SPECIALITY OF LOW RELEASE CALCULATIONS ON SMALL RIVERS ON THE EXAMPLE OF THE OREDEZH RIVER
The article regards the movement of the negative and positive release waves from the reservoir on the Oredezh River. There was a model of unsteady water motion used for calculation the spread of the release wave. The release was conducted on 06/19/2017 and consisted of three phases. In the first phase, the gate was closed and the water discharge fell from 3.6 to 2.5 m3/s. An hour later the gate was raised and during a half an hour water was released with an average flow rate of 4.2 m3/s. There were 7 points organized to monitor the dynamics of water levels in the river. They were located at a distance of 91.5 to 2443 m from the dam. The observation interval was 1 minute on most targets.
There is advisable to use a one-dimensional model of unsteady water motion (Saint-Venant equation) for calculating small release waves of slowly changing unsteady water motion in cases where topographic materials are available. This allows to determine the stream features over the whole considered river extension. The system of difference equations is solved by the tridiagonal matrix algorithm. The values of the water discharge and water levels for the next estimated time interval are obtained along the entire channel as a result of this shuttle.
The experiment indicated that the used model makes it possible to calculate the unsteady water movement on small rivers with releases comparable to the initial water discharge and even less. The maximum variences between the measured and calculated water levels during the negative wave did not exceed 15.0 cm, and the positive one – 4.0 cm.
Gil'denblat Ya.D., Merkulov V.V., Semikolenov A.C. Neustanovivshiisya rezhim v nizhnem b'efe gidrostantsii [Unsteady mode in the downstream of the hydroelectric station]. Moscow, Publ. of USSR Academy of Sciences, 1948. 144 p. (In Russian).
Grushevskii M.S. O vliyanii poim na rasplastyvanie voln popuskov (po materialam nablyudenii GGI na reke Tvertse) [On the effect of floodplains on the spreading of waves of releases (based on observations of the GGI on the Tverts river)]. In Kondrat'ev N.E., Grushevskii. M.S. (eds.) Trudy Gosudarstvennogo gidrologicheskogo instituta. Vypusk 117. Issledovaniya neustanovivshegosya dvizheniya vody v estestvennykh ruslakh i vodoemakh [Transactions of the State Hydrological Institute. Issue 117. Investigations of the unsteady movement of water in natural channels and reservoirs]. Leningrad, Publ. of Gidrometeoizdat, 1964, p. 56-62. (In Russian).
Grushevskii M.S. Volny popuskov i pavodkov v rekakh [Waves of releases and floods in the rivers]. Leningrad, Publ. of Gidrometeoizdat, 1969. 337 p. (In Russian; abstract in English).
Grushevskii M.S., Rusinov M.I., Fedoseev V.A. Raschety zatopleniya poimy reki Irtysha [Calculations of flooding of the Irtysh River floodplain]. In Grushevskii M.S. (ed.) Trudy Gosudarstvennogo gidrologicheskogo instituta. Vypusk 121. Issledovaniya neustanovivshegosya dvizheniya vody v otkrytykh potokakh [Transactions of the State Hydrological Institute. Issue 121. Studies of the unsteady movement of water in open streams]. Leningrad, Publ. of Gidrometeoizdat, 1965, pp. 56-68. (In Russian).
Dokhnadze G.P. Issledovanie rasprostraneniya voln popuskov na reke Obi v zimnikh usloviyakh metodom chislennogo eksperimenta [he study of the propagation of releases waves on the Ob River in winter conditions by the method of numerical experiment]. In Grushevskii M.S. (ed.) Trudy Gosudarstvennogo gidrologicheskogo instituta. Vypusk 140. Issledovaniya i raschety neustanovivshegosya dvizheniya vody v rekakh [Transactions of the State Hydrological Institute. Issue 140. Investigations and calculations of unsteady water movement in rivers]. Leningrad, Publ. of Gidrometeoizdat, 1967, pp. 91-107. (In Russian).
Ivanova A.A., Ruppert M.L. Raschet rasprostraneniya voln popuskov na reke Sviri v zimnikh i letnikh usloviyakh i sopostavlenie ego s naturnymi dannymi [Calculation of the propagation of waves of releases on the Svir River in winter and summer conditions and its comparison with field data]. In Kondrat'ev N.E. (ed.) Trudy Gosudarstvennogo gidrologicheskogo instituta. Vypusk 136. Issledovaniya neustanovivshegosya dvizheniya vody i ruslovykh protsessov [Transactions of the State Hydrological Institute. Issue 136. Investigations of Unsteady Water Movement and Channel Processes]. Leningrad, Publ. of Gidrometeoizdat, 1966. (In Russian).
Rozenberg L.I. Osobennosti rascheta neustanovivshegosya dvizheniya vody v usloviyakh podpora [Features of the calculation of unsteady water movement in conditions of backwater]. In Grushevskii M.S. (ed.) Trudy Gosudarstvennogo gidrologicheskogo instituta. Vypusk 161. Issledovaniya neustanovivshegosya dvizheniya vody i gryadovogo peremeshcheniya nanosov [Transactions of the State Hydrological Institute. Issue 161. Investigations of the unsteady movement of water and ridge movement of sediment]. Leningrad, Publ. of Gidrometeoizdat, 1968, pp. 58-64. (In Russian).
Vinogradova T.A. Zakonomernosti rasprostraneniya volny polovod'ya v Obsko-Tazovskoi ust'evoi oblasti. Diss. kand. geogr. nauk [Patterns of propagation of a flood wave in the Ob-Taz estuary region. Ph. D. (Geography) Thesis]. Leningrad, 1987. 172 p. (In Russian).
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