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Multi-model validation of currents in the Chesapeake Bay region in June 2010 / P. Chu in Marine geodesy, vol 35 n° 4 (October - December 2012)  

Public [article]  inMarine geodesy > vol 35 n° 4 (October - December 2012) . - pp 399 - 428 Titre : Multi-model validation of currents in the Chesapeake Bay region in June 2010 Type de document : Article/Communication Auteurs : P. Chu, Auteur ; G. Jacobs, Auteur ; K. Cambazoglu, Auteur ; R. Linzell, Auteur Année de publication : 2012 Article en page(s) : pp 399 - 428 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bathymétrie [Termes IGN] bathymétrie acoustique [Termes IGN] Chesapeake (baie de) [Termes IGN] courant marin [Termes IGN] Etats-Unis [Termes IGN] image NOAA [Termes IGN] littoral [Termes IGN] marégraphe [Termes IGN] modèle hydrographique [Termes IGN] niveau de l'eau [Termes IGN] niveau moyen des mers Résumé : (Auteur) In this paper, we discuss the validation of water level and current predictions from three coastal hydrodynamic models and document the resource and operational requirements for each modeling system. The ADvanced CIRCulation Model (ADCIRC), the Navy Coastal Ocean Model (NCOM), and Delft3D have been configured and validated for the Chesapeake Bay region during a Navy exercise. Water level predictions are compared with a NOAA/NOS water level gauge at the Chesapeake Bay Bridge Tunnel location while current predictions are validated with Acoustic Doppler Profiler (ADP) measurement records at three locations in the lower Chesapeake Bay. Statistical metrics such as correlation coefficient and root mean square error (RMSE) are computed. Both the vertically-integrated currents and currents at varying water depths are compared as well. The model-data comparisons for surface elevation indicate all three models agreed well with water level gauge data. The two-dimensional version of ADCIRC, ADCIRC2D, and NCOM yield better statistics, in terms of correlation and RMSE, than Delft3D. For vertically-integrated currents, ADCIRC2D has the smallest RMSE at Thimble Shoal and Naval Station locations while NCOM has the smallest RMSE at Cape Henry. For the horizontal currents over the water column, the fully three-dimensional, baroclinic ADCIRC model, ADCIRC3D, and NCOM both showed better agreement with the ADP measurements. Numéro de notice : A2012-668 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1080/01490419.2012.709477 Date de publication en ligne : 04/12/2012 En ligne : https://doi.org/10.1080/01490419.2012.709477 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32114 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
230-2012041	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Comparison of automated watershed delineations: effects on land cover areas, percentages, and relationships to nutrient discharges / M.E. Baker in Photogrammetric Engineering & Remote Sensing, PERS, vol 72 n° 2 (February 2006)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 72 n° 2 (February 2006) . - pp 159 - 168 Titre : Comparison of automated watershed delineations: effects on land cover areas, percentages, and relationships to nutrient discharges Type de document : Article/Communication Auteurs : M.E. Baker, Auteur ; D.E. Weller, Auteur ; T.E. Jordan, Auteur Année de publication : 2006 Article en page(s) : pp 159 - 168 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes IGN] analyse comparative [Termes IGN] automatisation [Termes IGN] bassin hydrographique [Termes IGN] Chesapeake (baie de) [Termes IGN] détection de contours [Termes IGN] modèle numérique de surface [Termes IGN] nitrate [Termes IGN] occupation du sol [Termes IGN] parcelle agricole [Termes IGN] sédiment Résumé : (Auteur) We compared manual delineations with those derived from ten automated delineations of 420 watersheds in four physiographic provinces of the Chesapeake Basin. Automated methods included commercial DEM-based routines and different parameterizations of four enhanced methods: stream burning, normalized excavation, surface reconditioning, and normalized reconditioning. Un-enhanced methods resulted in individual watershed boundaries with some gross discrepancies in watershed size relative to manual delineations (error rate of 0.22 > 25 percent difference compared to manual) and significantly different watershed size distributions (Mann-Whitney U p = 0.012). Integrating mapped streams through enhanced methods substantially improved correspondence with manual watersheds (error rates of only 0.08-0.02 > 25 percent difference). Analysis of cropland area among methods showed a significant difference between manual estimates and un-enhanced estimates (p = 0.049) that was corrected using enhanced algorithms. Subsequent analysis of percent cropland revealed that measurements of land cover proportions were not always affected by delineation errors. However, differences were large enough to influence regressions with stream nitrate-N at the 90 percent confidence level within one physiographic province. Enhanced delineations produced statistical relationships between percent cropland and nitrate-N concentrations consistent with manual delineations. The results provide support for enhanced automated watershed delineation within the Chesapeake Basin and suggest that normalized excavation can be an effective augmentation of existing stream burning and reconditioning procedures. Numéro de notice : A2006-038 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.72.2.159 En ligne : https://doi.org/10.14358/PERS.72.2.159 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27765 [article]

Remote sensing of the Chesapeake bay, Conference on remote sensing / National Aeronautics and Space Administration NASA (1972)

Public Titre : Remote sensing of the Chesapeake bay, Conference on remote sensing Type de document : Actes de congrès Auteurs : National Aeronautics and Space Administration NASA, Auteur Congrès : Congrès: NASA 1971, Conference on remote sensing Remote sensing of the Chesapeake bay (5 - 7 avril 1971; Wallops Flight Facility, Virginie - Etats-Unis), Auteur Editeur : Washington : National Aeronautics and Space Administration NASA Année de publication : 1972 Importance : 179 p. Format : 20 x 26 cm Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] baie [Termes IGN] Chesapeake (baie de) [Termes IGN] environnement [Termes IGN] Etats-Unis [Termes IGN] pollution des mers Index. décimale : CG1971 Actes de congrès en 1971 Numéro de notice : 48677 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Actes Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=35409

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
48677-01	CG.71	Livre	Centre de documentation	En réserve M-103	Disponible