Research in the HOAL / Erosion
21 July 2021

Heavy rainfall event

Heavy rains crossed the HOAL catchment area last week. In 24 hours, 160 mm of...

11 January 2021

Sap flow measurements on trees

For measuring transpiration on trees, so called "Sap Flow sensors" were installed. In sum six...

09 September 2020

Modification work at the catchment outlet - MW

As the catchment outlet (MW) is one of our most important measurment points, a new radar sensor is now...

28 August 2020

Maintenance works and eddy covariance calibration

In august Borbala Szeles,  Patrick Hogan and Lovrenc Pavlin were on site, supported by...

22 June 2020

Heavy rainfall event - flooding video

As predicted last weekend heavy rain fall occured in eastern Austria. Also the HOAL was affected by high...

Science Questions – What are the Space-Time Patterns of Erosion and Sediment Transport Processes?

Knowledge about the sources of sediments is very relevant for managing contaminants such as phosphorus and for controlling soil loss from agricultural landscapes. During infiltration excess overland flow events in the HOAL, sheet, rill and gully erosion may occur on the fields that are poorly covered by crops, but sedimentation immediately occurs when the sediment laden water enters a field with better cover.

Turbidity is monitored at various locations in the HOAL along with autosamplers to be able to calibrate the sediment-turbidity relationships for each event separately. Aerial photographs are taken to identify erosion patterns and calculate eroded soil volumes after erosive rainfall events.

To understand sediment deposition and resuspension in the stream, repeated resuspension experiments were conducted, where sediment-free water was pumped into the source of the stream and flow rates, sediment and solute concentrations as well as grain size distributions were measured. The experiments are complemented by numerical modelling.