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Optimal lowest astronomical tide estimation using maximum likelihood estimator with multiple ocean models hybridization / Mohammed El-Diasty in ISPRS International journal of geo-information, vol 9 n° 5 (May 2020)
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Titre : Optimal lowest astronomical tide estimation using maximum likelihood estimator with multiple ocean models hybridization Type de document : Article/Communication Auteurs : Mohammed El-Diasty, Auteur Année de publication : 2020 Article en page(s) : 11 p. Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Océanographie
[Termes descripteurs IGN] carte marine
[Termes descripteurs IGN] données hydrographiques
[Termes descripteurs IGN] incertitude des données
[Termes descripteurs IGN] levé hydrographique
[Termes descripteurs IGN] marée océanique
[Termes descripteurs IGN] marégraphe
[Termes descripteurs IGN] méthode du maximum de vraisemblance (estimation)
[Termes descripteurs IGN] modèle océanographique
[Termes descripteurs IGN] navigation maritime
[Termes descripteurs IGN] niveau de la mer
[Termes descripteurs IGN] océanographie dynamique
[Termes descripteurs IGN] Rouge, merRésumé : (auteur) Developing an accurate Lowest Astronomical Tide (LAT) in a continuous form is essential for many maritime applications as it can be employed to develop an accurate continuous vertical control datum for hydrographic surveys applications and to produce accurate dynamic electronic navigation charts for safe maritime navigation by mariners. The LAT can be developed in a continuous (surface) using an estimated LAT surface model from the hydrodynamic ocean model along with coastal discrete LAT point values derived from tide gauges data sets to provide the corrected LAT surface model. In this paper, an accurate LAT surface model was developed for the Red Sea case study using a Maximum Likelihood Estimator (MLE) with multiple hydrodynamic ocean models hybridization, namely, WebTide, FES2014, DTU10, and EOT11a models. It was found that the developed optimal hybrid LAT model using MLE with multiple hydrodynamic ocean models hybridization ranges from 0.1 m to 1.63 m, associated with about 2.4 cm of uncertainty at a 95% confidence level in the Red Sea case study area. To validate the accuracy of the developed model, the comparison was made between the optimal hybrid LAT model developed from multiple hydrodynamic ocean models hybridization using the MLE method with the individual LAT models estimated from individual WebTide, FES2014, DTU10, or EOT11a ocean models based on the associated uncertainties estimated at a 95% confidence level. It was found that the optimal hybrid LAT model accuracy is superior to the individual LAT models estimated from individual ocean models with an improvement of about 50% in average, based on the estimated uncertainties. The importance of developing optimal LAT surface model using the MLE method with multiple hydrodynamic ocean models hybridization in this paper with few centimeters level of uncertainty can lead to accurate continuous vertical datum estimation that is essential for many maritime applications. Numéro de notice : A2020-301 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.3390/ijgi9050327 date de publication en ligne : 17/05/2020 En ligne : https://doi.org/10.3390/ijgi9050327 Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=95141
in ISPRS International journal of geo-information > vol 9 n° 5 (May 2020) . - 11 p.[article]Recent sea level change in the black sea from satellite altimetry and tide gauge observations / Nevin Betül Avsar in ISPRS International journal of geo-information, vol 9 n° 3 (March 2020)
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Titre : Recent sea level change in the black sea from satellite altimetry and tide gauge observations Type de document : Article/Communication Auteurs : Nevin Betül Avsar, Auteur ; H.S. Kutoglu, Auteur Année de publication : 2020 Article en page(s) : 18 p. Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes descripteurs IGN] altimétrie
[Termes descripteurs IGN] changement du niveau de la mer
[Termes descripteurs IGN] déformation verticale de la croute terrestre
[Termes descripteurs IGN] données GNSS
[Termes descripteurs IGN] données satellitaires
[Termes descripteurs IGN] données topographiques
[Termes descripteurs IGN] érosion côtière
[Termes descripteurs IGN] marégraphe
[Termes descripteurs IGN] Noire, mer
[Termes descripteurs IGN] série temporelle
[Termes descripteurs IGN] surcharge hydrologique
