Research in the HOAL / Chemistry
17 January 2018

Mobile eddy maintenance

Today Borbala Szeles, student from the DK on water resource systems, is in the HOAL fields to...

17 November 2017

Deep borehole groundwater sampling

Today again Lovrenc Pavlin and Markus Oismüller were operating the groundwater sampling at the...

03 November 2017

Preparing temporal soil net for next season

The temporal soil net is currently prepared and checked for the next installation in the HOAL...

13 October 2017

European network of hydrological observatories (ENOHA)

Recently the homepage of the European network of hydrological observatories - short 'ENOHA'...

22 September 2017

Deep borehole groundwater sampling

Recently Lovrenc Pavlin, new doctoral student from Slovenia in our DK programme, was operating...

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.