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Résultats de la recherche (197 résultats)

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  • Paleoenvironmental changes during the last 4000 yr in the Tigray, Northern Ethiopia
  • C 14 dating ; Ethiopia ; Geochronology ; Holocene ; Land use ; Palaeo-environment ; Palaeoclimate ; Stratigraphy ; Thermoluminescence
  • In this study, a high-resolution sequence of the main degradational and stability phases during the past 4000 yr in Northern Ethiopia, and in the Ethiopian Highlands in general, is presented. The paleoenvironmental reconstruction involved the use
  • Reservoir siltation in the semi-arid highlands of northern Ethiopia : sediment yield-catchment area relationship and a semi-quantitative approach for predicting sediment yield
  • Ethiopia ; Forecast ; Mountain ; Quantitative analysis ; Reservoir ; Sediment budget ; Sedimentation ; Semi-arid area ; Suspended load ; Watershed
  • Reservoir surveys were conducted to estimate sediment deposition rate for 11 reservoirs identified to be representative of catchments in the Tigray region of northern Ethiopia. Field surveys were conducted to characterize the catchments in terms
  • of erosional susceptibility based on factorial scoring approach. Finally, the factorial index was integrated with the catchment area to develop a semi-quantitative sediment yield potential prediction model for the highlands of northern Ethiopia.
  • Spatial distribution of rock fragments in cultivated soils in northern Ethiopia as affected by lateral and vertical displacement processes
  • Agricultural practice ; Arid area ; Cultivated land ; Desertification ; Ethiopia ; Rill wash ; Semi-arid area ; Slope gradient ; Soil ; Spatial distribution
  • of rock fragment cover along catenas, and the vertical variations in volumetric rock fragment content in soil profiles in the highlands of Tigray, northern Ethiopia. Natural and anthropogenic processes inducing these patterns are assessed.
  • Surface runoff and seed trapping efficiency of shrubs in a regenerating semiarid woodland in northern Ethiopia
  • Ethiopia ; Forest ; Microrelief ; Plant canopy ; Rainfall simulation ; Reforestation ; Runoff ; Scrub ; Semi-arid area ; Soil erosion
  • seeds in the bare inter-plant areas; and that seeds in the latter are more likely to be translocated by runoff to microsites under shrubs than to other open areas. The study area is located in the Geba river catchment, central Tigray, northern Ethiopia.
  • Analysis of factors determining sediment yield variability in the highlands of northern Ethiopia
  • Arid area ; Environmental management ; Ethiopia ; Gully erosion ; Lithology ; Mountain ; Regression analysis ; Sediment budget ; Soil erosion ; Spatial variation ; Vegetation ; Watershed
  • In this study, reservoir sedimentation and corresponding catchment attribute data were used to investigate the major factors controlling sediment yield variability in a mountainous dryland region of northern Ethiopia. Sediment yield data were
  • Dynamics of Gully and River Channel Erosion in Northern Ethiopia : Diachronic Analysis of Terrestrial Photographs
  • Erosion control ; Ethiopia ; Fluvial erosion ; Gully erosion ; Photointerpretation ; Soil erosion ; Time series ; Water erosion
  • Effects of region-wide soil and water conservation in semi-arid areas : the case of northern Ethiopia
  • Arid area ; Ecosystem ; Ethiopia ; Gully erosion ; Plant canopy ; Rill wash ; Semi-arid area ; Soil conservation ; Soil erosion ; Water erosion
  • Assessing drought risk and irrigation need in northern Ethiopia
  • Agricultural production ; Agroclimatology ; Drought ; Ethiopia ; Irrigation ; Risk management ; Time series ; Water management
  • The Mai Maikden sedimentary sequence : a reference point for the environmental evolution of the Highlands of Northern Ethiopia
  • Alluvium ; C 14 dating ; Climatic variation ; Ethiopia ; Holocene ; Palaeo-environment ; Palaeovalley ; Sedimentary ; Travertine
  • Problems of the solution : intervention into small-scale irrigation for drought proofing in the Mekele Plateau of northern Ethiopia
  • Agricultural use ; Agroecosystem ; Drought ; Ethiopia ; Irrigation ; Irrigation system ; Plateau ; Semi-arid area ; Water management
  • The environmental significance of the remobilisation of ancient mass movements in the Atbara-Tekeze headwaters, Northern Ethiopia
