of Standing Waves Captured By Google Earth Images
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eos.org/editor-highlights/infe <-- shared technical article
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doi.org/10.1029/2025GL114851 <-- shared paper
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“… KEY POINTS:
• Standing waves in rivers indicate unique hydraulic conditions that allow depth and velocity to be inferred from the spacing of the waves
• Critical flow theory can be used to calculate discharge based on measurements of wavelength and width made using readily available images
• Discharges estimated via the critical flow approach for 82 images agreed closely with discharges recorded at gaging stations (R² = 0.98)…”

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