TITLE:
Accessibility Index of Aquatic Environments as an Indicator of Surface Water Vulnerability in Urban Areas: Case of the Okpara Basin (Benin)
AUTHORS:
Maurille P. S. Lanmandjèkpogni, François De Paule Codo, Babilas Hountondji, Benjamin Kouassi Yao
KEYWORDS:
Accessibility, Risk, Vulnerability, Index, Okpara
JOURNAL NAME:
Open Journal of Modern Hydrology,
Vol.9 No.4,
September
12,
2019
ABSTRACT:
Physiographic
differences and conditions of use of water resources in anthropogenic basins
explain the variability of risk to surface water. Based on the multi-criteria
analysis of Saaty, the present work proposes an assessment of the vulnerability
of surface water through a three-factor accessibility index: the slope,
the subdivision rate and the drainage density of the basin. It is observed that
the topographic (slope) and urbanistic (subdivision) conditions are the most
important (weighting of 59%, 34%) in front of the hydrographic condition
(drainage 6%) with an overall consistency of 2%. Thus, in the Okpara basin in
the city of Parakou, the analysis of the vulnerability of surface waters by the
accessibility index highlights two groups. The
Ganré and Kokouro basins with about 30% of their areas in the low and moderate
classes and the Wonka and Dama basins in the very strong class at more than 50%
of their areas.