For the safe construction and operation of a bridge it is necessary to have a clear understanding of the landscape, geocryological and hydrogeological features of the territory. In this regard, a review of the geocryological study of the permafrost zone of the bridge crossing area has been prepared; the analysis of the published and archive literature on the geological structure and hydrogeological conditions of the area under study was carried out; field and fund data and data of engineering and geological surveys were studied and analyzed; control and linking field routes and geothermal measurements in wells were carried out. The results obtained in the course of this work served as the basis for the compilation of a permafrost landscape map and then a geocryological map of the bridge over the Lena river in the area of Yakutsk on a scale of 1 : 5 000. The geocryological map shows the spatial heterogeneity of the permafrost-landscape conditions of the territory under consideration due to zonal (altitudinal-belt), regional and local factors. The information base of geocryological characteristics was the data of engineering and geological surveys.

Aliona A. Shestakova
Candidate of Geographical Sciences,
Senior Researcher of Geographic Information Systems (GIS) and Permafrost Mapping Laboratory of the Melnikov Permafrost Institute (Siberian Branch of the Russian Academy of Sciences)
36 Merzlotnaya st., Yakutsk, 677010, Russia
E-mail:aashest@mail.ru

Yaroslav I. Torgovkin
Candidate of Geographical Sciences,
Head of Geographic Information Systems (GIS) and Permafrost Mapping Laboratory of the Melnikov Permafrost Institute
(Siberian Branch of the Russian Academy of Sciences)
36 Merzlotnaya st., Yakutsk, 677010, Russia
E-mail: torgovkin@mpi.ysn.ru

1. Areh A.L., Demchenko R.Ya. Nekotorye rezul’taty mnogoletnikh nablyudenii za protaivaniem grunta v okrestnostyakh Yakutska [Some results of perennial observations of soil thawing in the vicinity of Yakutsk]. In: Ivanov N.S. et al. (eds.). Ehksperimental’nye issledovaniya protsessov teploobmena v merzlykh gornykh porodakh. Moscow: Nauka; 1972. pp. 91–97.
2. Bosikov N.P., Vasiliev I.S., Fedorov A.N. Permafrost landscapes development zones of the Lena-Aldan interfluve [Merzlotnye landshafty zony osvoeniya Leno-Aldanskogo mezhdurech’ya]. Yakutsk: IMZ SO AN SSSR; 1985. 124 p.
3. Varlamov S.P., Skryabin P.N., Skachkov Yu.B. Geotemperaturnyi monitoring gruntov doliny Tuimaada [Geotemperature monitoring of the soils of the Tuymaada valley]. In: Kolodeznikov I.I., Zabolev Yu.V. (eds.). Nauchnoe obespechenie resheniya klyuchevykh problem razvitiya g. Yakutska. Materialy sovmestnoi nauchnoi sessii Akademii nauk Respubliki Sakha (Yakutiya) i Gorodskogo okruga “Gorod Yakutsk” (Yakutsk, 22 December 2009). Yakutsk: OOO “Kompaniya Dani-AlmaS”, 2010. pp. 97–102.
4. Vasiliev I.S. Zakonomernosti sezonnogo protaivaniya gruntov v Vostochnoi Yakutii [Regularities of seasonal soil thawing in Eastern Yakutia]. Novosibirsk: Nauka; 1982. 133 p.
5. Vasiliev I.S. Prostranstvenno-vremennye zakonomernosti formirovaniya deyatel’nogo sloya v landshaftakh Zapadnoi Yakutii [Spatio-temporal patterns the formation of an active layer in the landscapes of Western Yakutia]. Novosibirsk: Nauka; 2005. 228 p.
6. Gavriliev P.P., Ugarov I.S., Efremov P.V. Merzlotno-ehkologicheskii monitoring sel’skokhozyaistvennykh zemel’ v Tsentral’noi Yakutii [Permafrost ecological monitoring of agricultural lands in Central Yakutia]. Earth’s Cryosphere. 1999;3(3):92–99.
7. DeMers M.N. Fundamentals of geographic information systems. New York: John Wiley & Sons, Inc.; 1996. 448 p.
8. Pavlov A.V., Malkova G.V. Small-scale mapping of trends of the contemporary ground temperature changes in the Russian North. Earth’s Cryosphere. 2009;13(4):32–39.
9. Scryabin P.N., Skachkov Yu.B., Varlamov S.P. Osobennosti formirovaniya temperaturnogo rezhima donnykh otlozhenii melkovodnykh ozer Tsentral’noi Yakutii [Peculiarities formation of the temperature regime of bottom sediments of shallow lakes in Central Yakutia]. Geography and Natural Resources. 1992;2:164–168.
10. Soloviev P.A. Kriolitozona severnoi chasti Leno-Amginskogo mezhdurech’ya [Cryolithozone of the northern part of Leno-Amginsky interfluve]. Moscow: AN SSSR; 1959. 144 p.
11. Stashenko A.I. Izuchenie preobrazovanii geokriologicheskikh uslovii pri osvoenii lesnykh prirodnykh kompleksov na yuge Tsentral’noi Yakutii [Study of geocryological transformations conditions for the development of forest natural complexes in the south of Central Yakutia]. In: Grechishchev S.E. (ed.) Kriogennye fiziko-geologicheskie protsessy i metody izucheniya ikh razvitiya. Moscow: VSEGINGEO; 1987. pp. 93–100.
12. Fedorov A.N. Merzlotnye landshafty Yakutii: metodika vydeleniya i voprosy kartografirovaniya [Permafrost landscapes of Yakutia: methods of individualization and problems of mapping]. Yakutsk: IMZ SO RAN SSSR; 1991. 140 p.
13. Shepelev V.V., Lomovtseva N.S. Ozera kriolitozony Bestyakhskoi terrasy r. Leny i ikh vzaimosvyaz’ s podzemnymi vodami [Bestyakhskaya permafrost lakes terraces of Lena river and their relationship with groundwater]. In: Nekrasov I.A. Tematicheskie i regional’nye issledovaniya merzlykh tolshch Severnoi Evrazii. Yakutsk : IMZ SO AN SSSR; 1981. pp. 106–115.
14. Fedorov A.N., Ivanova R.N., Park H., Hiyama T., Iijima Y. Recent air temperature changes in the permafrost landscapes of northeastern Eurasia. Polar Science. 2014;8(2):114–128. DOI: 10.1016/j.polar.2014.02.001.
15. Nelson F.E., Shiklomanov N.I., Christiansen H.H., Hinkel K.M. The Circumpolar-Active-Layer-Monitoring (CALM) Workshop: introduction. Permafrost and Periglacial Processes. 2004;15(2):99–101. DOI: 10.1002/ppp.488.