Research in the HOAL / Chemistry
14 Februar 2020

New "Modified H-Flumes"

Around the start of this year the disicion was made to install new measuring weirs. These...

21 November 2019

Shallow core drilling to confirm the occurence of biogeochemical hotspots delineated with geophysical imaging

On 14th of November, two boreholes with depths of 8 and 6 m respectively, were drilled at...

06 June 2019

Visit of "Vienna Doctoral Programme" students

On the 5th of June, a group of students of the Vienna Doctoral Programme on Water Resource...

17 April 2019

Maintenance at the weather station

On 17th of April there was a big maintenance at the HOAL weather station with repairing...

15 April 2019

Professor Thomas Dunne visiting the HOAL

Professor Thomas Dunne is an expert of fluvial geomorphology and hydrology, working at the...

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.