Within the framework of the linear theory of long waves, on the basis of an accurate analytical solution of a one-dimensional problem, the features of the generation of gravitational surface waves during the movement of a non-deformable landslide body are investigated. Explicit expressions describing the energy of the waves, as well as the strength of the wave resistance, are obtained. It is established that the pumping of energy to the waves, and, consequently, the action of the wave resistance force, is limited in time. It is shown that the calculation of the wave resistance force by the instantaneous parameters of the body motion is impossible due to the fact that the magnitude of this force is determined by the prehistory of the movement of the landslide body. Estimates of the magnitude of the wave resistance force suggest that it can be comparable to the forces of "dry" and turbulent friction.
$^1$Physics Faculty of M.V. Lomonosov Moscow State University