EGU2020-1827
https://doi.org/10.5194/egusphere-egu2020-1827
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Detect groundwater storage in an island watershed by GRACE gravimetry

Chung-Chieh Huang1, Hong-Ru Lin2, Jyun-Lin Chen3, Shao-Yang Huang3, Jet-Chau Wen3,4, Jen-Feng P Yeh5, and Ben Jarihani6
Chung-Chieh Huang et al.
  • 1National Yunlin University of Science and Technology, Department and graduate school of safety health and environmental engineering, Douliou, Yunlin, Taiwan (zoids51220@gmail.com)
  • 2Graduate School of Engineering Science and Technology, National Yunlin University of Science and Technology, 123, Section 3, University Road, Douliou, Yunlin 64002, Taiwan (R.O.C.)
  • 3Research Center for Soil & Water Resources and Natural Disaster Prevention (SWAN), National Yunlin University of Science and Technology, 123, Section 3, University Road, Douliou, Yunlin 64002, Taiwan (R.O.C.)
  • 4Department and Graduate School of Safety Health and Environmental Engineering, National Yunlin University of Science and Technology, 123, Section 3, University Road, Douliou, Yunlin 64002, Taiwan (R.O.C.)
  • 5Monash University Malaysia, Jalan Lagoon Selatan, Bandar Sunway, 47500 Subang Jaya, Selangor, Malaysia
  • 6University of the Sunshine Coast, 90 Sippy Downs Dr, Sippy Downs QLD 4556, Australia

         Since the successful launch of the Gravity Recovery and Climate Experiment (GRACE) on March 17th, 2002, a number of scientists have adopted satellite gravimetry for the detection of variations on terrestrial water storage (TWS). Use of high-precision GRACE gravimetry presents advantages in hydrogeologic studies, such as providing accurate estimates of currents and gravity fields. Many studies have proven that the high-precision GRACE gravimetry can observe large-scale (over 50,000 km2) variations in groundwater storage (GWS). However, relatively few studies conducted using satellite gravimetry have focused on scales smaller than 5,000 km2.

        The purpose of this study is to investigate the potential for using GRACE gravimetry to observe small-scale variations in GWS specifically, this paper presents a case study of the Zhoushui River alluvial fan (~2,560 km2) in central Taiwan as an example of how well GRACE data compare to field-based data for ascertaining small-scale variations in GWS. Field measurements of groundwater level in 52 observation wells (2002-2017) were used to analyze variations in GWS. Results of this field-based analysis were compared to results obtained using the GWS data (2002-2017) obtained by GRACE gravimetry. This comparison allowed us to evaluate the similarities and differences in both methods as well as to prove the feasibility of using GRACE gravimetry in small-scale regions. Results of our comparative analysis indicate that water resources in small watershed can be successfully managed using gravimetric data collected by GRACE satellite.

 

Keywords: Groundwater storage, GRACE, Watershed

How to cite: Huang, C.-C., Lin, H.-R., Chen, J.-L., Huang, S.-Y., Wen, J.-C., Yeh, J.-F. P., and Jarihani, B.: Detect groundwater storage in an island watershed by GRACE gravimetry, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-1827, https://doi.org/10.5194/egusphere-egu2020-1827, 2019

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