TY  - THES
AU  - Qu, Wei
TI  - Characterization of soil water content variability at the catchment scale using sensor network and stochastic modelling
VL  - 271
PB  - Universität Bonn
VL  - Dr.
CY  - Jülich
M1  - FZJ-2015-04872
SN  - 978-3-95806-067-8
T2  - Schriften des Forschungszentrums Jülich Reihe Energie & Umwelt / Energy & Environment
SP  - XVI, 123 S.
PY  - 2015
N1  - Universität Bonn, Diss., 2015
AB  - Wireless sensor network technology has recently been used for high spatial and temporal resolution soil water content measurements to facilitate better understanding of hydrological processes in catchment scale. Its performance strongly depends on the quality of the sensorsand the number of sensor nodes. In the first paper, the newly developed SPADE soil water content sensor was calibrated using a two-step laboratory-based procedure using dielectric reference liquids. The sensor accuracy was evaluated in terms of sensor-to-sensor variability and temperature effect. Using sensor-specific calibration significantly improved the estimation of apparent dielectric permittivity as compared to using a universal calibration function. The transferability of the temperature correction function from reference liquids to soils was successful and has been verified with undisturbed soil samples. A site-specific petrophysical model (complex refraction index model, CRIM) was used to convert apparent dielectric permittivity into soil water content using 15 soil samples from the Rollesbroichcatchment, with RMSE values of 0.028, 0.025, and 0.022 cm$^{3}$cm$^{-3}$ for 5, 20, and 50 cm, respectively. [...]
LB  - PUB:(DE-HGF)11 ; PUB:(DE-HGF)3
UR  - https://juser.fz-juelich.de/record/202688
ER  -