Case Studies

 

The following case studies using chemical and isotopic tracers address various hydrological research questions. Browse through the case studies by geographic regions or specific tracers.

Many of the case studies below investigate groundwater recharge. Some question the sources, pathways, and rates of recharge, while others ask if this water source is renewable. Others attempt to document changes in recharge after significant abstraction, artificial recharge, or dam leakage has occurred.

Tracer studies using water vapor can differentiate monsoonal versus non-monsoonal air masses, or identify air masses traveling across the Sahara. Tracer studies using snowmelt can identify recharge points at different elevations.

Some of the studies define basic aquifer characteristics such as groundwater age, residence time, and redox conditions. Others are concerned with aquifer or surface water contamination due to agricultural products, arsenic, or salinization. Studies of coastal aquifers are concerned with the current or near threat of saltwater intrusion.

While some of the case studies look to the future in hope of securing water for development, other studies seek to describe the past—including historical river discharges (as with the Nile) and the meteoric composition and circulation of past climates.

 

Case Studies by Region

 

Asia

 

 

Australia

 

 

Middle East

 

 

North Africa

 

 

North America

 

 

South America

 

 

West Africa

 

 

Case Studies by Tracer

 

18O and 2H

 

      Bhishm Kumar

      U. K. Sinha and S. V. Navada                                                                                                         

      G M Zuppi

      G M Zuppi

      Navid Dejwakh

      Jeffrey Gawad

      Scott Simpson

      Carlos D. Soto-López

       Melissa Schlegel

      Jessica Driscoll

      Phoolendra Kumar Mishra

      J. Keith Rodgers

      Patrick Broxton

      Joseph R. Gustafson

 

3H

 

      Bhishm Kumar

      U. K. Sinha and S.V. Navada

      G M Zuppi

      Navid Dejwakh

      Scott Simpson

      Carlos D. Soto-López

      Melissa Schlegel

 

3He

 

      Stephen Osborn

      Brittney Bates

 

13C

 

      G M Zuppi

      Stephen Osborn

      Navid Dejwakh

      Jeffrey Gawad

      Carlos D. Soto-López

      J. Keith Rodgers

 

14C

 

      G M Zuppi

      Navid Dejwakh

      Jeffrey Gawad

      Scott Simpson

      Carlos D. Soto-López

      Melissa Schlegel

 

230Th/ 234U

 

      J. Keith Rodgers

 

234U/ 238U

 

      Carlos D. Soto-López

 

35S

 

       Jessica Driscoll

 

34S

 

 

87Sr/ 86Sr

 

      G M Zuppi

      Stephen Osborn

      Jeffrey Gawad

      Carlos D. Soto-López

      Melissa Schlegel

      Jessica Driscoll

 

143Nd

 

      Jeffrey Gawad

 

CFCs and SF6

 

 

15N

 

      Navid Dejwakh

 

Noble Gases (Ne, Ar, Kr, Xe), N2

 

       Stephen Osborn

       Navid Dejwakh

       Brittney Bates

 

Solutes/Anions/Cations

 

 

Major/Trace Elements

 

       G M Zuppi