scholarly journals Non-Contact Prediction of Soil Moisture Profiles using Radio Wave Reflection

2005 ◽  
Author(s):  
Needham ◽  
Duane L. ◽  
Weckler ◽  
Paul R. ◽  
Bunting ◽  
...  
Keyword(s):  
Soil Moisture ◽  
Radio Wave ◽  
Wave Reflection ◽  
Contact Prediction ◽  
Moisture Profiles

Soil moisture profiles from multifrequency radar data at basin scale

Meccanica ◽  
1996 ◽  
Vol 31 (1) ◽  
pp. 59-72 ◽  
Author(s):  
O. Bolognani ◽  
M. Mancini ◽  
R. Rosso
Keyword(s):  
Soil Moisture ◽  
Radar Data ◽  
Basin Scale ◽  
Multifrequency Radar ◽  
Moisture Profiles

Role of radio wave reflection during radio occultation by the solar corona

1985 ◽  
Vol 28 (7) ◽  
pp. 549-556 ◽  
Author(s):  
A. I. Kucheryavenkov ◽  
A. G. Pavel'ev ◽  
S. N. Rubtsov ◽  
O. I. Yakovlev
Keyword(s):  
Solar Corona ◽  
Radio Wave ◽  
Radio Occultation ◽  
Wave Reflection

Unravelling the complex interactions between root development and soil moisture profiles in the soil-root-system

2020 ◽  
Author(s):  
Debora Cynthia Maan ◽  
Marie-claire ten Veldhuis ◽  
Bas van de Wiel
Keyword(s):  
Soil Moisture ◽  
Root System ◽  
Coupled System ◽  
Rooting Depth ◽  
Infiltration Capacity ◽  
Complex Interactions ◽  
Trade Offs ◽  
Typical Behaviour ◽  
Moisture Profiles ◽  
Insight Into

<p>We  study  the coupled  action of  water  uptake  and root  development  of  maize  in Rhizotrons under greenhouse conditions. Questions we aim to answer are: What is the effect of a vertical soil moisture gradient on the root growth? How does the root structure in turn influence soil moisture? Do constant  irrigation  quantities and depths eventually lead  to  constant  root  distributions and soil moisture profiles?</p><p>We apply highly controlled subsurface irrigation schemes in potting soil-sand mixtures and measure the real-time response of the interdepending soil moisture fields and root structures.</p><p>Following a top-down approach, in which the overall behaviour of the coupled system is carefully investigated and described, we aim to unravel the complex soil-root-interaction system. Looking at the occurrence of steady states and continuities sheds light on the type of the underlying feedback loops, which in turn provides insight into the fundamental processes that underlie the typical behaviour. We are particularly interested in trade-offs between the development of rooting depth and rooting density (including its dependency on soil moisture profiles) and the coupled effect of roots and root structures on the infiltration capacity of the soil-root-system. Preliminary results suggest the possibility of an enhancing feedback loop between these processes. </p><p>The next step will be to develop a numerical model that incorporates the interactions that were identified experimentally. The model will allow us to study the behavior and sensitivities of the system in more detail.</p><p> </p>

scholarly journals MUREX: a land-surface field experiment to study the annual cycle of the energy and water budgets

1999 ◽  
Vol 17 (6) ◽  
pp. 838-854 ◽  
Author(s):  
J.-C. Calvet ◽  
P. Bessemoulin ◽  
J. Noilhan ◽  
C. Berne ◽  
I. Braud ◽  
...  
Keyword(s):  
Soil Moisture ◽  
Annual Cycle ◽  
Land Surface ◽  
Surface Soil ◽  
Surface Soil Moisture ◽  
Local Climate ◽  
Long Period ◽  
Surface Field ◽  
Moisture Profiles ◽  
Meteorological Models

Abstract. The MUREX (monitoring the usable soil reservoir experimentally) experiment was designed to provide continuous time series of field data over a long period, in order to improve and validate the Soil-vegetation-Atmosphere Transfer (SVAT) parameterisations employed in meteorological models. Intensive measurements were performed for more than three years over fallow farmland in southwestern France. To capture the main processes controlling land-atmosphere exchanges, the local climate was fully characterised, and surface water and energy fluxes, vegetation biomass, soil moisture profiles, surface soil moisture and surface and soil temperature were monitored. Additional physiological measurements were carried out during selected periods to describe the biological control of the fluxes. The MUREX data of 1995, 1996, and 1997 are presented. Four SVAT models are applied to the annual cycle of 1995. In general, they succeed in simulating the main features of the fallow functioning, although some shortcomings are revealed.Key words. Hydrology (evapotranspiration; soil moisture; water-energy interactions).

scholarly journals State and bias estimation for soil moisture profiles by an ensemble Kalman filter: Effect of assimilation depth and frequency

2007 ◽  
Vol 43 (6) ◽  
Author(s):  
Gabriëlle J. M. De Lannoy ◽  
Paul R. Houser ◽  
Valentijn R. N. Pauwels ◽  
Niko E. C. Verhoest
Keyword(s):  
Soil Moisture ◽  
Kalman Filter ◽  
Ensemble Kalman Filter ◽  
Bias Estimation ◽  
Filter Effect ◽  
Moisture Profiles
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