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Original Articles

A new method for identification of flood seasons using directional statistics

Une nouvelle méthode utilisant des statistiques directionnelles pour l'identification des saisons de crues

, , , &
Pages 28-40 | Received 08 Nov 2011, Accepted 09 May 2012, Published online: 20 Nov 2012

Figures & data

Fig. 1 Frequencies analysis curves of annual maximum flow series generated by first-order AR model.

Fig. 1 Frequencies analysis curves of annual maximum flow series generated by first-order AR model.

Fig. 2 Results of statistical experiment with u′ following unimodal distribution in each sub-season.

Fig. 2 Results of statistical experiment with u′ following unimodal distribution in each sub-season.

Table 1 RMSE values of the statistical experiment based on the AR(1) model with a constant u t

Fig. 3 Distribution of flood peak in (a) Geheyan Reservoir basin and (b) Baishan Reservoir basin. Solid circles represent the IDS-Ι method and triangles represent the IDS-II method.

Fig. 3 Distribution of flood peak in (a) Geheyan Reservoir basin and (b) Baishan Reservoir basin. Solid circles represent the IDS-Ι method and triangles represent the IDS-II method.

Table 2 Results of IDS method for the Geheyan Reservoir basin

Table 3 Results of IDS method for the Baishan Reservoir basin

Table 4 Comparisons of the two versions of the IDS method, IDS-I and IDS-II (AE, the absolute error, is the magnitude of the difference between values of IDS-II and IDS-I, and the relative error is AE divided by the magnitude of the values of IDS-II)

Fig. 4 Simulated and fitted 95% confidence intervals using the uniform distribution.

Fig. 4 Simulated and fitted 95% confidence intervals using the uniform distribution.

Fig. 5 Values of uk for different flood identification schemes in: (a) Geheyan and (b) Baishan reservoir basins.

Fig. 5 Values of uk for different flood identification schemes in: (a) Geheyan and (b) Baishan reservoir basins.

Table 5 Comparison of different methods in the Geheyan and Baishan Reservoir basins

Fig. 6 Result of RF method for (a) Geheyan and (b) Baishan reservoir basins.

Fig. 6 Result of RF method for (a) Geheyan and (b) Baishan reservoir basins.

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