Effectiveness of measures aiming to stabilize urban gullies in tropical cities:Results from field surveys across D.R.Congo  

作　　者：Eric Lutete Landu Guy Ilombe Mawe Fils Makanzu Imwangana Charles Bielders Olivier Dewitte Jean Poesen Aurélia Hubert Matthias Vanmaercke 

机构地区：[1]Department of Geography(U.R.SPHERES),University of Liege,Clos Mercator 3,4000,Liège,Belgium [2]Department of Geoscience,University of Kinshasa,Kinshasa Mont-Amba,Congo [3]Department of Natural resources management,University of Kinshasa,Kinshasa Mont-Amba,D.R Congo [4]Department of Geology,Oficial University of de Bukavu,Congo [5]Geomorphology and Remote Sensing Laboratory,Center for Geological and Mining Research,Congo [6]Earth and Life Institute-Environmental Sciences,Universite catholique de Louvain,Croix du sud 2,L7.05.02,1348,Louvain-la-Neuve,Belgium [7]Royal Museum for Central Africa,Leuvensesteenweg 13,B-3080,Tervuren,Belgium [8]Department of Earth and Environmental Sciences,KU Leuven,Celestijnenlan 200E,3001,Heverlee,Belgium [9]Institute of Earth and Environmental Sciences,Maria-Curie Sklodowska University(UMCS),Krasnicka 2D,20-718,Lublin,Poland

出　　处：《International Soil and Water Conservation Research》2023年第1期14-29,共16页国际水土保持研究（英文）

摘　　要：Urban gullies are a rapidly growing concern in many tropical cities of the Global South.Various measures are already implemented for their stabilization.However,an overview of these measures and their overall effectivenesss is currently lacking.We aim at addressing this gap by documenting existing ini-tiatives to stabilize urban gullies in D.R.Congo and assessing their overall effectiveness.To this end we conducted extensive field campaigns in Kinshasa,Kikwit and Bukavu and combined our terrain obser-vations with data on gully expansion rates(derived from series of satellite imagery).In total,we char-acterized present and past stabilization initiatives for 398 urban gullies.For 69 of these gullies,the effect of a specific measure on gully expansion rates could be estimated.Results show that for the large ma-jority of gullies,various measures have been implemented.Yet,these are mainly ad-hoc measures installed by the affected population.More structural measures based on larger engineering works were observed for only 20-30%of gullies.The huge efforts invested in the installation of measures strongly contrast with their overall low impact Among all strategies,only the deviation of runoff resulted in significantly lower expansion rates after installation.The numerous initiatives that rely on the sparse means available seem to have limited effects.This does not imply,however,that they are completely ineffective and should be abandoned.Based on our findings,we formulate recommendations for further research on how to effectively prevent and stabilize urban gullies,taking into account the difficult environmental and socio-economic context.

关 键 词：Gully expansion rate Head and channel measures Catchment measures Global South Urban hazard 

分 类 号：S157[农业科学—土壤学]