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| Titel |
Integral quantification of seasonal soil moisture changes in farmland by cosmic-ray neutrons |
| VerfasserIn |
C. A. Rivera Villarreyes, G. Baroni, S. E. Oswald |
| 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 ; 15, no. 12 ; Nr. 15, no. 12 (2011-12-21), S.3843-3859 |
| Datensatznummer |
250013060
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| Publikation (Nr.) |
 copernicus.org/hess-15-3843-2011.pdf |
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| Zusammenfassung |
| Soil moisture at the plot or hill-slope scale is an important link between
local vadose zone hydrology and catchment hydrology. However, so far only a
few methods are on the way to close this gap between point measurements and
remote sensing. One new measurement methodology that could determine
integral soil moisture at this scale is the aboveground sensing of
cosmic-ray neutrons, more precisely of ground albedo neutrons. The present
study performed ground albedo neutron sensing (GANS) at an agricultural
field in northern Germany. To test the method it was accompanied by other
soil moisture measurements for a summer period with corn crops growing on
the field and a later autumn-winter period without crops and a longer period
of snow cover. Additionally, meteorological data and aboveground crop
biomass were included in the evaluation. Hourly values of ground albedo
neutron sensing showed a high statistical variability. Six-hourly values
corresponded well with classical soil moisture measurements, after
calibration based on one reference dry period and three wet periods of a few
days each. Crop biomass seemed to influence the measurements only to minor
degree, opposed to snow cover which has a more substantial impact on the
measurements. The latter could be quantitatively related to a newly
introduced field neutron ratio estimated from neutron counting rates of two
energy ranges. Overall, our study outlines a procedure to apply the ground
albedo neutron sensing method based on devices now commercially available,
without the need for accompanying numerical simulations and suited for
longer monitoring periods after initial calibration. |
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