[Termes descripteurs IGN] variation saisonnièreRésumé : (auteur) Global mean sea level has been rising at an increasing rate, especially since the early 19th century in response to ocean thermal expansion and ice sheet melting. The possible consequences of sea level rise pose a significant threat to coastal cities, inhabitants, infrastructure, wetlands, ecosystems, and beaches. Sea level changes are not geographically uniform. This study focuses on present-day sea level changes in the Black Sea using satellite altimetry and tide gauge data. The multi-mission gridded satellite altimetry data from January 1993 to May 2017 indicated a mean rate of sea level rise of 2.5 ± 0.5 mm/year over the entire Black Sea. However, when considering the dominant cycles of the Black Sea level time series, an apparent (significant) variation was seen until 2014, and the rise in the mean sea level has been estimated at about 3.2 ± 0.6 mm/year. Coastal sea level, which was assessed using the available data from 12 tide gauge stations, has generally risen (except for the Bourgas Station). For instance, from the western coast to the southern coast of the Black Sea, in Constantza, Sevastopol, Tuapse, Batumi, Trabzon, Amasra, Sile, and Igneada, the relative rise was 3.02, 1.56, 2.92, 3.52, 2.33, 3.43, 5.03, and 6.94 mm/year, respectively, for varying periods over 1922–2014. The highest and lowest rises in the mean level of the Black Sea were in Poti (7.01 mm/year) and in Varna (1.53 mm/year), respectively. Measurements from six Global Navigation Satellite System (GNSS) stations, which are very close to the tide gauges, also suggest that there were significant vertical land movements at some tide gauge locations. This study confirmed that according to the obtained average annual phase value of sea level observations, seasonal sea level variations in the Black Sea reach their maximum annual amplitude in May–June. Numéro de notice : A2020-254 Affiliation des auteurs : non IGN Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.3390/ijgi9030185 date de publication en ligne : 20/03/2020 En ligne : https://doi.org/10.3390/ijgi9030185 Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=95008
in ISPRS International journal of geo-information > vol 9 n° 3 (March 2020) . - 18 p.[article]A comparative study between least square and total least square methods for time-series analysis and quality control of sea level observations / Mahmoud Pirooznia in Marine geodesy, vol 42 n° 2 (March 2019)
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Titre : A comparative study between least square and total least square methods for time-series analysis and quality control of sea level observations Type de document : Article/Communication Auteurs : Mahmoud Pirooznia, Auteur ; Mehdi Raoofian Naeeni, Auteur ; Yazdan Amerian, Auteur Année de publication : 2019 Article en page(s) : pp 104 - 129 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes descripteurs IGN] analyse de variance
[Termes descripteurs IGN] contrôle qualité
[Termes descripteurs IGN] données marégraphiques
[Termes descripteurs IGN] filtrage du bruit
[Termes descripteurs IGN] marégraphe
[Termes descripteurs IGN] méthode des moindres carrés
[Termes descripteurs IGN] niveau de la mer
[Termes descripteurs IGN] série temporelle
[Termes descripteurs IGN] valeur aberranteRésumé : (Auteur) In this study, the quality control of tide gauge observations is investigated by two methods of least square (LS-HE) and total least square harmonic estimation (TLS-HE). Particularly, it is shown how to deal with unexpected anomalies, including outliers, offset and gap in the time series of sea level height. To do so, at first the time series is constructed and then a method based on variance threshold is used to eliminate the possible outliers in the observations. Subsequently, a noise assessment algorithm is implemented and the signal is processed to find the possible times of offsets and to eliminate their corresponding observations from the time series. Finally, the signal is checked to find the periods of gap within the time series and then the gap area is predicted with correct observations. Gap filling analysis is performed in two contexts. In the first, only the significant frequencies of tide are considered in the modelling procedure, while in the second, all possible frequencies according to the period of observations are included. Our results show that for modelling and gap filling, the TLS-HE method has a better performance in a comparison with LS-HE method. Although, for offset and outlier detections, the LS-HE is recommended. It also indicates that the TLS-HE method provides a regular solution for gap filling analysis while LS-HE method needs a regularization scheme for which LSQR regularization is used. Numéro de notice : A2019-176 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/01490419.2018.1553806 date de publication en ligne : 24/01/2019 En ligne : https://doi.org/10.1080/01490419.2018.1553806 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=92644
