We transformed the one???dimensional Richards' equation into a new equation that describes the velocity of moisture content values in an unsaturated soil under the actions of capillarity and gravity. We call this new equation the Soil Moisture Velocity Equation (SMVE). The SMVE consists of two ...
on the ensemble Kalman filter( En KF),the distributed hydrology-soil-vegetation model( DHSVM),microw ave radiative transform model( advanced integration equation model,AIEM) and optically semi-empirical model( temperature-vegetation dryness index,TVDI) for soil moisture content retrieval in bare soil....
2.2.1.1 Revised Universal Soil Loss Equation (RUSLE) General Description: The Revised Universal Soil Loss Equation (RUSLE) is a straightforward and an empirical model capable of predicting long term average annual rate of soil erosion on slopes using data on rainfall, soil type, topography...
The flow of water and heat is an interactive process, where temperature gradients affect the moisture potential and both liquid and vapor movement in soil (McInnes, 2002). Heat flow in soil can be described by the following equation:(1.4)Q=KtAdTdX Table 1.1. Average thermal properties of ...
The soil moisture prediction model to be used is CSIRO Atmosphere Biosphere Land Exchange (CABLE), a column model based on Richards' equation that simulates water and energy fluxes between a vertical profiles, land surface, vegetation and the atmosphere. This model is ideally suited to the ...
{\omega }\partial q/\partial p\right){dp}\), where\(\omega\)is the pressure vertical velocity, according to the mass continuity equation33, we identify the dynamic effect by analyzing the SM effects on both the horizontal wind velocity and the pressure vertical velocity throughout the ...
When we obtained the soil moisture content and its reflectance dataset, the thickness of the water layer can be calculated by Equation (5); then, the function of 𝑓(𝐿f(L) between SMCg and L also can be established. Finally, the SMCg can be estimated based on this function of 𝑓...
While considering various approaches, the van Genuchten–Mualem soil-hydraulic model (Equation (4)), assuming zero hysteresis, was selected to characterize the shape of the water retention curves [70]. This theoretical equation describes the relationship between capillary pressure, water content, and ...
as the treatment group, and no fertilizer measures were selected as the control group to assess the effect of fertilizer measures on maize yield, soil nutrients, soil water content and water use efficiency in terms of natural logarithmic response ratios (\(lnR\)) using the following equation: ...
Here we investigate the role of water in substrate-microbe connectivity and soil carbon cycling under extreme moisture conditions. We collected soils from Alaska, Florida, and Washington USA, and incubated them under Drought and Flood conditions. Drought had a stronger effect on soil respiration, ...