Browsing NTNU Open by Author "Weichert, Stefan"
Now showing items 1-4 of 4
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Biases From Spectral Leakage in Remote Sensing of Near-Surface Currents
Weichert, Stefan; Smeltzer, Benjamin Keeler; Ellingsen, Simen Ådnøy (Journal article; Peer reviewed, 2023)Remotely measuring subsurface water currents from imagery of the wave field has become a much-used technique. We study the biases and errors in such measurements due to spectral leakage and suggest mitigating procedures. ... -
The Effect of Horizontal Shear on Extracting Water Currents From Surface Wave Data
Weichert, Stefan; Smeltzer, Benjamin Keeler; Ellingsen, Simen Andreas Ådnøy (Journal article; Peer reviewed, 2024)The dispersive motion of surface waves is now routinely used to remotely measure the currents close beneath the surface of oceans and other natural flows. The current manifests as wavelength-dependent Doppler shifts in the ... -
Error Sources in Wave-Based Remote Sensing and Free-Surface Synthetic Schlieren
Weichert, Stefan (Doctoral theses at NTNU;2024:244, Doctoral thesis, 2024)Physical processes at and under the water surface of oceans play a key role in the Earth’s climate. For the models that are used to make predictions of temperature, gas contents, humidity, etc., we rely on data from ... -
The influence of water turbulence on surface deformations and the gas transfer rate across an air–water interface
Bullee, Pim Adriaan; Weichert, Stefan; Nore, Astri; Li, Leon; Ellingsen, Simen Andreas Ådnøy; Hearst, Robert Jason (Journal article; Peer reviewed, 2024)We present experimental results of a study on oxygen transfer rates in a water channel facility with varying turbulence inflow conditions set by an active grid. We compare the change in gas transfer rate with different ...