To substantiate measures aimed at prevention of siltation of supply and transport channels in the Danube lakes (study of hydraulic and alluvial regimes)
Authors: Kulibabin O. H.
Underwater bucket channels connecting the Danube with sluices were built perpendicular to river’s main stream. Water supply tract consists of an supply bucket channel, connecting the Danube with a sluice facility, a transporting channel – from a sluice to the mouth, i.e. to an output of a channel into a lake, and a mouth section of a channel. Throughout the whole period of operation of these facilities silt accumulation has been observed within supply bucket channels, in a lesser degree – within transport channels, and emergence in a mouth section of transport channels of sandbars having considerable dimensions. Throughout the whole period of operation of facilities and channels plenty of money has been spent for cleaning facilities and channels off sediments, so there is a need for deeper examination of the nature of silting phenomenon and minimization of water supply tract siltation through its simple reconstruction.
The aim of this research consists in substantiation of proposals to eliminate or to reduce effects of silting of supply and transport channels under existing conditions and substantiation of proposed necessary structural measures on the basis of proposed mathematical modelling and methods of analytical studies. Therefore methods of analytical studies including probable and statistical approaches used when analyzing processes with constant change of environment were proposed. These studies found that boundaries of supply of inlet channels in an open river’s channel depend on distribution of flow velocities throughout a river’s stream and conditions of stream distribution and flow pattern in the middle of the supply channel depends on shape of an inlet, particularly on shape of its lower side.
These suggestions and studies give us an opportunity to recommend means of controlling a hydraulic regime in the middle of a supply channel. Fighting against deposition of bottom sediments at supply channels may be won after choosing a place for water intake and a type of bucket, as well as after specification of appropriate structural forms and sizes of their inlet components. Therefore the article provides suggestions on research of regime of interaction between the river and a supply channel, dynamics of water exchange in supply channels, forces of
stream masses developing during mixing, hydraulic regime and regime of deposition of supply and transport channels in order to determine the major requirements regarding size of water area of a supply channel.
Tags: circulation; contour flows; siltation; stream; stream velocity; transit streamflows; transport and supply channel; water exchange; whirlpools; вири; водообмін; замулення; контурні течії; потік; транзитні струмені; транспортувальний і підвідний канал; цир- куляція; швидкість потоку
- Chou V. T. Gidravlika otkrytykh rusel [Hydraulics of open channels]. Gosenergoizdat, 1976. 398 p.
- Bernadskiy N. M. Teoriya turbulentnogo potoka i ee primenenie k postroeniyu techeniy v otkrytykh vodoemakh. Spetsialnye voprosy [The theory of turbulent flow and its application to the construction of flows in open water. Special issues]. Gosenergoizdat, 1966. 48 p.
- Zegzhda A. P. Osnovnye polozheniya metodiki rascheta razmerov otstoynika i vremeni ego zaileniya [Summary of methods for calculating the size of the sump and the time of its silting]. Gosenergoizdat, 1969. 59 p.
- Belokon P. N. Vodopriemnye kovshi [Rainwater buckets]. Gosenergoizdat, 1968. 159 p.
- Bernadskiy N. M. Rechnaya gidravlika. T. 1 Obschie formy techeniya [The river hydraulics. Vol. 1 General form of the flow]. Gosenergoizdat, 1953. 196 p.
- Shamov G. I. Granulometricheskiy sostav nanosov rek SSSR [The size distribution of the sediment of rivers of the USSR] // Proc. SHI , 1958, vol. 18, pp. 105-109.
- Sokolov D. Y. Vodozabornye ustroystva dlya gidrostanciy i irrigacii [Water intake device for hydro power and
irrigation]. ONTI, 1957. 374 p.
- Obrazovskiy A. S., Moskvin E. P., Bondar F. I. Hydraulic mode of water reception ladles. Trudy VNII VodGeo – Proc. AUSRI VodGeo, 1978, Ch. I, II, 178 p. (In Russian).
- Pyshkin B. A. O kovshevom vodozbore [About a ladle vodozbor]. Proc. MHMI, 1959. 96 p.
- Velikanov M. A. Ruslovye processy [Channel processes]. Gosizdat fiziko-matematicheskoy literatury, 1978. 212 p.
- Abal’yans S. H. The movement of suspensions in open streams. Proc. SANIIRI, 1987, issue. 136, pp. 154.
- Hachatryan A. G. Otstoyniki na orositel’nykh sistemakh [Settlers on irrigating systems]. Sel’khozgiz, 1968. 92 p.