Análise de curva de correlação entre pluviosidade e movimentos de massa nas encostas de João Pessoa (PB)

Abstract

The gravitational movements of mass are phenomena that occur in several cities of Brazil. Brazil and the world, causing several losses and victims. In João Pessoa (PB), the number of mass gravitational movements are phenomena that occur in several cities of the Brazil and the world, causing several losses and victims. In João Pessoa (PB), the number of accidents occurring in the urban area is worrying, which is due to the geological characteristics and geomorphology of the region, to the process of disordered occupation of the soil and precipitation, since most of these events occur in the rainy season. By having Since rainfall is one of the main triggers of landslides, this This study aimed to carry out an extension of the studies carried out by SOARES & RAMOS FILHO (2014), in order to verify the credibility of the dispersion curve developed by them to represent the relationship between rainfall and mass movements in the city of João Pessoa. The time interval analyzed in the current survey was from January 2014 to April 2018, with 31 events related to rain, distributed in 18 different dates. As a result, observed that for a threshold of up to 100 mm of cumulative 7-day rainfall, the new cases were quite dispersed and below the curve. Above 100 mm precipitation, there was a greater proximity of the points to the tendency, registering events that obeyed the correlation established by the authors, the that this curve could have been used in the Municipal Coordination of Protection and Civil Defense of João Pessoa (COMPDEC-JP). At end of the study, a new numerical relationship was established between accumulated precipitation (PA) of and daily precipitation (PD), encompassing all data recorded from 2008: = 0.0021 ( ) 2 - 0.9231 ( ) 133.79 accidents occurring in the urban area is worrying, which is due to the geological characteristics and geomorphology of the region, to the process of disordered occupation of the soil and precipitation, since most of these events occur in the rainy season. By having Since rainfall is one of the main triggers of landslides, this This study aimed to carry out an extension of the studies carried out by SOARES & RAMOS FILHO (2014), in order to verify the credibility of the dispersion curve developed by them to represent the relationship between rainfall and mass movements in the city of João Pessoa. The time interval analyzed in the current survey was from January 2014 to April 2018, with 31 events related to rain, distributed in 18 different dates. As a result, observed that for a threshold of up to 100 mm of cumulative 7-day rainfall, the new cases were quite dispersed and below the curve. Above 100 mm precipitation, there was a greater proximity of the points to the tendency, registering events that obeyed the correlation established by the authors, the that this curve could have been used in the Municipal Coordination of Protection and Civil Defense of João Pessoa (COMPDEC-JP). At end of the study, a new numerical relationship was established between accumulated precipitation (PA) of seven days and the daily precipitation (PD), including all the data registered from 2008: = 0.0021 ( ) 2 - 0.9231 ( ) 133.79