Evaluation of GRACE based groundwater storage change information at Konya Closed Basin Turkey using remote sensing and in situ measurements

Date

2016-12-12

Author

Yılmaz, Koray Kamil
Yılmaz, Mustafa Tuğrul

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The Konya Closed Basin (KCB) located in Central Anatolia, Turkey, is the primary grain producer in Turkey and covers an area of approximately 50000km2. The lack of sufficient surface water resources and recently changing crop patterns have led to over-exploitation of groundwater resources and resulted in significant drop in groundwater levels. For this reason monitoring of the groundwater storage change in this region is critical to understand the potential of the current water resources and to devise effective water management strategies to avoid further depletion of the groundwater resources. Therefore, the main objective of this study is to examine and assess the utility of the Gravity Recovery and Climate Experiment (GRACE) and the Global Land Data Assimilation System (GLDAS) to monitor and investigate the groundwater storage changes over the Konya Closed Basin. Groundwater storage changes are derived using GRACE and GLDAS data and then are compared with the groundwater changes derived from the monitoring wells. The results of the comparison indicate an acceptable agreement between GRACE, GLDAS and observed groundwater storage change during dry (2002-2008 period) and wet (2009-2015) periods. Additionally, consistent with existing drought literature, the results indicated that the study region exhibited remarkable drought conditions during 2007-2008 period. A temporal NDVI analysis showed that the sustained vegetation during dry periods is likely due to groundwater exploitation. This study shows that the GRACE/GLDAS datasets can be used to monitor the equivalent groundwater storage changes over a moderate size basin which is crucial for long-term effective water management strategies.

URI

https://hdl.handle.net/11511/77971

Conference Name

American Geophysical Union Fall Meeting 2016 (12 - 16 Aralık 2016)

Collections

Department of Geological Engineering, Conference / Seminar

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Citation Formats

K. K. Yılmaz and M. T. Yılmaz, “Evaluation of GRACE based groundwater storage change information at Konya Closed Basin Turkey using remote sensing and in situ measurements,” presented at the American Geophysical Union Fall Meeting 2016 (12 - 16 Aralık 2016), 2016, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/77971.