Analysis of Rain Variability Using the Daily and Monthly Concentration Indexes in Southeastern Brazil

Abstract

Daily and monthly rainfall was analyzed by the Concentration Index (CI) of [1] and the Annual Precipitation Concentration Index (PCI) of [2] in southeastern Brazil. About 120 rainfall stations were used in the period from 1976 to 2010. Data were obtained from the National Water Agency (ANA). These data were selected by observing their spatial and temporal distribution in the study area. In general, the Concentration Index and the Precipitation Concentration Index were consistent for the study of rainfall variability in the study area. High percentages of annual rainfall concentration in a few very rainy days can increase the risk of flooding and soil instability. In this work, a survey of the spatial and temporal patterns of daily and monthly rainfall concentration in southeast Brazil was conducted. The results showed a relatively homogeneous temporal distribution of daily rainfall in the study area. In addition, the Mann-Kendall test showed a clear trend towards a seasonal rainfall distribution.

Spatiotemporal variability of daily precipitation concentration and its relationship to teleconnection patterns over the Mediterranean during 1975–2015

“…Concentration index (CI) by Martin-Vide (2004) is based on the fact that the contribution of the days of a given rainfall to the total amounts of annual precipitation is generally adjustable by a negative exponential distribution. This method was used in many researches (Zubieta et al, 2016;Yin et al, 2016;Máyer et al, 2017;Nery et al, 2017;Royé and Martin, 2017;Sangüesa et al, 2018;Vyshkvarkova et al, 2018). The occurrence of high daily amounts can influence mean rainfall in any given period, month, season and year and affect soil erosion and increase its risk (Zubieta et al, 2016;He et al, 2017).…”

Investigating variations of precipitation concentration in the transitional zone between Qinling Mountains and Loess Plateau in China: Implications for regional impacts of AO and WPSH

“…Concentration index (CI), proposed by Martin-Vide [ 39 ], is an index that represents the concentration of daily precipitation. It mainly assesses the relative impacts of different magnitudes or classes of daily precipitation and evaluates the weight of the days recording the largest daily rainfall event [ 40 , 41 ]. In this study, a day with rainfall exceeding 0.1 mm was regarded as the rainy day, and 1 mm interval was used to classify rainfall events.…”

Precipitation concentration changes over India during 1951 to 2015

“…Author(s) agree that this article remain permanently open access under the terms of the Creative Commons Attribution License 4.0 International License world, e.g. Luis et al (2011) of Spain, Xuemei et al (2011) over Xinjiang, China, Adegun et al (2012, Iskander et al (2014) over Bangladesh, Benhamrouche et al (2015) in Algeria, Milan Gocic et al (2016) of Serbia, Al-Shamarti (2016) of Iraq, Nery et al (2017) over southeastern Brazil. However, very few studies regarding PCI mostly on regional scale are available in India, e.g.…”