Environtmental and Global Health

Archive for the ‘Erosion’ Category

It is defined as the act of gnawing, spend, causes a loss of substance of the relief and produces a vacuum, a volume decrease. In this work of sculpture is given a hidden name that is sometimes known, the gliptogenesis.

Erosion occurs when water, ice or wind drag the ground or weathered rock. The soft rock is more likely to be fragmented and pulled hard rock.

When erosion occurs suddenly, can be very dangerous. Avalanches and landslides and mud are examples of mass movements: that is, sudden movements, downhill, a large amount of soil, rock and water.

Ablation and displacement of the worn material is transported, which is the second phase of the process of erosion. The gravity along a slope, wind, etc say this shift.

And after a wear or material loss and subsequent transport of the same lead to an accumulation which is the last phase of this process called erosion. Read the rest of this entry »

Desertification is land degradation in arid, semiarid and dry sub-humid areas. Mainly caused by climatic variations and human activities such as farming and overgrazing, deforestation and lack of irrigation. Desertification does not refer to the expansion of existing deserts. It happens because dryland ecosystems, which cover a third of the total land, is extremely vulnerable to over-exploitation and inappropriate land use.

According to the United Nations Programme for Environment (UNEP), desertification threatens a quarter of the planet, directly affects over 250 million people and threatens the livelihoods of over 1 000 million more than 100 countries to reduce the productivity of toerras for agriculture and livestock. These people include many of the poorest, most marginalized and politically weak citizens. Although desertification can be caused by drought, in general the main cause is human activity: the exceivos cultivation and grazing, deforestation and lack of irrigation. Read the rest of this entry »

D. EVALUATION OF EROSION

Looking to the intervention of the territory under remedial management of erosion, are indispensable tools whose use to obtain a primary characterization of such processes, for it is possible to use rating scales that although the same preparation the differentially subjectivity permeates the other hand are very useful due to its ease of use and usefulness to the scale of work in such stages of the intervention, allowing even the development of thematic mapping.

SOIL EROSION PER SHARE ANTHROPIC:

Mainly due to the hand of man and his activities.

Since no direct natural forces (except gravity), but human intervention through its practices and technologies. The magnitude of the erosion process as the latter only recently begun to be recognized. Read the rest of this entry »

Its negative effects range from reducing the productive capacity of the land affected, to cause catastrophic damage, both economic and sometimes becoming life.

1. Parts of a mass movement. The morphology of a mass movement can gain valuable information on both the type of movement as its genesis. Hanves (1984) cited by Tragsa-Tragsatec (1998) proposes to his characterization from the elements that compose them whose numerical correspondence is contained in Table 8. The presence or absence of such elements and their dimensions and spatial relationships, to define its type, in Appendix 3 has a guide to the identification of active or recently active movements, based on the characteristics of some of the items concerned. Read the rest of this entry »

b) Slope of terrain.

Normally, one would expect that the erosion would increase as they did the degree and slope length, as a result of corresponding increases in speed and volume of surface runoff. Also, while on a flat surface the patter of raindrops throws soil particles randomly in all directions, in steep slope conditions more soil is splashed it down than up increasing the proportion as does the degree (Morgan, 1986).

In theory, law of falling bodies, the water velocity varies with the square root of the vertical distance it travels, and its erosive capacity with the square of the velocity, that is, if the slope is increased four times , the velocity of water flowing over it is duplicated, and quadrupling its erosive capacity.

B. WIND EROSION

Occurs when the wind carries tiny particles that hit a rock and fall into more particles that are colliding with other things. It is usually found in deserts and mountains dune forms rectangular or even in relatively dry areas. This entails a longer time because of the time it takes to erode. Read the rest of this entry »

CONCEPT OF EROSION

Erosion can be defined broadly as a process of entrainment of soil by water or wind, or as a process of accelerated evolution and drag soil particles caused by water and wind (Smith, 1980 .) This implies the existence of two elements involved in the process: a person who is the ground, and an asset that is water, wind, or participation alternative, the vegetation in turn acts as a regulator of relations between elements.

Moreover, from the perspective of geology and landscape formation, erosion is seen as part of the process through which morphogenesis is altered and shape of landforms.

From this point of view, the configuration now has the earth’s surface, is due to the ongoing processes of aggradation and degradation in geologic time, have shaped the surface. These geomorphic processes are related to internal factors (lithology, structure, tectonics, volcanism and topography) and external (climate: temperature and precipitation, agencies, and human action). Read the rest of this entry »

What is Erosion?

The process is called erosion of theft or wear floor intact rock, by action of exogenous geological processes such as surface water flows or glacial ice, wind, or temperature changes. The eroded material can be:

By the very action of wind, water, glaciers and thermal expansion-contraction seasonal or diurnal variations.

Erosion usually is seen as a further process of degradation of soils. However, more rigorous, should differentiate between the mechanisms of damage or deterioration and loss of the resource. Among the latter could include erosion and sealing, while among the first the rest of the general mind in the literature (contamination, compaction, salinisation, etc..). Read the rest of this entry »

Erosion usually is seen as a further process of degradation of soils. However, more rigorous, should differentiate between the mechanisms of damage or deterioration and loss of the resource. Among the latter could include erosion and sealing, while among the first the rest of the general mind in the literature (contamination, compaction, salinisation, etc..).

Because the soil is a renewable natural resource on a human scale, its loss by erosion or sealing can be considered irreversible. Consequently, the environmental problem generated must be addressed through preventive measures. By contrast, the degradation is also generally recognized rehabilitation techniques. In this contribution break down the types of processes we call erosion. Read the rest of this entry »