Abstract

ALBORNOZ-EUAN, Beth Sua Iztaccihuatl  and  GONZALEZ-HERRERA, Roger Amílcar. Aquifer pollution vulnerability in Yucatan under climate change scenarios. Ecosistemas y recur. agropecuarios [online]. 2017, vol.4, n.11, pp.275-286. ISSN 2007-901X.  https://doi.org/10.19136/era.a4n11.1037.

The Yucatán aquifer is highly vulnerable to pollution, due to the characteristics of the geological material, soil and recharge conditions, the last of which can be modified by changes in the climate. The aim of this work was to evaluate the aquifer's vulnerability to pollution under the variations of temperature and precipitation caused by climate change. Regional climate change scenarios for Mexico were used in the near (2015-2039) and future (2075-2099) horizons to calculate the evapotranspiration and recharge to model vulnerability with the DRSTIL index. The parameters of the DRSTIL index are water depth (D), recharge (R), soil (S), topography (T), impact to vadose zone (I) and land use (L). Each of the parameters has a weighting of 1 to 5 according to its importance. The parameters are divided into classifications according to the impact of pollution and have a score of 1 to 10. The weighted sum of the factors establishes the values for the intervals of classification of the degrees of vulnerability. The results show that under the effects of climate change, compared to the current map showing the distribution of vulnerable areas, there is an increase in the area with moderate vulnerability and a decrease in the areas with high vulnerability for all climate change scenarios, due to the change in land use and the reduction in recharge.

Keywords : Groundwater; DRSTIL; regional scenarios; modeling; recharge.

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