Abstract

MARIN-SOSA, Ma. Isabel et al. Time Modeling of Soil Moisture Changes Using Remote Sensing. Terra Latinoam [online]. 2011, vol.29, n.3, pp.299-307. ISSN 2395-8030.

Time modeling of the changes in soil moisture requires the knowledge of the soil hydraulic properties. To know the rainfall-runoff relationship in plots or hydrological basins, it is required to evaluate the soil moisture in spatially and exhaustive terms and with short intervals of time, a task practically impossible in operational applications of the hydrological models. The use of remote sensing, in reflectance measurements, enable to obtain information with the requirements defined in the operational practice. Thus, in this paper we present the results of an experiment in runoff plots using a rainfall simulator. In this experiment the temporal evolution of reflectance was evaluated using a constant energy source during the drying cycle. The experimental data shown that the use of a linear time reflectance model, to estimate the changes in the soil moisture, gave good results and it allowed its parameterization using only two correlated variables.

Keywords : reflectance-moisture soil relation; time modeling; soil reflectance; rainfall simulator.