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Universiteit Gent (2006)

ASSESSMENT OF CLIMATE INDICES IN DRYLANDS OF COLOMBIA

NEIRA MENDEZ Fredy Hernando

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

Titre : ASSESSMENT OF CLIMATE INDICES IN DRYLANDS OF COLOMBIA

Auteur : NEIRA MENDEZ Fredy Hernando

Université de soutenance : Universiteit Gent

Grade : BIO-INGENIEUR IN HET LAND- EN BOSBEHEER 2006

Résumé
Climate indices are used to determine drylands in seven different geographical zones of Colombia. These zones are selected from previous studies as the areas with land degradation and desertification problems. With secondary information of 391 stations the following indices are evaluated : Lang (1915), Thornthwaite (1948), De Martonne (1926), Emberger (1930), UNEP (1997) and Bagnouls-Gaussen (1957). From those, only the Lang, UNEP and Thornthwaite indices show drylands in Colombia although all of them result in different classification for each region. Aggressivity of rainfall is evaluated using the Modified Fournier Index (MFI) (Arnoldus, 1980). The Caribbean, Magdalena, Santanderes and Nariño are the zones with higher aggressivity of rainfall. The Guajira zone however has index values between low and very low aggressivity. Seasonality of rainfall is evaluated using the Precipitation Concentration Index (PCI) (Oliver, 1980). For almost all the zones, the areas with high seasonality are those classified as dry lands, and the areas with low seasonality are the more humid ones. The Erosivity index (ErIn) is estimated using the CORINE (1995) methodology. The Caribbean zone shows a high erosivity index. Santanderes, Nariño and Magdalena zones have moderate to high values. The Guajira and Cauca zones have dominant moderate values and the Cundiboyacense between low to moderate erosivity.

Version intégrale (CAZALAC)

Page publiée le 10 décembre 2015, mise à jour le 25 janvier 2018