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

Abstract

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 5 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 10 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 15 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.Hydrol. Earth Syst. Sci. Discuss., https://doi

An overview of the methods for evaluating the resilience of groundwater systems

“… [14] Groundwater restoration time after pumping Haw river basin, USA PIHM The restoration time of groundwater under transient pumping and different potential climate scenarios was regarded as an index of resilience. [72] Northern Ethiopia – The recovery of groundwater systems after exploitation was examined as a criterion for resilience. [43] The standardized groundwater level or discharge rate index Udaipur and Aravalli, India – Groundwater resilience index (GRI), which is actually based on the modified SPI, was employed.…”

“…The fully-coupled model of PIHM was developed by [72] in order to compute the restoration time of both surface water and groundwater under transient pumping and different potential climate scenarios in Haw river basin, USA. In fact, the restoration time was taken into regard as a criterion for resilience.…”