COMPARATIVE ESTIMATION OF GROUNDWATER INFLOW TO MAIN RIVERS OF TVER REGION (UPPER VOLGA, MOLOGA AND ZAPADNAYA DVINA) ACCORDING TO HYDROLOGICAL AND HYDROCHEMICAL DATA 

Yakovlev Peter Ivanovich, Hidrologist of first category, Research center «Geoecology» (63 15 let Oktyabrya street, Tver, Russia), akva-petr.1947@mail.ru

556.3+556.5 

Background. The article comparatively estimates groundwater inflow into main rivers of Tver region by its linear characteristics – flow rate, q l/sec km. The given hydrological inflow parameters characterize the water content of the river systems in the low-flow period in the majority of Russian regions.
Materials and methods. As the indicators of groundwater inflow into rivers the author used mean annual 30-day water discharges of winter low-flow from stationary and temporary water posts of various departments on main regional rivers. Hydrological characterisitcs of river and ground waters are taken from the library materials of Roshydromet and “Rosnedra” Federal agency.
Results. It is confirmed that the Upper Volga lower the city of Rzhev drains deep groundwaters, and the Mologa and Zapadnaya Dvina rivers feed predominantly from the upper ground waterbearing strata in the low-flow period. Hydrochemicalindicators of river and ground waters indirectly characterize the intensity of groundwater inflow into main regional rivers.
Conclusions. It is shown that the parameters of groundwater inflow into rivers depend on climatic, soil, geological and hydrogeological conditions of the river basins under consideration, as well as on the value of erosive cut of the regional watercourse valleys and the depth of drainage influence.

underground waters, river waters, surface waters, source area, discharge area, geological and structural analysis, hydrochemical testing, thermometric, hydrometric survey, ion flow, complex method.

1. Gosudarstvennyy vodnyy kadastr. T. 1, vyp. 23. Basseyn Verkhney Volgi; vyp. 5. Basseyn Baltiyskogo moray [State water cadaster. Volume 1, issue 23. Upper Volga basin; issue 5. Balsit sea basin]. Leningrad: Gidrometeoizdat, 1986.
2. Otsenka podzemnogo pritoka v reki Nechernozemnoy zony RSFSR [Estimation of groundwater inflow into rivers of Non-chernozem zone of RSFSR]. Leningrad, 1986, vol. 1.
3. Yakovlev P. I., Merkulovich A. N. Vyyavlenie zakonomernostey formirovaniya ekspluatatsionnykh resursov podzemnykh vod severo-zapadnoy chasti MAB, tema 629-85, VNIGIK [Revelation of regularities in formation of operational resources of underground waters of the north-west part of Moscow artesian basin, topic 629-85, All USSR research and construction institute of geophysical methods of research, testing and control of oil-and-gas exploratory wells]. Tver, 1987.
4. Kuzovlev V. V., Shlyatterer M. Trudy presnovodnogo obsledovaniya. T. 1: otchet ob ekspeditsii po Verkhney Volge v 2005 godu, IGAN, TGTU, TGU, universitet Insburg [Works on fresh water examination. Volume 1: report on expedition along the Upper Volga river in 2005, IGAN, TSTU, TSU, Insburg university]. Tver, 2006.
5. Voda i ekologiya [Water and ecology]. 2012, no. 2–3.
6. Voda i ekologiya [Water and ecology]. 2012, no. 1.
7. Lebedeva N. A. Estestvennye resursy podzemnykh vod Moskovskogo artezianskogo basseyna (MAB) [Natural resources of underground waters of the Moscow artesian basin]. Moscow: Nauka, 1972.
8. Otsenka vodnykh resursov Moskovskogo artezianskogo basseyna po dannym izuchennosti na 01.01.1972 g [Estimation of water resources of the Moscow artesian basin by research data up to 01.01.1972]. Leningrad, 1972.
9. Geologicheskie i gidrogeologicheskie karty, m 1:200 000 s poyasnitel'nymi zapiskami, listy [Geological and hydrological maps, scale 1:200 000 with explanatory notes, sheets] 0-36-II; 0-36-III; 0-36-XVIII; 0-36-XXIV; 0 36-XXVIII; 0-36-XXXIV; 0-36-XXXV; 0-37-XIII; 0-37-XIX.
10. Gidrogeologiya SSSR. T. 1. Moskovskaya i smezhnye oblasti [Hydrogeology of USSR. Volume 1. Moscow and adjacent regions]. Moscow: Nedra, 1966.
11. Gidrologicheskie ezhegodniki za 1937–1990 gody. T. 4, vyp. 1–3. Verkhnevolzhskiy rayon; T. 1, vyp. 4. Basseyn Baltiyskogo morya [Hydrological yearbooks of 1937-1990. Volume 4, issue 1-3. Upper Volga region; Volume 1, issue 4. Baltic Sea basin]. Gidrometeoizdat, 1938–1991.
12. Markov M. L. Problemy otsenki estestvennykh resursov podzemnykh vod po gidrologicheskim dannym v usloviyakh izmeneniya klimata [Problems of estimation of naturalunderground water resources by hydrological data in conditions of climate change]. Saint Petersburg, 2008.