Groundwater age dating

Instead, it is stored in the soil zone and eventually returned to the atmosphere by evaporation and plant transpiration.

The percentage of precipitation that becomes diffuse recharge is highly variable, being influenced by factors such as weather patterns, properties of surface soils, vegetation, local topography, depth to the water table, and the time and space scales over which calculations are made.

Coupled with the changes in the hydrological cycle and probable inducement of climate change basic elements, the Ground water recharge includes recharge as a natural part of the hydrologic cycle and human-induced recharge, either directly through spreading basins or injection wells, or as a consequence of human activities such as irrigation and waste disposal.

In arid regions, recharge occurs through the ephemeral streams, which flow through the wadi course but most of the water is absorbed in the unsaturated zone before reaching the aquifer.Unsaturated zone has a unique capability in helping to assess impacts of climate change on groundwater resources.The potential impacts of climate change can be assessed by focusing on porous, fractured, and karstic (carbonate rock, dolomite, limestone) aquifer systems.Indirect effects of climate change on groundwater quantity can result from climate-induced changes of groundwater withdrawals or land use.The former may increase due to the following reasons:.With a sea level rise of only 0.1 m, the thickness of the freshwater lens decreased from 25 to 10 m for the first island and from 36 to 28 ).For many semiarid areas, a decrease in precipitation is projected and enhanced ET in the warmer world might cause a salinization of groundwater.Recharge to the water table can occur in response to individual precipitation events in regions having shallow water tables.In contrast, unsaturated zone water in some desert regions is estimated to have infiltrated the soil surface as long as tens of thousands of years ago.We have two facilities located in the College of Mines and Earth Science at the University of Utah in Salt Lake City, Utah: the Noble Gas Lab and the Environmental Tracers Lab.The Noble Gas lab contains two mass spectrometer system capable of precise isotopic measurements of the noble gases as well as most other common atmospheric gases.

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