QUANTITATIVE GEOMORPHOLOGY APPLIED TO FLUVIAL DYNAMIC IN AVILES AND MONETA BASINS, TIERRA DEL FUEGO, SOUTHERN ARGENTINA

QUIROGA, DIEGO; VERÓNICA GIL; ANDREA CORONATO

Environmental Earth Sciences

Springer Verlag

Lugar: Berlin-Heidelberg; Año: 2017

The morphometric characteristics of the river basin Moneta is compared to Aviles river basin after being analyzed. Both are located in the north of the province of Tierra del Fuego in Argentina and also have their catchment area in the same range: The Sierras del Bosque; Runoff on the NE oriented slopes form the Avilés basin, while runoff on the SE slopes form the Moneta basin. The analysis was made in two different scales: first a general scale of the basin and the second as the catchment (upper, medium and low) sector. The quantitative analysis was applied in order to know, at first an indirect method, the behavior of these two fluvial systems. It was used a cartographic basis scale to 1: 20,000, made on a mosaic of images from Google Earth ®, and the altimetric information is obtained throughout a digital elevation model of 45 m spatial resolution SRTM45 (Shuttle Radar Topographic Mission). The indices used were Rr, Rb, Ish and Dd to characterize the geological and geomorphological context and 24 Rl, Re, If, Ct and Ca that allow us to infer the behavior of the runoff in the catchment. It was established that the Moneta basin reaches 6 in order of hierarchy; its main channel is 65.52 km long. On the obtained results, based on the Re, determined that an elongate ?shapes. The Ct obtained in the basin is 0.96, whereas the sub-basin level was identified to a maximum value of the O3-SCM-10 (1.46).The Dd is low (1.94 km/km2) which it is directly proportional to the intensity of rainfall and the slopes of the area considered. By the basin sectors´ comparison, it is possible to understand the river dynamics in the same scale of analysis for both cases, determining specific characteristics of each sector.