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| Titel |
Modelling overbank flood recharge at a continental scale |
| VerfasserIn |
R. Doble, R. Crosbie, L. Peeters, K. Joehnk, C. Ticehurst |
| 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 ; 18, no. 4 ; Nr. 18, no. 4 (2014-04-03), S.1273-1288 |
| Datensatznummer |
250120322
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| Publikation (Nr.) |
 copernicus.org/hess-18-1273-2014.pdf |
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| Zusammenfassung |
| Accounting for groundwater recharge from overbank flooding is required to
reduce uncertainty and error in river-loss terms and groundwater sustainable-yield calculations. However, continental- and global-scale models of surface
water–groundwater interactions rarely include an explicit process to
account for overbank flood recharge (OFR). This paper upscales previously
derived analytical equations to a continental scale using national soil
atlas data and satellite imagery of flood inundation, resulting in recharge
maps for seven hydrologically distinct Australian catchments. Recharge for
three of the catchments was validated against independent recharge estimates
from bore hydrograph responses and one catchment was additionally validated
against point-scale recharge modelling and catchment-scale change in
groundwater storage. Flood recharge was predicted for four of the seven
catchments modelled, but there was also unexplained recharge present from
the satellite's flood inundation mapping data. At a catchment scale, recharge
from overbank flooding was somewhat under-predicted using the analytical
equations, but there was good confidence in the spatial patterns of flood
recharge produced. Due to the scale of the input data, there were no
significant relationships found when compared at a point scale. Satellite-derived flood inundation data and uncertainty in soil maps were the key
limitations to the accuracy of the modelled recharge. Use of this method to
model OFR was found to be appropriate at a catchment to continental scale,
given appropriate data sources. The proportion of OFR was found to be at
least 4% of total change in groundwater storage in one of the catchments
for the period modelled, and at least 15% of the riparian recharge.
Accounting for OFR is an important, but often overlooked, requirement for
closing water balances in both the surface water and groundwater domains. |
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