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- W2156029887 abstract "Soil surface roughness is a parameter that may influence considerably the hydraulic properties at the soil surface. Evaluation of maximum water depression storage (MDS), i.e. the absolute volume of water that potentially can be stored at a rough surface before water runoff starts, will be useful to increase knowledge and to improve modelling of erosive processes. This work aims at comparing different MDS estimation methods, using both empirical and geometrical models in soil surfaces covered with different crop residue amounts. Point elevations were measured by means of a pin meter and a laser relief meter; using 30 mm x 30 mm and 2 mm x 2 mm grids, respectively. Surface water depression storage was found to depend mainly on the type of boundary conditions assigned to the test surfaces and on the grid parameters. Because of the small size of the experimental plots, it was concluded that models taken into account plot boundary effects result in more realistic estimations. When resolution of the experimental plot is modified by increasing grid size, only minor differences in roughness roughness, RR, and maximum depressional storage, MDS, assessed by taking into account boundary effects values are not, were observed. However, when modelling is performed under free drainage conditions at the boundary of the small experimental plots, MDS values were found to decrease with decreasing grid resolution. In both studied cases, i.e. with and without boundary effect, accuracy of RR and MDS values increases as the grid resolution increases. Soil surface topography is characterized by high spatial dependence, associated with the size of soil structural units, aggregates and clods and maximum depressional storage is controlled by the upper and lower cutoff length scales of the sampled plot, i. e., grid resolution and plot size." @default.
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- W2156029887 date "2005-12-21" @default.
- W2156029887 modified "2023-09-22" @default.
- W2156029887 title "Evaluación del almacenamiento temporal de agua en depresiones del microrrelieve" @default.
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