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| 1 | EVALUATION OF TOPOGRAPHIC INDICES FOR EPHEMERAL-GULLY EROSION ASSESSMENT显示文摘Soil erosion by concentrated flows in agricultural areas is an important process affecting soil losses and landscape degradation. The main factors controlling concentrated flow erosion include the erodibility of materials, soil use and management, climate, and watershed topography. In this paper, two topographic indices, closely related with mathematical expressions suggested by different authors, are used to characterize the influence of watershed topography on gully erosion. The AS1 index is defined as the product of the watershed area and the partial area-weighted average slope. The AS2 index is the product of the watershed area and the length-weighted average swale slope. Using different ephemeral gully erosion databases, a high correlation was found between the topographic indices and the volume of eroded soil. The accuracy of different methods for field measurement of ephemeral gullies was evaluated to ensure that the relation between erosion and topographic indices is not affected by assessment errors. The resulting relation are useful to assess soil losses from gully erosion, to identify the most susceptible watersheds within large areas, and to compare the susceptibility to gully erosion among different catchments. This information also can be important to study the response of natural drainage network systems to different rainfall inputs. | J. CASALI L. M. De SANTISTEBAN J. J. LOPEZ J. V. GIRALDEZ J. POESEN J. NACHTERGAELE M. GONI J. LOIZU M. A. CAMPO | 2005 | International Journal of Sediment Research2005，20，4： | 4 |
| 2 | 80年来埃塞俄比亚北部高原土地利用/覆被变化(英文)显示文摘Despite many studies on land degradation in the Highlands of Northern Ethiopia, quantitative information regarding long-term changes in land use/cover(LUC) is rare. Hence, this study aims to investigate the LUC changes in the Geba catchment(5142 km2), Northern Ethiopia, over 80 years(1935–2014). Aerial photographs(APs) of the 1930 s and Google Earth(GE) images(2014) were used. The point-count technique was utilized by overlaying a grid on APs and GE images. The occurrence of cropland, forest, grassland, shrubland, bare land, built-up areas and water body was counted to compute their fractions. A multivariate adaptive regression spline was applied to identify the explanatory factors of LUC and to create fractional maps of LUC. The results indicate significant changes of most types, except for forest and cropland. In the 1930 s, shrubland(48%) was dominant, followed by cropland(39%). The fraction of cropland in 2014(42%) remained approximately the same as in the 1930 s, while shrubland significantly dropped to 37%. Forests shrank further from a meagre 6.3% in the 1930 s to 2.3% in 2014. High overall accuracies(93% and 83%) and strong Kappa coefficients(89% and 72%) for point counts and fractional maps respectively indicate the validity of the techniques used for LUC mapping. | ETEFA Guyassa Amaury FRANKL Sil LANCKRIET BIADGILGN Demissie GEBREYOHANNES Zenebe AMANUEL Zenebe Jean POESEN Jan NYSSEN | 2018 | Journal of Geographical Sciences2018，28，10： | 3 |
| 3 | Gully erosion and environmental change: importance and research needs 显示文摘 | Poesen J Nachtergaele J Verstraeten G | 2003 | Catena2003，50，： | 1 |
| 4 | Effects of rock fragments on physical degradation of cultivated soils by rainfall 显示文摘 | Van Wesemael B Poesen J de Figueiredo T | 1995 | Soil and Tillage Research1995，33，： | 1 |
| 5 | Resistance of soils to concentrated flow erosion:A review显示文摘 | Knapen A Poesen J Govers G | 2007 | Earth-Science Reviews2007，80，： | 1 |
| 6 | Assessment of soil losses by ephemeral gully erosion using high-altitude (stereo) aerial photographs显示文摘 | Nachtergaele J Poesen J | 1999 | Earth Surface Processes and Landforms1999，24，： | 1 |
| 7 | Characteristics and controlling factors of old gullies under forest in a temperate humid climate:a case study from the Meerdaal Forest (Central Belgium)显示文摘 | T Vanwalleghem M Van Den Eeckhaut J Poesen | 2003 | Geomorphology2003，56，： | 1 |
| 8 | Water erosion monitoring and experimentation for global change studies显示文摘 | Poesen J Boardman J Wilcox B | 1996 | Journal of Soil and Water Conservation1996，51，5： | 1 |
| 9 | Gravel mulching in vineyards of sour hem Switzerland显示文摘 | Nachtergaele J Poesen J W Van Wesemael B | 1998 | Soi land Tillage Research1998，46，： | 1 |
| 10 | Gully erosionand environmental change:importance and research needs显示文摘 | Poesen J Nachtergaele J Verstraeten G | 2003 | Catena2003，50，24： | 1 |
| 11 | Spatial distribution of rock fragments in cultivated soils in northern Ethiopia as affected by lateral and vertical displacement processes 显示文摘 | Nyssen J Poesen J | 2002 | Geomorphology2002，43，： | 1 |
| 12 | Medium -term gully headcut retreat rates in Southeast Spain determined from aerial photographs and ground measurements显示文摘 | Vandekerckhove L Poesen J Coven G | 2003 | Catena2003，50，： | 1 |
| 13 | Human impact on the environment in the Ethiopian and Eritrean highlands—a state of the art显示文摘 | Jan Nyssen Jean Poesen Jan Moeyersons Jozef Deckers Mitiku Haile Andreas Lang | 2003 | Earth Science Reviews2003，，3： | 1 |
| 14 | Effects of rock fragments on physical degradation of cultivated soils by rainfall 显示文摘 | Van Wesemael B Poesen J de Figueiredo T | 1995 | Soil and Tillage Research1995，33，： | 1 |
| 15 | Gravel mulching in vineyards of southern Switzerland 显示文摘 | NACHTERGAELE J POESEN J W and VAN WESEMAEL B | 1998 | Soil and Tillage Research1998，46，： | 1 |
| 16 | Rock fragments in top soils:Significance and processes显示文摘 | Poesen J Lavee H | 1994 | Catena1994，23，： | 1 |
| 17 | Effects of rock fragments in- corporated in the soilm a trix on concentrated flow hydraulics and erosion 显示文摘 | Rieke Z D Poesen J Nearing M A | 2007 | Earth Surface Processes Landforms2007，32，7： | 1 |
| 18 | Gully Erosion and Environmental Change:Improtance and Research Needs显示文摘 | Poesen J Nachtergaele J Verstraeten G | 2003 | Catena2003，50，： | 1 |
| 19 | Root character- istics of representative Mediterranean plant species and their erosion-reducing potential during concentrated runoff显示文摘 | de Baets S Poesen J Knapen A | 2007 | Plant and Soil2007，294，1： | 1 |
| 20 | Impact of plant roots on the resistance of soils to erosion by water: a review显示文摘 | Gyssels Gwendolyn Poesen Jean Bochet E | 2005 | Progress in Physical Geography2005，29，2： | 1 |
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