TY - JOUR A1 - Domsch, Horst A1 - Lück, Erika A1 - Eisenreich, Manfred T1 - Bestimmung der elektrischen Leitfähigkeit des Bodens mit dem Meßgerät EM 38 von Geonics zur Kennzeichnung der Verteilung sich unterscheidender Bodenprofile = Determination of the electrical soil bulk conductivity with the Geonics EM 38 for the identification of the soil types distribution Y1 - 1999 ER - TY - JOUR A1 - Lück, Erika T1 - Erkundungen eines archäologischen Grabenwerkes mittels Georadar Y1 - 2000 ER - TY - JOUR A1 - Lück, Erika A1 - Eisenreich, Manfred T1 - Kartierung der elektrischen Leitfähigkeit zur Erfassung räumlicher Variationen von Bodenparametern Y1 - 1999 ER - TY - JOUR A1 - Lück, Erika A1 - Eisenreich, Manfred A1 - Domsch, Horst T1 - Einführung geophysikalischer Meßverfahren zur Ermittlung von Bodenkennwerten für die teilflächenspezifische Bewirtschaftung in der KSG Agrargesellschaft mbH Kassow Y1 - 2000 ER - TY - JOUR A1 - Domsch, Horst A1 - Ehlert, D. A1 - Lück, Erika A1 - Eisenreich, Manfred T1 - Use of the electrical conductivity to reduce the effort of precision farming Y1 - 2000 ER - TY - BOOK A1 - Lück, Erika A1 - Eisenreich, Manfred A1 - Domsch, Horst ED - Blumenstein, Oswald T1 - Innovative Kartiermethoden für die teilflächenspezifische Landwirtschaft : innovative Methods for Precision Agriculture T3 - Stoffdynamik in Geosystemen Y1 - 2002 SN - 0949-4731 VL - 7 PB - Selbstverl. der Arbeitsgruppe Stoffdynamik in Geosystemen CY - Potsdam ER - TY - JOUR A1 - Lück, Erika T1 - Geophysikalische Prospektionsmethoden für die Archäologie Y1 - 2000 SN - 3-931836-16-9 ER - TY - JOUR A1 - Lück, Erika A1 - Meyer, M. T1 - Geophysical preparation of an archaeological excavation in the highlands (Mardorf, Hessen) Y1 - 1999 ER - TY - JOUR A1 - Lück, Erika A1 - Eisenreich, Manfred A1 - Spangenberg, Ute A1 - Schütte, Marc T1 - Automatisierung der Leckageerkennung an Deponieoberflächenabdichtungen Y1 - 2000 ER - TY - JOUR A1 - Lück, Erika A1 - Eisenreich, Manfred A1 - Blumenstein, Oswald A1 - Domsch, Horst T1 - Geophysikalische Untersuchungen zur Erfassung räumlicher und zeitlicher Variationen von Bodenstrukturen Y1 - 1998 ER - TY - JOUR A1 - Domsch, Horst A1 - Lück, Erika A1 - Eisenreich, Manfred T1 - Description o a soil structure by means of the penetration resistance and the electrical conductivity Y1 - 1998 ER - TY - JOUR A1 - Lück, Erika A1 - Eisenreich, Manfred T1 - Die elektrische Leitfähigkeit als eine Steuergröße für die teilflächenspezifische Landwirtschaft Y1 - 1998 ER - TY - JOUR A1 - Lück, Erika T1 - Deep crustal structure of the Northeast German Basin : new DEKORP-BASIN ï96 deep-profiling results Y1 - 1999 SN - 0091-7613 ER - TY - JOUR A1 - Lück, Erika A1 - Eisenreich, Manfred T1 - Geophysikalische Meßverfahren zur Ermittlung von Bodenkennwerten für die teilflächenspezifische Bewirtschaftung Y1 - 1999 ER - TY - JOUR A1 - Lück, Erika A1 - Eisenreich, Manfred A1 - Wetzel, G. T1 - Geophysikalische Untersuchungen zur Erkundung der Kreisgrabenanlage bei Dyrotz (Brandenburg) Y1 - 1998 ER - TY - JOUR A1 - Lück, Erika A1 - Eisenreich, Manfred T1 - Geophysical prospections of archaeological sites in Brandenburg Y1 - 1998 ER - TY - JOUR A1 - Lück, Erika A1 - Eisenreich, Manfred T1 - Geophysical prospection of archaeological sites in Brandenburg Y1 - 1999 ER - TY - JOUR A1 - Lück, Erika A1 - Rühlmann, Jörg T1 - Resistivity mapping with GEOPHILUS ELECTRICUS - Information about lateral and vertical soil heterogeneity JF - Geoderma : an international journal of soil science N2 - GEOPHILUS ELECTRICUS (nickname GEOPHILUS) is a novel system for mapping the complex electrical bulk resistivity of soils. Rolling electrodes simultaneously measure amplitude and phase data at frequencies ranging from 1 mHz to 1 kHz. The sensor's design and technical specifications allow for measuring these parameters at five depths of up to ca. 1.5 m. Data inversion techniques can be employed to determine resistivity models instead of apparent values and to image soil layers and their geometry with depth. When used in combination with a global positioning system (GPS) and a suitable cross-country vehicle, it is possible to map about 100 ha/day (assuming 1 data point is recorded per second and the line spacing is 18 m). The applicability of the GEOPHILUS system has been demonstrated on several sites, where soils show variations