The Rwenzori Mountains,a landslide-prone region?     

Liesbet Jacobs  Olivier Dewitte  Jean Poesen  Damien Delvaux  Wim Thiery  Matthieu Kervyn 《Landslides》2016,13(3):519-536

With its exceptionally steep topography, wet climate, and active faulting, landslides can be expected to occur in the Rwenzori Mountains. Whether or not this region is prone to landsliding and more generally whether global landslide inventories and hazard assessments are accurate in data-poor regions such as the East African highlands are thus far unclear. In order to address these questions, a first landslide inventory based on archive information is built for the Rwenzori Mountains. In total, 48 landslide and flash flood events, or combinations of these, are found. They caused 56 fatalities and considerable damage to road infrastructure, buildings, and cropland, and rendered over 14,000 persons homeless. These numbers indicate that the Rwenzori Mountains are landslide-prone and that the impact of these events is significant. Although not based on field investigations but on archive data from media reports and laymen accounts, our approach provides a useful complement to global inventories overlooking this region and increases our understanding of the phenomenon in the Rwenzori Mountains. Considering the severe impacts of landslides, the population growth and related anthropogenic interventions, and the likelihood of more intense rainfall conditions, there is an urgent need to invest in research on disaster risk reduction strategies in this region and other similar highland areas of Africa.  相似文献   

Reconstruction of a flash flood event through a multi-hazard approach: focus on the Rwenzori Mountains,Uganda     

Liesbet Jacobs  Jan Maes  Kewan Mertens  John Sekajugo  Wim Thiery  Nicole van Lipzig  Jean Poesen  Matthieu Kervyn  Olivier Dewitte 《Natural Hazards》2016,84(2):851-876

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Historical changes in the traditional agrarian systems of Burundi: endogenous drive to survive from food insecurity     

Niragira  Sanctus  D’Haese  Marijke  Buysse  Jeroen  Van Orshoven  Jos  Ndimubandi  Jean 《GeoJournal》2021,86(2):865-884

GeoJournal - The global farming conditions have gone profound mutations that steadily increased vulnerability among smallholder farmers. As consequence, rural households have set mechanisms of...  相似文献   

Three‐dimensional indoor network accessibility auditing for floor plan design          下载免费PDF全文

Thi Hong Diep Dao  Jean‐Claude Thill 《Transactions in GIS》2018,22(1):288-310

Built environments have played an increasingly important and complex role in contemporary cities in the face of the significant number of discretionary and non‐discretionary event‐based activities that take place indoors, and the great variety of three‐dimensional designs that indoor spaces have grown to assume. However, intelligent tools that can assist designers to achieve high accessibility, particularly for large and complex buildings, are still underdeveloped. This article presents an innovative custom computer‐based design tool, dubbed FloorplanAAU (floor plan accessibility auditing), that couples GIS data modeling, indoor traversable network accessibility analysis, and interactive three‐dimensional visualization for built environments, to interactively evaluate and audit floor plans for high accessibility. The proposed method contributes to the success of applying GIS and transportation geography concepts to establish computational tools toward intelligent design and assessment of built environments.  相似文献   

TM/ETM+/LDCM Images for Studying Land Surface Temperature (LST) Interplay with Impervious Surfaces Changes over Time Within the Douala Metropolis,Cameroon     

Salomon Cesar Nguemhe Fils  Mumbfu Ernestine Mimba  Jean Guy Dzana  Joachim Etouna  Patrick Valerie Mounoumeck  Mustapha Hakdaoui 《Journal of the Indian Society of Remote Sensing》2018,46(1):131-143

