Modeling of Subsurface Runoff and Surface Runoff During Storm Precipitation in Low-Slope Undeformed and Surface-Deformed Soils on Agricultural Lands

Abstract

The mathematical problem addressed in this study concerns the formation of subsurface and surface runoff during storm precipitation in a low-slope area featuring both undeformed and surface-deformed soils. Approximate relationships governing the water accumulation on the surface of these soils and the movement of the saturation front were derived. Additionally, the timeframe for infiltration and groundwater closure, as well as the dissipation of the surface layer following the cessation of precipitation, was determined. Utilizing generalized initial data for fine soils along with a two-layer soil configuration at the experimental site, the accuracy of the derived relationships was evaluated. This study delves into the process of soil wetting during the formation of a low-permeability interlayer on the surface, resulting from compaction and swelling. A detailed analysis was provided for the comparison of subsurface runoff under conditions of varying degrees of deformation, both with and without surface deformation.