GMT Based Comparative Geomorphological Analysis of the Vityaz and Vanuatu Trenches, Fiji Basin
Lemenkova Polina. 2020-05-05. .
ARTICLE, (2020-05-05 ) - PUBLISHEDVERSION - English (en-GB)
OPENACCESS -
http://creativecommons.org/licenses/by/, info:eu-repo/semantics/OpenAccess.
Audience : OTHER
HAL CCSD, Croatian Geodetic Society
Sujet
cartography, GMT, Pacific Ocean, Fiji, Vityaz Trench, Vanuatu Trench, ACM: I.: Computing Methodologies, ACM: I.: Computing Methodologies/I.3: COMPUTER GRAPHICS, ACM: I.: Computing Methodologies/I.3: COMPUTER GRAPHICS/I.3.7: Three-Dimensional Graphics and Realism, ACM: I.: Computing Methodologies/I.4: IMAGE PROCESSING AND COMPUTER VISION, ACM: I.: Computing Methodologies/I.5: PATTERN RECOGNITION, ACM: I.: Computing Methodologies/I.6: SIMULATION AND MODELING, ACM: I.: Computing Methodologies/I.6: SIMULATION AND MODELING/I.6.5: Model Development, ACM: I.: Computing Methodologies/I.5: PATTERN RECOGNITION/I.5.1: Models, ACM: I.: Computing Methodologies/I.5: PATTERN RECOGNITION/I.5.4: Applications, ACM: I.: Computing Methodologies/I.3: COMPUTER GRAPHICS/I.3.2: Graphics Systems, ACM: I.: Computing Methodologies/I.3: COMPUTER GRAPHICS/I.3.6: Methodology and Techniques, [INFO]Computer Science [cs], [INFO.INFO-HC]Computer Science [cs]/Human-Computer Interaction [cs.HC], [SDU]Sciences of the Universe [physics], [SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, [SDU.STU]Sciences of the Universe [physics]/Earth Sciences, [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology, [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph], [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics, [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography, [INFO.INFO-CV]Computer Science [cs]/Computer Vision and Pattern Recognition [cs.CV], [INFO.INFO-IT]Computer Science [cs]/Information Theory [cs.IT], [INFO.INFO-IR]Computer Science [cs]/Information Retrieval [cs.IR], [INFO.INFO-IA]Computer Science [cs]/Computer Aided Engineering, [INFO.INFO-MO]Computer Science [cs]/Modeling and Simulation, [INFO.INFO-GR]Computer Science [cs]/Graphics [cs.GR], [INFO.INFO-PL]Computer Science [cs]/Programming Languages [cs.PL], [INFO.INFO-TI]Computer Science [cs]/Image Processing [eess.IV]
Domaines
Géographie, Géologie, Sciences de la Terre, Informatique, Télédétection, Géophysique
Description
International audience The study is geographically focused on the two deep-sea trenches: Vanu-atu and Vityaz, Fiji Basin, East Australia, located in the area of the double conver-gent complex boundary of Pacific and Indo-Australian plates in the North Fiji back-arc basin. Complex geophysical settings results in the formation of the trenches, seismicity, geodynamic complexity and instability of the region. The work aimed at modelling and comparative statistical analysis of the bathymetry and geomorphology of two trenches. Technically, the methodology of this work is based on the Generic Mapping Tools (GMT) using cartographic mapping of the geophysical, tectonic and geological settings, 2D and 3D modelling, visualizing raster grids GEBCO, ETOPO1, ETOPO5. Histogram topographic equalization (equalized, normalized, quadratic) was done using module 'grdhisteq'. Modelling geoid and gravity was based on EGM96 by sequence of GMT modules. The cross-spectrals of 2D binary raster grids were compared and their coherency plotted by 'grdfft'. The automated cross-sectioning was done using 'grdtrack' module. The results include modelled transects visualizing trenches asymmetry, bathymetric and geomorphic variations. Vityaz Trench is shallower with depths <-6,100 m, has 'bell-shape' data distribution with two peaks at ranges-3,500 m to-3,700 m, and-4,800 m to-5,000 m. Vanuatu Trench reaches up to-7,000 m with majority of values between-5,000 m to-3,000 m, even data distribution with depth increasing at-2,200 m to-800 m. Geomorphic form of both trenches varies: Vityaz has flat wide bottom similar to a trough, steeper gradient eastern slope. Vanuatu has V-form classic shape with gentle shapes on both slopes. Selected segment of Vityaz has shallower depths with maximal <-5,000 m while Vanuatu is deeper (-6,000 m). Cartographic functionality of the GMT is presented by various cartographic projections: Mercator, Behrman, Cylindrical Stereographic, Hammer retroazimuthal. 3D modelling was done using GMT module 'grdview'. Trenches were visualized and rotated at 160°/45°azimuth. Presented maps, 2D and 3D models and graphics are plotted and visualized by GMT with selected code snippets explained. Current work contributes to the methods of the modelling of deep-sea trenches geomorphology.
Auteurs
Lemenkova, Polina
Contributeurs
Ocean University of China (OUC), China Scholarship Council, State Oceanic Administration, Marine Scholarship of China, Grant Nr. 2016SOA002, China.
Sources
ISSN: 0016-710X, Geodetski List, Geodetski List, Croatian Geodetic Society, 2020, 74(97) (1), pp.19 - 39. ⟨10.6084/m9.figshare.12249773⟩, https://hrcak.srce.hr/geodetski-list