in texture, stratification, and thus electrical characteristics. The data quality has been studied by comparison with 'static' electrodes, by repeated measurements, and by comparison with other mobile conductivity mapping devices (VERIS3100 and EM38). The high quality of the conductivity data produced by the GEOPHILUS system is evident and demonstrated by the overall consistency of the individual maps, and in the clear stratification also confirmed by independent data. The GEOPHILUS system measures complex values of electrical resistivity in terms of amplitude and phase. Whereas electrical conductivity data (amplitude) are well established in soil science, the interpretation of phase data is a topic of current research. Whether phase data are able to provide additional information depends on the site-specific settings. Here, we present examples, where phase data provide complementary information on man-made structures such as metal pipes and soil compaction. KW - Proximal soil sensing KW - Electrical conductivity KW - Electrical resistivity KW - Phase angle KW - Mapping KW - Soil stratification Y1 - 2013 U6 - https://doi.org/10.1016/j.geoderma.2012.11.009 SN - 0016-7061 VL - 199 SP - 2 EP - 11 PB - Elsevier CY - Amsterdam ER - TY - JOUR A1 - Stiller, M. A1 - Lück, Erika A1 - Krawczyk, C. M. T1 - DEKORPïs deep-seismic Transect BASINï96 throught the north german basin : field work and data processing Y1 - 1997 ER - TY - JOUR A1 - Walter, J. A1 - Lück, Erika A1 - Heller, C. A1 - Bauriegel, Albrecht A1 - Zeitz, Jutta T1 - Relationship between electrical conductivity and water content of peat and gyttja BT - implications for electrical surveys of drained peatlands JF - Near surface geophysics N2 - The application of electrical resistivity tomography to peatlands supports conventional coring by providing data on the current condition of peatlands, including data on stratigraphy, peat properties and thickness of organic deposits. Data on the current condition of drained peatlands are particularly required to improve estimates of carbon storage as well as losses and emissions from agriculturally used peatlands. However, most of the studies focusing on electrical resistivity tomography surveys have been conducted on natural peatlands with higher groundwater levels. Peatlands drained for agriculture have not often been studied using geophysical techniques. Drained sites are characterized by low groundwater levels and high groundwater fluctuations during the year, which lead to varying levels of water saturation. To validate better electrical resistivity tomography surveys of drained peatlands, the aim of this laboratory study is to investigate the influence of varying water saturation levels on electrical conductivity (reciprocal of resistivity) for a variety of peat and gyttja types, as well as for different degrees of peat decomposition. Results show that different levels of water saturation strongly influence bulk electrical conductivity. Distinct differences in this relationship exist between peat and gyttja substrates and between different degrees of peat decomposition. Peat shows an exponential relationship for all degrees of decomposition, whereas gyttja, in particular organic-rich gyttja, is characterized by a rather unimodal relationship. The slopes for the relationship between electrical conductivity and water content are steeper at high degrees of decomposition than for peat of low degrees of decomposition. These results have direct implications for field electrical resistivity tomography surveys. In drained peatlands that are strongly susceptible to drying, electrical resistivity tomography surveys have a high potential to monitor the actual field water content. In addition, at comparable water saturations, high or low degrees of decomposition can be inferred from electrical conductivity. KW - Electrical conductivity KW - Peat KW - Gyttja Y1 - 2019 U6 - https://doi.org/10.1002/nsg.12030 SN - 1569-4445 SN - 1873-0604 VL - 17 IS - 2 SP - 169 EP - 179 PB - Wiley CY - Hoboken ER - TY - JOUR A1 - Simpson, David A1 - Van Meirvenne, Marc A1 - Luck, Erika A1 - Bourgeois, Jean A1 - Ruhlmann, Jörg T1 - Prospection of two circular Bronze Age ditches with multi-receiver electrical conductivity sensors (North Belgium) N2 - Two types of electrical conductivity sensors were evaluated to prospect