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

• 作者: Ana Claudia Carfan Javier Martin-Vide Jonas T. Nery
• 来源期刊: 大气和气候科学(英文)
• 学科: 地球科学
• 关键词: CONCENTRATION Indices VARIABILITY RAIN SOUTHEAST Brazil
• 年，卷（期）: 2017,（2）
• 页码范围: 176-190
• 页数: 15页
• 分类号: P4

摘要

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.