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- W4245016075 abstract "Abstract. Groundwater-fed irrigation has altered surface and groundwater interactions, calling for conjunctive management of surface water and groundwater resources in many areas, including the Republican River Basin (RRB) in Midwest of the US, where agriculture heavily depends on irrigation. The decreasing flow trend recorded at the RRB gauging stations since 1950s reflects the synthetical effect of dynamic interactions between surface water and groundwater systems, which has been enhanced by groundwater pumping and irrigation return flow. This study uses a systematic modeling approach to analyze the conjunctive effects of pumping and return flow on streamflow. A watershed management model, Soil and Water Assessment Tool (SWAT), is modified and established for the Frenchman Creek Basin (FCB), a sub-basin of RRB, to examine the causes of streamflow changes. The baseflow component in SWAT is linked to aquifer storage so that the model can simulate the combined effect of groundwater pumping and irrigation return flow on natural streamflow. Results show that irrigation has not only depleted streamflow but also changed the flow pattern and seasonal variability. The changes can be decomposed into decrease in the slow component (baseflow) and increase in the fast components (surface and subsurface flow). Since the fast components are subject to higher variability than the slow component, the annual streamflow variability is amplified. Agricultural water use in this region also has changed the groundwater storage seasonal regime from the pattern of summer-recharge and winter-discharge in the past to summer-discharge and winter-recharge at present. This challenges the existing groundwater modelling which usually assumes fixed recharge pattern and rates." @default.
- W4245016075 created "2022-05-12" @default.
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- W4245016075 date "2013-06-19" @default.
- W4245016075 modified "2023-10-03" @default.
- W4245016075 title "Analyzing streamflow changes: irrigation-enhanced interaction between aquifer and streamflow in the Republican River Basin" @default.
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- W4245016075 doi "https://doi.org/10.5194/hessd-10-7783-2013" @default.
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