Douala, the most important metropolis of Cameroon, is a sub-Saharan wet coastal environment of which the anarchic urbanization is a socio-economic and environmental problem, significantly influencing the local climate. In this study, three Landsat images from 1986 (TM), 2007 (ETM+) and 2016 (LDCM), were utilized to investigate the effect of this urbanization on the increasing land surface temperature (LST) between these dates. Thus, the urban indices (UI), determined from the Landsat Visible and NIR channels were used to identify impervious areas (Urban Fabric and bare soil) of urban area. It has been shown from the UI images that, impervious areas have been increased from 1986 to 2016. The LST images derived have a continual expansion of zones and points of heat throughout these dates. The correlation analysis of LST and UI, at the pixel-scale, indicated the positive relationship between these parameters, which could show a real impact of urbanization on the increasing temperature in the area. These correlations are fairly low in 1986 (maximum R-square value is about 0.35) and in 2007 (maximum R-square value is about 0.44. In 2016, a high positive correlation (maximum R-square value is about 0.77) confirm that, the impervious areas strengthen the temperature and the Urban Heat Island effect in Douala urban zone. Overall, the earth observation images and the geographic information system techniques were effective approaches for aiming at environment monitoring and analyzing urban growth patterns and evaluating their impacts on urban climates.  相似文献   

Assessment of Lateritic Gravelled Materials for Use in Road Pavements in Cameroon     

Foko Tamba  Carlos  Kengni  Lucas  Tematio  Paul  Manefouet  Bertile Ilalie  Kenfack  Jean Victor 《Geotechnical and Geological Engineering》2022,40(8):4195-4215

Geotechnical and Geological Engineering - Early surface and structural deterioration of new pavements are becoming increasingly perceptible in Cameroon. This raises serious concerns regarding the...  相似文献   

Mud depocenters on continental shelves—appearance,initiation times,and growth dynamics   总被引：1，自引：0，他引：1  

Till J. J. Hanebuth  Hendrik Lantzsch  Jean Nizou 《Geo-Marine Letters》2015,35(6):487-503

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The 2011 Draconids: The First European Airborne Meteor Observation Campaign     

Jeremie Vaubaillon  Pavel Koten  Anastasios Margonis  Juraj Toth  Regina Rudawska  Maria Gritsevich  Joe Zender  Jonathan McAuliffe  Pierre-Dominique Pautet  Peter Jenniskens  Detlef Koschny  Francois Colas  Sylvain Bouley  Lucie Maquet  Arnaud Leroy  Jean Lecacheux  Jiri Borovicka  Junichi Watanabe  Jürgen Oberst 《Earth, Moon, and Planets》2015,114(3-4):137-157

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Aseismic deformation in the Alps: GPS vs. seismic strain quantification     

Christian Sue  Bastien Delacou  Jean‐Daniel Champagnac  Cecile Allanic  Martin Burkhard 《地学学报》2007,19(3):182-188

Neotectonics of the Western and Central Alps is characterized by ongoing widespread extension in the highest zones of the chain and transcurrent/compressive tectonics at the external limits of the belt. The overall geodetically measured deformations also indicate extension across the Western Alps. There is a good qualitative coherency between seismotectonic and geodetic approaches. Here we attempt to quantify the seismic part of the deformation. The seismic strain is compared to the deformation derived from geodesy. In sub‐areas of homogeneous seismic stress/strain, we computed the total seismic moment tensor and related strain tensor. This study provides new quantitative elements about the ongoing geodynamic processes in the alpine belt. The important discrepancies obtained between seismic strains and geodetically‐measured deformations raise the issue of aseismic deformation in the Alps, which could be related to elastic loading, creeping and/or a slower ductile‐style deformation.  相似文献   

The ground calibration setup of OMEGA and VIRTIS experiments: description and performances     

Guillaume Bonello  Jean Pierre Bibring  Alain Soufflot  Yves Langevin  Brigitte Gondet  Michel Berthé  Charles Carabetian 《Planetary and Space Science》2005,53(7):711-728

Hyperspectral imagery is an essential technique for remote sensing of surfaces and atmospheres of planetary objects. However, given the instrumental complexity of coupling imaging and spectroscopy, in particular in the infrared, an in-depth ground calibration is mandatory to enable an unbiased and optimized data reduction.This paper presents the ground calibration setup designed and implemented for the visible and near infrared imaging spectrometers VIRTIS/ROSETTA, and OMEGA/MARS-EXPRESS, and summarizes the main results obtained in validating the required performances.  相似文献