Erosion-accumulation system of closed cycle and formation of piedmont alluvial plains

Abstract

Several types of erosional-sedimintation systems with closed cycle of evolution have been identified for the first time, such as «river – lake», «ephemeral stream – fan», which are typical of arid piedmonts. The types are defined and described Principal attention is given to the alluvial - proluvial - lacustrine processes interaction, to the transition from linear to areal erosion, and to a peculiar type of morphogenesis which forms the piedmont alluvial plains of complex - alluvial-proluvial, proluvial-lacustrine, alluvial-lacustrine - genesis.