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DESCRIPTION:Groundwater-surface water exchange is often a controlling facto
 r in water resource management\, ecosystem health and material cycling in 
 river networks. However it is often overlooked when assessing water alloca
 tions\, aquatic ecosystem services and stream vulnerability. This is often
  due to departmental separation between hydrology and hydrogeology\, the i
 nvisible often diffusive flux of groundwater to surface waters\, and the a
 vailability of robust methods to quantify water exchange at the catchment 
 scale. It is also due to the difficulty in obtaining representative values
  in heterogeneous groundwater systems for standard parameters such as the 
 hydraulic conductivity\, or chloride concentrations. This is especially du
 e for chloride in Europe\, where groundwater chloride concentrations are e
 xtremely variable compared to arid and semi-arid countries such as Austral
 ia. In this presentation I will focus on the use of radon-222 (222Rn) as a
  quantitative tracer for groundwater discharge to streams and lakes from t
 he headwaters to the dynamic coastal regime. 222Rn is produced in the grou
 ndwater system through decay of 238U series isotope 226Ra. The ubiquitous 
 presence of 238U in the mineral matrix of aquifer and stream sediments res
 ults in a consistently and significantly higher 222Rn concentration in gro
 undwater than surface water. This emanation from the aquifer matrix can be
  used for two different purposes in groundwater-surface water studies: 1) 
 to quantify groundwater discharge to rivers on km scales using mass-balanc
 e\, and 2) calculate residence times of young surface water in river and b
 ank sediments (e.g. hyporheic zone) on times scales of up to 20 days. In p
 articular the large contrasting activities between surface water and groun
 dwater means that 222Rn can be used in many different environments to trac
 e water flows at the groundwater surface water interface. New developments
  in 222Rn methodologies mean that it can be measured in point samples in t
 he field or on-line using continuous measurement devices to trace the dyna
 mic of groundwater-surface water exchange in a diverse array of environmen
 ts. By combining water fluxes from the 222Rn analysis and chemical measure
 ments it is also possible to estimate turnover of contaminants such as nit
 rate in the hyporheic zone. This will be the primary focus of this present
 ation.\n*** -&nbsp\; midterm habilitation lecture -
DTSTART;TZID=Europe/Berlin:20181108T120000
DTEND;TZID=Europe/Berlin:20181108T133000
SUMMARY:Dr. Ben Gilfedder\, Limnological Research Station\, BayCEER\, UBT (
 Homepage): Groundwater - Surface Water Exchange: From Mountains to the Sea
TRANSP:TRANSPARENT
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