circular ditches surrounding former Bronze Age burial mounds, complementing aerial photography. The first sensor was based on the electrical resistivity (ER) method, while the second sensor was based on frequency-domain electromagnetic induction (FDEM). Both sensors were designed with multiple receivers, which measure several depth sensitivities simultaneously. First, the sensors were tested on an experimental site where a rectangular structure with limited dimensions was dug in a sandy soil. The structure appeared as a higher conductivity anomaly in the low-conductivity sand. Then, both methods were applied on two Bronze Age sites with different soil properties, which were discovered by aerial photography. The first site, in a sandy soil, gave only very weak anomalies. Soil augering revealed that the ditch filling consisted of the same sandy material as the surrounding, therefore this filling was not able to cause a high-conductivity contrast. Due to its lower sensitivity to noise in the low-conductive range, the ER-sensor produced a more pronounced anomaly than the FDEM-sensor. The second site was located on top of a ridge with a shallow substrate of Tertiary, coastal sediments. The ditch was very clearly visible on the sensor maps as a conductive low. At this location, the soil augering revealed that the ditch was dug through an alternating clay-sand layer and subsequently filled up with silty material from the topsoil. Overall, the shallow receiver separation produced anomalies that were both stronger and that corresponded better to the geometry of the ditches. The other receiver separations provided more information on the natural soil layering, and in the case of the ER-array they could be used to obtain a cross-section of the actual electrical conductivity with 2-D inversion modelling. The results of this study proofed that conductivity sensors can detect Bronze Age ditches, with varying contrast depending on the soil geomorphology. Moreover, the sensor maps combined with soil observations by coring provided insight in the environmental conditions that influence the contrast of the anomalies seen on the aerial photographs and the sensor maps. Y1 - 2010 UR - http://www.sciencedirect.com/science/journal/03054403 U6 - https://doi.org/10.1016/j.jas.2010.03.017 SN - 0305-4403 ER - TY - JOUR A1 - Lück, Erika A1 - Müller, Martin T1 - Special section on the application of geophysics in agriculture : part II ; foreword Y1 - 2009 SN - 1569-4445 ER - TY - JOUR A1 - Lück, Erika A1 - Eisenreich, Manfred A1 - Domsch, Horst A1 - Blumenstein, Oswald T1 - Mapping of soil characteristics using geophysical methods Y1 - 1997 SN - 0943-7266 ER - TY - JOUR A1 - Krawczyk, C. M. A1 - Lück, Erika A1 - Stiller, M. T1 - The structure of the North German Basin - the DEKORP-Experiment BASIN'96 Y1 - 1997 SN - 90-73834-04-X ER - TY - JOUR A1 - Lück, Erika A1 - Eisenreich, Manfred A1 - Domsch, Horst T1 - Geophysikalische Kennwerte zur Kennzeichnung landwirtschaftlicher Flächen für die teilflächenspezifische Bewirtschaftung Y1 - 1998 ER - TY - JOUR A1 - Lück, Erika A1 - Eisenreich, Manfred A1 - Lochter, F. T1 - Geophysikalische Erkundungen einer neolithischen Doppelkreigrabenanlage im Land Brandenburg Y1 - 1998 ER - TY - JOUR A1 - Lück, Erika A1 - Eisenreich, Manfred A1 - Wetzel, G. T1 - Magnetische Kartierung einer Kreisgrabenanlage im Oderbruch bei Platkow, Lankreis Märkisch-Oderland Y1 - 1997 ER - TY - JOUR A1 - Lück, Erika A1 - Eisenreich, Manfred T1 - Fallbeispiele für die Kartierung der elektrischen Leitfähigkeit Y1 - 1997 ER - TY - JOUR A1 - Herbst, R. A1 - Kapp, Ingo A1 - Krummel, H. A1 - Lück, Erika T1 - Seismic sources for shallow investigatons : a field comparison from Northern Germany Y1 - 1998 ER - TY - JOUR A1 - Lück, Erika A1 - Herbst, R. T1 - Widerstandskartierung einer Kreisgrabenanlage im Oderbruch bei Quappendorf, Landkreis Märkisch-Oderland Y1 - 1997 ER - TY - JOUR A1 - Frischbutter, A. A1 - Lück, Erika T1 - Eine überarbeitete Variante zum tiefenseismischen Profil Grimma-Buckow Y1 - 1997 ER - TY - JOUR A1 - Lück, Erika A1 - Gebbers, Robin A1 - Ruehlmann, Joerg A1 - Spangenberg, Ulrike T1 - Electrical conductivity mapping for precision farming N2 - Precision farming overcomes the paradigm of uniform field treatment by site-specific data acquisition and treatment to cope with within-field