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• W2178752418 abstract "The reaeration coefficient (k) is an essential and sensitive component of the equations used to calculate whole-stream metabolism (WSM) for a stream reach by the open-channel method. However, the empirical methods used to estimate k (e.g., by propane or sulfur hexafluoride evasion rates) are time consuming and costly. We reasoned that the reaeration rate (the product of k and the dissolved O2 deficit or surplus) and sound level (noise) are related to turbulence in a stream and, thus, sound level should be related to reaeration. We used a simple and inexpensive sound level meter to measure sound levels at a fixed height (30 cm) above key geomorphic features (e.g., pools, riffles, cascades) in several streams in Alaska and Vermont. We calculated a feature-weighted average sound pressure for selected stream reaches based on the proportion of these geomorphic features within each reach. We calculated k in the Alaskan stream reaches based on propane evasion rates and found a strong linear relationship to the feature-weighted average sound pressure (n = 11, r2 = 0.94, p < 0.001). We concluded that the sound pressure method, which requires 0.5 h to complete and relies on inexpensive instrumentation, provides estimates of k that are comparable to estimates from the more resource-intensive volatile gas-evasion method. In the Vermont stream reaches, we were able to create a sound pressure–stage rating curve, similar to a hydrologic rating curve. Combining the k–sound pressure relationship with the sound pressure–stage rating curve holds promise as a way to estimate reaeration continuously, at modest cost and effort, and on a time scale similar to that on which dissolved O2, temperature, and light values are recorded to calculate WSM." @default.
• W2178752418 created "2016-06-24" @default.
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• W2178752418 date "2007-03-01" @default.
• W2178752418 modified "2023-10-01" @default.
• W2178752418 title "Using sound pressure to estimate reaeration in streams" @default.
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• W2178752418 doi "https://doi.org/10.1899/0887-3593(2007)26[28:uspter]2.0.co;2" @default.
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