Abstract
The Agrakhan Bay of the Caspian Sea is a unique hydrographic and environmentally valuable object at the mouth of the Terek River. At the beginning of the 20th century, it was a typical sea bay; however, by the 21st century, it lost the features of a marine area and a single water body and was divided into two parts with their specific hydrographic network, water regime, landscapes, biota, and anthropogenic load. Rehabilitation of the wetlands of the former sea bay requires urgent and scientifically grounded measures, as well as good knowledge of the causes and features of its rapid degradation and data on its current hydrological-morphological and hydroecological state. In 2018–2020, the authors carried out a series of field reconnaissance, geodetic, hydrometric, botanical, and hydrochemical works in this part of the mouth, created a network of stations, took numerous water samples and bottom soil samples, and analyzed them in laboratories. A vast array of data from Roshydromet (Russian Hydrometeorological Service) stations, as well as multi-temporal cartographic materials and satellite images, have been accumulated and studied; a multilayer GIS and various maps, empirical dependencies, diagrams, and graphs have been constructed; the results of studies by outside specialists have been considered. This study has made it possible to comprehensively describe the current state of the former Agrakhan Bay, build a depth map, a landscape map, a map of bottom sediments, a map of macrophytes, and a map of hydrochemical parameters, describe the water regime and water balance of the main water bodies of the former bay, determine the relationships between the main hydrological and morphological characteristics, etc. Patterns, causes, long-term stages, and parameters of the unfavorable morphodynamics of the Agrakhan Bay in the 20th century and at the very beginning of the 21st century have been studied. This has made it possible to justify measures for partial restoration of the hydrological and ecological potential of the water bodies of the former Agrakhan Bay.
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REFERENCES
Alekseevskii, N.I., Magritsky, D.V., and Samokhin, M.A., Runoff floods in the Terek delta and effectiveness of countermeasures, Tr. Geogr. O-va Resp. Dagest., 2013, vol. 41, pp. 51–54.
Aleksevskii, N.I., Samokhin, M.A., and Sidorchuk, A.Yu., Floods and dangerous riverbed processes in the Terek Delta, in 22-e Mezhvuzovskoe soveshchanie po probleme erozionnykh, ruslovykh, i ust’evykh protsessov. Doklady i soobshcheniya (22nd Interuniversity Meeting on the Problem of Erosion, Channel, and Estuarine Processes. Reports and Brief Communications), Novocherkassk, 2007, pp. 18–31.
Baidin, S.S., Skriptunov, N.A., and Shteinman, B.S., Gidrologiya ust’evykh oblastei rek Tereka i Sulaka (Hydrology of Terek and Sulak Mouth Areas), Moscow: Gidrometeoizdat, 1971.
Belyaev, I.P., Gidrologiya del’ty Tereka (Hydrology of the Terek Delta), Moscow: Gidrometeoizdat, 1963.
Belyaev, I.P., Main features of the hydrology of the Terek mouth, Tr. Okeanogr. Kom., Akad. Nauk SSSR, 1960, vol. 6. pp. 75–85.
Berg, L.S., Istoriya velikikh russkikh geograficheskikh otkrytii (pereizdanie) (History of the Great Russian Geographical Discoveries (Reedition)), Moscow: EKSMO, 2011.
Vodno-bolotnye ugod’ya Rossii. Tom 6. Vodno-bolotnye ugod’ya Severnogo Kavkaza (Wetlands of Russia. Volume 6. Wetlands of the North Caucasus), Mishchenko, A.L., Ed., Moscow: Wetlands International, 2006.
Vodnye resursy Dagestana: sostoyanie i problemy (Water Resources of Dagestan. State and Problems), Makhachkala, 1996.
Gidrologiya del’ty i ust’evogo vzmor’ya Kubani (Hydrology of the Delta and Seashore Estuary of the Kuban River), Mikhailov, V.N., Magritsky, D.V., and Ivanova, A.A., Eds., Moscow: GEOS, 2010.
Gidrologiya ust’ev rek Tereka i Sulaka (Hydrology of Terek and Sulak Mouths), Kosarev, A.N. and Mikhailov, V.N., Eds., Moscow: Nauka, 1993.