variability. Precision farming heavily relies on spatially dense information about soil and crop status. While it is often difficult and expensive to obtain precise soil information by traditional soil sampling and laboratory analysis some geophysical methods offer means to obtain subsidiary data in an efficient way. In particular, geoelectrical soil mapping has become widely accepted in precision farming. At present it is the most successful geophysical method providing the spatial distribution of relevant agronomic information that enables us to determine management zones for precision farming. Much work has been done to test the applicability of existing geoelectrical methods and to develop measurement systems applicable in the context of precision farming. Therefore, the aim of this paper was to introduce the basic ideas of precision farming, to discuss current precision farming applied geoelectrical methods and instruments and to give an overview about our corresponding activities during recent years. Different experiments were performed both in the laboratory and in the field to estimate first, electrical conductivity affecting factors, second, relationships between direct push and surface measurements, third, the seasonal stability of electrical conductivity patterns and fourth, the relationship between plant yield and electrical conductivity. From the results of these experiments, we concluded that soil texture is a very dominant factor in electrical conductivity mapping. Soil moisture affects both the level and the dynamic range of electrical conductivity readings. Nevertheless, electrical conductivity measurements can be principally performed independent of season. However, electrical conductivity field mapping does not produce reliable maps of spatial particle size distribution of soils, e.g., necessary to generate input parameters for water and nutrient transport models. The missing step to achieve this aim may be to develop multi-sensor systems that allow adjusting the electrical conductivity measurement from the influence of different soil water contents. Y1 - 2009 UR - http://nsg.eage.org/ U6 - https://doi.org/10.3997/1873-0604.2008031 SN - 1569-4445 ER - TY - JOUR A1 - Simpson, David A1 - Van Meirvenne, Marc A1 - Luck, Erika A1 - Ruhlmann, Jörg A1 - Saey, Timothy A1 - Bourgeois, Jean T1 - Sensitivity of multi-coil frequency domain electromagnetic induction sensors to map soil magnetic susceptibility N2 - Magnetic susceptibility is an important indicator of anthropogenic disturbance in the natural soil. This property is often mapped with magnetic gradiometers in archaeological prospection studies. It is also detected with frequency domain electromagnetic induction (FDEM) sensors, which have the advantage that they can simultaneously measure the electrical conductivity. The detection level of FDEM sensors for magnetic structures is very dependent on the coil configuration. Apart from theoretical modelling studies, a thorough investigation with field models has not been conducted until now. Therefore, the goal of this study was to test multiple coil configurations on a test field with naturally enhanced magnetic susceptibility in the topsoil and with different types of structures mimicking real archaeological features. Two FDEM sensors were used with coil separations between 0.5 and 2 m and with three coil orientations. First, a vertical sounding was conducted over the undisturbed soil to test the validity of a theoretical layered model, which can be used to infer the depth sensitivity of the coil configurations. The modelled sounding values corresponded well with the measured data, which means that the theoretical models are applicable to layered soils. Second, magnetic structures were buried in the site and the resulting anomalies measured to a very high resolution. The results showed remarkable differences in amplitude and complexity between the responses of the coil configurations. The 2-m horizontal coplanar and 1.1-m perpendicular coil configurations produced the clearest anomalies and resembled best a gradiometer measurement. Y1 - 2010 UR - http://www3.interscience.wiley.com/cgi-bin/issn?DESCRIPTOR=PRINTISSN&VALUE=1351-0754 U6 - https://doi.org/10.1111/j.1365-2389.2010.01261.x SN - 1351-0754 ER - TY - JOUR A1 - Stiller, M. A1 - Krawczyk, C. M. A1 - Lück, Erika T1 - The