Data on geochemical and hydraulic properties of a characteristic confined/unconfined aquifer system of the younger Pleistocene in northeast Germany

Merz, Christoph; Steidl, Jörg

doi:10.5194/essd-7-109-2015

Cited by 10 publications

(23 citation statements)

References 11 publications

(8 reference statements)

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“…Quillow catchment (168 km 2 ) study area in which 20 kettle holes (three and four digit numbers) were sampled for water and sediments. The stream water was sampled at three points along the Quillow stream (Q1, Q2, Q3), rain water collectors are depicted by triangles, the two wells from Merz and Steidl () are represented by red triangles, and the village Dedelow is indicated by a star. Different land use types are depicted across the fields in the 2015 water season…”

Section: Methodsmentioning

confidence: 99%

Ephemeral kettle hole water and sediment temporal and spatial dynamics within an agricultural catchment

et al. 2017

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Kettle holes are glacially created ponds that form within landscape depressions and are numerous across young moraine landscapes. Kettle hole water budgets are based primarily on winter precipitation, and therefore, undergo pronounced short‐term changes in water level fluctuations. Little is known about kettle hole sediment biogeochemistry in NE Germany, especially with regards to hydroperiod. Our objective for this study was to link the abiotic influences demarked by the evaporative isotopic signal from kettle hole water and solute chemistry to sediment organic matter turnover imprinted in the sediment δ13C and δ15N isotopic values. From the 20 kettle holes we sampled, 19 of these completely dried out, but on different dates. This dynamic was partially explained by longitudinal and elevational changes over the catchment area illustrating regional controls of kettle hole water balance. At the scale of an individual kettle hole, we estimated evaporation explained up to 38% of water volume loss. The changes in water levels were weakly related to differences in surface sediment elemental N and C concentrations between kettle hole edge and centre positions. These dynamics were primarily driven by redox conditions, Ca2+, and several nutrient concentrations (dissolved organic carbon, total dissolved nitrogen, total dissolved P, and ammonium) in the water column. Although we did not detect differences in the surface sediment δ13C and δ15N values, the δ15N signature in relation to the C:N ratio highlights the advanced decomposition state of surface sediment OM in temporarily water filled kettle holes.

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Section: Methodsmentioning

confidence: 99%

Ephemeral kettle hole water and sediment temporal and spatial dynamics within an agricultural catchment

et al. 2017

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“…They have been equipped with automatic ventilated pressure transducers, recording groundwater head at daily intervals. For more details, the reader is referred to Merz and Steidl (2015).…”

Section: Groundwater Datamentioning

confidence: 99%

Forensic hydrology: what function tells about structure in complex settings

et al. 2016

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Facing the challenges of the European Water Framework Directive and competing demands requires a sound knowledge of the hydrological system. This is a major challenge in regions like Northeast Germany. The landscape has been massively reshaped during repeated advances and retreats of glaciation during the Pleistocene. This resulted in a complex setting of unconsolidated sediments with high textural heterogeneity and with layered aquifer systems, partly confined, but usually of unknown number and extent of single aquifers. The Institute of Landscape Hydrology aims both at a better understanding of hydrological processes and at providing a basis for sustainable water resources management in this region. That would require sound information about the respective regions of interest that are rarely available at sufficient degree of detail. Thus, there is urgent need for alternative approaches. For example, time series of groundwater head, lake water level and stream runoff do not only depend on (unknown) geological structures, but in turn can reveal information about major geological features. To that end, different approaches have been developed and successfully applied at different scales, based both on advanced time series analysis and dimension reduction approaches and on well-known and rather simple methods. This approach has been coined ''forensic hydrology'': Like in a crime story, numerous pieces of evidence are combined in a systematic way to end up with a consistent conceptual model about the prevailing cause-effect relationships. An example is given for the Quillow catchment in Northeast Germany in a rather complex geological setting.

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“…This leads often to desiccation of the uppermost stream reaches (Lischeid et al, 2017). Thus, shallow groundwater and tile drain discharge, both sources with relatively high agricultural load, did not contribute to stream discharge during these periods and larger areas of the catchment got hydraulically decoupled from the stream network (Merz and Steidl, 2015). Similar 785 effects of the seasonal variability of the hydrological connectivity of streams, groundwater and tile drainage in agricultural catchments on the concentration level of agriculturally born solutes in the stream water have been reported, e.g.…”

Section: Long-term Patternsmentioning

confidence: 51%

“…Sci. consumption of the geogenic sulphides is irreversible and might lead to the depletion of the denitrification capacity in the deep aquifer in the long run (Merz et al, 2009;Zhang et al, 2009;Merz and Steidl, 2015). Consequently, buffering of NO 3 -surplus from agricultural land use is expected to decrease and NO 3 -concentration in the groundwater and the stream water is expected to increase.…”

Section: Long-term Patternsmentioning

confidence: 99%

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Detecting dominant changes in irregularly sampled multivariate water quality data sets

Lehr¹,

Dannowski²,

Kalettka³

et al. 2018

Preprint

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Time series of catchment water quality often exhibit substantial temporal and spatial variability which can rarely be traced back to single causal factors. Numerous anthropogenic and natural drivers influence groundwater and stream water quality, 20 especially in regions with high land use intensity. In addition, typical existing monitoring data sets, e.g. from environmental agencies, are usually characterized by relatively low sampling frequency and irregular sampling in space and / or time. This complicates the differentiation between anthropogenic influence and natural variability as well as the detection of changes in water quality which indicate changes 25 of single drivers. Detecting such changes is of fundamental interest for water management purposes as well as for scientific analyses.We suggest the new term 'dominant changes' for changes in multivariate water quality data that concern 1) more than a single variable, 2) more than one single site and 3) more than short-term fluctuations or single events and present an exploratory 30 framework for the detection of such 'dominant changes' in multivariate water quality data sets with irregular sampling in space and time. Firstly, we used a non-linear dimension reduction technique to derive multivariate water quality components. The components provide a sparse description of the dominant spatiotemporal dynamics in the multivariate water quality data set. In addition, they can be used to derive 35 hypotheses on the dominant drivers influencing water quality. Secondly, different sampling sites were compared with respect to median component values. Thirdly, time series of the components at single sites were analysed for seasonal patterns and linear and non-linear trends. Spatial and temporal heterogeneities are efficiently used as a source of information rather than being considered as noise. Besides, non-40 linearities are considered explicitly. The approach is especially recommended for the exploratory assessment of existing long term low frequency multivariate water quality monitoring data.

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Data on geochemical and hydraulic properties of a characteristic confined/unconfined aquifer system of the younger Pleistocene in northeast Germany

Cited by 10 publications

References 11 publications

Ephemeral kettle hole water and sediment temporal and spatial dynamics within an agricultural catchment

Ephemeral kettle hole water and sediment temporal and spatial dynamics within an agricultural catchment

Forensic hydrology: what function tells about structure in complex settings

Detecting dominant changes in irregularly sampled multivariate water quality data sets

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