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<front>
<journal-meta>
<journal-id journal-id-type="publisher">HESS</journal-id>
<journal-title-group>
<journal-title>Hydrology and Earth System Sciences</journal-title>
<abbrev-journal-title abbrev-type="publisher">HESS</abbrev-journal-title>
<abbrev-journal-title abbrev-type="nlm-ta">Hydrol. Earth Syst. Sci.</abbrev-journal-title>
</journal-title-group>
<issn pub-type="epub">1607-7938</issn>
<publisher><publisher-name>Copernicus Publications</publisher-name>
<publisher-loc>Göttingen, Germany</publisher-loc>
</publisher>
</journal-meta>
<article-meta>
<article-id pub-id-type="doi">10.5194/hess-18-493-2014</article-id>
<title-group>
<article-title>Analyzing streamflow changes: irrigation-enhanced interaction between aquifer and streamflow in the Republican River basin</article-title>
</title-group>
<contrib-group><contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Zeng</surname>
<given-names>R.</given-names>
<ext-link>https://orcid.org/0000-0003-3229-3146</ext-link>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Cai</surname>
<given-names>X.</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
</contrib>
</contrib-group><aff id="aff1">
<label>1</label>
<addr-line>Ven Te Chow Hydrosystems Laboratory, Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois, USA</addr-line>
</aff>
<pub-date pub-type="epub">
<day>10</day>
<month>02</month>
<year>2014</year>
</pub-date>
<volume>18</volume>
<issue>2</issue>
<fpage>493</fpage>
<lpage>502</lpage>
<permissions>
<copyright-statement>Copyright: &#x000a9; 2014 R. Zeng</copyright-statement>
<copyright-year>2014</copyright-year>
<license license-type="open-access">
<license-p>This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit <ext-link ext-link-type="uri"  xlink:href="https://creativecommons.org/licenses/by/3.0/">https://creativecommons.org/licenses/by/3.0/</ext-link></license-p>
</license>
</permissions>
<self-uri xlink:href="https://hess.copernicus.org/articles/18/493/2014/hess-18-493-2014.html">This article is available from https://hess.copernicus.org/articles/18/493/2014/hess-18-493-2014.html</self-uri>
<self-uri xlink:href="https://hess.copernicus.org/articles/18/493/2014/hess-18-493-2014.pdf">The full text article is available as a PDF file from https://hess.copernicus.org/articles/18/493/2014/hess-18-493-2014.pdf</self-uri>
<abstract>
<p>Groundwater-fed irrigation has altered surface and groundwater interactions
in the Republic River basin (RRB) in the midwestern   United States, where
agriculture heavily depends on irrigation. The decreasing flow trend
recorded at the RRB gauging station since the 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, the Soil and Water Assessment Tool (SWAT), is modified and
established for the Frenchman Creek basin (FCB), a subbasin 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
effects 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
&quot;summer recharge and winter discharge&quot; in the past to &quot;summer discharge
and winter recharge&quot; at present. This challenges the existing groundwater
modeling, which usually assumes fixed recharge pattern and rates.</p>
</abstract>
<counts><page-count count="10"/></counts>
</article-meta>
</front>
<body/>
<back>
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