News Archive

News Archive

15 April 2016

New soil moisture sensors for Sentinel calibration

For the ongoing ESA Sentinel-1A satellite calibration in the HOAL new soil moisture sensors were installed additionally between the existing soil net by Mariette Vreugdenhil. A network of in total 20 additional sensors will help evaluating the signals of Sentinel-1A.

A goal of the satellite observations is also to determine vegetation characterisitica, therefore Mariette is also going to do a regular sampling of the vegetation for detecting reference water content amounts. In addition she is measuring the development of the crops in the HOAL fields, where currently rapeseed is in its full bloom.


Sentinel new soil moisture sensor
24 March 2016

Evaluation of ESA's Sentinel-1A satellite

Mariette Vreugdenhil started to prepare an evaluation campaign of the European Space Agency's Sentinel-1A satellite, which is a polar-orbiting, all-weather, day-and-night radar imaging mission for land and ocean services.
The campaign will contain measurements of vegetation water contents, crop heights, plant phenology, leaf area index (LAI), and soil moisture.
This picture shows her defining the spots of the LAI measurements.


LAI measurement
24 February 2016

Eddy covariance station moved to new spot

Today micro meteorologist Patrick Hogan moved one of the mobile eddy covariance stations again to a new spot in the HOAL catchment. For the next months the station will measure the atmospheric conditions over a winter barley field. The results of this measurements will again help to understand the spatial evaporatoin patterns in the HOAL catchment.


Eddy covariance barley field
08 February 2016

Ground control measurements for camera calibration

Today Rasmi Silasari is in the field for making ground control measurements for calibrating her camera, which is mounted on the top of the HOAL weather station mast. The camera makes regularly pictures and movies of a certain part of a field, where regularly overland flows occur after heavy rainfalls. These observations are done to investigate the space-time patterns and connectivity of surface flow.


ground control point measuring
28 January 2016

BACTcontrol maintenance at the HOAL

Philipp Stadler is in the field today to operate the regularly maintenance works of the BACTcontrol devices, which he is using for his investigations of fecal pollution in the HOAL stream. With the support of a colleague, the devices are removed from the sample location at the catchment outlet and brought to the workshop, where the whole equipment is tested and cleaning and maintenance works are done.


bactcontrol maintenance outlet