scholarly journals Methodology, results, and significance of an unsaturated-zone tracer test at an artificial-recharge facility, Tucson, Arizona

1989 ◽  
Keyword(s):  
Unsaturated Zone ◽  
Artificial Recharge ◽  
Tracer Test

scholarly journals Tracer test modeling for local scale residence time distribution characterization in an artificial recharge site

2016 ◽  
Author(s):  
Cristina Valhondo ◽  
Lurdes Martínez-Landa ◽  
Jesús Carrera ◽  
Juan J. Hidalgo ◽  
Isabel Tubau ◽  
...  
Keyword(s):  
Water Quality ◽  
Artificial Recharge ◽  
Groundwater Resources ◽  
Homogeneous Model ◽  
Tracer Test ◽  
Flow Conditions ◽  
Transport Parameters ◽  
Complex Flow ◽  
Concentration Data ◽  
Heterogeneous Model

Abstract. Artificial recharge of aquifers is a technique for improving water quality and increasing groundwater resources. Understanding the fate of a potential contaminant requires knowledge of the residence times distribution (RTD) of the water beneath the artificial recharge infrastructure. A simple way to obtain the RTDs is to perform a tracer test. We performed a pulse injection tracer test in an artificial recharge system through an infiltration basin to obtain the breakthrough curves, which yield directly the RTDs. These were very broad and we used a numerical model to interpret them, and to extend the characterization to other flow conditions. The model comprised nine layers at the site scaled to emulate the layering of aquifer deposits. Two types of hypotheses were considered: homogeneous (all flow and transport parameters identical for every layer) and heterogeneous (diverse parameters for each layer). The parameters were calibrated against the head and concentration data in both model types, which were validated quite satisfactory against 1,1,2-Trichloroethane and electrical conductivity data collected over a long period of time with highly varying flow conditions. We found that the broad RTDs were caused by both the complex flow structure generated under the basin (the homogeneous model produced broad RTDs) and the heterogeneity of the media (the heterogeneous model yielded much better fits). We conclude that acknowledging heterogeneity is required to properly assess mixing and broad RTDs, which are required to explain the water quality improvement of artificial recharge basins.

Modeling a Thick Unsaturated Zone at San Gorgonio Pass, California: Lessons Learned after Five Years of Artificial Recharge

2012 ◽  
Vol 11 (4) ◽  
pp. vzj2012.0043 ◽  
Author(s):  
Alan L. Flint ◽  
Kevin M. Ellett ◽  
Allen H. Christensen ◽  
Peter Martin
Keyword(s):  
Unsaturated Zone ◽  
Artificial Recharge ◽  
Lessons Learned

scholarly journals Tracer test modeling for characterizing heterogeneity and local-scale residence time distribution in an artificial recharge site

2016 ◽  
Vol 20 (10) ◽  
pp. 4209-4221 ◽  
Author(s):  
Cristina Valhondo ◽  
Lurdes Martínez-Landa ◽  
Jesús Carrera ◽  
Juan J. Hidalgo ◽  
Isabel Tubau ◽  
...  
Keyword(s):  
Water Quality ◽  
Residence Time ◽  
Time Distribution ◽  
Residence Time Distribution ◽  
Artificial Recharge ◽  
Homogeneous Model ◽  
Tracer Test ◽  
Flow Conditions ◽  
Concentration Data ◽  
Heterogeneous Model

Abstract. Artificial recharge of aquifers is a technique for improving water quality and increasing groundwater resources. Understanding the fate of a potential contaminant requires knowledge of the residence time distribution (RTD) of the recharged water in the aquifer beneath. A simple way to obtain the RTDs is to perform a tracer test. We performed a pulse injection tracer test in an artificial recharge system through an infiltration basin to obtain the breakthrough curves, which directly yield the RTDs. The RTDs turned out to be very broad and we used a numerical model to interpret them, to characterize heterogeneity, and to extend the model to other flow conditions. The model comprised nine layers at the site scaled to emulate the layering of aquifer deposits. Two types of hypotheses were considered: homogeneous (all flow and transport parameters identical for every layer) and heterogeneous (diverse parameters for each layer). The parameters were calibrated against the head and concentration data in both model types, which were validated quite satisfactorily against 1,1,2-Trichloroethane and electrical conductivity data collected over a long period of time with highly varying flow conditions. We found that the broad RTDs can be attributed to the complex flow structure generated under the basin due to three-dimensionality and time fluctuations (the homogeneous model produced broad RTDs) and the heterogeneity of the media (the heterogeneous model yielded much better fits). We conclude that heterogeneity must be acknowledged to properly assess mixing and broad RTDs, which are required to explain the water quality improvement of artificial recharge basins.

Artificial Recharge Through a Thick, Heterogeneous Unsaturated Zone

Ground Water ◽  
2008 ◽  
Vol 46 (3) ◽  
pp. 475-488 ◽  
Author(s):  
John A. Izbicki ◽  
Alan L. Flint ◽  
Christina L. Stamos
Keyword(s):  
Unsaturated Zone ◽  
Artificial Recharge

scholarly journals Time-lapse gravity data for monitoring and modeling artificial recharge through a thick unsaturated zone

2016 ◽  
Vol 52 (9) ◽  
pp. 7244-7261 ◽  
Author(s):  
Jeffrey Kennedy ◽  
Ty P. A. Ferré ◽  
Benjamin Creutzfeldt
Keyword(s):  
Unsaturated Zone ◽  
Artificial Recharge ◽  
Gravity Data ◽  
Time Lapse
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