ANÁLISE DE PARÂMETROS LINEARES DA MORFOLOGIA DAS DUNAS DA CRATERA HERSCHEL MARTE ATRAVÉS DAS IMAGENS HIRISE.

This paper performs an analysis of aeolian activity on Herschel crater on Mars from two dune fields in different topographical settings. At East field, between small simple craters, and at West the dune field is located inside a large impact crater, near to uplifted central peak. As source of data will be employed high resolution images (spatial resolution 0.25 m/pixel) and digital terrain models (DTM), with 1m / pixel spatial resolution, generated by HiRISE sensor of orbital probe Mars Reconnaissance Orbiter (MRO). Were measured horizontal parameters (Area, Azimuth length, width, and length/width ratio) and vertical parameters (height of crest (HC), height of slipface (HS), slipface slope, curvature) of 10 dunes in each field. In Field Herschel East, it is characterized by the unimodal wind regime. They have fat and free barchans on the uphill. The evolution is for axial barchanoids, with the presence of transverse dunes. It consists of a megabarchan interrupted by an impact crater 947m in diameter. The wind shadow generated by the main impact crater stands out as a phenomenon. The dunes have little azimuth variation. Ripple marks occur in the interdune region influenced by night wind and topography. Similar conditions were identified in similar terrestrial environments such as White Sands (New Mexico), Wolfe Creek (Australia) and Lagoa da Conceição (Santa Catarina). In Herschel Field West Acute Bimodal. They present normal and thin sloping downhill dunes, some anchored in Yardangs, with lots of azimuth variation. As a terrestrial analogue, we have the Liwa Oasis (United Arab Emirates / Saudi Arabia). [ABSTRACT FROM AUTHOR]