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Discussion papers | Copyright
https://doi.org/10.5194/hess-2017-402
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 10 Aug 2017

Research article | 10 Aug 2017

Review status
This discussion paper is a preprint. It has been under review for the journal Hydrology and Earth System Sciences (HESS). A final paper in HESS is not foreseen.

Assessing the resiliency of surface water and groundwater systems under groundwater pumping

Seung Beom Seo1, Gnanamanikam Mahinthakumar2, Sankarasubramanian Arumugam2, and Mukesh Kumar3 Seung Beom Seo et al.
  • 1Department of Civil and Environmental Engineering, Institute of Engineering Research, Seoul National University, Seoul, South Korea
  • 2Department of Civil, Construction, and Environmental Engineering, North Carolina State University, Raleigh, North Carolina, USA
  • 3Nicholas School of Environment, Duke University, Durham, North Carolina, USA

Abstract. Since surface water and groundwater systems are fully coupled and integrated systems, increased groundwater withdrawal during drought may reduce groundwater discharges into the stream, thereby prolonging both systems’ recovery from drought. To analyze watershed response to basin-level groundwater pumping, we propose an uncertainty framework to understand the resiliency of groundwater and surface water systems using a fully-coupled hydrologic model under transient pumping. The proposed framework incorporates uncertainties in initial conditions to develop robust estimates of restoration times of both surface water and groundwater systems and quantifies how pumping impacts state variables such as soil moisture. Groundwater pumping impacts over a watershed were also analyzed under different pumping volumes and different potential climate scenarios. Our analyses show that groundwater restoration time is more sensitive to variability in climate forcings as opposed to changes in pumping volumes. After the cessation of pumping, streamflow recovers quickly in comparison to groundwater, which has higher persistence. Pumping impacts on various hydrologic variables were also discussed. Given that surface water and groundwater are inter-connected, optimal management of the both resources should be considered to improve the watershed resiliency under drought. Potential for developing optimal conjunctive management plans using seasonal-to-interannual climate forecasts is also discussed.

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Seung Beom Seo et al.
Seung Beom Seo et al.
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Our analyses show that groundwater sustainability is more sensitive to variability in climate as opposed to changes in pumping volumes. After the cessation of pumping, streamflow recovers quickly in comparison to groundwater. Given that surface water and groundwater are inter-connected, optimal management of the both resources should be considered to improve the watershed resiliency under drought.
Our analyses show that groundwater sustainability is more sensitive to variability in climate as...
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