Aquifer Recharge Estimation through Atmospheric Chloride Mass Balance at Las Cañadas Caldera, Tenerife, Canary Islands, Spain

Water

Rayco Marrero-Diaz²  Francisco J. Alcalá¹  Nemesio M. Pérez²  Dina L. López³  Gladys V. Melián²  Eleazar Padrón²  Germán D. Padilla² 

[1] Civil Engineering Research and Innovation for Sustainability (CERis), Instituto Superior Tecnico, Universtiy of Lisbon, Lisbon 1049-001, Portugal; E-Mail:;Environmental Research Division, Institute of Technology and Renewable Energies (ITER), Granadilla de Abona, Tenerife, Canary Islands 38611, Spain; E-Mails:;Instituto Volcanológico de Canarias (INVOLCAN), Puerto de la Cruz, Tenerife, Canary Islands 38400, Spain; E-Mail:

关键词: aquifer recharge;    chloride mass balance;    Cl/Br ratio;    Las Cañadas;    Tenerife;   

DOI  :  10.3390/w7052451

来源: mdpi

【 摘 要 】

The atmospheric chloride mass balance (CMB) method was used to estimate net aquifer recharge in Las Cañadas Caldera, an endorheic summit aquifer area about 2000 m a.s.l. with negligible surface runoff, which hosts the largest freshwater reserve in Tenerife Island, Canary Islands, Spain. The wet hydrological year 2005–2006 was selected to compare yearly atmospheric chloride bulk deposition and average chloride content in recharge water just above the water table, both deduced from periodical sampling. The potential contribution of chloride to groundwater from endogenous HCl gas may invalidate the CMB method. The chloride-to-bromide molar ratio was an efficient tracer used to select recharge water samples having atmospheric origin of chloride. Yearly net aquifer recharge was 631 mm year⁻¹, i.e., 69% of yearly precipitation. This result is in agreement with potential aquifer recharge estimated through an independent lumped-parameter rainfall-runoff model operated by the Insular Water Council of Tenerife. This paper illustrates basic procedures and routines to use the CMB method for aquifer recharge in active volcanic oceanic islands having sparse-data coverage and groundwater receiving contribution of endogenous halides.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.