Artikel Z - Driver of hydrogeo systems - How measure GW recharge?
4 important questions on Artikel Z - Driver of hydrogeo systems - How measure GW recharge?
Vadose zone recharge (infiltration)
How does the lysimeter work?
Direct measurement
Point measurement: how to extrapolate?
Expensive, labour intensive
How does the Chloride Mass Balance work and for which zone is it used?
- Vadose zone
- Chloride mass balance (CMB), works best in dry areas
- P with Chloride dripples into vadose zone
- Assumes: equal partitioning of PCp = DCuz is equal across vadose zone
- The higher C deeper down in vadose zone, the lower the recharge
- 300 mm/yr: bc it is easier to measure high concentrations of C lower in the soil
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Water Table Fluctuation (WTF)
- Recharge should lead to an increase in water storage and thus water level (that is definition of recharge)
- Phreatic aquifer: added water is accomodated via rise in water table
- Take Specific yield into account (= smt with pore space?)
- Equation: R = Sy dh/dt
- Other things might cause WTF: air movement in vadose zone, GW abstraction, ET
- Sy could be uncertain, but in coarse sediments will be close to porosity
- Only shallow water table, doesn't say much about deeper water table
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