V.G. Margaryan. TEMPORAL CHANGES OF WINTER MINIMUM TEN-DAY RUNOFF OF SEVAN LAKE RIVERS BASIN

https://doi.org/10.15407/ugz2020.03.020
Ukr. geogr. z. 2020, N3:20-29
Authors: 

V.G. Margaryan - Yerevan State University, The Republic of Armenia.

Abstract: 

The purpose of this study is to analyze and assess the patterns of temporal changes in winter minimum ten-day flow rates in a number of long-term observations for rivers flowing into lake Sevan, as well as to analyze and evaluate patterns of temporal changes in winter air temperatures and precipitation within the lake Sevan basin. To carry out the work, the data of observations of 12 hydrological posts of the «Hydrometeorology and monitoring center» SNCO of the Ministry of Environment of the Republic of Armenia were used. All observed hydrological posts have a number of observations 40 years or more. The methods used in the work are: mathematical-statistical, extrapolation, interpolation, analysis, analogue and correlation. The regularities of changes in the 75% provision of the winter minimum ten-day runoff from the catchment areas are considered. The obtained dependencies can be used to obtain 75% provision of winter minimum ten-day flows of unexplored and little-studied rivers of the studied territory for a calendar year. A map of the distribution of the modul of the average minimum winter runoff for a ten-day with the lowest water content of 75% supply was constructed. It was found that there is a tendency for both the growth (58%) of the winter average ten-day minimum costs, and their decrease (42%). The rate of change of the winter average ten-day minimum flow rates is from -0,133 to +0,13 m3/s/10 years. On the Argichi river at Getashen point over the past 50 years there was an increase in the winter minimum ten-day runoff by 0.65 m3/s, and on the Lichk river at Lichk point – a decrease by 0,67 m3/s. Also considered the time course of average air temperatures and atmospheric precipitation for the winter period. It was found that there is a tendency towards an increase in air temperatures and atmospheric precipitation.

Key words: 
minimum ten-day expenses, security, temporary changes, Lake Sevan basin, Armenia
Pages: 
20-29
References: 

1. Vardanyan L.R., Azizyan L.V.(2014). Forecast of low-water season flow based on the underground water depletion curve on the example of the RA Rivers. Proceedings of State Engineering University of Armenia. Series Hydrology and hydraulic engineering. Iss. 17, 1, 18-26. [In Russian]. [Варданян Л.Р., Азизян Л.В. Прогноз меженного стока по кривой истощения запасов подземных вод на примере рек Республики Армения // Вестник ГИУА. Серия «Гидрология и гидротехника». 2014. Bып. 17. №1. C. 18-26.]
 
2. Vardanian T.G. (1991). The minimal flow of the river Argidji in winter and the methods of its calculation. Proceedings of the Yerevan State University, series Geology and Geography, 2, 150-156. [In Armenian]. [Варданян Т. Г. Зимний минимальный сток р. Аргичи и его расчет // Уч. зап. Ереван. гос. ун-та. Сер. Геология и География. 1991. № 2. C.150-156. (На армянском яз.)]
 
3. Surface water resources of the USSR. Vol. 9. The Araks River basin. Iss. 2. Ed A.P. Muranov. (1973). Leningrad, 472 p. [In Russian]. [Ресурсы поверхностных вод СССР. Том 9. Бассейн р. Аракса. Вып. 2. Под ред. А.П. Муранова. Ленинград, 1973, 472 с.]
 
4. Margaryan V.G., Davtyan T.M., Amroyan A.M., Churshudyan S.A., Sargsyan K.G., Matevosyan V.A. (2018). Analysis and assessment of changes in the winter minimum mean decadal water flow in the tributaries of lake Sevan. Contemporary issues of geography and geology. Dedicated to the 100th Anniversary of the Yerevan State University, International Conference Proceedings September 27-29, 2018, Yerevan. Yerevan, 242-246. [In Armenian]. [Анализ и оценка изменения зимних наименьших среднедекадных расходов воды притоков озера Севан / В.Г. Маргарян, Т.М. Давтян, А.М. Амроян, С.А. Хуршудян, К.Г. Саргсян, В.А Матевосян.// Современные задачи географии и геологии. (Мат-лы междунар. симпозиума, посвященного 100- летию основания Ереванского Гос. Ун-та, Факультет Географии и геологии, Ереван, 27-29 сентабря, 2018). 2018. C. 242-246. (На армянском яз.)]
 
5. Margaryan G.D., Avetisyan A.V., Poliakov A.V. (2020). Regularities of the spatio-temporal distribution of winter minimum ten-day runoff in rivers of lake sevan basin. Izvestiya Tula State University, Sciences of Earth, 1, 92-108. [In Russian]. [Маргарян В.Г., Аветисян Г.Д., Поляков А.В. Закономерности пространственно-временного распределения зимнего минимального декадного стока рек бассейна озера Севан // Изв. ТулГУ. Науки о Земле. 2020. Вып. 1. С. 92-108.]
https://doi.org/10.46689/2218-5194-2020-1-1-92-108
 
6. Muradyan Z.Z. (2014). Calculations and risk assessment of the extreme outcomes of the rivers of the Araks Basin of the Republic of Armenia. Thesis for the degree of candidate of geographical sciences.Yerevan, 32 p. [In Armenian]. [Мурадян З.З. Расчет и оценка риска экстремальных расходов рек бассейна Аракс Республики Армения. Автореф. дисс. ...канд. геогр. наук. Ереван. 2014. 32 с. (На армянском яз.)]
 
7. Shaginyan M.V., Mnatsakanyan B.P. (1982). About the possibility of forecasting low-flow runoff through the groundwater levels. Collected Works of the Yerevan GMO. Iss. 4, 36 - 39. [In Russian]. [Шагинян М.В., Мнацаканян Б.П. О возможности прогнозирования меженного стока по уровням грунтовых вод // Сборник работ Ереванской гидрометеорологической обсерватории. Вып. 4. 1982. C. 36-39.]
 
8. Vladimirov A.M. (1990). Hydrological calculations. Leningrad, 366 p. [In Russian]. [Владимиров А.М. Гидрологические расчеты. Ленинград, 1990. 366 с.]
 
9. Hydrography of the Armenian SSR. (1981). Yerevan, 177 p. [In Russian]. [Гидрография Армянской ССР. Ереван, 1981. 177 с.]
 
10. Frolova N.L., Belyakova P.A., Grigor'ev V.Yu., Sazonov A.A., and Zotov L.V. (2017). Many-year variations of river runoff in the selenga basin. Water Resources and the Regime of Water Bodies. Vol. 44, 3, 359-371. doi.org/10.1134/S0097807817030101
https://doi.org/10.1134/S0097807817030101
 
11. Rets E.P., Dzhamalov R.G., Kireeva M.B., Frolova N.L., Durmanov I.N., Telegina A.A., Telegina E.A., Grigoriev V.Y. (2018). Recent trends of river runoff in the North Caucasus. Geography, environment, sustainability, 11(3), 61-70.
https://doi.org/10.24057/2071-9388-2018-11-3-61-70