Thesis
INVESTIGATING THE UTILITY OF REMOTE SENSING TO EVALUATE DEEP GROUNDWATER STORAGE CHANGES
Washington State University
Master of Science (MS), Washington State University
01/2021
DOI:
https://doi.org/10.7273/000002409
Handle:
https://hdl.handle.net/2376/124904
Abstract
The common assumption that deep groundwater storage variations and interbasin lateral groundwater flow are a negligibly small component of the total water budget was tested using modelled, remotely sensed, and in-situ data. A total water budget using Gravity Recovery And Climate Experiment (GRACE) data was compared to a surface water budget derived from remotely sensed precipitation, evapotranspiration, and gauged streamflow to examine whether interbasin groundwater flow can be isolated using remote sensing tools. Additionally, GRACE observed changes in total water storage was disaggregated using data from the Global Land Data Assimilation System (GLDAS) to isolate groundwater storage anomalies and were compared to estimates of pumping in the Guarani Aquifer. Sen’s slope estimator and Mann-Kendall significance tests were used to evaluate groundwater storage trends. Head variations are calculated based on assumed partitioning of groundwater storage anomalies and used to demonstrate that nearly all monthly variations in groundwater storage are associated with storage changes in unconfined aquifers.Results of this study suggest that each of the six watersheds evaluated was experiencing net lateral groundwater flow out of the basin and that nearly all groundwater storage variations on the monthly timescale are associated with storage changes in shallow unconfined aquifers. It is further suggested that lateral groundwater flow in the Guarani Aquifer underlying the state of Sao Paulo is sufficiently large to partially offset pumping withdrawals.
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Details
- Title
- INVESTIGATING THE UTILITY OF REMOTE SENSING TO EVALUATE DEEP GROUNDWATER STORAGE CHANGES
- Creators
- Todd Keniry
- Contributors
- Alexandra McLarty (Advisor)Nicholas Engdahl (Committee Member)Timothy Ginn (Committee Member)
- Awarding Institution
- Washington State University
- Academic Unit
- Civil and Environmental Engineering, Department of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University
- Number of pages
- 72
- Identifiers
- 99900606753001842
- Language
- English
- Resource Type
- Thesis