The analysis and quantification of hydro-morphometric characteristics are essential for better management of water resources and more effective planning of hydroelectric projects in the Tshopo basin.Unfortunately,few ...The analysis and quantification of hydro-morphometric characteristics are essential for better management of water resources and more effective planning of hydroelectric projects in the Tshopo basin.Unfortunately,few studies have been carried out to assess these characteristics at the scale of this basin.Our methodological approach consists of using Geographic Information System(GIS)software analysis tools applied to the Digital Elevation Model(DEM)derived from the Advanced Land Observing Satellite(ALOS)World 3D-30m image.This enabled us to automatically extract the hydrographic network and generate the Tshopo sub-watersheds.The results of this analysis show that the Tshopo catchment area is of the order of magnitude 7.A total of 8 sub-watersheds were identified,covering an area of around 19,335 km2.They are elongated in shape,with a coefficient of compactness(KG)of between 1.84 and 2.52.Average slopes are low,ranging from 0.84%to 3.58%.Run-off velocity is generally low,with a velocity range(Ve)of 2.3 to 4.79 km/h.The duration of run-off concentration(Tc)varies between 30.2 and 70.2 h in the tributaries of the Tshopo.The hydrographic network is dense,with drainage densities(Dd)ranging from 0.91 to 1.72 km/km2.The watercourses form a homogeneous dendritic network,but with local variations.In some places,the network can take on a parallel or rectangular shape.展开更多
The most characteristic hydro-morphometric parameters controlling water flow in the Tshopo catchment have not yet been determined.Correlation analysis,multiple linear regression and hierarchical ascending classificati...The most characteristic hydro-morphometric parameters controlling water flow in the Tshopo catchment have not yet been determined.Correlation analysis,multiple linear regression and hierarchical ascending classification were applied to all the data in order to identify the most characteristic variables that significantly influence water flow velocity,and to group together physically similar sub-catchments.The results highlight the importance of topography on water flow.Three topographical variables,namely median altitude(H50),overall gradient(Dg)and specific gradient(Ds),have a significant influence(p-value≤0.05)on surface water flow velocity(Ve)in the Tshopo sub-catchments.Two opposing groups(G1 and G2)of sub-catchments were identified,on the one hand the sub-catchments belonging to the upper and middle course of the Tshopo(SBV1,SBV2,SBV3 and SBV5)and on the other the sub-catchments of the lower course(SBV6,SBV7 and SBV8).The first group is characterized by moderate relief(Ds ranging from 53.19 to 73.6 m),while the second group has low relief(Ds ranging from 18.1 to 29.43 m).展开更多
文摘The analysis and quantification of hydro-morphometric characteristics are essential for better management of water resources and more effective planning of hydroelectric projects in the Tshopo basin.Unfortunately,few studies have been carried out to assess these characteristics at the scale of this basin.Our methodological approach consists of using Geographic Information System(GIS)software analysis tools applied to the Digital Elevation Model(DEM)derived from the Advanced Land Observing Satellite(ALOS)World 3D-30m image.This enabled us to automatically extract the hydrographic network and generate the Tshopo sub-watersheds.The results of this analysis show that the Tshopo catchment area is of the order of magnitude 7.A total of 8 sub-watersheds were identified,covering an area of around 19,335 km2.They are elongated in shape,with a coefficient of compactness(KG)of between 1.84 and 2.52.Average slopes are low,ranging from 0.84%to 3.58%.Run-off velocity is generally low,with a velocity range(Ve)of 2.3 to 4.79 km/h.The duration of run-off concentration(Tc)varies between 30.2 and 70.2 h in the tributaries of the Tshopo.The hydrographic network is dense,with drainage densities(Dd)ranging from 0.91 to 1.72 km/km2.The watercourses form a homogeneous dendritic network,but with local variations.In some places,the network can take on a parallel or rectangular shape.
文摘The most characteristic hydro-morphometric parameters controlling water flow in the Tshopo catchment have not yet been determined.Correlation analysis,multiple linear regression and hierarchical ascending classification were applied to all the data in order to identify the most characteristic variables that significantly influence water flow velocity,and to group together physically similar sub-catchments.The results highlight the importance of topography on water flow.Three topographical variables,namely median altitude(H50),overall gradient(Dg)and specific gradient(Ds),have a significant influence(p-value≤0.05)on surface water flow velocity(Ve)in the Tshopo sub-catchments.Two opposing groups(G1 and G2)of sub-catchments were identified,on the one hand the sub-catchments belonging to the upper and middle course of the Tshopo(SBV1,SBV2,SBV3 and SBV5)and on the other the sub-catchments of the lower course(SBV6,SBV7 and SBV8).The first group is characterized by moderate relief(Ds ranging from 53.19 to 73.6 m),while the second group has low relief(Ds ranging from 18.1 to 29.43 m).
