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Utilisation du système d’information géographique et modèle numérique de terrain dans l’analyse des caractéristiques hydro-morphométriques des sous-bassins versants de la rivière Tshopo,République démocratique du Congo Use of Geographic Information System and Digital Elevation Model to Analyze the Hydro-Morphometric Characteristics of the Tshopo River Sub-Catchments,Democratic Republic of Congo

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Revue Internationale de Géomatique 2023年第1期32卷 99-122页

作者： Faidance Mashauri mokili mbuluyo Nsalambi Nkongolo Département de Géologie Facultédes Sciences et TechnologiesUniversitéde l’UéléIsiroBP 670République démocratique du Congo Département de Sciences du Sol et de l’Eau Institut Facultaire des Sciences Agronomiques(IFA)de YangambiKisanganiBP 1232République démocratique du Congo Département de Géologie Facultédes Sciences et TechnologiesUniversitéde KisanganiKisanganiBP 2012République démocratique du Congo Geographic Information Technology Program School of ScienceNavajo Technical UniversityCrownpointNew MexicoUSA

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 ***,few studies have been carried out to assess these characteristics at the scale of this *** 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 *** enabled us to automatically extract the hydrographic network and generate the Tshopo *** 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 *** are elongated in shape,with a coefficient of compactness(KG)of between 1.84 and *** 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/*** duration of run-off concentration(Tc)varies between 30.2 and 70.2 h in the tributaries of the *** hydrographic network is dense,with drainage densities(Dd)ranging from 0.91 to 1.72 km/*** watercourses form a homogeneous dendritic network,but with local *** some places,the network can take on a parallel or rectangular shape.

关键词： Morphometry DEM GIS hypsometry hydrographic network sub-catchments Tshopo river

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Influence des paramètres hydro-morphométriques sur l’écoulement des eaux des sous-bassins versants de la Tshopo,République démocratique du Congo Influence of Hydro-Morphometric Parameters on Water Flow in the Tshopo Sub-Catchments,Democratic Republic of Congo

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Revue Internationale de Géomatique 2023年第1期32卷 79-98页

The most characteristic hydro-morphometric parameters controlling water flow in the Tshopo catchment have not yet been *** 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 *** results highlight the importance of topography on water *** 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 *** 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).

关键词： Hydro-morphometric parameters correlation analysis multiple linear regression hierarchical ascending classification sub-catchments Tshopo river

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