Investigation of correlation of the variations in land subsidence (detected by continuous GPS measurements) and methodological data in the surrounding areas of Lake Urmia

Lake Urmia, a salt lake in the north-west of Iran, plays a valuable role in the environment, wildlife and econ- omy of Iran and the region, but now faces great challenges for survival. The Lake is in immediate and great danger and is rapidly going to become barren desert. As a result, the increasing demands upon groundwater resources due to expanding metropolitan and agricultural areas are a seri- ous challenge in the surrounding regions of Lake Urmia. The continuous GPS measurements around the lake illus- trate significant subsidence rate between 2005 and 2009. The objective of this study was to detect and specify the non- linear correlation of land subsidence and temperature ac- tivities in the region from 2005 to 2009. For this purpose, the cross wavelet transform (XWT) was carried out between the two types of time series, namely vertical components of GPS measurements and daily temperature time series. The significant common patterns are illustrated in the high pe- riod bands from 180-218 days band ( 6-7 months) from September 2007 to February 2009. Consequently, the satel- lite altimetry data confirmed that the maximum rate of linear trend of water variation in the lake from 2005 to 2009, is associated with time interval from September 2007 to Febru- ary 2009. This event was detected by XWT as a critical in- terval to be holding the strong correlation between the land subsidence phenomena and surface temperature. Eventually the analysis can be used for modeling and prediction pur- poses and probably stave off the damage from subsidence phenomena.

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