Propriedades estatísticas das séries históricas de cota e vazão da bacia do rio Doce

Statistical properties of historical water level and flow rate series of the doce river basin

Abstract

The Doce River Basin holds immense socio-environmental, economic, and cultural significance, playing a vital role in the lives of local communities, regional biodiversity, and the preservation of water resources. For water resource planning, historical data series are commonly used. However, these series are not always statistically analyzed prior to use. Therefore, this study employed non-parametric tests using the statistical software R to assess the randomness, independence, homogeneity, and stationarity of the monthly mean water level and flow rate series of this basin. The results indicated that none of the stations had random series; four stations had independent series (three for water level and one for flow rate); 128 stations had homogeneous series (58 for water level and 70 for flow rate); and 148 stations had stationary series (76 for water level and 72 for flow rate). In conclusion, the historical data series exhibit consistent variations and should be thoroughly analyzed before being utilized.