Spatization of floods on the Jacuí River by NDWI and Reclass at El Niño episodes

Authors

  • Pedro Teixeira Valente Universidade Federal do Rio Grande do Sul
  • Francisco Eliseu Aquino Universidade Federal do Rio Grande do Sul
  • Venisse Schossler Universidade Federal do Rio Grande do Sul

DOI:

https://doi.org/10.11606/rdg.v0ispe.132733

Keywords:

Wetlands, Remote Sensing, Extreme Precipitation Events, Teleconnections.

Abstract

This work aims spatialise the flood areas of the Jacuí river mouth during the occurence of two extreme precipitation events, in two El Niño episodes: september 1987 and september 2009 using two target delimitation techniques in IDRISI 17 SELVA: NDWI and Reclass. After that, the results were adjusted in ArcGis 10.2 layout. It was found that the floods are not directly related to El Niño events and that despite this phenomenon influence the precipitation of Rio Grande do Sul (Brazil), local factors such as topography and the actual precipitation system provides these anomalies. Finally, it was made a comparison of the two events, where it is perceived that the flood 2009 covers a larger area (435 km²) than the flood of 1987 (368 Km²). The probable reason for this increase in the flooded area is due to the increase in the used area for agriculture, which removes the wetlands, removing the barrier that contains the river.

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Published

2017-06-27

Issue

Section

Artigos

How to Cite

Valente, P. T., Aquino, F. E., & Schossler, V. (2017). Spatization of floods on the Jacuí River by NDWI and Reclass at El Niño episodes. Revista Do Departamento De Geografia, spe, 11-19. https://doi.org/10.11606/rdg.v0ispe.132733