[ DYNAMIQUE SEDIMENTAIRE DANS LE BASSIN VERSANT DE LA RIVIERE WESHA, VILLE DE BUKAVU ]
Volume 20, Issue 1, January 2016, Pages 38–58
Richard BIRINDWA CUBWE1
1 Département de Géographie, Section des Sciences Exactes, Institut Supérieur Pédagogique de Walungu, RD Congo
Original language: French
Copyright © 2016 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
This work is examining the sediments which results by Wesha river localated in Bukavu town. It opens out on two periods of five months each, from decemer 2009 to April 2010 and october 2014 to february 2015. On the first period, Wesha river lively average of 7, 4 tons of sediments suspension per a day and after five years ago result is 13, 9 tons of sediments, it increases of 85% percent. The specific degradation passed at ~0, 9 tons of the soil full out square meter of 1, 7 tons at square meter per a day. The 13, 9 tons of sediments which are observed at outlet, find out the originat 44% at the underwatershed of Cidorhwe river wich joins Wesha river at 1km to one's mouth. The new out break of sediments explain with speed up human activity in the watershed wich has 3000 household in 2009 to 5000 household in2014. The latter is responsible of soil bared on slopes sensitive to water erosion wich appears under aggressive climate (rainy period) of this region full of mountains.
Author Keywords: measure of flow measurement, dynamic sedimentary, watershed, human activity.
Volume 20, Issue 1, January 2016, Pages 38–58
Richard BIRINDWA CUBWE1
1 Département de Géographie, Section des Sciences Exactes, Institut Supérieur Pédagogique de Walungu, RD Congo
Original language: French
Copyright © 2016 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
This work is examining the sediments which results by Wesha river localated in Bukavu town. It opens out on two periods of five months each, from decemer 2009 to April 2010 and october 2014 to february 2015. On the first period, Wesha river lively average of 7, 4 tons of sediments suspension per a day and after five years ago result is 13, 9 tons of sediments, it increases of 85% percent. The specific degradation passed at ~0, 9 tons of the soil full out square meter of 1, 7 tons at square meter per a day. The 13, 9 tons of sediments which are observed at outlet, find out the originat 44% at the underwatershed of Cidorhwe river wich joins Wesha river at 1km to one's mouth. The new out break of sediments explain with speed up human activity in the watershed wich has 3000 household in 2009 to 5000 household in2014. The latter is responsible of soil bared on slopes sensitive to water erosion wich appears under aggressive climate (rainy period) of this region full of mountains.
Author Keywords: measure of flow measurement, dynamic sedimentary, watershed, human activity.
Abstract: (french)
Ce travail examine les sédiments transportés par la rivière Wesha, dont le bassin versant est localisé dans la ville de Bukavu. Il se base sur des mesures de matière en suspension effectuées sur deux périodes de cinq mois chacune, soit de décembre 2009 à avril 2010 et d'octobre 2014 à février 2015. La première campagne de mesure montre que la rivière entrainait en moyenne 7,4 tonnes de sédiments en suspension par jour alors que cinq ans plus tard elle entrainait 13,9 tonnes, soit une augmentation de plus de 85 %. La dégradation spécifique est alors passée de ~0,9 tonne de sols arrachés par km² par jour à 1,7 tonne. Les 13,9 tonnes de sédiments observées à l'exutoire, trouvent leur origine à 44% dans le sous bassin versant de la rivière Cidorhwe qui rejoint la Wesha à 1 km de son embouchure. L'augmentation des sédiments s'explique par l'anthropisation accélérée du bassin versant qui comptait 3000 ménages en 2009 et 5000 ménages en 2014. Celle-ci est responsable d'une dénudation des sols sur des pentes sensibles à l'érosion hydrique qui apparait sous le climat agressif (pluvieux) de cette région montagneuse.
Author Keywords: mesure de débit, dynamique sédimentaire, bassin versant, anthropisation.
How to Cite this Article
Richard BIRINDWA CUBWE, “DYNAMIC SEDIMENTARY IN WATERSHED OF WESHA RIVER, BUKAVU CITY,” International Journal of Innovation and Scientific Research, vol. 20, no. 1, pp. 38–58, January 2016.
