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Quantifying water volumes of small lakes in the inner Aral Sea Basin, Central Asia, and their potential for reaching water and food security

Conrad, Christopher and Kaiser, Björn Otto and Lamers, John (2016) Quantifying water volumes of small lakes in the inner Aral Sea Basin, Central Asia, and their potential for reaching water and food security. Environmental Earth Sciences, 75 (952), pp. 1-16. Springer. DOI: 10.1007/s12665-016-5753-8 ISSN 1866-6280

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Official URL: http://link.springer.com/article/10.1007/s12665-016-5753-8

Abstract

In the inner Aral Sea Basin of Central Asia, numerous small lakes scattered over the irrigated landscape supply diverse ecosystem services for humans and nature. This study aimed to estimate the water volumes and assess the potentials of these small lakes for instance as irrigation reserve during the ever-recurring periods of water scarcity in the ecologically endangered Amudarya Delta. Bathymetric measurements gathered in the Khorezm region, Northwest Uzbekistan, permitted developing a statistical relationship between the surface and volume of the lakes. Landsat satellite data enabled for classifying the water bodies and hence deriving lake volumes over the study area. In 2002, the lakes stored ~0.032 km3 water during the winter season, but ~0.057 km3 during the main, 5–6 months spanning irrigation period. The area-wide increase in lake volumes during the irrigation period underlined the magnitude to which the currently practiced, inefficient use of irrigation water, produces excess water that in turn contributes to the existence of the small, mesotrophic lakes. Based on crop water requirements, calculations showed that the reuse of lake water may compensate for water-scarce situations, albeit to a certain extend only. An increased share (13 % above average) of water-intensive rice fields in the vicinity of the lakes substantiated that some lakes are already used in this way. It is argued that, in case of sufficient water quality, as indicated by other studies, more targeted exploration of such lake water can help simultaneously both, increasing food and water security of the households surrounding the lakes and safeguarding a supply to maintain different ecosystem functions. Integrated management of all water resources may reduce excess irrigation water supply to the region, which in turn may lessen the dependency of Central Asian downstream countries on transboundary water and supply water resources for the ecosystems in the river deltas.

Item URL in elib:https://elib.dlr.de/109146/
Document Type:Article
Title:Quantifying water volumes of small lakes in the inner Aral Sea Basin, Central Asia, and their potential for reaching water and food security
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Conrad, Christopherchristopher.conrad (at) uni-wuerzburg.deUNSPECIFIED
Kaiser, Björn OttoUNSPECIFIEDUNSPECIFIED
Lamers, Johncenter for development research (zef)UNSPECIFIED
Date:30 May 2016
Journal or Publication Title:Environmental Earth Sciences
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:75
DOI :10.1007/s12665-016-5753-8
Page Range:pp. 1-16
Publisher:Springer
ISSN:1866-6280
Status:Published
Keywords:Central Aisa, Amudarya Delta, Remote sensing, Water security Irrigation management
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Geowissenschaftl. Fernerkundungs- und GIS-Verfahren
Location: Oberpfaffenhofen
Institutes and Institutions:German Remote Sensing Data Center
Deposited By: Wöhrl, Monika
Deposited On:07 Dec 2016 13:05
Last Modified:06 Sep 2019 15:20

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