Groundwater salinity and hydrochemical processes in the volcano-sedimentary aquifer of La Aldea, Gran Canaria, Canary Islands, Spain.

摘要: Abstract The origin of the groundwater salinity and hydrochemical conditions a 44 km 2 volcano-sedimentary aquifer in semi-arid to arid La Aldea Valley (western Gran Canaria, Spain) has been studied, using major physical chemical components. Current recharge is mainly result irrigation return flows secondarily that rainfall infiltration. Graphical, multivariate statistical modeling tools have applied order improve hydrogeological conceptual model identify natural anthropogenic factors controlling salinity. Groundwater ranges from Na–Cl–HCO 3 type for moderate water Na–Mg–Cl–SO 4 high water. This atmospheric airborne salt deposition; silicate weathering, incorporating flows. High evapotranspiration produces significant evapo-concentration leading relative area. Under average conditions, about 70% used intensive agricultural exploitation valley comes three low runoff storage reservoirs upstream, out area, while remaining 30% derives groundwater. main alluvial behaves as short turnover time reservoir adds surface waters complement supply dry periods, when it reaches requirements. seasonality intra-annual variability demand press on decision making use by large number users acting their own.