Tracing the Spatial Distribution of Whole-Lake Exchange of Groundwater and Lake Water in Low-Hydraulic Gradient Systems Using δ18O and Electrical Conductivity and Uncertain End-Member Mixing Analysis

被引：5

作者：

Engesgaard, Peter ^{[1
]}

Solvang, Ingeborg S. ^{[1
,2
]}

Steiness, Mads ^{[1
]}

Kristensen, Emil ^{[3
]}

Kragh, Theis ^{[4
]}

Duque, Carlos ^{[5
]}

机构：

[1] Univ Copenhagen, Dept Geosci & Nat Resource Management, Oster Voldgade 10, DK-1350 Copenhagen K, Denmark

[2] Multiconsult Norge AS, N-5221 Bergen, Norway

[3] Univ Copenhagen, Dept Biol, Freshwater Biol Sect, Univ Pk 4, DK-2100 Copenhagen O, Denmark

[4] Univ Southern Denmark, Biol Inst, Campusvej 55, DK-5230 Odense, Denmark

[5] Aarhus Univ, Dept Geosci, WATEC, DK-8000 Aarhus C, Denmark

来源：

WATER | 2020年 / 12卷 / 06期

关键词：

groundwater-lake exchange; tracers (delta O-18 and EC); mixing analysis with uncertain end-members; DISCHARGE; SEEPAGE; FLOW; INTERFACE; ISOTOPES; BALANCE; TRACER; HAMPEN;

D O I：

10.3390/w12061608

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

delta O-18 and electrical conductivity (EC) were used successfully to trace the spatial distribution of whole-lake groundwater-lake exchange for a small (four ha) groundwater-fed lake situated in a low relief and low hydraulic gradient area. The method relies on quick sampling of shallow groundwater, direct analysis of EC in the field, and relatively in-expensive analysis of delta O-18 in the laboratory. Ternary uncertain end-member mixing analysis (precipitation, groundwater, and lake water) quantified the composition of water discharging to and recharging from the lake. The tracer distribution and mixing analysis were in agreement with the interpreted groundwater flow near the lake. The use of only one tracer (either delta O-18 or EC) gave the same results for the recharge segments, but the discharge segments changed the origin of the water from being groundwater to precipitation controlled. The two tracers complemented each other, especially with different signals in precipitation and groundwater. The uncertain end-members were assessed based on local (groundwater and lake water) and off-site (precipitation) data. The off-site data were found to be useful if it contained representative information on local-site seasonality (uncertainty, variance). Final end-member concentrations could explain the transience of the hydrology at the site (i.e., flooding of the area adjacent to the lake during periods with high precipitation, and variability of the delta O-18 signal in precipitation). This methodology potentially represents a new option to study groundwater-lake systems. The tracer information collected over only two days is useful by itself for developing the next steps like the quantification of fluxes based on other standard methods (Darcy approach, seepage meters, or temperature). The tracer information can provide quantitative estimation of inputs and outputs by using the mixing analysis.

引用

页数：18