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Estimating sea floor dynamics in the southern North Sea to improve bathymetric survey planning / L. Dorst (2009)
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Titre : Estimating sea floor dynamics in the southern North Sea to improve bathymetric survey planning Type de document : Thèse/HDR Auteurs : L. Dorst, Auteur Editeur : Delft : Netherlands Geodetic Commission NGC Année de publication : 2009 Collection : Netherlands Geodetic Commission Publications on Geodesy, ISSN 0165-1706 num. 69 Importance : 220 p. Format : 17 x 24 cm ISBN/ISSN/EAN : 978-90-6132-311-2 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bathymétrie
[Termes IGN] bathymétrie
[Termes IGN] covariance
[Termes IGN] déformation de la croute terrestre
[Termes IGN] fond marin
[Termes IGN] géodynamique
[Termes IGN] géostatistique
[Termes IGN] interpolation
[Termes IGN] krigeage
[Termes IGN] marée océanique
[Termes IGN] morphogenèse
[Termes IGN] nivellement indirect
[Termes IGN] Nord, mer du
[Termes IGN] océanographie dynamique
[Termes IGN] port
[Termes IGN] relèvement
[Termes IGN] Rotterdam (Pays-Bas)
[Termes IGN] sable
[Termes IGN] vagueIndex. décimale : 32.10 Bathymétrie Résumé : (Auteur) Safe nautical charts require a carefully designed bathymetric survey policy, especially in shallow sandy seas that potentially have dynamic sea floor patterns. Bathymetric resurveying at sea is a costly process with limited resources, though. A pattern on the sea floor known as tidal sand waves is clearly present in bathymetric surveys, endangering navigation in the Southern North Sea because of the potential dynamics of this pattern. An important factor in an efficient resurvey policy is the type and size of sea floor dynamics. The uncertainties of measurement and interpolation associated with the depth values enable the statistical processing of a time series of surveys, using deformation analysis. Currently, there is no procedure available that satisfies the Royal Netherlands Navy requirements. Therefore, a deformation analysis procedure is designed, implemented and tested in such a way that the procedure works on bathymetric data and satisfies the Royal Netherlands Navy requirements. Also, it is necessary to develop a procedure that translates the results into changes of the resurvey policy, taking into account their confidence intervals.
To describe the sea floor statistically, we assume the sea floor to consist of a spatial trend function (or characterization) and a residual function (or dispersion). Such a description is called a representation. The covariances between positions are expressed in a covariance function, based on the residual function. The covariance function is used by Kriging, an interpolation procedure that propagates the variances and covariances of the data points to variances of the interpolated values. This approach is used widely for spatial analyses, like the interpolation of a bathymetric data set.
The method that we propose uses Kriging to produce a time series of grids of depth values and their variances. Subsequently, it uses deformation analysis, a statistical procedure based on testing theory. Our application of deformation analysis is particularly aimed at the detection of dynamics in areas with tidal sand waves, resulting in parameter estimates for the sea floor dynamics, and their uncertainty. We apply the method to sea floor representations both with and without a sand wave pattern. A test scenario is set up, consisting of a survey of an existing area in the Southern North Sea, for which dynamics are simulated. The results show that the proposed method detects different types of sea floor dynamics well, leading to satisfactory estimates of the corresponding parameters.
We show results for the anchorage area Maas West near the Port of Rotterdam, the Netherlands first. The area is divided into 18 sub-areas. The results show that a sand wave pattern is detected for most of the sub-areas, and a shore-ward migration is detected for a majority of them. The estimated migration rates of the sand waves are up to 7.5 m/yr, with a 95% confidence interval that depends on the regularity of the pattern. The results are in confirmation with previously observed migration rates for the Southern North Sea, and with an idealized process-based model.
Thereafter, we analyze several other areas for which a time series of surveys is available in the bathymetric, archives of the Netherlands Hydrographic Service, to study the spatial variations in sea floor dynamics. We present results for several sand wave areas and a single flat area. In some of those areas, dredging takes place, to guarantee minimum depths. The results indicate sand wave migration in areas close to the coast, and bed level changes of the order of decimeters. The dominant wavelength of the sand waves varies. We compare our results to literature of the same sand wave areas, in which we find similar migration rates, and different wavelengths.
By formulating four indicators, recommendations are made for the resurvey policy on the Belgian and Netherlands Continental Shelf. These indicators follow from the estimates for sea floor dynamics. We present a concept for the shallowest likely depth surface, on which we base two of the indicators. The other two indicators act as a warning: they quantify the potentially missed dynamics, which makes the procedure more robust in case of complicated morphology. We show clear differences in recommended resurvey frequency between the five analyzed regions.
