On topographic controls of soil hydraulic parameter scaling at hillslope scales

摘要: [1] Most upscaling efforts for soil hydraulic parameters developed thus far have opted to ignore the effect of topography in their derivation effective parameter values. This approach, which considers a flat terrain with no lateral flows, is reasonable as long coarser support dimensions are order few hundred meters. In such scenario, upscaled characteristics governed predominantly by texture and structure domain. However, when fine-scale data much larger extents (hillslope scales beyond), plays bigger role can longer be ignored. Efforts model hydrologic processes phenomena, particular emphasis on those occurring unsaturated zone, conducted at various scales. We present here study isolate influence topographic variations effective, under different hillslope configurations. The power-averaging operator algorithm was used aggregate resolutions. Hydrologic scenarios were simulated using HYDRUS-3D four configurations conditions test validity parameters. outputs from simulations (fluxes moisture states) compared across multiple validating effectiveness It found that produced reasonably good estimates coarse Further, probable threshold dimension beyond dominates property variation analyzed. On basis only topography, scaling able capture required generate equivalent flows states coarsened