کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6413308 1629937 2014 15 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Hydrological investigation of a multi-stratified pit lake using radioactive and stable isotopes combined with hydrometric monitoring
ترجمه فارسی عنوان
بررسی هیدرولوژیکی دریاچه گودال چند طبقه بندی شده با استفاده از ایزوتوپ های رادیواکتیو و پایدار همراه با نظارت بر هیدرومتر
کلمات کلیدی
دریاچه گودال، آب معدنی اسید، طبقه بندی، پویایی آبهای زیرزمینی، سیلاب تاریخ ایزوتوپهای پایدار،
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
چکیده انگلیسی


- Pit lakes connected with mine tunnels and shafts may display unique stratification features.
- A multi-isotopic study has been conducted in a meromictic pit lake with complex stratification.
- Tritium abundance has provided a plausible lake flooding model.
- δ18O and δ2H isotopes combined with hydrological studies have solved the pit lake dynamics.
- The physical structure of the lake is very stable and not affected by groundwater flow.

SummaryThe internal configuration and hydrological dynamics of meromictic pit lakes is often complex and needs to be studied by different tools including stable and radiogenic isotopes. This study combines a multi-isotopic approach (3Hw, δ2Hw, δ18Ow, δ34SSO4) with meteorological, hydrological and hydrochemical monitoring to deduce the flooding history and hydrological dynamics of a meromictic and deeply stratified pit lake (Cueva de la Mora mine, SW Spain). The mine system is complex and includes horizontal galleries, shafts and large rooms physically connected to the mine pit. Specific conductance and temperature profiles obtained in the pit lake draw a physical structure with four monimolimnetic sub-layers of increasing density with depth. This characteristic stratification with m-scale layers separated by sharp transitional zones is rather unusual in other pit lakes and in most natural lakes. Tritium abundance in the different layers indicates that the deep lake water entered the pit basin between 1971 and 1972 which is coincident with the dates of mine closure. The oxygen and deuterium isotope composition of the different layers describes a marked and stable stratification, with an increasing evaporative influence towards the lake surface and a minimal influence of groundwater flow on the structure and composition of the monimolimnion. This study reveals that the initial stages of flooding (via influx of metal- and sulfate-loaded mine drainage from underlying galleries at different depths) may be essential to imprint a layered physical structure to pit lakes which would be very difficult to explain merely by physical processes. After reaching its present water level and morphology, the monimolimnion of this pit lake seems to have remained essentially isolated and chemically unmodified during decades.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hydrology - Volume 511, 16 April 2014, Pages 494-508
نویسندگان
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