Abstract
Water is a scarce resource in many regions of the world. In all Central Asian countries, the society depends on the availability of water either for hydro-power generation or irrigation. Since the collapse of the Soviet Union and the separation into independent countries, water resources management became a critical and political issue. Public information on water resources is now unavailable for many lakes and reservoirs and the data exchange about in- and outflows or actual storage volumes is limited. While the initial purpose of radar altimetry has been to measure sea surface topography and sea level changes, it proved to be a suitable tool for inland water body monitoring and to partially provide data about lake and reservoir level changes. Using this technology, the water levels of the Toktogul, Kairakum and Shardara Reservoirs and Lake Aydarkol have been extracted from 1995 onward. Using external information the derived water levels have been converted into water volume changes. This study shows that since 2011 the available water volume decreased and the water from the Toktogul and Shardara Reservoirs are overused. In 2015 the stored water volume of the Toktogul Reservoir was almost at its lowest possible amount. Merely the Kairakum Reservoir with a smaller storage capacity is replenished every year. Likewise, a decrease of water level and volume of Lake Aydarkol is clearly visible for the past years.
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Acknowledgement
This work was carried out in the frame of the CAWa (Central Asian Water) project (www.cawa-project.net, Contract No. AA7090002), funded by the German Federal Foreign Office as part of the German Water Initiative for Central Asia (“Berlin Process”). We thank Alexandr Nikolayenko (Transboundary Water Management Programme in Central Asia, Almaty Office, Kazakhstan, Deutsche Gesellschaft für Internationale Zusammenarbeit (GIZ) GmbH) for information about the water usage regime in our study area. The excellent work of the Space Agencies (ESA, NASA, CNES) for the provision of radar altimetry data is acknowledged. We thank our colleagues Cornelia Zech and Katy Unger-Shayesteh from the CAWa project for the fruitful discussions. Lake and reservoir level data from this study is available through the CAWa Sensor Data Storage System (SDSS) at sdss.caiag.kg, the work of A. Zubovich (CAIAG, Kyrgyzstan) is highly appreciated. We thank also CAWater-Info for the provision of reservoir data.
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Schöne, T., Dusik, E., Illigner, J., Klein, I. (2017). Water in Central Asia: Reservoir Monitoring with Radar Altimetry Along the Naryn and Syr Darya Rivers. In: Freymueller, J.T., Sánchez, L. (eds) International Symposium on Earth and Environmental Sciences for Future Generations. International Association of Geodesy Symposia, vol 147. Springer, Cham. https://doi.org/10.1007/1345_2017_265
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DOI: https://doi.org/10.1007/1345_2017_265
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