HW-2: Danube bank infiltration

• download the Excel file DanubeGw3H3He.xls which contains the relevant measured data and constants
• a map of the area of investigation:

1) (10p) He, Ne data

• plot Ne versus ⁴He concentration for the groundwater data and for water in solubility equilibrium with the atmosphere
• determine slope of the additional component, what conclusion can you draw from this regarding the He and Ne components present?
• what is your best rough estimate of the temperature at which the water equilibrated with the atmosphere?

2) (10p) Groundwater ³H/³He data

• write out the balance equation for ³He, ⁴He, and Ne
• calculate the tritiogenic ³He (³He_trit)
• convert ³He_trit from ccSTP/g into TU
• calculate the ³H/³He age
• plot ³H and ³H+³He_trit versus distance from the Danube; where do the peaks occur?
• plot ³H/³He age versus distance from the Danube (mark shallow and deep wells by different symbols)
• determine horizontal flow velocity

3) (10 p) Compare groundwater data with ³H in precipitation and Danube River

• plot  ³H in precipitation and Danube River water as a timeseries
• can you explain the differences between the two time series?
• plot ³H+³He_trit as a function of ³H/³He age, and ³H in precipitation and Danube River water in one timeseries plot (groundwater sampling date: 5/1993)
• what does this plot tell you?