Two treatments of the origin of ridge topography in the Kuraiskaya depression of Gornyi Altai

On the basis of the regularities of channel flow dynamics and the propagation of the emptying wave, it is shown that the value of the mean flow velocity above the field of giant ripples necessary for the ridge movement cannot be attained under given hydraulic and geomorphological conditions. Presented are the erosional dissection mechanisms for the surface of fluvioglacial deposits which contribute to the subparallel occurrence of ephemeral streams.