EFFECT OF OROGRAPHY ON RAINS THROUGH THE ANALYSIS OF CLIMATE INDEXES IN THE WESTERN PLATEAU REGION OF PAULISTA

Authors

DOI:

https://doi.org/10.4215/rm2023.e22030

Abstract

The present research analyzed the effect of relief on the variability and extremes of rainfall in the central portion of the state of São Paulo, using 31 surface rainfall gauges. For this, it applied the methods of filling gaps (Regional Weighting), rainfall classification (Rain Anomaly Indexes) and precipitation indexes (Rclimdex). Through the methods used, it was verified that the pluviometric variability showed in the admitted parameters of normality with about 17% of the years, in the wet parameters about 18% of the years and in the dry parameters about 15% of the years of the historical series of 1979 -2017. In addition, it was found that among the thirty-eight years of the historical series, the year 1983 was the wettest and the year 2014 the driest. As these were two distinct representative years (wet and dry) of rainfall, it was noted through the rainfall indexes, they showed the strength of the orographic effect in the intensification of rainfall in volume and number of extreme days in the higher regions located in the southern portion of the study area. Therefore, due to the altitude that manifests itself associated with a sharp altimetric difference that establishes a high slope, which the central region of the state of São Paulo has, its morphological characteristics play an important role with the process of intensification of the rains, mainly in the years rainy.


Keywords: Precipitation; Rainfall anomaly index; Extreme years; RClimdex; Relief.

Author Biographies

  • Bruno César dos Santos, University of São Paulo, São Carlos (SP) Brazil

    PhD student in Sciences at the São Carlos School of Engineering, University of São Paulo (EESC/USP) – Environmental Engineering concentration area – Climatology Center applied to the Environment. Master of Science – Environmental Engineering concentration area from the São Carlos School of Engineering, University of São Paulo (EESC, 2016). Graduated in Geography from the Federal University of Alfenas (UNIFAL-MG, 2013). Conducts research in the areas of Climatology Applied to the Environment, Agrometeorology, Geotechnology and Education. He has teaching experience in the area of Geography education.

  • Rafael Grecco Sanches, University of São Paulo, São Carlos (SP) Brazil

    PhD in Environmental Engineering Sciences from the São Carlos Engineering School (EESC) of the University of São Paulo (USP) in the area of Applied Climatology and postgraduate degree in specialization level in environmental management from Unesp, Bauru/SP. He interned in 2009 at the Riparian Forest Recovery Project in the State of São Paulo, a demonstration project in the city of Jaú/SP.

  • Gustavo Zen de Figueiredo Neves, State University of Goiás, Goiânia (GO), Brazil

    PhD in Sciences from USP (2018), whose research focused on the performance of atmospheric systems and rainfall distribution in the State of Goiás and the Federal District. He is an accredited Professor in the Postgraduate Program in Environmental Engineering Sciences at the University of São Paulo, offering two subjects: [SEA5916] Introduction to the Dynamic Study of Climate Generalities and Specificities and [SEA5862] Climatology Applied to the Environment; Advisor for academic master's degrees in the research line Climatology Applied to the Environment (USP São Carlos). Collaborating professor at the State University of Goiás, Campus Iporá, carrying out teaching and research activities in Geography. He is a member of the Brazilian Climatology Association (ABClima) serving as Director-Secretary (2018-2020 Management) and member of the Deliberative Council (2016-2018 and 2014-2016 Management). Collaborating researcher at the Locality Studies Group (USP Ribeirão Preto). He has teaching and professional experience in the area of Geosciences, working mainly on the topics of Physical Geography, Climatology, South American atmospheric systems, Urban Climate, among others. Reviewer for national and international scientific journals.

  • Paulo Henrique de Souza, Federal University of Alfenas, Alfenas (MG), Brazil

    PhD in Environmental Engineering Sciences from the University of São Paulo (2005) and post-doctorate in Geography from the Universidade Estadual Paulista Júlio de Mesquita Filho (2010). He currently does research and teaching at the Federal University of Alfenas UNIFAL-MG. He has experience in the area of Geosciences, working mainly on the following topics: planning, space, anthropogenic activities, education, climatology and biogeography.

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Published

2023-12-02

Issue

Vol. 22 (2023)

Section

Artigos

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