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Geodetic monitoring of subrosion-induced subsidence processes in urban areas / Tobias Kersten in Journal of applied geodesy, vol 11 n° 1 (March 2017)  

Public [article]  inJournal of applied geodesy > vol 11 n° 1 (March 2017) . - pp 21 - 30 Titre : Geodetic monitoring of subrosion-induced subsidence processes in urban areas Type de document : Article/Communication Auteurs : Tobias Kersten, Auteur ; Martin Kobe, Auteur ; Gerald Gabriel, Auteur ; Ludger Timmen, Auteur ; Steffen Schön, Auteur ; Detlef Vogel, Auteur Année de publication : 2017 Article en page(s) : pp 21 - 30 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale [Termes IGN] église [Termes IGN] gravimétrie [Termes IGN] Hambourg [Termes IGN] nivellement [Termes IGN] positionnement par GNSS [Termes IGN] réseau de surveillance géophysique [Termes IGN] subsidence [Termes IGN] surveillance géologique [Termes IGN] Thuringe [Termes IGN] tour (bâtiment) [Termes IGN] zone urbaine Résumé : (Résumé) The research project SIMULTAN applies an advanced combination of geophysical, geodetic, and modelling techniques to gain a better understanding of the evolution and characteristics of sinkholes. Sinkholes are inherently related to surface deformation and, thus, of increasing societal relevance, especially in dense populated urban areas. One work package of SIMULTAN investigates an integrated approach to monitor sinkhole-related mass translations and surface deformations induced by salt dissolution. Datasets from identical and adjacent points are used for a consistent combination of geodetic and geophysical techniques. Monitoring networks are established in Hamburg and Bad Frankenhausen (Thuringia). Levelling surveys indicate subsidence rates of about 4–5 mm per year in the main subsidence areas of Bad Frankenhausen with a local maximum of 10 mm per year around the leaning church tower. Here, the concept of combining geodetic and gravimetric techniques to monitor and characterise geological processes on and below the Earth's surface is exemplary discussed for the focus area Bad Frankenhausen. For the different methods (levelling, GNSS, relative/absolute gravimetry) stable network results at identical points are obtained by the first campaigns, i.e., the results are generally in agreement. Numéro de notice : A2017-281 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1515/jag-2016-0029 En ligne : https://doi.org/10.1515/jag-2016-0029 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=85314 [article]

Einsatz der Atominterferometrie in der Geodäsie / M. Schilling in ZFV, Zeitschrift für Geodäsie, Geoinformation und Landmanagement, vol 137 n° 3 (01/06/2012)

Public [article]  inZFV, Zeitschrift für Geodäsie, Geoinformation und Landmanagement > vol 137 n° 3 (01/06/2012) . - pp 185 - 194 Titre : Einsatz der Atominterferometrie in der Geodäsie Type de document : Article/Communication Auteurs : M. Schilling, Auteur ; J. Muller, Auteur ; Ludger Timmen, Auteur Année de publication : 2012 Article en page(s) : pp 185 - 194 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Géodésie physique [Termes IGN] atome [Termes IGN] gravimétrie [Termes IGN] interféromètre au laser Résumé : (Auteur) The interferometry of mater waves, i.e. the exploitation of the wave characteristics of matter by manipulating the internal states of atoms with lasers, is of increasing interest for geodesy. This article gives a short introduction in the theoretical background of atom interferometry and describes possible applications in geodesy with emphasis on gravimetry. The limiting factors of state-of-the-art relative and absolute gravimeters are presented. The potential of the new technology is discussed. Particular attention is paid to the operation outside of controlled laboratory environments, an important prerequisite for future use in geodesy. Numéro de notice : A2012-271 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31717 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
199-2012031	RSREV	Revue	Centre de documentation	Revues en salle	Disponible

Absolute and relative gravimetry 1990-1992-1995 in the Western Yunnan earthquake prediction experimental area / Wolfgang Torge (1999)

