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ERODIBLE SOIL: good results on soil with prohibitive conditions.

 

 

<p>Erodible soil Umbria site</p>

Erodible soil Umbria site

<p>Renaturation</p>

Renaturation erodible soil

ERODIBLE SOIL: SITE IN BASILICATA REGION

ERODIBLE SOIL. An extraordinary result on soil with very high salt content and exposed to weather conditions prohibitive for temperature, wind and water shortages.

 

ERODIBLE SOIL. Dynamics of the erosive phenomena origin from various concomitant causes. On the Italian territory, mainly due to the climate characterizing our latitudes, the main erosive agent is represented by rain water that erodes the soil through various actions (hydraulic erosion) like:

–   kinetic energy of water drops (drop erosion);

–   soil particles superficial transport (interill erosion);

–   formation of rivulets (rill erosion);

–   formation of tracks and deep gullies (gully erosion).

ERODIBLE SOIL. The intensity of the erosive action then depends on several factors, like:

–   intensity and duration of rain water;

–   length and inclination of the slope;

–   vegetation;

–   intrinsic soil erodibility, mostly correlated to the granulometric characteristics of the soil itself.

ERODIBLE SOIL. The role of the vegetation in the protection of the slopes from the erosion has been long studied and documented by experimental investigations. The protection from erosion depends on the type of vegetation, arboreal and/or herbaceous, and in general terms it consists in:

–   absorption of a part of the kinetic energy of the water drops;

–   slowing down of the streaming phenomena;

–   delay in the attainment of the conditions of complete soil saturation;

–   soil reinforcement thanks to the root system;

–   limitation, filtering and contrast of particles dragging phenomena.

ERODIBLE SOIL. Several approaches for quantitative evaluation of erosion (soil loss) have been proposed, like those based on theoretical models, physical models at reduced scale and empiric models. Among the last ones is evidenced the Universal Soil Loss Equation  – USLE (Wischmeier and Smith, 1965; 1978), empirical equation adopted by United States Department of Agriculture for assessment of hydraulic erosion.

ERODIBLE SOIL. Such equation generally is diffused in the following form:

A = R × K × LS × P × C                       [1]

 

where:

A:    specific soil loss [t/ha year], associated to phenomena of rill and interill erosion;

R:    Rainfall-Runoff Erosivity Factor: climatic factor relevant to the intensity and duration of precipitations [MJ mm/ha h year];

K:    Soil Erodibility Factor: pedologic factor that expresses the erodibility of the ground [t h/MJ mm];

LS:  geometrical factor function of the steepness and length of the slope;

P:    Supporting Practices Factor: reduction factor taking into account possible interventions of protection, control and conservation;

C:    Cover-Management Factor: reduction factor depending on the vegetation.

 

ERODIBLE SOIL. Erosion phenomena and surface instability events of slopes may be effectively contrasted by vegetal blankets with deep root systems. Such technology, simply consisting on seeding perennial grasses, appears effective, quick to realize and does not require any maintenance.

ERODIBLE SOIL. It is recognized that an efficient protection (deep roots and strong aboveground vegetation) may affect mechanical and hydraulic conditions of the slope, which in turn would influence the equilibrium conditions of potentially sliding surface portions of soil.

ERODIBLE SOIL. The effects of root installation are first recognizable as mechanical reinforcement due to the same roots; moreover, the grass system affects, even meaningfully, the hydrologic balance of the involved area, thanks to the ability of the aerial plant system to shield part of rainfalls and to transfer to the atmosphere by transpiration the water absorbed from the ground.

 

ERODIBLE SOIL.

  1. Soil erodibility

    www.fao.org/docrep/t1765e/t1765e0f.htm

    Traduci questa pagina

    Soil erodibility. The erodibility of a soil [Plate 2] as a material with a greater or lesser degree of coherence is defined by its resistance to two energy sources: the 

  2. RUSLE – an online soil erosion assessment tool

    www.iwr.msu.edu/rusle/kfactor.htm

    Traduci questa pagina

    K Factor. K factor is soil erodibility factor which represents both susceptibility of soil to erosion and the rate of runoff, as measured under the standard unit plot .

    1. Universal Soil Loss Equation – Wikipedia, the free encyclopedia

      en.wikipedia.org/…/Universal_Soil_Loss_Equation

      Traduci questa pagina

      The Universal Soil Loss Equation (USLE) is a widely used mathematical model that describes soil erosion processes. Erosion models play critical roles in soil 

 

— Claudio Zarotti

2 Responses to “ERODIBLE SOIL: good results on soil with prohibitive conditions.”

  • ERODIBLE SOIL: extraordinary result on soil with very high salt content and exposed to weather conditions prohibitive for temperature, wind, rain.

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