title: Groundwater vulnerability assessment for organic compounds: fuzzy multi-criteria approach for Mexico city.
abstract: This study was based on a groundwater vulnerability assessment approach implemented for the Mexico City Metropolitan Area (MCMA). The approach is based on a fuzzy multi-criteria procedure integrated in a geographic information system. The approach combined the potential contaminant sources with the permeability of geological materials. Initially, contaminant sources were ranked by experts through the Analytic Hierarchy Process. An aggregated contaminant sources map layer was obtained through the simple additive weighting method, using a scalar multiplication of criteria weights and binary maps showing the location of each source. A permeability map layer was obtained through the reclassification of a geology map using the respective hydraulic conductivity values, followed by a linear normalization of these values against a compatible scale. A fuzzy logic procedure was then applied to transform and combine the two map layers, resulting in a groundwater vulnerability map layer of five classes: very low, low, moderate, high, and very high. Results provided a more coherent assessment of the policy-making priorities considered when discussing the vulnerability of groundwater to organic compounds. The very high and high vulnerability areas covered a relatively small area (71 km(2) or 1.5% of the total study area), allowing the identification of the more critical locations. The advantage of a fuzzy logic procedure is that it enables the best possible use to be made of the information available regarding groundwater vulnerability in the MCMA.
authors.affiliation: Departamento de Ecología de la Biodiversidad Instituto de Ecología, Universidad Nacional Autónoma de México Tercer Circuito Exterior Ciudad Universitaria, Coyoacán 04510, México, D.F., México. mazari@servidor.unam.mx
authors.forename: Marisa
authors.initials: M
authors.lastname: Mazari-Hiriart
authors.forename: Gustavo
authors.initials: G
authors.lastname: Cruz-Bello
authors.forename: Luis A
authors.initials: LA
authors.lastname: Bojórquez-Tapia
authors.forename: Lourdes
authors.initials: L
authors.lastname: Juárez-Marusich
authors.forename: Georgina
authors.initials: G
authors.lastname: Alcantar-López
authors.forename: Luis E
authors.initials: LE
authors.lastname: Marín
authors.forename: Ernesto
authors.initials: E
authors.lastname: Soto-Galera
mesh_terms: D002947:Cities; D017143:Fuzzy Logic; D040362:Geographic Information Systems; D055593:Geological Phenomena; D005844:Geology; D008800:Mexico; D009930:Organic Chemicals; D010539:Permeability; D018570:Risk Assessment; D012987:Soil; D014507:Urbanization; D014872:Water Movements; D014876:Water Pollution
chemical_list: D009930:Organic Chemicals; D012987:Soil