northern rim of the central european basin system : first results of the offshore-onshore survey BASINï96 Y1 - 1997 ER - TY - JOUR A1 - Lück, Erika A1 - Stiller, M. A1 - Krawczyk, C. M. T1 - Wide angle seismics of Basinï96 Y1 - 1997 ER - TY - JOUR A1 - Lück, Erika A1 - Eisenreich, Manfred A1 - Spangenberg, Ute A1 - Christl, G. T1 - A note on geophysical prospection of archaeological structures in urban contexts in Potsdam (Germany) Y1 - 1997 ER - TY - JOUR A1 - Lück, Erika A1 - Rühlmann, Jörg A1 - Kirchmann, Holger T1 - Properties of soils from the Swedish long-term fertility experiments VI. Mapping soil electrical conductivity with different geophysical methods JF - Acta agriculturae Scandinavica : Section B, Soil and plant science N2 - Swedish long-term soil fertility experiments were used to investigate the effect of texture and fertilization regime on soil electrical conductivity. In one geophysical approach, fields were mapped to characterize the horizontal variability in apparent electrical conductivity down to 1.5 m soil depth using an electromagnetic induction meter (EM38 device). The data obtained were geo-referenced by dGPS. The other approach consisted of measuring the vertical variability in electrical conductivity along transects using a multi-electrode apparatus for electrical resistivity tomography (GeoTom RES/IP device) down to 2 m depth. Geophysical field work was complemented by soil analyses. The results showed that despite 40 years of different fertilization regimes, treatments had no significant effects on the apparent electrical conductivity. Instead, the comparison of sites revealed high and low conductivity soils, with gradual differences explained by soil texture. A significant, linear relationship found between apparent electrical conductivity and soil clay content explained 80% of the variability measured. In terms of soil depth, both low and high electrical conductivity values were measured. Abrupt changes in electrical conductivity within a field revealed the presence of 'deviating areas'. Higher values corresponded well with layers with a high clay content, while local inclusions of coarse-textured materials caused a high variability in conductivity in some fields. The geophysical methods tested provided useful information on the variability in soil texture at the experimental sites. The use of spatial EC variability as a co-variable in statistical analysis could be a complementary tool in the evaluation of experimental results. KW - Conductivity depth model KW - conductivity map KW - electrical resistivity KW - soil heterogeneity Y1 - 2011 U6 - https://doi.org/10.1080/09064710.2010.502124 SN - 0906-4710 VL - 61 IS - 5 SP - 438 EP - 447 PB - Taylor & Francis Group CY - Oslo ER - TY - JOUR A1 - Walter, J. A1 - Hamann, Göran A1 - Lück, Erika A1 - Klingenfuss, C. A1 - Zeitz, Jutta T1 - Stratigraphy and soil properties of fens: Geophysical case studies from northeastern Germany JF - Catena : an interdisciplinary journal of soil science, hydrology, geomorphology focusing on geoecology and landscape evolution N2 - The determination of the total carbon storage of peatlands is of high relevance in the context of climate-change mitigation efforts. This determination relies on data about stratigraphy and peat properties, which are conventionally collected by coring. Ground-penetrating radar (GPR) and electrical resistivity imaging (ERI) can support these point data by providing subsoil information in two-dimensional cross-sections. In this study, GPR and ERI were conducted at two groundwater-fed fen sites located in the temperate zone in north-east Germany. The fens of this region are embedded in low conductive glacial sand and are characterised by thick layers of gyttja, which can be either mineral or organic. The two study sites are representative of this region with respect to stratigraphy (total thickness, peat and gyttja types) and ecological conditions (pH-value, trophic condition). The aim of this study is to assess the suitability of GPR and ERI to detect stratigraphy and peat properties under these characteristic site conditions. Results show that GPR clearly detects the interfaces between (i) Carex and brown-moss peat, (ii) brown-moss peat and organic gyttja, (iii) organic- and mineral gyttja, and (iv) mineral gyttja and the parent material (glacial