in Marine geodesy > vol 42 n° 2 (March 2019) . - pp 104 - 129[article]The effect of regional sea level atmospheric pressure on sea level variations at globally distributed tide gauge stations with long records / Huseyin Baki Iz in Journal of geodetic science, vol 8 n° 1 (January 2018)
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Titre : The effect of regional sea level atmospheric pressure on sea level variations at globally distributed tide gauge stations with long records Type de document : Article/Communication Auteurs : Huseyin Baki Iz, Auteur Année de publication : 2018 Article en page(s) : pp 55 - 71 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes descripteurs IGN] changement climatique
[Termes descripteurs IGN] changement du niveau de la mer
[Termes descripteurs IGN] données marégraphiques
[Termes descripteurs IGN] marégraphe
[Termes descripteurs IGN] niveau de la mer
[Termes descripteurs IGN] pression atmosphérique
[Termes descripteurs IGN] série temporelleRésumé : (Auteur) This study provides additional information about the impact of atmospheric pressure on sea level variations. The observed regularity in sea level atmospheric pressure depends mainly on the latitude and verified to be dominantly random closer to the equator. It was demonstrated that almost all the annual and semiannual sea level variations at 27 globally distributed tide gauge stations can be attributed to the regional/local atmospheric forcing as an inverted barometric effect. Statistically significant non-linearities were detected in the regional atmospheric pressure series, which in turn impacted other sea level variations as compounders in tandem with the lunar nodal forcing, generating lunar sub-harmonics with multidecadal periods. It was shown that random component of regional atmospheric pressure tends to cluster at monthly intervals. The clusters are likely to be caused by the intraannual seasonal atmospheric temperature changes,which may also act as random beats in generating sub-harmonics observed in sea level changes as another mechanism. This study also affirmed that there are no statistically significant secular trends in the progression of regional atmospheric pressures, hence there was no contribution to the sea level trends during the 20th century by the atmospheric pressure.Meanwhile, the estimated nonuniform scale factors of the inverted barometer effects suggest that the sea level atmospheric pressure will bias the sea level trends inferred from satellite altimetry measurements if their impact is accounted for as corrections without proper scaling. Numéro de notice : A2018-615 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1515/jogs-2018-0007 date de publication en ligne : 30/05/2018 En ligne : https://doi.org/10.1515/jogs-2018-0007 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=92663
in Journal of geodetic science > vol 8 n° 1 (January 2018) . - pp 55 - 71[article]
[article]
Titre : Opération marégraphes : appui scientifique Type de document : Article/Communication Auteurs : Anonyme, Auteur Année de publication : 2017 Article en page(s) : pp 20 - 23 Langues : Français (fre) Descripteur : [Vedettes matières IGN] Nivellement
[Termes descripteurs IGN] campagne d'observations
[Termes descripteurs IGN] données GNSS
[Termes descripteurs IGN] marégraphe
[Termes descripteurs IGN] niveau de la mer
[Termes descripteurs IGN] SONEL
[Termes descripteurs IGN] surveillance du littoralRésumé : (Auteur) Soixante-dix géomètres-experts mobilisés en mai 2016, quarante-cing marégraphes auscultés sur le littoral français ... L'OGE apporte désormais sa pierre à l'édifice scientifique constitué de l'IGN, du SHOM et du Sonel pour la surveillance du niveau des mers. Numéro de notice : A2017-650 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=87021
in Géomètre > n° 2151 (octobre 2017) . - pp 20 - 23[article]Réservation
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PermalinkLe paradoxe de l'élévation du niveau des mers au XXème siècle / Guy Wöppelmann in XYZ, n° 143 (juin - août 2015)
PermalinkLevelling co-located GNSS and tide gauge stations using GNSS reflectometry / Alvaro Santamaria Gomez in Journal of geodesy, vol 89 n° 3 (March 2015)
PermalinkPermalinkLa mesure du niveau de la mer par bouées GPS : l'expérience multi-capteurs de l'île d'Aix / Gaël André in XYZ, n° 140 (septembre - novembre 2014)
PermalinkRescue of the historical sea level record of Marseille (France) from 1885 to 1988 and its extension back to 1849–1851 / Guy Wöppelmann in Journal of geodesy, vol 88 n° 9 (September 2014)
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