摘要：Recent studies demonstrate strong interdependence between groundwater dynamics, land
surface water and energy fluxes over some regions, including significant negative correlation
between latent heat flux and groundwater depth. Other studies show that irrigation
increases latent heat flux and decreases the Bowen ratio (ratio of sensible to latent heat
flux), with subsequent feedbacks on local and regional climate. We use an integrated
hydrologic model to evaluate impacts of groundwater pumping, irrigation, and combined
pumping and irrigation on groundwater storage, land surface fluxes, and stream
discharge over the Little Washita River watershed in the Southern Great Plains of
North America. Pumping and irrigation are shown to impact simulated water
and energy fluxes at local and watershed scales, with the magnitude of impacts
governed by local water table depth. When pumping and irrigation are combined,
irrigation has a dominant impact on spatially distributed surface energy processes
while pumping has a dominant impact on basin-integrated hydrologic conditions.
