Regierungsprasidium Freiburg

Freiburg, Germany

Regierungsprasidium Freiburg

Freiburg, Germany
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Gabriel G.,Leibniz Institute for Applied Geophysics | Ellwanger D.,Regierungsprasidium Freiburg | Hoselmann C.,Hessisches Landesamt fur Umwelt und Geologie | Weidenfeller M.,Landesamt fur Geologie und Bergbau Rheinland Pfalz | Wielandt-Schuster U.,Regierungsprasidium Freiburg
Quaternary International | Year: 2013

The Heidelberg Basin, in the German part of the northern Upper Rhine Graben, hosts one of the thickest successions of Plio-/Pleistocene sediments in Central Europe. From reflection seismic surveys and new research boreholes, it is known that Pleistocene sediments amount to more than 500 m thickness. The basin sediments originated both from local source areas, i.e. the highlands along the graben shoulders, and from regional source areas, i.e. the Alps. Although temporal hiatuses probably exist, the deposits are expected to be more or less complete because this part of the Upper Rhine Graben has undergone continuous subsidence in the past.Currently, the Heidelberg Basin is under investigation by a scientific drilling project. New cored boreholes have been realized at three different locations, spaced 15 km from each other. This concept provides complementing information and enables a detailed characterization of the predominantly fluvial deposits. The project aims to develop a stratigraphic reference profile of the Quaternary for this region north of the Alps, to understand how the sedimentation was controlled by tectonics and past climate change, and to derive proxy data of environmental changes.The new core material demonstrates that the Heidelberg Basin would be a possible key location for Quaternary stratigraphy in Central Europe. Information about Pleistocene periods of cold and warm climate is found within this one sediment succession in superposition; the temporal resolution of the sediment succession is high. Due to its mid-continental location it links northern and southern Europe, as well as western and eastern Europe. Based on a detailed analysis of the new drill cores a new lithostratigraphy for the northern part of the Upper Rhine Graben is developed in a first step. With the Mannheim Formation, the Ludwigshafen Formation, the Viernheim Formation, and the Iffezheim Formation, four new lithostratigraphic units of the northern Upper Rhine Graben are officially introduced. Furthermore, a new debate about identification of Basal Quaternary arises from the new research boreholes. Whereas during the last decades petrological markers were used to define Basal Quaternary, i.e. the first deposition of Alpine sediments or carbonate content, this definition fails in the depocentre of the basin. Several rock physical properties, e.g. the natural gamma radiation and the magnetic susceptibilities, reveal significant changes at the Basal Quaternary. The driving forces of these changes have to be studied in more detail in the future. © 2012 Elsevier Ltd and INQUA.

Agency: European Commission | Branch: H2020 | Program: ERA-NET-Cofund | Phase: LCE-26-2016 | Award Amount: 31.30M | Year: 2017

The GeoERA proposal is put forward by the national and regional Geological Survey Organisations (GSO) of Europe. Its overall goal is to integrate the GSOs information and knowledge on subsurface energy, water and raw material resources, to support sustainable use of the subsurface in addressing Europes grand challenges. The GeoERA consortium will organise and co-fund together with the EC a joint call for transnational research projects that address the development of 1) interoperable, pan-European data and information services on the distribution of geo-energy, groundwater and raw material resources; 2) common assessment frameworks and methodologies supporting better understanding and management of the water-energy-raw materials nexus and potential impacts and risks of subsurface use; 3) knowledge and services aimed at European, national and regional policy makers, industry and other stakeholders to support a more integrated and efficient management and more responsible and publicly accepted exploitation and use of the subsurface. The transnational projects selected in the call will be implemented by the consortium partners themselves, who provide their co-funding in-kind. GeoERA will contribute to the overall EU objective of building the ERA through enhanced cooperation and coordination of national and regional Geological Survey research programmes. GeoERA will also include forward looking activities, including the creation of opportunities for future collaborative research, and the feasibility assessment of an Article 185 initiative in Applied Geoscience as follow-up to the GeoERA ERA-NET towards the development of the ultimate goal of delivering a Geological Service for Europe.

