Article,

Empirical relationships of groundwater head–salinity response to variations of sea level and vertical recharge in coastal confined karst aquifers 沿海承压岩溶含水层地下水水头—盐度对海平面和垂直补给量变化的经验关系 Relations empiriques de la réponse de la charge hydraulique et de la salinité des eaux souterraines aux variations du niveau de la mer et de la recharge verticale dans les aquifères karstiques côtiers captifs Relações empíricas da resposta da salinidade da água subterrânea a variações do nível do mar e recarga vertical em aquíferos costeiros cársticos Relaciones empíricas de la respuesta de la salinidad de las aguas subterráneas a las variaciones del nivel del mar y la recarga vertical en los acuíferos kársticos costeros confinados

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Hydrogeology Journal, 28 (5): 1679-1694 (2020)
DOI: 10.1007/s10040-020-02151-9

Abstract

Coastal aquifers are characterized by a mixing zone with freshwater–saltwater interactions, which have a strong relationship with hydrological forcings such as astronomical and storm tides, aquifer recharge and pumping effects. These forcings govern the aquifer hydraulic head, the spatial distribution of groundwater salinity and the saline interface position. This work is an empirical evaluation through time-series analysis between aquifer head and groundwater salinity associated with the sea-level dynamics and the aquifer recharge. Groundwater pressure, temperature and salinity were measured in a confined aquifer in the northwest coast of Yucatan (México) during May 2017–May 2018, along with precipitation. Cross-correlation and linear Pearson correlation (r) analyses were performed with the data time series, separating astronomical and meteorological tides and vertical recharge effects. The results show that the astronomical and meteorological tides are directly correlated with the aquifer head response (0.71 < r < 0.99). Salinity has a direct and strong relationship with the astronomical tide (0.76 < r < 0.98), while the meteorological tide does not (r < 0.5). The vertical recharge showed a moderate correlation with the aquifer head (0.5 < r < 0.7) and a nonsignificant correlation with the groundwater salinity (r < 0.5). In this study, the sea level (r > 0.7) is a more important forcing than the vertical recharge (with 0.5 < r < 0.7). Empirical relationships through time-series analysis and the separation of individual hydrological forcings in the analysis are powerful tools to study, define and validate the conceptual model of the aquifer. © 2020, The Author(s).

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