Intensity-duration-frequency ratios obtained from annual records and partial duration records in the locality of Pelotas - RS, Brazil

Engenharia Agrícola

Claudia F. A. Teixeira²  Rita De C. F. Damé²  José L. C. Rosskoff¹ 

[1] ,Universidade Federal de Pelotas Centro de Engenharias

关键词: maximum rainfall;    daily disaggregated precipitation;    probability models;    chuva máxima;    desagregação de chuva diária;    modelos probabilísticos;   

DOI  :  10.1590/S0100-69162011000400007

来源: SciELO

【 摘 要 】

The intensity-duration-frequency occurrence ratio (IDF) is a tool commonly used for precipitation-runoff data transformation, which is established from observations of intense precipitations over a period sufficiently long as to allow the occurrence of extremes at the observation site. This study focused on verifying the existence or absence of new data, in terms of IDF ratio, by using partial duration records produced from data on maximum daily disaggregated rainfall for pre determined durations. The partial duration records considered a base value of 55 mm, totaling 279 values. After the rainfall series were established, their independence and seasonality were assessed. Using the Student's t-test statistics, it was established that no new data, as IDF ratio, emerged from the analysis of the partial duration series with the recommended base value of precipitation, as compared to the historical records.

【 授权许可】

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