Franz M.,Regierungsprasidium Freiburg | Knott S.D.,Hauptstrasse 14
Neues Jahrbuch fur Geologie und Palaontologie - Abhandlungen | Year: 2012

The study of foraminifera from the Bathonian and Early Callovian of Albstadt-Pfeffingen (Baden-Württemberg, southern Germany) in combination with literature data lead to the definition of five faunal assemblages for the Swabian Alb. Eight taxa can be used as key fossils for the Bathonian in Southwest Germany: Tristix oolithica, Planularia costata, Trocholina conica, Lenticulina eichenbergi, Nodosaria striatojurensis, Quinqueloculina sp. 1 BLANK, Lenticulina dictyodes, and Astacolus cf. comptula. The Callovian is marked by the first appearance of Lenticulina cf. lithuanica, Lenticulina cf. virgata, Ichthyolaria moelleri, and Marginulina semiinvoluta. Carbonate-rich layers partly yielded low diverse and low abundant microfaunal assemblages. © 2012 E. Schweizerbart'sche Verlagsbuchhandlung Stuttgart Germany.

Schadwinkel W.,Unger ingenieure Ingenieurgesellschaft mbH | Sandmann B.,Ingenieurgruppe Flosser GmbH | Lonsdorfer B.,Regierungsprasidium Freiburg
Bautechnik | Year: 2015

Abstract This report deals with the essential planning details of a new intake structure for a flood retention basin in the regulated area of the Rhine, as well as with the collaboration between hydraulic, structural and soil engineers. The particular position of the structure places high demands on various factors, ranging from flood safety, the safety of the excavation pit in the dam, which is also under strain from the pressure of the water, right up to safe energy conversion downstream from the structure. The structure is currently under construction and a fish pass is also being incorporated in it. Copyright © 2015 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.

Staude S.,University of Tübingen | Werner W.,Regierungsprasidium Freiburg | Mordhorst T.,University of Tübingen | Wemmer K.,Geowissenschaftliches Zentrum Gottingen | And 2 more authors.
Mineralium Deposita | Year: 2012

The Wittichen Co-Ag-Bi-U mining area (Schwarzwald ore district, SW Germany) hosts several unconformity-related vein-type mineralizations within Variscan leucogranite and Permian to Triassic redbeds. The multistage mineralization formed at the intersection of two fault systems in the last 250 Ma. A Permo-Triassic ore stage I with minor U-Bi-quartz-fluorite mineralization is followed by a Jurassic to Cretaceous ore stage II with the main Ag and Co mineralization consisting of several generations of gangue minerals that host the sub-stages of U-Bi, Bi-Ag, Ni-As-Bi and Co-As-Bi. Important ore minerals are native elements, Co and Ni arsenides, and pitchblende; sulphides are absent. The Miocene ore stage III comprises barite with the Cu-Bi sulfosalts emplectite, wittichenite and aikinite, and the sulphides anilite and djurleite besides native Bi, chalcopyrite, sphalerite, galena and tennantite. The mineral-forming fluid system changed from low salinity (<5 wt.% NaCl) at high temperature (around 300°C) in Permian to highly saline (around 25 wt.% NaCl + CaCl 2) at lower temperatures (50-150°C) in Triassic to Cretaceous times. Thermodynamic calculations and comparison with similar mineralizations worldwide show that the Mesozoic ore-forming fluid was alkaline with redox conditions above the hematite-magnetite buffer. We suggest that the precipitation mechanism for native elements, pitchblende and arsenides is a decrease in pH during fluid mixing processes. REE patterns in fluorite and the occurrence of Bi in all stages suggest a granitic source of some ore-forming elements, whereas, e.g. Ag, Co and Ni probably have been leached from the redbeds. The greater importance of Cu and isotope data indicates that the Miocene ore stage III is more influenced by fluids from the overlying redbeds and limestones than the earlier mineralization stages. © 2011 Springer-Verlag.

Schneider-Ritter U.,Regierungsprasidium Freiburg
WasserWirtschaft | Year: 2011

The Water Framework Directive (WFD) aims at reaching the "good ecological status" in a water body. For this purpose, the quality of the habitat of animals and plants has to be evaluated. Using the example of the resettlement of migratory fish In the River Rhine, it can be demonstrated that the success of measures like fish ladders and bypasses mainly depends on whether the entire water system has been taken into account.

