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Verfasst von:Köhli, Markus [VerfasserIn]   i
 Schrön, Martin [VerfasserIn]   i
 Zreda, M. [VerfasserIn]   i
 Schmidt, Ulrich [VerfasserIn]   i
 Dietrich, P. [VerfasserIn]   i
 Zacharias, S. [VerfasserIn]   i
Titel:Footprint characteristics revised for field-scale soil moisture monitoring with cosmic-ray neutrons
Verf.angabe:M. Köhli, M. Schrön, M. Zreda, U. Schmidt, P. Dietrich, and S. Zacharias
E-Jahr:2015
Jahr:29 Jul 2015
Umfang:19 S.
Fussnoten:Gesehen am 15.07.2020
Titel Quelle:Enthalten in: Water resources research
Ort Quelle:[New York] : Wiley, 1965
Jahr Quelle:2015
Band/Heft Quelle:51(2015), 7, Seite 5772-5790
ISSN Quelle:1944-7973
Abstract:Cosmic-ray neutron probes are widely used to monitor environmental water content near the surface. The method averages over tens of hectares and is unrivaled in serving representative data for agriculture and hydrological models at the hectometer scale. Recent experiments, however, indicate that the sensor response to environmental heterogeneity is not fully understood. Knowledge of the support volume is a prerequisite for the proper interpretation and validation of hydrogeophysical data. In a previous study, several physical simplifications have been introduced into a neutron transport model in order to derive the characteristics of the cosmic-ray probe's footprint. We utilize a refined source and energy spectrum for cosmic-ray neutrons and simulate their response to a variety of environmental conditions. Results indicate that the method is particularly sensitive to soil moisture in the first tens of meters around the probe, whereas the radial weights are changing dynamically with ambient water. The footprint radius ranges from 130 to 240 m depending on air humidity, soil moisture, and vegetation. The moisture-dependent penetration depth of 15 to 83 cm decreases exponentially with distance to the sensor. However, the footprint circle remains almost isotropic in complex terrain with nearby rivers, roads or hill slopes. Our findings suggest that a dynamically weighted average of point measurements is essential for accurate calibration and validation. The new insights will have important impact on signal interpretation, sensor installation, data interpolation from mobile surveys, and the choice of appropriate resolutions for data assimilation into hydrological models.
DOI:doi:10.1002/2015WR017169
URL:Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.

Volltext: https://doi.org/10.1002/2015WR017169
 Volltext: https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1002/2015WR017169
 DOI: https://doi.org/10.1002/2015WR017169
Datenträger:Online-Ressource
Sprache:eng
Sach-SW:COSMOS detector
 energy spectrum
 neutron transport model
 soil water content
 spatially weighted average
 support volume
K10plus-PPN:1724797948
Verknüpfungen:→ Zeitschrift

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