Research in the HOAL / Chemistry
30 August 2017

Splash erosion investigations

Nives Balenovic, doctoral student from Croatia working in a cooperation project from IKT...

17 August 2017

New paper published by R. Silasari

Rasmiaditya Silasari recently published her paper in the journal 'Hydrological Processes'. The...

02 August 2017

Infiltrometer measurements over whole catchment

Giorgio Nicchi and Tommaso Picciafuoco, guests students from University of Perugia, Italy are...

30 June 2017

Temporal soil net removal

Currently the temporal soil net, which is measuring soil moisture and soil temperature down to...

12 May 2017

Maintenance campaign

Last week several doctoral students of the doctoral programme were busy in the HOAL in...

Science Questions – How much Phosphorus and Nitrogen is Moved Through the Landscape into the Streams?

There is a delicate balance between the application of phosphorus and nitrogen as a fertiliser to agricultural land and their harmful effects on surface and subsurface waters. Cost-effective mitigation measures need to target the sources and flow paths that conduct the bulk of the load.

Multiple flow paths (e.g. overland flow, macropore flow, matrix flow, tile drainage) of these substances are studied in the HOAL. A water quality monitoring network was installed. While the high sediment concentrations in the HOAL facilitate the sediment process analyses, they complicate the monitoring of water quality parameters, as they tend to clog sensors.  A new device was developed, termed Water Monitoring Enclosure, that allows in-situ monitoring of water quality parameters for highly dynamic, sediment laden streams. This paper describes the design of the Water Monitoring Enclosure.

Autosampling and grab sampling is performed at regular intervals, and analysed for a range of parameters including stable isotopes. Mixing analyses, assisted by tracer tests, have identified the main sources and flow paths in the landscape.