Abstract
Active bed forms of three major classes are formed in Terek lower reaches during summer floods. They include ripples, dunes of the first order, and dunes of the second order (from smaller to larger), which commonly form an incomplete hierarchy. The morphology of the bed forms is essentially stochastic and can be adequately described by probability distribution functions of bed form characteristics for some narrow ranges of hydraulic flow characteristics. At the same time, the mean values of bed form morphometric characteristics (length, height, and asymmetry) show stable relationships with flow velocity and depth. The celerity of active dunes can be adequately described by a modified Snishchenko–Kopaliani formula. The channelforming sediments that move as bed forms in Terek lower reaches account for 7% of sediment transport rate of all channel-forming sediments, a value near the lower limit for rivers with sand alluvium.
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Alekseevskii, N.I., Bed load transport at a developed structure of channel relief, Meteorol. Gidrol., 1990, no. 9, pp. 100–105.
Alekseevskii, N.I. and Sidorchuk, A.Yu., Morphology and dynamics of channel relief in the Lower Terek, in Zemel’nye i vodnye resursy (Land and Water Resources), Moscow: Izd Mosk. Univ., 1990, pp. 87–95.
Berkovich, K.M. and Sidorchuk, A.Yu., Dynamics of channel relief of the Lower Niger, Izv. Akad. Nauk SSSR, Ser. Geogr., 1983, no. 4, pp. 66–72.
Velikanov, M.A., Dinamika ruslovykh potokov (Channel Flow Dynamics), vol. 2 Nanosy i ruslo (Sediments and the Channel), Moscow: Gostekhizdat, 1955.
Gorelits, O.V., Zemlyanov, I.V., Pavlovskii, A.E., and Illaev, T.S., Channel deformations and runoff redistribution within the Terek River mouth reach after the catastrophic flood of the year 2002, Water Resour., 2006, vol. 33, no. 6, pp. 628–636.
Zaikov, B.D., Srednii stok i ego raspredelenie v godu na territorii SSSR (Average Runoff and Its Inter-Year Distribution in USSR Territory), Moscow: Gidrometeoizdat, 1946.
Lur’e, P.M., Vodnye resursy i vodnyi balans Kavkaza (Water Resources and Water Balance of the Caucasus), St. Petersburg: Gidrometeoizdat, 2002.
Mikhinov, A.E., Instability of sand waves in a deformable channel, Meteorol. Gidrol., 1983, no. 11, pp. 84–91.
Rukhin, L.B., Osnovy litologii (Fundamentals of Lithology), Leningrad: Gostoptekhizdat, 1961.
Sidorchuk, A.Yu., Morphology and dynamics of channel relief forms in Terek mouth area, in Kaspiiskoe more. Gidrologiya ust’ev rek Tereka i Sulaka (Caspian Sea. Hydrology of the Terek and Sulak River deltas), Moscow: Nauka, 1993, pp. 89–102.
Sidorchuk, A.Yu., Evaluating bedload transport rate in a river bed taking into account data on the active and passive bed-forms dynamics, Water Resour., 2015, vol. 42, no. 1, pp. 38–51.
Sidorchuk, A.Yu., Struktura rel’efa rechnogo rusla (Relief Structure of River Channels), St. Petersburg: Gidrometeoizdat, 1992.
Snishchenko, B.F. and Kopaliani, Z.D., On the celerity of bed forms in rivers and laboratory experiments, Tr. GGI (Gos. Gidrol. Inst., State Hydrological Institute), 1978, no. 252, pp. 30–37.
Alekseevskiy, N., Movement of bed forms and sediment yield of rivers, IAHS Publication, 2004, no. 288, pp. 395–403.
Alekseevskiy, N. and Sidorchuk, A., Total sediment yield of the Lena River, Eastern Siberia, Hydrological and Geochemical Processes in Large Scale River Basins. Manaus, 1999, p. 26.
Best, J., The fluid dynamics of river dunes: a review and some future research directions, J. Geophys. Res., 2005, vol. 110, no. 4, p. 1–21.
Vionnet, C., Marti, C., Amsler, M., and Rodriguez, L., The use of relative celerities of bedforms to compute sediment transport in the Paraná River, IAHS Publ., 1998, no. 249, pp. 399–406.
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Original Russian Text © N.I. Alekseevskii, A.Yu. Sidorchuk, 2017, published in Vodnye Resursy, 2017, Vol. 44, No. 2, pp. 147–157.
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Alekseevskii, N.I., Sidorchuk, A.Y. Morphology and dynamics of active bed forms in the Terek R. Channel. Water Resour 44, 226–236 (2017). https://doi.org/10.1134/S0097807817010031
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DOI: https://doi.org/10.1134/S0097807817010031