Weitere Kapitel dieses Buchs durch Wischen aufrufen
This paper discusses the influence of economic development in the basin of Lake Sevan. It shows that the decrease of lake’s water level has led to changes in the hydrological regime. The development in the basin has caused disruption of thermal and hydro-chemical regimes of the lake, deteriorating the water quality and increasing the water turbidity. The circulation of biological and chemical species has changed as well.
Studies of the chemical composition of the water were launched at the end of the nineteenth century, and the first salt balance was determined in the 1930s. According to routine observations, 1 l of the lake’s water contains about 0.7 g salt in ionic form, which has changed by about 5–10% as a result of the decrease of water level. There have been changes in the general mineralization that are related to the decrease of the water level and the magnitude of its flow.
In 1928–1930, well before artificial changes to the lake’s water level were realized, the total mineralization was 718.4 mg/l, while today it is 673 mg/l (1999–2002). The decrease of total general mineralization of lake water is strongly related to the massive outflow of salty water, which removed salts that have been accumulating in the lake for centuries.
The studies of separate components of Lake Sevan balance show that under conditions of the global climate warming, evaporation from the lake’s surface may reach up to 145 × 106 m3/annum. Averaging of the consequences of possible climate change on river runoff points at the possible decrease of water resources of the lake’s basin by −2.51% by the end of the first half of the twenty-first century.
It is hard to predict the future developments of these processes. However, the issue of Lake Sevan is not entirely settled as the ecosystem of the lake is damaged and is undergoing the process of eutrophication. The flora and fauna of the water and coast have undergone serious and irreversible changes.
Bitte loggen Sie sich ein, um Zugang zu diesem Inhalt zu erhalten
Sie möchten Zugang zu diesem Inhalt erhalten? Dann informieren Sie sich jetzt über unsere Produkte:
Liatti SJa (1932) The hydrochemical study of lake Sevan: materials on the researches of lake Sevan and its basin. Part IV, issue 2, Leningrad
Vardanian TG (1990) On several problems of mineralization and ion Structure of Lake Sevan water. Scientific notes of Yerevan State University, Natural Sciences, N 1(173), Yerevan, pp 140–145
Vardanian TG (1999) The condition of mineralization of the rivers of lake Sevan basin. In: Proceedings of the national academy of sciences of the RA, Earth Science, LII, N2–3, Yerevan, pp 97–100
Musaelian SM (1993) The ecology and economy of lake Sevan and its basin. Yerevan University Press, Yerevan 164 p (in Russian)
Gabrielian HK (1980) The pearl Sevan. “Hayastan” Press, Yerevan 135 p (in Armenian)
The biodiversity of Armenia, the first report . RA ministry of nature protection, Yerevan (1999), pp 13–15
Armenia: climate change problems/Collected articles, Issue I. Gabrielyan AH (ed). Yerevan: “Science” Press of National Academy of Science of RA (1999), 373 p
Vardanian TG (2009) Forecasting and evaluations of the runoff of rivers in lake Sevan basin in various scenarios of climate changes. Materials of all-Russian conference, dedicated to the 100-the anniversary of Professor O.A. Drozdov “Contemporary issues in climatology”, St-Petersburg, Russia, pp 47–48
- On Some Issues of the Anthropogenic Transformation of Water Ecosystems (Case Study of Lake Sevan)
- Springer Netherlands
- Chapter 29
Systemische Notwendigkeit zur Weiterentwicklung von Hybridnetzen