®®®® SIIA Público

Título del libro: Lake Alchichica Limnology: The Uniqueness Of A Tropical Maar Lake
Título del capítulo: Hydrogeology and Hydrochemistry of the Serdán-Oriental Basin and the Lake Alchichica

Autores UNAM:
GLORIA VILACLARA FATJO; MARIA AURORA ARMIENTA HERNANDEZ; OSCAR ARNOLDO ESCOLERO FUENTES;
Autores externos:

Idioma:

Año de publicación:
2022
Palabras clave:

Endorheic basin; Groundwater; Hydrogeochemistry; Maar lake; Mexico; Water-level decline


Resumen:

Serdán-Oriental is an endorheic basin with scarce surface runoff. Groundwater plays an essential role in the water balance and the chemistry of the existing water bodies, including Lake Alchichica. The principal aquifer is mainly composed of pyroclastic materials with high hydraulic conductivity. Groundwater flows from the recharge zones in the basin?s borders at higher altitudes and converges to the central plateau at the lowest altitude. The aquifer has a sodic-bicarbonate composition and an average, depth-dependent, low ionic concentration. There are local discharges both in the maar craters and the two playa lakes. There are at least two fresh (TDS < 3 g/L) and slightly alkaline groundwater inflow zones in Lake Alchichica. This contribution assembled historical data (1941, 1988-89, 2001, 2007, 2011, and 2019) of the major ionic composition, electrical conductivity (at 25 °C), total alkalinity, and pH of Lake Alchichica water. There is a slight increase in ionic concentration, salinity, and alkalinity. This observation and the variations in some ionic ratios suggest that Alchichica waters? chemical signature is changing, likely synchronically with the lake?s level decline reported in recent decades. If this salinity increasing trend continues, it may threaten the unique -microendemic- aquatic biota. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2022.


Entidades citadas de la UNAM: