Spatial distribution of nutrients and risk of eutrophication of Lake
Tengrela in the municipality of Banfora in Burkina Faso.
Abstract
The study characterises the spatial distribution of a selection of
nutrients from the literature review. A relationship is also established
between the selected nutrients and chlorophyll a, which is
characteristic of the trophic level of a water body. We used data from
water withdrawals during the high and low water seasons, linked to
specific coordinates, but also surveys of 36 producers around the shores
of the lake. Our results show different levels of nutrients in the water
body, modelled according to the lake’s right of way. The spatial
distribution of aquatic species is also disparate, as they are strongly
correlated with these nutrients, and the distribution of nutrients in
the water body depends on seasonality and parameters and the presence of
macrophytes according to the presence of nutrients. As for the farmers,
100% of them use chemical fertilisers and organic manure in their
production. These practices increase the presence of nutrients in the
water body. Our results confirm the fact that the spatial analysis of
the distribution of nutrients in the water body is, on the one hand,
strongly linked to the agricultural activities around the shores of the
lake and that they have an impact on the health of the lake. This
analysis will make it possible to understand and know the most
influential and problematic nutrient for the proper management of this
water body.