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SIIA Público
SISTEMA INTEGRAL DE INFORMACIÓN ACADÉMICA - PÚBLICO
Título del libro: 5th International Workshop On The Analysis Of Multi-Temporal Remote Sensing Images 2009, Multitemp 2009 Título del capítulo: Effect of deforestation on runoff of a small watershed nearby Mexico City, during 1977 to 2001
Computer software; Deforestation; Image analysis; Land use; Remote sensing; Runoff; Time series analysis; Cartographic models; Good correlations; Ground truth data; Hydrologic conditions; Hydrologic process; Land cover land use; Precipitation map; Watershed characterization; Watersheds
Resumen:
Time series analysis of an area of 1,739 km for the 1973-2002 period using Landsat images (MSS and ETM), existing maps, orthophotos, and ground truth data (Garcia, et al., 2005) helped to select a representative small watershed to study the effect of deforestation on runoff. Cartographic modeling helped to simulate runoff of a small watershed (ca. 3,000 Ha) within Mexico City. Manipulation of land cover-land use, geomorphology, relief and soil maps allowed for watershed characterization. The infiltration map was obtained by crossing land cover-land use with the soil hydrologic condition type map. Watershed runoff estimation was performed with infilu-ation map and with precipitation map and both in IDRISI, Andes software. Results were similar in all scenarios (about 0.7 m's ). Comparison of this result with available data of annual average, compiled over a 25-year span by CNA (Comisi6n Nacional del Agua) indicates a very good correlation (0.63 m's ) validating the watershed runoff modeling procedure performed in here. This analysis may be performed in other smaller or medium size watersheds leading to the better understanding of the hydrologic processes of the region and therefore to the more appropriate use and administration of this vital resource.