Abstract

CHAVEZ-CORTES, Marta Magdalena; BINNQUIST-CERVANTES, Gilberto  and  SALAS-FLORES, Andrea Cecilia. Multicriteria assessment of biophysical flood vulnerability in the Atoyac-Oaxaca de Juárez subwatershed. Ecosistemas y recur. agropecuarios [online]. 2017, vol.4, n.10, pp.97-109. ISSN 2007-901X.  https://doi.org/10.19136/era.a4n10.816.

The objective of this work was to evaluate and zonify flood susceptibility in the Atoyac-Oaxaca de Juárez River watershed, using an index of biophysical vulnerability (BFVI) built from criteria weighted with the Analytic Hierarchy Process (AHP) and implemented on a Geographic Information System (GIS) platform. Results show that the highest vulnerability category occupies 38.89 % of the watershed’s area. Most vulnerable are the valleys of Etla, Tlacolula, Zimatlán, Ocotlán, Ejutla, Miahuatlán and urban neighborhoods adjacent to the city of Oaxaca, a condition determined by physiographic factors, proximity to water bodies, land cover, soil type and geology. The most vulnerable municipalities are Santa Cruz Papalutla, Santa Ynés Yatzeche, San Raymundo Jalpan, Asunción Ocotlán, San Antonio Castillo Velasco, Ciénega de Zimatlán and San Jacinto Amilpas. The zonification of biophysical vulnerability to floods is an effective approximation to land use planning, urban growth programs, risk atlases and the definition of environmental management policy.

Keywords : Floods; Analytic Hierarchy Process (AHP); GIS; vulnerability; zonification.

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