Abstract The authors of the article, on basis laboratory experiments, describe kinematic structure erosion rates water flow in conditions non-cohesive soil lying peceidal canals. A methodology for conducting experiments and analysis results tov research. Dependencies are proposed determining non-eroding taking into account occurrence slopes trapezoidal canal.

Recent discussion of the selective pressures leading to the evolution of modern human postcranial morphology, seen as early as Homo erectus, has focused on the relative importance of walking versus running. Specifically, these conversations have centered on which gait may have been used by early Homo to acquire prey. An element of the debate is the widespread belief that quadrupeds are constrai...