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  • HOBE - Center for Hydrology - Hydrological Observatory
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    Original URL path: http://www.hobe.dk/index.php/component/mailto/?tmpl=component&template=cleanlogic&link=eff1a6ae53f61034a2527c8542f0cb4dd4a8a82e (2016-05-02)
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  • WP3 - Soil Moisture & Recharge
    is acquired from 30 distributed permanent stations with Decagon 5TE sensors installed at three depths in the top 0 5 m of the soil Task 2 Geophysical arrays Geophysical arrays are installed for cross borehole monitoring of the spatio temporal variations of water content and a saline tracer The setup consists of five ERT and four GPR boreholes drilled to the water table Eight boreholes form a cross consisting of two lines with the last ERT borehole in the centre Along each line the outer two boreholes are equipped with ERT instrumented PVC tubes while the inner two boreholes have access tubes for GPR antennae An array of piezometers will be installed for automatic recordings of water table fluctuations Task 3 Soil physical parameters Soil cores samples were used for laboratory analysis of soil hydraulic characteristics Soil texture water retention and saturated soil hydraulic conductivity were measured The laboratory analysis was further expanded to include near saturated hydraulic conductivity on 20 by 20 cm soil cores Large scale effective hydraulic properties will be estimated using both inverse approaches based on the collected data on water content and tracer concentrations and various upscaling techniques including the stochastic approaches Task 4 Airborne remote sensing of soil moisture During a selected time window airborne brightness temperature measurements of the EMIRAD 2 microwave L band radiometer Technical University of Denmark and concurrent ground observations of soil moisture and auxiliary parameters are acquired in the Skjern River Catchment Denmark Using the ground data as input to a radiative transfer model L band brightness temperatures are modeled The data is aggregated for comparison at both the airborne spatial scale few kilometers and the SMOS footprint scale 44 km Task 5 Satellite borne remote sensing of soil moisture Brightness temperature and soil moisture products of the Soil

    Original URL path: http://www.hobe.dk/index.php/workpackages/wp3-soil-moisture-recharge?tmpl=component&print=1&page= (2016-05-02)
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  • HOBE - Center for Hydrology - Hydrological Observatory
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    Original URL path: http://www.hobe.dk/index.php/component/mailto/?tmpl=component&template=cleanlogic&link=fd06bddb9b472f5394d42f1053c7396d935c1bf4 (2016-05-02)
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  • WP4 - Aquifer Interactions
    level changes in 23 piezometers Forty temperature probes have recorded seasonal changes in temperature in the stream bed and used to quantify the seepage to the stream Stream discharge CFC apparent ages and water temperature at two levels have been measured at the stream stations 2010 2012 A fiber optic cable DTS has been installed at site II partly shaded for longer periods up to several months to record spatio temporal changes in temperature at the stream bed Two DTS columns have been installed to record the temperature at the atmosphere stream aquifer interfaces Furthermore a climate station was installed The long term placement of the DTS cable allows us to investigate the importance of sedimentation scouring 2012 2013 Site II has now been abandoned and moved to site III with less shading Two different streams within the Skjern catchment have been monitored with pressure transducers and acoustic Doppler instruments during the period 2010 2012 Acoustic Doppler Velocity Meters AVMs have been installed in two three different levels where they record the average flow velocity Monthly discharge measurements using an Acoustic Doppler Current Profiler ADCP have also been performed at the two sites Influences from seasonal and short duration changes in weed distribution and abrupt changes in stage have been recognized in the velocity gradients in the streams It has been shown that the joint use of use of stage data and multi level acoustic Doppler velocity data can provide estimates of the hydrographs estimation with lower uncertainty than traditional stage discharge methods An experimental program with sampling of tracer hydrographs and discharge hydrographs are currently carried out in one of the small headwater streams in the Skjern River catchment Four locations along a 3 km stretch of the stream have been instrumented with water samplers which collect time series

    Original URL path: http://www.hobe.dk/index.php/workpackages/wp4-aquifer-interactions?tmpl=component&print=1&page= (2016-05-02)
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  • HOBE - Center for Hydrology - Hydrological Observatory
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    Original URL path: http://www.hobe.dk/index.php/component/mailto/?tmpl=component&template=cleanlogic&link=de0a69c95835e8669d7ca53bb676daf7facbd2ef (2016-05-02)
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  • WP5 - Groundwater Dynamics
    the information and data obtained from hydrological and geophysical investigations into a numerical groundwater model Work content Task 1 SkyTEM survey A SkyTEM survey has been conducted in the western side of the catchment over Ringkøbing lagoon revealing extremely detailed information on the hydrogeological setting by application of novel methodology developed at Aarhus University The survey provides a highly detailed picture of the salinity distribution in the area showing that the hydrological setting is to a large degree governed by a heterogenous geology The results of the survey is currently used as the basis for further hydrological studies of the area as well as refining existing hydrological models Task 2 Mapping of saltwater freshwater dynamics in Ringkøbing Fjord Measurements on the shallow groundwater system below the Ringkøbing Fjord have been carried out using several tracers and methods 1 water seepage meter 2 temperature 3 Salinity and 4 stable isotopes The campaigns have been carried out in spring summer fall and winter Furthermore the location of the saltwater freshwater interface has been locally mapped using EM31 in collaboration with Andrew Binley Task 3 Numerical modelling A 2D density dependent flow and transport model has been used to investigate i the effect

    Original URL path: http://www.hobe.dk/index.php/workpackages/wp5-groundwater-dynamics?tmpl=component&print=1&page= (2016-05-02)
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  • HOBE - Center for Hydrology - Hydrological Observatory
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    Original URL path: http://www.hobe.dk/index.php/component/mailto/?tmpl=component&template=cleanlogic&link=c13ddabb049b13eeb5ccfb2979bb160fddccb37c (2016-05-02)
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  • WP6 - Greenhouse Gasses
    measuring N2O and CO The eddy covariance technique is applied to calculate the fluxes of all greenhouse gases The high frequency raw data is processed using the Alteddy software Wageningen University and Research Centre The Netherlands Task 2 Partitioning of the CO2 fluxes At the forest site the vertical within canopy CO2 profile is monitored and 4 soil respiration chambers have been installed for continuous measurements of the CO2 flux between the soil and the canopy air Leaf level photosynthesis chambers will be applied on occasion at all three sites Meteorological sensors measuring the microclimate in and above the vegetation accompany the investigations Task 3 Feedbacks between carbon and water cycle The exchange rates of H2O and CO2 between the vegetation and the atmosphere are closely linked through the action of the stomata in the leaves Therefore the study aims to develop a robust description of the stomatal resistance of the three vegetation types and its response to environmental factors The water use efficiency being the ratio between the CO2 uptake and the water loss is monitored continuously at the canopy scale and the CH4 fluxes at the meadow site will be compared to the depth of the water table

    Original URL path: http://www.hobe.dk/index.php/workpackages/wp6-greenhouse-gasses?tmpl=component&print=1&page= (2016-05-02)
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