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The Hainich Critical Zone Exploratory and Facilities


Location of the Hainich CZE, Landscape


The Hainich CZE is located in the northwestern part of the Federal State of Thuringia, central Germany.  The well and monitoring plot transect (Figure 2) follows the eastern slope of the Hainich low-mountain range. Dominant land-use types of the cultural landscape are ancient woodland (Hainich National Park) in Hainich ridge areas, as well as managed forest. The eastern slopes are agriculturally impacted and used for cropland and pasture land (Figure 2). Small villages in the surrounding of the transect are Kammerforst, Flarchheim, Langula, and Oberdorla.


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Autumnal Beech Forest, Hainich National Park
  kammerf_t
View over Kammerforst and the geomorphological, tectonic syncline "Mühlhausen-Langensalzaer Mulde"
  feld_t
Agricultural soil management





Geology


The Hainich carbonate-rock landscape, as a part of the Thuringian Basin, is situated at its western margin. The major geological units that build the eastern Hainich hillslope belong lithostratigraphically mainly to the Middle and Upper Muschelkalk subgroups (marlstones, limestones; Germanic Triassic) and to the Lower Keuper (clay-/siltstones) in the western part (Figure 2). Holocene alluvial deposits are found along little creeks and rivers. Locally, pleistocene loess deposits are found. The area is tectonically stressed with fault systems/decompaction zones striking in a north-west-south-eastern direction.


cross-section
Fig. 2: Geological cross section through the Hainich CZE (Source: Totsche, Lehmann in Küsel et al. 2016, CC-BY 4.0, unmodified)





Hydrology and Hydrogeology


Hydrologically, the area is characterized by its water divide - the Hainich ridge. This important groundwater recharge area discharges to the river Werra (tributary to the Weser catchment) in the west and to Unstrut (tributary to the Elbe catchment) in the east. The carbonate-rock formations of the Upper and especially of the Middle Muschelkalk are prone to karstification. Sinkholes are a frequent indicator of the subsurface dissolution and erosion (subrosion). Some of these collapse-sink elements facilitated the rise of pressurized groundwaters of the confined aquifers and formed famous springs. The major and investigated aquifers of the area are developed in the bedrock as fissure to and karstic-fissured aquifers.





The Soils


Soil types found are rendzinas, brown rendzinas, and cambisols with the lime- and marlstones as parent material; fluvisols and gleysols along the rivers; and luvisols, with cambic and stagnic properties as well as stagnosols in the loess-covered planes.





The Monitoring Well Transect


The Hainich CZE has been instrumented with a transect of groundwater monitoring wells along the main flow direction (south-west north-east, Figure 2). At five locations (H1 through H5) along the transect, up to four groundwater wells have been build at each. The wells access the main aquifer of the Upper Muschelkalk and addional aquifers in the multi-storey carbonate-rock setting.


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Monitoring well construction
  H5moni
Waterlevel monitoring
  ipht_gwm_t
Online gasphase analysis





Test/Monitoring Sites


Several test sites on locations of different land-use types were equipped with lysimeters, moisture & temperature sensor networks, rainwater collectors, ...

Recent and ongoing fieldwork comprise monitoring/sampling  of the different equipped compartments and field experiments.

  i308
Fencing the pasture-monitoring plot in autumn 2014
verm5
Tree inventory (B02)
 
verm1
 Surveying campaign on a sensor network plot (B02)
  lysimeterinst_k
Lysimeter installation (C03)
gf07Soil survey (D03)
  k_rainsmp_fl2
Precipitation monitoring (B02)
  k_soilsmp-bd1_bd3
Soil sampling (A01 &A03)
i309
Geological Survey (D03/C03)

 
i307
Groundwater monitoring (D03)
  lyssampling_k
Soil leachate sampling (C03)
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Sample processing in the Kammerforst fieldbase (A02)

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Soil gas sampler construction (B03)
  creekmonit_k
Surface water sampling (D03)
lowflow-sampling_k
Aquatic particle sampling (C03)
  soilsurvey_k
Soil survey, soil description (D03)
  ramcore_k
Bedrock sounding, ramcore drilling (D03/C03)