Infiltration Parameters for Rangeland Soils

Abstract

Importent to the management of rangelonds is knowledge of the water intake properties of their soils end the effect of soil surface and anopy cover. Using a date base of rangeland infiltration runs covering a wide range of soil end cover conditions, 8 procedure incorpornting the effects of soil properties, soil surface cover, and vegetative anopy on the Green-Ampt hydreulic conductivity paremeter was developed. Test results indiate that the e&meted Green-Ampt peremeters provided good predictions of the mesn final infiltration r&s end volumes for a variety of soil-cover situetions.

Determination and Evaluation of the Parameters for the Green & AMPT Infiltration Equation in Some Agricultural Soils in Mexico

“…According to the results found in this research, the water retention curve must be used to obtain parameter as was done in the Retention curve method and this curve could be generated taking into consideration the physical properties of the soils as was done in reference [41], contemplating the sand, clay, and organic matter contents, and the bulk density from the soils representative of the country to minimize the costs of the studies. Another alternative could be the study of empirical functional relations to obtain directly the parameter in function of the contents of sand, clay and the porosity of the soil; these equations have to be specific for soil uses to improve the representativeness of their characteristics [15,42,43].…”

Optimal parameters for the Green-Ampt infiltration model under rainfall conditions

“…Because of their complexity, most of these functions require numerical integration. An exception is the power law function of Brook and Corey (1964), which has been used in a number of GA applications, notably by Rawls and coworkers (Rawls et al, 1989(Rawls et al, , 1983. In our study we used the van Genuchten (1980) function for K(ψ) and integrated Eq.…”

Event-based estimation of water budget components using a network of multi-sensor capacitance probes

“…The CV values did not correlate with the rainfall amount and varied considerably for events with similar rainfall amounts. Spatial variation in overland flow and infiltration has been commonly attributed to soil surface conditions and topography, vegetation, and soil properties (Rawls et al 1983, 1989, Brakensiek and Rawls 1988. The elevation was not found to affect either I -ET or Sw variation in our study.…”