Interpretation of New Trends in Flood Frequency Analysis: A Case Study

Date

2008-05-27

Author

Yanmaz, Ali Melih
Kentel Erdoğan, Elçin

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Conventional flood frequency analyses are based on use of a suitable univariate probability density function for maximum annual discharges. This approach is not robust enough since it deals only with the statistical distribution of annual series of peak discharges. However, flood events are better characterized by the peak discharge, volume of runoff, and the duration of the flood jointly. That is why there is a growing trend in the formulation of multivariate flood frequency analyses. A bivariate flood frequency analysis is performed in which the annual maximum peak discharges and the corresponding surface runoff volumes of flood are handled as random variables. The results of both approaches, i.e. univariate and multivariate cases show differences. Therefore, choice of a method for such a study would influence the design and operation of hydraulic structures for high flows. In this paper, a case study has been performed for a basin in Turkey to account for the effect of the differences in the application of the aforementioned approaches. Various bivariate probability density functions have been applied and tested for goodness. Use of these analyses and suitability of these functions in characterizing the nature of flood events are discussed. The results of a bivariate analysis are also compared with the findings of a univariate analysis carried out using a number of probability density functions. Furthermore, an example is presented to illustrate the effect of the approach used in the flood frequency analysis on the dimensions of a flood detention dam located in the basin.

Subject Keywords

Flood frequency, Bivariate analysis, Peak discharge, Surface runoff volume

URI

https://hdl.handle.net/11511/82150

Conference Name

"Interpretation of New Trends in Flood Frequency Analysis: A Case Study", International Conference on Water Observation and Information System for Decision Support, Ohrid, Makedonya, 27 - 31 Mayıs 2008

Collections

Department of Civil Engineering, Conference / Seminar

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Citation Formats

A. M. Yanmaz and E. Kentel Erdoğan, “Interpretation of New Trends in Flood Frequency Analysis: A Case Study,” presented at the “Interpretation of New Trends in Flood Frequency Analysis: A Case Study”, International Conference on Water Observation and Information System for Decision Support, Ohrid, Makedonya, 27 - 31 Mayıs 2008, Ohrid, Makedonya, 2008, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/82150.