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Universiteit Gent (2005)

EVALUATION OF WATER EROSION RISKS IN DRYLANDS OF CHILE

BAERT Arne

CAZALAC, Centro del Agua para Zonas Áridas y Semiáridas de América Latina y el Caribe.

Titre : EVALUATION OF WATER EROSION RISKS IN DRYLANDS OF CHILE

EVALUATIE VAN WATER EROSIERISICO’S IN DROGE GEBIEDEN IN CHILI

Auteur : BAERT Arne

Université de soutenance : Universiteit Gent

Grade : BIO-INGENIEUR IN HET LAND- EN BOSBEHEER 2005

Présentation
The aim of this study is to investigate in situ one aspect of this land-degradation, i.e. water erosion, both a cause and a consequence of desertification and the main limitation for agriculture on steeper slopes in Latin America, although at present, the problems of accelerated water erosion have extended to other areas with more gentle slopes (2-8%) (Pla, 1992a, 1993a, 2003). Pla (2003) points out that in general the combat against soil erosion in Latin America frequently has not been very effective due to lack of sufficient basic information or research on site to support the application of particular soil conservation practices. Although there are clear evidences that large and increasing areas of lands are being affected by different processes of soil erosion, most of the existing evaluations of the type, extension and intensity of soil erosion in Latin America are not very precise and objective ( Pla, 2003). The research involves a collection and evaluation of data in order to identify and evaluate the erosion processes in the drylands of Chile and to reveal possible correlations between the involved parameters and soil loss. This should lead to a satisfying equation describing the sediment transport process. Such a function together with rainfall data and a digital elevation model of the area can serve in a ’sediment transport model’ to predict the amount of sediment loss due to one rain event in that area. In this way it should be possible to create a diversity of maps allowing us to visualize the risks on erosion and to comprehend the extent of the problem in this region. This information then may contribute in a better understanding of the processes involved and within the framework of an adequate soil conservation and land use policy can be very useful in designing erosion control structures and water harvesting techniques, two very important factors in soil conservation and rehabilitation and in the pursuit of reforesting the hills with vegetation best adapted to the environment.

Version intégrale (CAZALAC)

Page publiée le 26 décembre 2015, mise à jour le 12 décembre 2017