Author(s): Shiang-Jen Wu; Yeou-Koung Tung; Jinn-Chuang Yang
Linked Author(s): Jinn-Chuang Yang
Keywords: Frequency analysis; Annual maximum series; Rainfall depth-duration frequency relationship
Abstract: This paper presents a model to estimate hourly-based rainfall depth-duration frequency (DDF) relationships utilizing daily rainfall information. In the model, total rainfall amount of a rainy day and the corresponding maximum rainfall of various durations are used. The performance of the proposed model is evaluated by comparing the DDF relationships derived by the proposed model with those obtained by the conventional frequency analysis using the annual maximum series. Hourly rainfall data at the Hong Kong Observatory over the period of 1884-1990 are used to demonstrate application of the proposed model. From the numerical experiments, the proposed model is found to yield more accurate and reliable annual maximum rainfall DDF relations than the conventional method based on concurrently available annual maximum hourly rainfalls, especially for the short durations (e. g., 1-hr, 2-hr and 6-hr). The proposed model also shows promising potential to improve the accuracy of rainfall DDF relationships by incorporating extended daily rainfall record.
Year: 2005