Journal of Environmental Protection, 2021, 12, 1234-1253 https://www.scirp.org/journal/jep ISSN Online: 2152-2219 ISSN Print: 2152-2197 DOI: 10.4236/jep.2021.1212073 Dec. 31, 2021 1234 Journal of Environmental Protection Hydrometeorology of Anthropogenic Erosion in the Metropolitan Region of São Paulo Maria del Carmen Sanz Lopez , Augusto José Pereira Filho , Jorge Luiz Diaz Pinaya Departamento de Ciências Atmosférica do Instituto de Astronomia, Geofísica e Ciências Atmosféricas da Universidade de São Paulo, São Paulo, Brazil Abstract Erosive processes play an important role in environmental degradation. Rain is the main erosive agent in the Metropolitan Region of Sao Paulo. This study characterized the erosion events caused by precipitation leveraging the ac- cumulated daily precipitation estimate generated by the Climate Prediction Center Morphing Method (CMORPH) and integrating the surface telemetric network using the Statistical Objective Analysis method (SOAS). From the Civil Defense database, 400 events were identified in the Metropolitan region of Sao Paulo (MRSP) area between 2000 and 2013 and, of these, 3 were cho- sen to carry out meteorological and climatological analyses. In an initial ob- servation, 58% of them were found to occur in summer. Two regions with the highest number of erosion events were observed, in the Serra do Mar and Serra da Cantareira. In the Serra do Mar core, the municipality of São Ber- nardo do Campo was the one with the greatest amount of erosion. Precipita- tion volumes were estimated for accumulations of 30 minutes, 1 day, 1 month, and 1 year. The results, from the 3 events, indicate accumulated precipitation in 30 minutes from 10 mm to 19.8 mm, daily from 30.8 mm to 69.5 mm, and 1 month from 369.7 mm to 742.5 mm, and 1 year (2010) from 1712.9 mm to 1961.8 mm. In these events, it was noted that there were heavy rains in De- cember 2009 and January 2010. It was also noted that the CMORPH and SOAS identify the rain events found by the São Paulo meteorological radar. The meteorological analyzes of the events based on images from the São Pau- lo meteorological radar and the Meteosat-9 satellite indicate that the active precipitation systems are associated with cold fronts, instability lines, and isolated convection. Keywords Hydrometeorology, Anthropogenic Erosion, CMORPH, SOAS How to cite this paper: Lopez, M.delC.S., Filho, A.J.P. and Pinaya, J.L.D. (2021) Hy- drometeorology of Anthropogenic Erosion in the Metropolitan Region of São Paulo. Journal of Environmental Protection, 12, 1234-1253. https://doi.org/10.4236/jep.2021.1212073 Received: December 4, 2021 Accepted: December 28, 2021 Published: December 31, 2021 Copyright © 2021 by author(s) and Scientific Research Publishing Inc. This work is licensed under the Creative Commons Attribution International License (CC BY 4.0). http://creativecommons.org/licenses/by/4.0/ Open Access