CHARACTERIZATION OF THE AFFINITIES BETWEEN THE SUBWATERSHEDS OF ORDER 4 OF THE BANDAMA RIVER BY STATISTICAL ANALYSIS OF MORPHOMETRIC PARAMETERS

A. KOUDOU, Z.N. GAHI, T.V. ASSOMA, K.A. KOUAMÉ, Y.S. AGBEVO

Abstract


The objective of this study is to characterize the affinities between the subwatersheds of order 4 of the Bandama river by the statistical analysis of the morphometric parameters. It is conducted from the theoretical hydrographic network of the Bandama river. This hydrographic network is organized into a hierarchy and delineated, and its morphometric characteristics are determined. The study shows that the Bandama river is characterized by 21 subwatersheds of order 4, which mobilize slightly more than 59% of all the streams of this watershed. The standardized principal component analysis (standardized PCA) facilitated the regionalization of subwatersheds of order 4 by discriminating those with high shape values with a higher number of streams of order 1 to 4 combined from those with low shape values with a lower number of streams of order 1 to 4 combined. 7 distinct groups have been distinguished, among which the subwatersheds of order 4 with larger dimensions always stand out from the others. The main variables responsible for these groupings are area, perimeter, Gravelius compactness index, length and width. These results will contribute to a probable transposition of hydrometeorological data within the Bandama watershed for a better understanding of the irregularity of its hydrological behavior.


Keywords


Regionalization, Standardized PCA, Morphometric parameters, Subwatershed, Bandama, Côte d’Ivoire.

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References


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