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To model uncertainty in WCI, we introduce stochasticity into the wave dynamics of two classic models of WCI, namely the generalised Lagrangian mean (GLM) model and the Craik\u2013Leibovich (CL) model. The key idea for the GLM approach is the separation of the Lagrangian (fluid) and Eulerian (wave) degrees of freedom in Hamilton\u2019s principle. This is done by coupling an Euler\u2013Poincar\u00e9<jats:italic>reduced Lagrangian<\/jats:italic>for the current flow and a<jats:italic>phase-space Lagrangian<\/jats:italic>for the wave field. WCI in the GLM model involves the nonlinear Doppler shift in frequency of the Hamiltonian wave subsystem, which arises because the waves propagate in the frame of motion of the Lagrangian-mean velocity of the current. In contrast, WCI in the CL model arises because the fluid velocity is defined relative to the frame of motion of the Stokes mean drift velocity, which is usually taken to be prescribed, time independent and driven externally. We compare the GLM and CL theories by placing them both into the general framework of a stochastic Hamilton\u2019s principle for a 3D Euler\u2013Boussinesq (EB) fluid in a rotating frame. In other examples, we also apply the GLM and CL methods to add wave physics and stochasticity to the familiar 1D and 2D shallow water flow models. The differences in the types of stochasticity which arise for GLM and CL models can be seen by comparing the Kelvin circulation theorems for the two models. The GLM model acquires stochasticity in its Lagrangian transport velocity for the currents and also in its group velocity for the waves. However, the CL model is based on defining the Eulerian velocity in the integrand of the Kelvin circulation relative to the Stokes drift velocity induced by waves driven externally. Thus, the Kelvin theorem for the stochastic CL model can accept stochasticity in its both its integrand and in the Lagrangian transport velocity of its circulation loop. In an \u201cAppendix\u201d, we also discuss dynamical systems analogues of WCI.<\/jats:p>","DOI":"10.1007\/s00332-020-09665-2","type":"journal-article","created":{"date-parts":[[2020,12,18]],"date-time":"2020-12-18T12:03:37Z","timestamp":1608293017000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":13,"title":["Stochastic Variational Formulations of Fluid Wave\u2013Current Interaction"],"prefix":"10.1007","volume":"31","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6362-9912","authenticated-orcid":false,"given":"Darryl D.","family":"Holm","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2020,12,18]]},"reference":[{"key":"9665_CR1","doi-asserted-by":"crossref","first-page":"609","DOI":"10.1017\/S0022112078002773","volume":"89","author":"DG Andrews","year":"1978","unstructured":"Andrews, D.G., McIntyre, M.E.: An exact theory of nonlinear waves on a Lagrangian mean flow. 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