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| Titel |
Groundwater surface water interactions and the role of phreatophytes in identifying recharge zones |
| VerfasserIn |
T. S. Ahring, D. R. Steward |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 16, no. 11 ; Nr. 16, no. 11 (2012-11-09), S.4133-4142 |
| Datensatznummer |
250013563
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| Publikation (Nr.) |
 copernicus.org/hess-16-4133-2012.pdf |
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| Zusammenfassung |
| Groundwater and surface water interactions within riparian corridors
impact the distribution of phreatophytes that tap into groundwater
stores. The changes in canopy area of phreatophytes over time is
related to changes in depth to groundwater, distance from a stream or
river, and hydrologic soil group. Remote sensing was used to determine
the location of trees with pre-development and post-development aerial
photography over the Ogallala Aquifer in the central plains of the
United States. It was found that once the depth to groundwater becomes
greater than about 3 m, tree populations decrease as depth to
water increases. This subsequently limited the extent of phreatophytes
to within 700 m of the river. It was also found that
phreatophytes have a higher likelihood of growing on hydrologic soil
groups with higher saturated hydraulic conductivity. Phreatophytes
exist along portions of the Arkansas River corridor where significant
decreases in groundwater occurred as long as alluvium exists to create
perched conditions where trees survive dry periods. Significant
decreases (more that 50%) in canopy cover exists along river
segments where groundwater declined by more than 10 m,
indicating areas with good hydraulic connectivity between surface
water and groundwater. Thus, interpretation of changes in phreatophyte
distribution using historical and recent aerial photography is
important in delineating zones of enhanced recharge where aquifers
might be effectively recharged through diversion of surface water
runoff. |
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