Gorelits, O.V., Zemlyanov, I.V., Pavlovskii, A.E., Sapozhnikova, A.A., Postavik, P.V., and Yagotintsev, V.N., Catastrophic floods in the delta of the Terek River in 2002 and 2005, in Tr. Mezhd. Nauchn. Konf. “Ekstremal’nye gidrologicheskie sobytiya v Aralo-Kaspiiskom regione,” (Proc. Int. Sci. Conf. “Extreme Hydrological Events in Aral–Caspian Region”), Moscow, 2006, pp. 144–148.
Gorelits, O.V. and Zemlyanov, I.V., Strategic analysis and forecast of the Terek river delta development, Tr. Geogr. O-va Resp. Dagest., 2013, vol. 41, pp. 55–61.
Demin, D.Z., Current status of fish stocks in the lower reaches of the Terek River, Tr. 2-oi Nauchn. Sess. Dagest. Nauchno-Issled. Bazy Akad. Nauk SSSR (Proc. 2nd Sci. Sess. Acad. Sci. USSR), Makhachkala, 1949, pp. 245–258.
Dmitriev, N.A., On the current status of fishing in the lower reaches of the Terek River, Izv. Dagest. Ikhtiol. Lab., 1929, vol. 1, pp. 77–96.
Zavadskii, A.S., Samokhin, M.A., and Morozova, E.A., Study of the current morphodynamics of the mouth area of the Terek River for developing a new strategy for hydroecological safety in the riverine areas, in Chetvertye Vinogradovskie chteniya. Gidrologiya ot poznaniya k mirovozzreniyu. Sbornik dokladov (Fourth Vinogradov Readings. Hydrology from Cognition to Ideology. Abstracts), SPb., 2020, pp. 256–261.
Zemlyanov, I.V., Gorelits, O.V., and Postavik, P.V., Formation of new hydrological conditions in the mouth area of the Terek River, in Minimizatsiya vrednogo vozdeistviya vod v period polovodiii pavodkov, povyshenie effektivnosti vedeniya monitoringa vodnykh ob’’ektov, vodokhozyaistvennykh sistem i sooruzhenii: Sb. Statei Vseros. Nauchno-Prakt. Konf. (Minimizing Harmful Water Effects during High-Water and Flood Periods. Increasing the Efficiency of Monitoring of Water Bodies and Water Management Systems and Facilities: Collect. Artic. All-Russ. Sci.-Pract. Conf.), Makhachkala: Izd. Donskoi Gos. Tekh. Univ., 2006, pp. 9—15.
Kaplin, P.A. and Selivanov, A.O., Izmeneniya urovnya morei Rossii i razvitie beregov: proshloe, nastoyashchee i budushchee (Water Level Variations in Russian Seas and Their Shore Development: the Past, Present, and Future), Moscow: GEOS, 1999.
Kravtsova, V.I., Ilyukhina, Yu.A., The evolution of the eastern part of the Terek mouth area in the period of the Caspian Sea level rise: mapping based on aerospace materials, Water Resour., 2002, vol. 29, no. 1, pp. 43–54.
Litvinov, A.A., About changes in the current of the Terek River and coasts of the Caspian Sea from 1841 to 1846, Zap. Kavk. Otd. Ross. Geogr. O-va, 1864, vol. 6, pp. 83–96.
Mirzoev, M.Z., Fishery significance of Agrakhan Bay in present-day conditions, Cand. Sci. (Biol.) Dissertation, Makhachkala: Dagest. Kasp. Nauchno-Issled. Inst. Rybn. Khoz., 1983.
Mikhailov, V.N. and Mikhailova, V.N., Many-year channel deformations in mouth areas of the Terek and Sulak rivers as affected by the Caspian Sea Level fluctuations, Water Resour., 1998, vol. 25, no. 4, pp. 353–362.
Mikhailov, V.N., Rogov, M.M., Makarova, T.A., and Polonskii, V.F., Dinamika gidrograficheskoi seti neprilivnykh ust’ev rek (Dynamics of the Hydrographic Network of Nontidal River Mouths), Moscow: Gidrometeoizdat, 1977.