Public Titre : Absolute and relative gravimetry 1990-1992-1995 in the Western Yunnan earthquake prediction experimental area Type de document : Monographie Auteurs : Wolfgang Torge, Auteur ; M. Schnull, Auteur ; Ludger Timmen, Auteur ; J. Minyu, Auteur ; X. Canfei, Auteur ; L. Hui, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 1999 Collection : DGK - B Sous-collection : Angewandte Geodäsie num. 307 Importance : 48 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-8587-9 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique [Termes IGN] Chine [Termes IGN] gravimètre absolu [Termes IGN] gravimètre supraconducteur [Termes IGN] gravimétrie [Termes IGN] levé gravimétrique [Termes IGN] Pékin (Chine) [Termes IGN] prédiction [Termes IGN] risque naturel [Termes IGN] séisme Index. décimale : 30.43 Travaux de géodésie physique Résumé : (Auteur) The Western Yunnan Earthquake Prediction Experimental Area (WYEPEA) has been established in the middle of the 1980's by the State Seismological Bureau (SSB) of China, in order to study the geodynamic processes occurring in this region of high seismic activity. Absolute gravimetry was introduced into the WYEPEA gravity control in 1990, within the frame of a cooperation project between the Institute of Seismology, State Seismological Bureau (ISSSB), Wuhan, and the Institut für Erdmessung (IfE), University of Hannover, Germany. Three observation campaigns were performed (1990, 1992, 1995) employing the JILAG-3 absolute gravity meter of IfE. Six absolute stations have been established in the area, and additional absolute measurements were carried out in the reference stations Beijing, Wuhan, and Kunming. Relative gravity measurements between the absolute stations served for an independent control and connect the existing GPS control network to the gravity net. In addition, a micro gravity net and a vertical gravity gradient line have been established and remeasured, in order to study local gravity variations at selected fault zones. The accuracy of the absolute gravity results is estimated to ±0.05 µms- while the repeatability is slightly better. In the local systems a relative accuracy of ±0.01 ... 0.03 µms- has been achieved. Large-scale gravity variations with time could not be detected between 1990 and 1995, but local changes due to groundwater-table variations or seismic activity may reach 0.1µms-. In the local systems small gravity changes have been found, with a certain correlation to tectonic structures. The report presents the final results of the project, especially station descriptions and gravity values for the epochs 1990, 1992, and 1995. It thus will serve as a basis for future gravity campaigns, and analyzing gravity changes which might be detected then. Numéro de notice : 57511 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=60224

Exemplaires(2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
57511-01	30.43	Livre	Centre de documentation	Géodésie	Disponible
57511-02	30.43	Livre	Centre de documentation	Géodésie	Disponible

The IFE absolute gravity program "South America" 1988 - 1991 / Wolfgang Torge (1994)

Public Titre : The IFE absolute gravity program "South America" 1988 - 1991 Type de document : Monographie Auteurs : Wolfgang Torge, Auteur ; Ludger Timmen, Auteur ; R. Röder, Auteur ; M. Schnull, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 1994 Collection : DGK - B Sous-collection : Angewandte Geodäsie num. 299 Importance : 44 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-8582-4 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique [Termes IGN] Argentine [Termes IGN] Brésil [Termes IGN] campagne d'observations [Termes IGN] gravimètre absolu [Termes IGN] réseau gravimétrique [Termes IGN] réseau gravimétrique local [Termes IGN] station de référence [Termes IGN] Uruguay [Termes IGN] Vénézuela Index. décimale : 30.42 Gravimétrie Résumé : (Auteur) The Institut für Erdmessung (IFE), University of Hannover, Germany, performed a large-scale gravity control survey between 1988 and 1991 in South America, in cooperation with university institutes and state agencies of the countries involved and supported by "Deutsche Forschungsgemeinschaft (DFG)" and "Institute Pan-americano de Geografia e Historia (IPGH)". This control system covers a large part of South America by establishing 22 absolute gravity stations with additional local eccenters. After a first observation campaign in Venezuela in 1988 (6 stations), a project in Brazil (7 stations), Uruguay (2 stations) and Argentina (3 stations) has been performed in 1989. A final campaign in 1991 concentrated on Argentina (3 new stations) and Uruguay (1 new station, 1 reoccupied). Three gravity stations (Sta. Elena, Brasilia, Tandil) are part of the International Absolute Gravity Basestation Network (lAGBN.set A). In addition, the stations serve as absolute gravity control for geodynamic networks in the Central and Venezuelan Andes and they improve existing national gravity networks. Numéro de notice : 28254 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=63598

Exemplaires(2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
28254-01	30.42	Livre	Centre de documentation	Géodésie	Disponible
28254-02	30.42	Livre	Centre de documentation	Géodésie	Disponible