MÉTODOS CARTOGRÁFICOS DE SCRIPT DE GMT PARA MAPEAR AS TRINCHEIRAS DA NOVA GRÃ-BRETANHA E SAN CRISTOBAL, MAR DE SALOMÃO, PAPUA-NOVA GUINÉ

  • Polina Lemenkova Schmidt Institute of Physics of the Earth of the Russian Academy of Sciences. Department of Natural Disasters, Anthropogenic Hazards and Seismicity of the Earth. Laboratory of Regional Geophysics and Natural Disasters

Resumo

The study present a case study of the Generic Mapping Tools (GMT) applied for cartographic modelling, mapping and comparative analysis of the deep-sea trenches located in southwest Pacific Ocean: the New Britain Trench (NBT) and the San Cristobal Trench (SCT). The aim was to evaluate their geomorphic variation using scripting cartographic approach of GMT. The data was processed using a sequence of the GMT modules with the main module 'grdtrack' used to visualize cross-section profiles along the trenches for their geomorphological modelling. The main grid used for topographic mapping is the SRTM DEM with 15-arc second resolution. The statistical analysis shown variability in depths of both trenches by samples in two transects. The cartographic analysis demonstrated following results. The SCT is generally deeper reaching -9,000 m, while the median for the NBT less then 7,000 m. The gradient slope of SCT is more symmetric with accurate 'V' form. In a cross-section graph, the NBT landward slope is markedly asymmetric U-shaped form and has a crescent form in the east. The NBT slope dips westwards with 35° eastward, and 41° westward, while the SCT slope has 33° oceanwards and 33,69° landwards. The difference between the geomorphology of the trenches is explained by the effects of the geotectonic evolution and actual sedimentary processes affected their formation and sculptured their structure. The marine free-air gravity anomaly illustrated density anomalies at the bathymetry in the region of NBT and SCT with range <-60.0 mGal. The geoid values are 56-66 mGal. The study contributed to the submarine geomorphic mapping and presents technical application of the cartographic functionality of GMT used for geomorphological modelling.

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Biografia do Autor

Polina Lemenkova, Schmidt Institute of Physics of the Earth of the Russian Academy of Sciences. Department of Natural Disasters, Anthropogenic Hazards and Seismicity of the Earth. Laboratory of Regional Geophysics and Natural Disasters

MSc degree (2011) in GIS and Earth Observation jointly awarded from the University of Southampton (UK), University of Twente (Netherlands), University of Warsaw (Poland) and Lund University (Sweden) with fieldwork on Crete Island (Greece). MSc Thesis: ‘Seagrass mapping and monitoring along the coasts of Crete, Greece’. Multiple research stays at European universities. Additional studies at: University of Vienna (Austria), University of Lapland (Finland), Eötvös Loránd University (Hungary), University of Tartu (Estonia), Matej Bel University (Slovakia), Université Libre de Bruxelles (Belgium), NTU (China), Ege University (Turkey), TU Dresden (Germany), Charles University in Prague (Czech Republic), Ocean University of China. Attendee of numerous events. BSc degree in Geography and Cartography: Lomonosov Moscow State University, 2004 (Summa Cum Laude). University Gold Medal for the Academic Excellence. BSc Thesis: 'Ecological Mapping of the Barents and the Pechora Seas'; Term Paper: 'Ecological and Geographical Mapping of the Baltic Sea Region in the Gulf of Finland'. Participation in the ANT/XXIII-4 Antarctic expedition by AWI, Germany: South Pacific Ocean, Amundsen Sea, Bellingshausen Sea, Pine Island Bay.

Publicado
2020-12-30
Como Citar
LEMENKOVA, P. MÉTODOS CARTOGRÁFICOS DE SCRIPT DE GMT PARA MAPEAR AS TRINCHEIRAS DA NOVA GRÃ-BRETANHA E SAN CRISTOBAL, MAR DE SALOMÃO, PAPUA-NOVA GUINÉ. Revista da Casa da Geografia de Sobral (RCGS), v. 22, n. 3, p. 122-142, 30 dez. 2020.
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Artigos