  Topological wave structures, such as vortices and skyrmions, appear in a
variety of quantum and classical wave fields, including optics and acoustics.
In particular, optical vortices have found numerous applications ranging from
quantum information to astrophysics. Furthermore, both optical and acoustic
structured waves are crucial for manipulation of small particles, from atoms to
macroscopic biological objects. Here we report on the controllable generation
of topological structures -- wave vortices, skyrmions, and polarization
M\"{o}bius strips -- in interfering gravity water waves. Most importantly, we
demonstrate efficient manipulation of subwavelength and wavelength-order
floating particles with topologically structured water waves. This includes
trapping of the particles in the high-intensity field zones, as well as
controllable orbital and spinning motions due to the orbital and spin angular
momenta of water waves. Our results reveal the water-wave counterpart of
optical and acoustic manipulations, which paves the avenue for applications in
hydrodynamics and microfluidics.