sand). These layers differ in bulk density and the related organic matter content. ERI, however, does not delineate these layers; rather it delineates regions of varying properties. At our base-rich site, pore fluid conductivity and cation.exchange capacity are the main factors that determine peat electrical conductivity (reverse of resistivity), whereas organic matter and water content are most influential at the more acidic site. Thus the correlation between peat properties and electrical conductivity are driven by site-specific conditions, which are mainly determined by the solute load in the groundwater at fens. When the total organic deposits exceed a thickness of 5 m, the depth of investigation by GPR is limited due to increasing attenuation. This is not a limiting factor for ERI, where the transition from organic deposits to glacial sand is visible at both sites. Due to these specific sensitivities, a combined application of GPR and ERI meets the demand for up-to-date information on carbon storage of peatlands, which is, moreover, very site-specific because of the inherent variety of ecological conditions and stratigraphy between peatlands in general and between fens and bogs in particular. (C) 2016 Elsevier B.V. All rights reserved. KW - Fen stratigraphy KW - Peat properties KW - Gyttja KW - Ground penetrating radar KW - Electrical conductivity KW - Electrical resistivity imaging Y1 - 2016 U6 - https://doi.org/10.1016/j.catena.2016.02.028 SN - 0341-8162 SN - 1872-6887 VL - 142 SP - 112 EP - 125 PB - Elsevier CY - Amsterdam ER - TY - JOUR A1 - Bönecke, Eric A1 - Lück, Erika A1 - Rühlmann, Jörg A1 - Gründling, Ralf A1 - Franko, Uwe T1 - Determining the within-field yield variability from seasonally changing soil conditions JF - Precision Agriculture N2 - Crop yield variations are strongly influenced by the spatial and temporal availabilities of water and nitrogen in the soil during the crop growth season. To estimate the quantities and distributions of water and nitrogen within a given soil, process-oriented soil models have often been used. These models require detailed information about the soil characteristics and profile architecture (e.g., soil depth, clay content, bulk density, field capacity and wilting point), but high resolution information about these soil properties, both vertically and laterally, is difficult to obtain through conventional approaches. However, on-the-go electrical resistivity tomography (ERT) measurements of the soil and data inversion tools have recently improved the lateral resolutions of the vertically distributed measurable information. Using these techniques, nearly 19,000 virtual soil profiles with defined layer depths were successfully created for a 30 ha silty cropped soil over loamy and sandy substrates in Central Germany, which were used to initialise the CArbon and Nitrogen DYnamics (CANDY) model. The soil clay content was derived from the electrical resistivity (ER) and the collected soil samples using a simple linear regression approach (the mean R-2 of clay = 0.39). The additional required structural and hydrological properties were derived from pedotransfer functions. The modelling results, derived soil texture distributions and original ER data were compared with the spatial winter wheat yield distribution in a relatively dry year using regression and boundary line analysis. The yield variation was best explained by the simulated soil water content (R-2 = 0.18) during the grain filling and was additionally validated by the measured soil water content with a root mean square error (RMSE) of 7.5 Vol%. KW - Soil process modelling KW - Electrical resistivity tomography (ERT) KW - Soil water variability KW - Boundary line analysis Y1 - 2018 U6 - https://doi.org/10.1007/s11119-017-9556-z SN - 1385-2256 SN - 1573-1618 VL - 19 IS - 4 SP - 750 EP - 769 PB - Springer CY - Dordrecht ER - TY - JOUR A1 - Lück, Erika A1 - Eisenreich, Manfred A1 - Domsch, Horst A1 - Blumenstein, Oswald T1 - Geophysik für Landwirtschaft und Bodenkunde JF - Stoffdynamik in Geosystemen Y1 - 2000 SN - 0949-4731 VL - 4 PB - Selbstverl. der Arbeitsgruppe Stoffdynamik in Geosystemen CY - Potsdam ER - TY - CHAP A1 - Lück, Erika T1 - Geophysik für den oberflächennahen Bereich (Landwirtschaft, Bodenkunde, Archäologie, Umwelt usw.) N2 - Dokument 1: Foliensatz | Dokument 2: Animation