TYPES AND DYNAMICS OF RIVER MOUTHS IN RESERVOIRS
https://doi.org/10.7868/S0435428118010030
Abstract
The paper describes river delta formation in mountain and piedmont reservoirs, characterized by high sediments yield, and gives the examples from the Carpathians, Caucasus and Central Asia. In reservoir backwater zone, sharp drop of flow velocities promotes accumulation of coarse sediment fractions, formation of underwater alluvial fan that eventually evolves to delta. In lowland reservoirs, river deltas cannot form even under conditions of prolonged and deep water draw-offs mainly because of a low sediment yield. High-amplitude intra-annual level fluctuations (up to 5–10 m and more) typical for the majority of reservoirs, fluctuations of backwater zone and changing flow velocity regime determine specific features of sediment transport and deposition. Sediments are deposited in a relatively long distance within reservoirs and can be partially eroded when reservoir level falls. Large lowland rivers flowing into reservoirs are as a rule characterized by a presence of alluvial floodplain-channel complexes represented mainly by initial fluvial topography inundated during reservoir formation (for example, Rivers Ob, Yenisei, Ural). Tributary rivers produce multi-channel deltas in inundated trunk valleys.
Supporting agencies: RFBR, project No. 13-05-00156
About the Authors
D. B. Babich
Lomonosov Moscow State University
Russian Federation
Russian Federation
Faculty of Geography
N. N. Vinogradova
Lomonosov Moscow State University
Russian Federation
Russian Federation
Faculty of Geography
V. V. Ivanov
Lomonosov Moscow State University
Russian Federation
Russian Federation
Faculty of Geography
V. N. Korotayev
Lomonosov Moscow State University
Russian Federation
Russian Federation
Faculty of Geography
E. R. Chalova
Lomonosov Moscow State University
Russian Federation
Russian Federation
Faculty of Geography
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Review
For citations:
Babich D.B., Vinogradova N.N., Ivanov V.V., Korotayev V.N., Chalova E.R. TYPES AND DYNAMICS OF RIVER MOUTHS IN RESERVOIRS. Geomorfologiya. 2018;(1):33-44. (In Russ.) https://doi.org/10.7868/S0435428118010030
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