Flowcap: continuous ‘passive’ registration of
loads from drainage tubes
HRWQ-monitoring workshop Magdeburg
Joachim Rozemeijer, Jasperien de Weert, Janneke Klein, Stefan Jansen
Introduction
2006-2010: DYNAQUAL
Papers with focus on water and solute transport modeling:
Van der Velde et al, 2010a-c, 2011a,b (Vadose Zone J., HESS, WRR)
Papers with focus on water quality monitoring:
Rozemeijer et al., 2007, 2009, 2010a-d (Env Poll., J. Hydrol., WRR, ES&T)
Email:
[email protected]
[email protected]
Introduction
Fundamental and
Applied Limnology
Volume 184/3 Special Issue:
Frontiers in
real-time
ecohydrology
Editor: Jörg Lewandowski
Introduction
Variations in flow route contributions are the main
driver for dynamics in surface water quality
Groundwater:
Long travel times
Tube drains:
Medium travel times
Overland flow:
Short travel times
Rozemeijer et al, 2011, Environmental Pollution
22 Maart 2010
6
Results: field to catchment
Flowcap development
Goal DiVeLOp-project:
To design a cheap, robust, and broadly applicable measurement system
for loads from subsurface tile drains and drainage from glasshouses
First design
Load measurements
system
Phase 1
Prototype
Phase 2
Lab tests
Phase 4
Communication
Phase 3
Field tests
Application
At RIVM, water
authorities, and
glasshouses
Flowcap development
Flowcap development
Drainwat
er
Flowcap development
Flowcap development
Flowcap development
Conclusion from DYNAQUAL regarding SorbiCells:
• Good results for NO3 after start up problems and adjustments
• Average concentration measurements preferable over snapshots
for better load and average concentration estimates
But:
• SorbiCells give time averaged concentrations and not flow
averaged concentrations
Flowcap development
Day 1-10: 1 liter containing 1 g (1 g/l)
Day 11: 10 liter containing 100 g (10 g/l)
Time average concentration: 1.82 mg/l
Flow average concentration: 9.2 mg/l
11 litre -
1 litre -
Flowcap development
Flowcap development
Flowcap development
Zeewolde-RIVM
Flowcap development
Bleiswijk-Glasshouse
NO3-N (mg/l)
Dscharge
Flowcap development
Discharge largely during the night
NO3 lower during discharge ‘events’
Flowcap development
Flowcap development
Conclusions
• Flowcap produced good results in laboratory conditions
• Flowcap and SorbiCells need some ‘babysitting’ during first field
applications
• Flowcap design is being improved based on field experience
• Flowcap may also be applicable for load measurements of other
solutes and other types of drainage tubes (industrial/medical spills?)
[email protected]