We conclude that the designed method is able to use a time series of bathy-metric surveys for the estimation of sea floor dynamics in a satisfactory way. Those dynamics may be present on the scale of the sea floor, it may be a local effect, or it may be due to a tidal sand wave pattern. Also, the results are successfully reduced to a set of four indicators, used to improve a resurvey policy. Based on these conclusions, we formulate recommendations on the extrapolation of the results in space and time, on potential adaptations to the designed procedure, and on implementation of the procedure.Note de contenu : Preface
1 Introduction
1.1 Nautical charting
1.2 Survey plan design
1.3 Detection of sea floor dynamics
1.4 Tidal sand waves
1.5 The uncertainty of depth measurements
1.6 Problem formulation
1.7 Research question and subquestions
1.8 Research strategy and outline
2 Bathymetric applications of Geostatistics
2.1 Introduction
2.2 Depth as a trend and its residuals
2.3 Covariance functions
2.4 Kriging
2.5 Conclusion
3 Estimating sea floor dynamics
3.1 Introduction
3.2 The method for the estimation of sea floor dynamics
3.3 Specification of a test scenario
3.4 Analysis results of a dynamic sea floor
3.5 Discussion
3.6 Conclusion
3.A Error characteristics
3.B Transformation of the sand wave parameters
3.C The application of statistical estimation and testing
4 The analysis of migrating tidal sand waves
4.1 Introduction
4.2 The application of deformation analysis
4.3 Results of the deformation analysis
4.4 Discussion of results
4.5 Conclusion
4.A Overview of used surveys
4.B Quantification of measurement errors
4.B.1 Covariance function of the error
4.B.2 Variances of the SEES surveys
4.B.3 Variances of the MBES survey
5 Spatial variations in sea floor dynamics
5.1 Introduction
5.2 Deformation analysis
5.3 The Selected Track region: little dynamics
5.4 The Noordhinder region: comparison with other methods
5.5 The region West of IJmuiden: sand wave migration
5.6 The region North of Terschelling: a flat sea floor
5.7 Discussion
5.8 Conclusion
5.A Overview of used surveys
6 Application to the resurvey policy
6.1 Introduction
6.2 Background: Hydrographic practice
6.3 Method: indicators of sea floor dynamicsNuméro de notice : 15495 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Thèse étrangère DOI : sans En ligne : https://www.ncgeo.nl/downloads/69Dorst.pdf Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=62737 Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 15495-01 32.10 Livre Centre de documentation Topographie Disponible Impact du système de référence terrestre sur la montée du niveau moyen des mers par marégraphie / Xavier Collilieux (2009)
Titre : Impact du système de référence terrestre sur la montée du niveau moyen des mers par marégraphie Type de document : Rapport Auteurs : Xavier Collilieux , Auteur ; Guy Wöppelmann
, Auteur
Editeur : Paris : Institut Géographique National - IGN (1940-2007) Année de publication : 2009 Collection : Publications du LAREG Sous-collection : Memorandum Importance : 21 p. Format : 21 x 30 cm Note générale : Bibliographie Langues : Français (fre) Descripteur : [Termes IGN] marégraphie
[Termes IGN] niveau moyen des mers
[Termes IGN] système de référence mondial
[Vedettes matières IGN] AltimétrieIndex. décimale : 30.52 Marégraphie et niveau moyen des mers Résumé : (Auteur) Après une introduction sur l'influence du repère terrestre sur la dérivation du niveau moyen des mers nous réalisons une analyse détaillée de l'influence du repère terrestre sur le niveau moyen des mers obtenu à l'aide de données marégraphiques et GPS. Une étude sur la recherche du repère de référence terrestre dans lequel la montée du niveau des mers est la plus uniforme nous a permis de conclure que l'ITRF2005 possédait une origine plus vraisemblable que l'ITRF2000 au vu de cette hypothèse. Numéro de notice : 15489 Affiliation des auteurs : IGN (1940-2011) Thématique : POSITIONNEMENT Nature : Rapport d'étude technique Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=40706 Exemplaires(2)
Code-barres Cote Support Localisation Section Disponibilité 15489-02 30.52 Livre Centre de documentation Géodésie Disponible 15489-01 30.52 Livre Centre de documentation Géodésie Disponible
Titre : Métadonnées de grilles au Service de géodésie et nivellement Type de document : Monographie Auteurs : Samuel Branchu, Auteur Editeur : Paris : Institut Géographique National - IGN (1940-2007) Année de publication : 2009 Collection : Publications techniques en géodésie Sous-collection : Notes techniques num. 28215 Importance : 11 p. Format : 21 x 30 cm Langues : Français (fre) Descripteur : [Vedettes matières IGN] Nivellement
[Termes IGN] CIRCE
[Termes IGN] coordonnées géographiques
[Termes IGN] grille
[Termes IGN] métadonnées
[Termes IGN] nivellement indirect
