The Geothermal Field Below the City of Berlin, Germany: Results from Structurally and Parametrically Improved 3D Models

Frick, Maximilian; Sippel, Judith; Cacace, Mauro; Scheck‐Wenderoth, Magdalena

doi:10.1016/j.egypro.2016.10.011

Cited by 7 publications

(29 citation statements)

References 14 publications

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“…In order to parametrize this layer, we relied on a previous sensitivity analysis (Haacke, 2018) where the range of variations of the permeability have been constrained by laboratory test data (Schälchli, 1993) and field measurements (Ingerle, 1991;Beyer and Banscher, 1975). The best fitting value here corresponds to the characteristics of the Oligocene Rupelian (Frick et al, 2016, Table 1).…”

Section: Hydrogeological Modelmentioning

confidence: 99%

“…The 3-D structural model used here, is based on the study of Frick et al (2016). It differentiates 20 geological units, 8 Cenozoic, 8 Mesozoic and 2 Paleozoic, for the sedimentary succession and 2 units for the underlying basement.…”

Section: Hydrogeological Settingmentioning

confidence: 99%

“…However, the Middle Muschelkalk consists of evaporites, thereby representing an aquitard. The overlying Cenozoic sediments are predominantly composed by unconsolidated clastics (Frick et al, 2016) which contain the main shallow aquifer system utilized for the water supply of Berlin (Limberg and Thierbach, 2002). This upper aquifer system has a total thickness of 150 m and can be subdivided into four different aquifers, with the second aquifer regarded as the most important (Limberg and Thierbach, 1997).…”

Section: Hydrogeological Settingmentioning

confidence: 99%

“…In comparison to earlier models (Frick et al, 2017), we include a colmation layer as a 1 m thick layer at the base of the surface water bodies, thinning out towards the shoreline. As based on previous analysis (Beyer and Banscher, 1975;Karpf, 2012), this layer is assumed to be mostly impermeable, being composed of organic matter and fine grained sediments of the riverbed.…”

Section: Hydrogeological Modelmentioning

confidence: 99%

“…In detail, in Model 1 (M1 hereafter) we apply a fixed in time hydraulic head distribution (first order boundary condition) over the whole spatial extent of the model domain. The hydraulic head distribution has been derived from previous studies (Frick et al, 2017) and takes into account, though implicitly, the secondary effects related to pumping activities on the surface to subsurface hydraulics. In a second model realization (M2 hereafter) the effects of pumping activities on the groundwater dynamics have been implemented in a more realistic manner by explicitly integrating production wells with variable rates as active boundary conditions in the model.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

3-D Simulations of Groundwater Utilization in an Urban Catchment of Berlin, Germany

Haacke¹,

Frick²,

Scheck‐Wenderoth

et al. 2018

Adv. Geosci.

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Abstract. The objective of this study is to analyze the influence of groundwater pumping on predicted groundwater circulation below the urban center of Berlin, Germany, by 3-D numerical models. Of particular interest are hydraulic head distributions, the related shallow-deep groundwater interactions and their scale dependency within an anthropogenically overprinted environment. For this purpose, two model scenarios are investigated. In the first model realization (Model 1), the effects of groundwater pumping are implemented by imposing a fixed, though spatially variable, hydraulic head distribution over the whole model area, therefore implicitly taking into account the effects of pumping activities. In the second model realization (Model 2), these effects are considered in an explicit manner by imposing variable production rates in locations where pumping activities are ongoing. The results of this study show, that both models predict similar hydraulic head distributions on the regional scale (i.e. urban wide). Locally, differences in the extent, volume and depth of emerging depression cones can be observed. This is manifested in differences in predicted fluid flow patterns supporting or refuting the possibility of contaminant transport in an area of importance for groundwater production (Lower Havel). Herein, the second model approach outlines the necessity of implementing wells as an active parameter to reproduce observed fluid pathways.

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Section: Hydrogeological Modelmentioning

confidence: 99%

Section: Hydrogeological Settingmentioning

confidence: 99%

Section: Hydrogeological Settingmentioning

confidence: 99%

Section: Hydrogeological Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

3-D Simulations of Groundwater Utilization in an Urban Catchment of Berlin, Germany

Haacke¹,

Frick²,

Scheck‐Wenderoth

et al. 2018

Adv. Geosci.

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Overcoming Spatial Scales in Geothermal Modelling for Urban Areas

et al. 2017

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Urban subsurface exploration improved by denoising of virtual shot gathers from distributed acoustic sensing ambient noise

Ehsaninezhad,

Wollin,

Rodríguez Tribaldos

et al. 2024

Geophysical Journal International

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Summary Ambient noise tomography on the basis of Distributed Acoustic Sensing (DAS) deployed on existing telecommunication networks provides an opportunity to image the urban subsurface at regional scales and high-resolution. This capability has important implications in the assessment of the urban subsurface’s potential for sustainable and safe utilization, such as geothermal development. However, extracting coherent seismic signals from the DAS ambient wavefield in urban environments at low cost remains a challenge. One obstacle is the presence of complex sources of noise in urban environments, which may not be homogeneously distributed. Consequently, long recordings are required for the calculation of high-quality virtual shot gathers, which necessitates significant time and computational cost. In this paper, we present the analysis of 15 days of DAS data recorded on a pre-existing fiber optic cable (dark fibers), running along an 11 km long major road in urban Berlin (Germany), hosting heavy traffic including vehicles and trains. To retrieve virtual shot gathers, we apply interferometric analysis based on the cross-correlation approach where we exclude low-quality virtual shot gathers to increase the signal-to-noise ratio of the stacked gathers. Moreover, we modify the conventional ambient noise interferometry workflow by incorporating a coherence-based enhancement approach designed for wavefield data recorded with large-N arrays. We then conduct Multichannel Analysis of Surface Waves (MASW) to retrieve 1D velocity models for two exemplary fiber subsegments, and compare the results of the conventional and modified workflows. The resulting 1D velocity models correspond well with available lithology information. The modified workflow yields improved dispersion spectra, particularly in the low-frequency band (< 1 Hz) of the signal. This leads to an increased investigation depth along with lower uncertainties in the inversion result. Additionally, these improved results were achieved using significantly less data than required using conventional approaches, thus opening the opportunity for shortening required acquisition times and accordingly lowering costs.

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The Geothermal Field Below the City of Berlin, Germany: Results from Structurally and Parametrically Improved 3D Models

Cited by 7 publications

References 14 publications

3-D Simulations of Groundwater Utilization in an Urban Catchment of Berlin, Germany

3-D Simulations of Groundwater Utilization in an Urban Catchment of Berlin, Germany

Overcoming Spatial Scales in Geothermal Modelling for Urban Areas

Urban subsurface exploration improved by denoising of virtual shot gathers from distributed acoustic sensing ambient noise

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