EROSION HIDRICA PDF

DEGRADACIÓN POR EROSIÓN HÍDRICA Erosión Hídrica ¿QUE ES? Bibliografía %C3%B3n_h%C3%. EROSION “Erosion es un proceso de movilización y transporte de partículas por agentes erosivos.” Ellison, Agentes erosivos Impacto de gotas de lluvia. La erosion hidrica de los suelos. Causas y remedios. D’Onofrio, G. Lietaert, F. Perez, C. FAO, Rome (Italy). Direccion de Fomento de Tierras y AguasMinisterio .

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EROSION HIDRICA.

Even though such a high percentage of the country’s land was found to be affected by important levels of soil erosion, quantitative estimates of the magnitudes involved are still scarce. Primer mapa nacional de la calidad del agua de Uruguay. Chilean Journal of Agricultural Research 70 1: ABSTRACT Soil erosion is a growing problem in Central Chile, particularly in coastal dry lands, where it can significantly decrease the productivity of rainfed agriculture and forestry.

From isolated to integrated long-term experiments: Ephemeral gullies reoccur in the same location, rills are parallel and generally do not reoccur in the same location. These changes result in a considerable decrease in the surface area affected by hidirca and intermediate erosion rates.

Detachment adds sediment to the sediment load. Deposition does not necessarily begin to occur just where transport capacity begins to decease. In contrast, Honorato et al. These models, however, have been used to evaluate and manage watershed erosion, most likely because of their simplicity and the availability of existing information for use in a GIS Bonilla et al.

From the cluster analysis Figure 3c and results of regression adjustment using the stepwise procedure Hidricx 3it is possible to identify two main topics for the Uruguayan environmental management: In this study, trees were assumed to be mature. The model factors were derived from field experiments; thus, our estimate may approach the real value and allow to highlight the regions and basins with high demand of an environmental management in the short term.

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A framework for the use of the universal soil loss equation in Uruguay. Results for scenario 3 hidrlca shown in Table 4. Native forest and rangelands show intermediate erosion rates.

EROSION HIDRICA. – ppt descargar

No areas are predicted to have high or intermediate erosion rates, and almost all the county lands have low erosion rates. The rainfall erosivity factor information was incorporated into erosjon GIS by creating eerosion raster file using the isoerodents of Uruguay Puentes and Szogi, and the R-factor used by Erosion 6.

The C-factors allocated for each crop management are listed in Table 1. This affords protection against erosion in less time than if native species were used to reforest these areas as in scenario 1.

Soil loss is the net mass of sediment removed from a particular portion of the slope. Information layer of crop management factor: Subsequently, a mean slope gradient was assigned to each polygon of study zone using the Polygon grid tool of free GIS software gvSIG www.

Soil conservation practices are also effective in protecting agricultural soils. Much of the county has LS values of 0.

Erosión hídrica del suelo estimada para 99 cuencas uruguayas

The L and S factors were calculated using the equations defined by Wischmeier and Smith based on the slope’s length and gradient, which were obtained from a digital elevation model DEM with a cell size of 25 x 25 m. Soil erodibility varies between 0. Exposing the soil to raindrop and surface runoff dramatically increases erosion.

Inthere was land cover that promoted a mean annual soil loss higher than tolerable values in the northern, western hidriva southern regions that was probably linked to soybean crop rotations and dairy production. Organic matter, sand and clay contents, as well as permeability and structure values for the top layer of soil were obtained from soil surveys CIREN, for each series and association of soils.

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Basic properties of the top soil layer, and soil erodibility factor K for soil series in Santo Domingo County. Their analysis demonstrated that changes in land use affected annual soil loss rates. Many models of soil erosion are available, and can be linked to spatial data management systems, such as geographic information systems GIS.

Many of the remaining areas of natural forest have been thinned for cattle and some rrosion have been cut for firewood. Information layer of soil erodibility factor information: The effects of rock fragments on the soil surface is considered in the cover-management computations.

As no information was available regarding soil conservation practices, P was assumed to be 1 throughout the county.

The results were used to generate a raster layer of slope gradients expressed in percent. These LS values are similar to those reported by Honorato et al.

La erosion hidrica de los suelos. Causas y remedios

In addition, mean annual soil erosion of each basin was obtained by weighting the erosion of each soil unit within the basin, result shown in Figure 3b. Annual rainfall is mm, concentrated in the winter months. Values in Table 4 reflect changes in vegetation:

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