Microsedimentological analyses were used to examine the first 56m of a 500m core near Heidelberg, Germany, in the Upper Rhine Valley. This core chronostratigraphically stretches from present day to 450 ka and includes proxy evidence supporting the presence of Würmian, Eemian and likely components of the Riss and Hoβkirch Stages. The sediment in the core reflects the geomorphic, biotic, pedogenic, and climatic processes. The sediments were deposited in a fluvial environment, at times, within a broad floodplain in the main channel, and also, at other times, some distance from the main river. These upper sediments act as indirect proxy evidence that indicate changes in climate over time illustrative of cool periglacial tundra-like conditions and of milder forested temperate environments from Hoβkirch to present day times. Within the sediments evidence can be found of an interglacial fossil soil followed later by a Holocene temperate climate up to present day. A strong link can be ascertained between macro- and micro-stratigraphic evidence, the latter revealing detailed and invaluable sources of information. This analysis permits the reconstruction of past climate and paleoenvironmental conditions. The application of microsedimentological analyses to the Mannheim Formation reveals a store of data that has been largely hidden when using only macro-sedimentological methods. © 2015 Elsevier Ltd and INQUA.

Stober I.,Regierungsprasidium Freiburg | Jodocy M.,Regierungsprasidium Freiburg
Grundwasser | Year: 2011

The District Authority (Regierungspräsidium) Freiburg interpreted reflective seismic data for the region of Hartheim south of the Kaiserstuhl (Upper Rhine Graben). The seismic data were used to determine the position of the inner fault zone of the Upper Rhine Graben in this area, combined with parameters of depth and thickness for the most important hydrogeothermal reservoirs of the Hauptrogenstein (Middle Jura), Oberer Muschelkalk and Buntsandstein. The inner fault zone shows an offset of up to 3 000 m, that separates the deep subsided inner zone of the Upper Rhine Graben (basin of Hartheim) in the west from the shallower parts in the east (Tuniberg, Freiburger Bucht). In the subsided inner zone of the Upper Rhine Graben temperatures of 130 °C at a depth of 3 000 m or 150 °C in a depth of 3 500 m can be expected. Estimated hydraulic conductivities for the aquifers of the Hauptrogenstein and Oberer Muschelkalk average at T/H=2·10-6 m2/s with significant standard deviations. The Buntsandstein delivered only a few values. The deep seated waters in the inner zone of the Upper Rhine Graben are dominated by natrium and chloride, showing total dissolved solids (TDS) of several 10s g/l. Waters with the highest value for TDS can be found in the Hauptrogenstein aquifer. © 2011 Springer-Verlag.

Stober I.,Regierungsprasidium Freiburg | Jodocy M.,Regierungsprasidium Freiburg | Hintersberger B.,Regierungsprasidium Freiburg
Zeitschrift der Deutschen Gesellschaft fur Geowissenschaften | Year: 2013

Using different methods hydraulic conductivities were determined in the deep Upper Jurassic aquifer of the Molasse Basin in SW-Germany. We compared the results with each other, discussed the differences, and tried to explain the causes of distinctions. The results were used to enlarge our reliable dataset of rock permeabilities we determined by evaluating hydraulic tests. © 2013 E. Schweizerbart'sche Verlagsbuchhandlung, Stuttgart, Germany.

The effects of failed borehole heat exchanger drillings in the German town Staufen i. Br. show distinctly the hazards, which can arise from borehole heat exchanger drillings spanning multi groundwater storeys with potential difference of the penetrated groundwater storeys. Groundwater flow induced the discharge of annular sealing in the annulus of the borehole heat exchanger drilling. Under the encountered hydrological boundary conditions, this caused the failure of the required separation of the groundwater storeys in one or more annular sealing. Water influx in previously dry, swellable geological layers caused the so-called "Gipskeuperquellen" (swelling of the gypsum-containing Upper Triassic Grabfeld formation). This water influx could be suppressed by damage-limiting measures (post-grouting of the borehole heat exchanger, permanent groundwater lowering). It is not possible to reclaim water that ingressed into swellable geological layers neither by hydraulic nor by other measures. Thus, the ground heave will continue until the ingressed water is completely exhausted by the swelling process. The initiated damage-limiting measures succeed. As a result, the maximum heave rate has decelerated from 11 mm/month at the beginning to currently approximately 3.5 mm/month. Since autumn 2012, the ground heave measurements indicate, that the linear deceleration of the process observed until now does not continue unchanged. By modelling it became clear, that the groundwater pumping has to be continued to avoid more uplift and further swell processes. Experiences from the case Staufen i. Br. show impressively, that a thorough pre-investigation immediately followed by the initiation of defensive/control measures are absolutely necessary in case of damaging events caused by failed borehole heat exchanger drillings. Copyright © 2013 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.

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