[Termes IGN] spécification de produitIndex. décimale : 30.50 Nivellement - généralités Résumé : (Auteur) Ce document décrit les métadonnées de grilles au Service de la Géodésie et du Nivellement. Numéro de notice : 15407 Affiliation des auteurs : IGN (1940-2011) Thématique : POSITIONNEMENT Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=37884 Exemplaires(3)
Code-barres Cote Support Localisation Section Disponibilité 15407-02 30.50 Livre Centre de documentation Géodésie Disponible 15407-01 30.50 Livre Centre de documentation Géodésie Disponible 15407-03 7D Livre SGM K001 Exclu du prêt Water vapour intercomparison effort in the frame of the Convective and Orographically‐ induced Precipitation Study / Rohini Bhawar (2009)
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Titre : Water vapour intercomparison effort in the frame of the Convective and Orographically‐ induced Precipitation Study Type de document : Article/Communication Auteurs : Rohini Bhawar, Auteur ; Paolo di Girolamo, Auteur ; Donato Summa, Auteur ; Cyrille Flamant, Auteur ; Dietrich Althausen, Auteur ; Andreas Behrendt, Auteur ; Alan Blyth, Auteur ; Olivier Bock , Auteur ; Pierre Bosser
, Auteur ; et al., Auteur
Editeur : AIP Publishing (American institute of physics) Année de publication : 2009 Collection : AIP conference proceedings Conférence : IRS 2008, International Radiation Symposium 03/08/2008 08/08/2008 Foz do Iguaçu Brésil Proceedings AIP Importance : pp 215 - 218 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] altitude
[Termes IGN] analyse comparative
[Termes IGN] erreur systématique
[Termes IGN] précipitation
[Termes IGN] vapeur d'eauRésumé : (auteur) The main objective of this work is to provide accurate error estimates for the different water vapour profiling sensors based on an intensive inter‐comparison effort. The inter‐comparison, performed in the framework of COPS—Convective and Orographically‐induced Precipitation Study (01 June–31 August 2007), involves airborne and ground‐based water vapour lidar systems, radiosondes with different humidity sensors, GPS and Microwave radiometers (MWR). Simultaneous and co‐located data from different sensors are used to compute relative bias and root‐mean square (RMS) deviations as a function of altitude. Numéro de notice : C2008-034 Affiliation des auteurs : LOEMI+Ext (1985-2011) Thématique : POSITIONNEMENT Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : 10.1063/1.3116952 Date de publication en ligne : 23/03/2009 En ligne : https://doi.org/10.1063/1.3116952 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102525 Tide gauge datum continuity at Brest since 1711: France's longest sea-level record / Guy Wöppelmann in Geophysical research letters, vol 35 n° 22 (28/11/2008)
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[article]
Titre : Tide gauge datum continuity at Brest since 1711: France's longest sea-level record Type de document : Article/Communication Auteurs : Guy Wöppelmann , Auteur ; Nicolas Pouvreau, Auteur ; Alain Coulomb
, Auteur ; Bernard Simon, Auteur ; Philip L. Woodworth, Auteur
Année de publication : 2008 Article en page(s) : 5 p. Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] Atlantique Ouest
[Termes IGN] Brest
[Termes IGN] dix-huitième siècle
[Termes IGN] dix-neuvième siècle
[Termes IGN] données marégraphiques
[Termes IGN] marégraphe
[Termes IGN] marégraphie
[Termes IGN] montée du niveau de la mer
[Termes IGN] niveau de la mer
[Termes IGN] série temporelle
[Termes IGN] vingtième siècle
[Vedettes matières IGN] AltimétrieRésumé : (Auteur) The issue of a possible tide gauge datum discontinuity at Brest, caused by the bombing of the city in August 1944, is discussed. This issue is very important, as many scientists have used this long record to derive a long-term sea level trend estimate for use within global sea level rise studies. A detailed analysis of historical leveling information, and comparison of sea level data between adjacent stations, proved to be worthwhile, even beyond this initial scope of the study: it led to an accurate datum connection between recently rediscovered 18th century sea level data (back to 1711) and those of the present day. The study provides additional evidence that the onset of recent rapid sea level rise most likely took place in the late 19th century, in agreement with the nearby Liverpool sea-level record and with independent results from sediment cores collected in salt marshes located in both hemispheres. Numéro de notice : A2008-675 Affiliation des auteurs : IGN+Ext (1940-2011) Thématique : POSITIONNEMENT Nature : Article DOI : 10.1029/2008GL035783 Date de publication en ligne : 26/11/2008 En ligne : https://doi.org/10.1029/2008GL035783 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33548
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