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Evolution sédimentologique et dynamique des charges solides dans l'hydrosystème fluvio-lagunaire du sud-ouest du Bénin
| Content Provider | Semantic Scholar |
|---|---|
| Author | Ernest, Amoussou Henri, Totin V. S. Christophe, Kaki Sotelle, Houessou Constant, Houndénou Mahé, Gil Lucien, Marc Blim, Blivi |
| Copyright Year | 2015 |
| Abstract | Sedimentological and dynamic evolution of sediment loads in the river-lagoon complex south-western Watersheds wet tropical environments are increasingly marked by degradation of land and water, related to multiple activities they offer to the riparian population. This anarchic occupation facilitated high erodibility of land and by corollary high turbidity of water courses and water bodies and therefore a reduction in the depth of the bed of the river-lagoon complex. The objective of this study is to evaluate the filling areas and digging beds and solid contributions to Benin river-lagoon complex from turbid expenses before and after the impoundment dam Nangbéto because it plays a role significant changes in terrigenous flows. The data are rainfall, flow rates, TSS, turbidity, sediment loading, bathymetry, land use land cover Landsat TM 1985 and 2000. TSS and turbidity of existing water, little masters available nevertheless assessed the sediment loads of water drained by the blades passed and precipitated in the complex. Bathymetry in turn, allows to analyze the evolution of complex sedimentological. The calculation of denudation rates and the climate of aggression Fournier (1962) allows also enjoy the effects of precipitation on land erosivity. To all this is added the field observation data. The results show that the degradation of the vegetation cover combined with maximum rainfall supports a priori a strong erosive soils and thus a high rate of denudation. Thus, transport of sediment loads from upstream to downstream intensified after the impoundment of the dam and deposits primarily operate in the downstream part, favored by reducing the depth of the lagoon system. Increased sediment loads to the bottom surface as late March, which is the beginning of the rainy season in the subequatorial area is recorded. The largest amounts of MES in the basin are recorded on average for 8% of the time of high water, more than previously estimated Fournier (2004) to 5%. This difference could be due to the size and also the rainfall regime in the basin river. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://hal.umontpellier.fr/hal-02146325/file/AMOUSSOU_2_total.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
