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Developing water quality maps of a hyper-saline lake using spatial interpolation methods

Authors: Somayeh Sima · Masoud Tajrishy
Owners: Somayeh Sima
Resource type:Composite Resource
Created:Nov 15, 2018 at 4:37 a.m.
Last updated: Nov 15, 2018 at 4:49 a.m. by Somayeh Sima


Urmia Lake, the second largest hyper-saline lake in the world, has experienced a significant drop in water level during the last decade. This study was designed to examine the water quality of Urmia Lake and to characterize the spatial heterogeneity and temporal changes of the physico-chemical parameters between October 2009 and July 2010. Two spatial interpolation methods, Inverse Distance Weighting (IDW) and Ordinary Kriging (OK), were used and compared with each other to derive the spatial distribution of ionic constituents as well as TDS and density along the lake. Results showed that the main dominant cations and anions in Urmia Lake were Na+, Mg++, K+, Ca++, Cl- , SO4--, and HCO3-, respectively. Although water quality of the lake is homogeneous with depth, it differs between the northern and southern parts. Water quality also varies seasonally, determined by river inflows and the lake bathymetry. Moreover, with the present salinity level, salt precipitation is likely in Urmia Lake and is becoming one of the principal factors determining the distribution of solutes within the lake. This study shows that the combined use of temporal and spatial water quality data improves our understanding of complex, large aquatic systems like Urmia Lake.

Subject Keywords

Urmia Lake; Water quality; Interpolation methods; Kriging; Cations; Anions

How to cite

Sima, S., M. Tajrishy (2018). Developing water quality maps of a hyper-saline lake using spatial interpolation methods, HydroShare, http://www.hydroshare.org/resource/83d48b89972a4e118e42b40d9e1377a3

This resource is shared under the Creative Commons Attribution CC BY.


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  • Sharable Resource  Shareable



 Coordinate System/Geographic Projection:  WGS 84 EPSG:4326
 Coordinate Units:  Decimal degrees
North Latitude
East Longitude
South Latitude
West Longitude


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The people or organizations that created the intellectual content of the resource.

Name Organization Address Phone Author Identifiers
Somayeh Sima Tarbiat Modares University, Tarbiat Modares University, Jalal Ale Ahmad Highway, Tehran, Iran. +1-435-512-7743
Masoud Tajrishy Sharif University of Technology


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