Mikheev, N.N., Kadomskii, A.M., Maksimov, Yu.A., and Chernousov, I.I., Water management, hydrological, and fishery problems of Terek River basin, in Vodnye resursy basseina r. Terek i ikh ispol’zovanie (Water Resources of Terek River Basin and Their Use), Rostov-on-Don: Yuzhgiprovodkhoz, 1983, pp. 3–17.
Ozero Yuzhnyi Agrakhan: problemy ekologicheskoi reabilitatsii (Lake Southern Agrakhan: Problems of Environmental Remediation), El’darov, E.M. and Guruev, M.A., Moscow: Makhachkala, 2014.
Pushchin, N.L., Kaspiiskoe more: gidrograficheskoe opisanie i rukovodstvo dlya plavaniya: s 7 kartami na 11 tablitsakh (Caspian Sea: Hydrographic Description and Sailing Guide with Seven Maps on 11 Tables), SPb.: Gidrogr. Dep., 1877.
Rytel’, M.F., Otchet ob izyskaniyakh 1901–1903 gg. v nizov’yakh Tereka (Report on 1901–1903 Explorations in the Lower Reaches of the Terek River), SPb.: Izd. Minist. Zemled. Gos. Imushch., 1903.
Rychagov, G.I., Age of the Terek delta, Tr. Okeanogr. Kom., Akad. Nauk SSSR, 1960, vol. 6 (Study of River Estuaries), pp. 85–88.
Rychagov, G.I., Obshchaya geomorfologiya (General Geomorphology), Moscow: Nauka, 2006.
Rychagov, G.I., The sea-level regime of the Caspian Sea during the last 10 000 years, Vestn. Mosk. Univ., Ser. 5: Geografiya, 1993a, no. 2, pp. 38–49.
Ust’ya rek Kaspiiskogo regiona: istoriya formirovaniya, sovremennye gidrologo-morfologicheskie protsessy i opasnye yavleniya (The Mouths of the Rivers of the Caspian Region: the History of Formation, Modern Hydrological-morphological Processes, and Dangerous Hydrological Phenomena), Mikhailov, V.N., Moscow: GEOS, 2013.
Shiklomanov, I.A., Antropogennye izmeneniya vodnosti rek (Anthropogenic Changes of Water Content of the Rivers), Leningrad: Gidrometeoizdat, 1979.
El’darov, E.M., History of hydro-reclamation activities in the wellhead area of the Terek River, Tr. Geogr. O-va Resp. Dagest., 1996, vol. 24, pp. 77–80.
Ardli, E.R. and Wolff, M., Land use and land cover change affecting habitat distribution in the Segara Anakan lagoon, Java, Indonesia, Reg. Environ. Change, 2009, no. 9, pp. 235–243.
https://earthexplorer.usgs.gov/. Cited October 15, 2020.
Mikhailov, V.N., Magritsky, D.V., Kravtsova, V.I., Mikhailova, M.V., and Isupova, M.V., The response of river mouths to large-scale variations in sea level and river runoff: case study of rivers flowing into the Caspian Sea, Water Resour., 2012, vol. 39, no. 1, pp. 11–43.
Rp5.ru. Cited October 15, 2020.
Funding
This study was supported by the West-Caspian Basin Water Management Board and Expert Laboratory “Hydroinformation Systems”; within the framework of the state budgetary topic 121051400038-1 and cooperation with the Institute of Water Problems (Russian Academy of Sciences), Caspian Research Institute of Fisheries, and State Reserve “Dagestansky”; as part of the work of the Interdisciplinary Scientific and Educational School of Moscow State University “The Future of the Planet and Global Environmental Changes.”
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Magritsky, D.V., Samokhin, M.A., Goncharov, A.V. et al. Features and Factors of Hydrological and Morphological Changes in the Agrakhan Bay at the Mouth of the Terek River in the 20th–Early 21st Centuries. Water Resour 49, 845–859 (2022). https://doi.org/10.1134/S0097807822050098
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DOI: https://doi.org/10.1134/S0097807822050098