Blar i NTNU Open på forfatter "Smeltzer, Benjamin Keeler"

Airborne Remote Sensing of UpperOcean and Surface Properties, Currents and Their Gradients From Meso to Submesoscales
Lenain, Luc; Smeltzer, Benjamin Keeler; Pizzo, Nick; Maria, Freilich; Colosi, Luke; Ellingsen, Simen Andreas Ådnøy; Grare, Laurent; Peyriere, Hugo; Statom, Nick (Journal article; Peer reviewed, 2023)In this work we present a unique set of coincident and collocated highresolution observations of surface currents and directional properties of surface waves collected from an airborne instrument, the Modular Aerial Sensing ... 
An Improved Method for Determining Near‐Surface Currents From Wave Dispersion Measurements
Smeltzer, Benjamin Keeler; Æsøy, Eirik; Ådnøy, Anna; Ellingsen, Simen Andreas Ådnøy (Journal article; Peer reviewed, 2019)A new inversion method for determining near‐surface shear currents from a measured wave spectrum is introduced. The method is straightforward to implement and starts from the existing state‐of‐the‐art technique of assigning ... 
Biases From Spectral Leakage in Remote Sensing of NearSurface 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 muchused technique. We study the biases and errors in such measurements due to spectral leakage and suggest mitigating procedures. ... 
Current mapping from the wave spectrum
Smeltzer, Benjamin Keeler; Ellingsen, Simen Andreas Ådnøy (Chapter, 2021) 
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 wavelengthdependent Doppler shifts in the ... 
Effect on Doppler Resonance From a NearSurface Shear Layer
Smeltzer, Benjamin Keeler; Li, Yan; Ellingsen, Simen Andreas Ådnøy (Chapter, 2017)For waves generated by a wave source which is simultaneously moving and oscillating at a constant frequency ω, a resonance is well known to occur at a particular value τres of the nondimensional frequency τ = ωV/g (V: ... 
Experimental study of the mutual interactions between waves and tailored turbulence
Smeltzer, Benjamin Keeler; Rømcke, Olav; Hearst, R. Jason; Ellingsen, Simen Andreas Ådnøy (Peer reviewed; Journal article, 2023)When surface waves interact with ambient turbulence, the two affect each other mutually. Turbulent eddies get redirected, intensified and periodically stretched and compressed, while the waves suffer directional scattering. ... 
Observation of surface wave patterns modified by subsurface shear currents
Smeltzer, Benjamin Keeler; Æsøy, Eirik; Ellingsen, Simen Andreas Ådnøy (Journal article; Peer reviewed, 2019)We report experimental observations of two canonical surface wave patterns – ship waves and ring waves – skewed by subsurface shear, thus confirming effects predicted by recent theory. Observed ring waves on a still surface ... 
Optimisation of inversion methods for nearsurface current measurements in regions with strong horizontal shear
Gundersen, Ida Seip (Master thesis, 2021)Havprosessene som finner sted i sjiktet nær overflaten er en av nøkkelfaktorene i klimasystemet, og egnede metoder for å måle strømninger i den øvre delen av vannsøylen er nødvendig for å forstå mønstrer og drivkrefter. ... 
The role of Lagrangian drift in the geometry, kinematics and dynamics of surface waves
Pizzo, Nick; Lenain, Luc; Rømcke, Olav; Ellingsen, Simen Andreas Ådnøy; Smeltzer, Benjamin Keeler (Peer reviewed; Journal article, 2023)The role of the Lagrangian mean flow, or drift, in modulating the geometry, kinematics and dynamics of rotational and irrotational deepwater surface gravity waves is examined. A general theory for permanent progressive ... 
The Error in Predicted Phase Velocity of Surface Waves atop a Shear Current with Uncertainty
Maxwell, Peter; Smeltzer, Benjamin Keeler; Ellingsen, Simen Andreas Ådnøy (Journal article; Peer reviewed, 2019)The effect of a depthdependent shear current U(z) on surface wave dispersion is conventionally calculated by assuming U(z) to be an exactly known function, from which the resulting phase velocity c(k) is determined. This, ... 
Transient wave resistance upon a real shear current
Li, Yan; Smeltzer, Benjamin Keeler; Ellingsen, Simen Andreas Ådnøy (Journal article; Peer reviewed, 2018)We study the waves and wavemaking forces acting on ships travelling on currents which vary as a function of depth. Our concern is realism; we consider a real current profile from the Columbia River, and model ships with ...