Currently an infiltrometer measurement campaign is operated by Tommaso Picciafuoco (guest student from University of Perugia, Italy) at the HOAL catchment. With several Double Ring infiltrometer sets and one Csiro infiltrometer device he is determining the saturaded hydraulic conductivity on a grass land field. Later, some other representative spots in the catchment will be investigated.
Some days ago atmospheric scientist Patrick Hogan was in the field, supported by Matthias Oismüller, to maintain some of the weather station devices. The present weather station (which is measuring raindrop distribution) and the mobile eddy covariance systems (evaporation) were checked and prepared for calibration. Since warmer temperatures are on the way to come evaporation and other parameters are again important to be monitored.
Recently at the eight new ground water monitoring gauges, which were installed in Sepember 2016, diver sensors have been installed to permanently monitor the ground water level at these gauges.
The eight gauges are located at different representing spots in the catchment and were drilled from 15 meters up to 42 meters depth. There is soon also a regularly water sampling for water quality analysis planned and the monitoring should lead to a better understanding of the groundwater behaviour in the catchment.
Currently the HOAL is still covered by a snow layer of 10cm or partly even more. In the next days warmer temperatures are predicted so we expect the melt of the snow and a rise of the discharge at the stream or even slight overland flow on the fields.
Therefore Matthias Oismüller and Markus Oismüller were in the field today to get all H-flumes, where the different discharges at the tributaries and stream are measured, ready for this observations. Since there were deep temperatures in the last weeks the stations partly got frozen and got ready now for the next events.
Today Markus Oismüller was collecting the precipitation deposit samples from the HOAL weather station. The first try yesterday to 'just' drive down with the 4WD car to the spot of the weather station failed due to too high snow on the road. Luckily a neighbouring farmer could help to get out the car of the snow again.
Finally the samples were collected by foot. See on the pictures the beautiful snow cover over the HOAL Petzenkirchen with e.g. some soil moisture stations heading out through the snow.