  • Dating ; Ethiopia ; Gully erosion ; Land use ; Landscape ; Mass movement ; Mudflow ; Palaeo-environment ; Palynology ; Quaternary ; Rill wash ; Soil erosion ; Soil moisture
  • Specific sediment yield in Tigray-Northern Ethiopia : assessment and semi-quantitative modelling
  • Ethiopia ; Model ; Reservoir ; Sediment budget ; Sedimentation ; Soil erosion ; Water management ; Watershed
  • Performance of exclosure in restoring soil fertility : A case of Gubalafto district in North Wello Zone, northern highlands of Ethiopia
  • Agropedology ; Arid area ; Ecological restoration ; Ethiopia ; Northern Ethiopia ; Soil ; Soil degradation ; Soil properties
  • The aim of this study was to analyze the impact of exclosures on soil fertility restoration and examine its variability across age, agro-ecology and landscape position. The study was conducted in the Gubalafto district of North Wello Zone, northern
  • Factors controlling the morphology and volume (V)–length (L) relations of permanent gullies in the northern Ethiopian Highlands
  • Aerial photography ; Dam ; Drainage network ; Ethiopia ; Gully erosion ; Lithology ; Mountain ; Northern Ethiopia ; Satellite imagery ; Slope gradient ; Spatial analysis ; Watershed
  • requires that empirical relations between gully volume (V) and length (L) are established in the field. In this study, V–L relations were established for permanent gullies in northern Ethiopia. In order to take the regional variability in environmental
  • Small-scale aerial photographs and high-resolution satellite images, available for Ethiopia since the second half of the twentieth century, allow only the length of gullies to be determined. Understanding the development of gully volumes therefore
  • Arid area ; Clay mineral ; Ethiopia ; Seasonal variation ; Soil ; Soil properties ; Soil water ; Vertisol
  • This paper presents the case of a natural rock fragment (RF) mulch whose lithology indicates that the RF are up-squeezed by the local vertisol. Based on the data from the experimental site located in the pass of Enda Maryam, Tigray, Northern
  • Ethiopia, for the period 01/1999-05/2003, this study aims to provide a better understanding of the process of up-squeezing and underground structures and soil displacements.
  • Integrated geological-architectural pilot study of the Biet Gabriel-Rufael rock hewn church in Lalibela, northern Ethiopia
  • Architectural legacy ; Architecture ; Engineering geology ; Ethiopia ; Fault ; Geophysics ; Human impact ; Northern Ethiopia ; Patrimony ; Regional geology ; Rock mechanics ; Site preservation
  • A participatory soil quality assessment in Northern Ethiopia's Mai-Negus catchment
  • Agricultural land use ; Environmental management ; Erosion control ; Ethiopia ; Indicator ; Local knowledge ; Participation ; Soil erosion ; Soil properties ; Sustainable development ; Watershed
  • This paper presents experiences of local communities in diagnosis of soil quality (SQ) and assesses the contribution of local knowledge as a strategy for sustainable development decision making within the Mai-Negus catchment of northern Ethiopia
  • Assessment of gully erosion rates through interviews and measurements : a case study from northern Ethiopia
  • Cultivated land ; Environmental management ; Erosion rate ; Ethiopia ; Gully erosion ; Land use ; Methodology ; Soil erosion ; Watershed
  • developed. It comprises measurements of contemporary gully volumes, monitoring of gully evolution over several years and semi-structured interview techniques. Gully erosion rates in the Dogu'a Tembien District, Tigray, Ethiopia, were estimated in 3
  • Spatial and temporal variability of river flows in the degraded semi-arid tropical mountains of northern Ethiopia
  • Discharge ; Ethiopia ; Flash flood ; Mountain ; Semi-arid area ; Space time ; Spatial variation ; Stream ; Stream flow ; Water resources
  • This study assesses the runoff from 10 medium-sized catchments in the Geba river basin, a subcatchment of the Nile in the semi-arid degraded northern Ethiopian highlands. Flow depth records were automatically obtained every 10 minutes during
  • New geoarchaeological investigations of the valley systems in the Aksum area of northern Ethiopia
  • Agricultural land use ; Archaeology ; Ethiopia ; Geoarchaeology ; Human impact ; Land use ; Micromorphology ; Soil ; Soil properties