• 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 ...
    • Effect on Doppler Resonance From a Near-Surface 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: ...
    • Observation of surface wave patterns modified by sub-surface 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 sub-surface shear, thus confirming effects predicted by recent theory. Observed ring waves on a still surface ...
    • 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 depth-dependent 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 wave-making 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 ...