کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4580091 1630147 2007 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Recharge to groundwater in the Turi Basin, northern Chile: An evaluation based on tritium and chloride mass balance techniques
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
Recharge to groundwater in the Turi Basin, northern Chile: An evaluation based on tritium and chloride mass balance techniques
چکیده انگلیسی

SummaryThe Turi Basin contains an unconfined phreatic aquifer within the Toconce Formation volcano-sedimentary sequence that passes eastwards under the Quaternary volcanic chain and outcrops in the Altiplano. The phreatic aquifer is floored by impermeable welded Miocene ignimbrites. Precipitation captured by the volcanic edifices infiltrates through high permeability soils to recharge the phreatic aquifer. The hydrochemistry of the groundwater in the phreatic aquifer shows little evidence of mixing with geothermal water and therefore approximates to a closed system. Tritium values demonstrate that recharge is occurring under current climatic conditions and takes around 40 years to pass 10+ km from recharge areas on the slopes of the volcanoes and the Altiplano to the center of the basin. The chloride mass balance technique has been used to quantify precipitation recharge at 15,500 m3 d−1. This is significantly less than the flow through the phreatic aquifer (58,000–86,000 m3 d−1) calculated from its physical properties and the difference is interpreted to be due to subsurface inflow through the Toconce Formation from the Altiplano. The results of this study have wider application throughout the Andean hydrological environment of northern Chile.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hydrology - Volume 334, Issues 3–4, 28 February 2007, Pages 534–544
نویسندگان
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