DOI: 10.1016/j.earscirev.2019.102972
论文题名: Landslide mobilization rates: A global analysis and model
作者: Broeckx J. ; Rossi M. ; Lijnen K. ; Campforts B. ; Poesen J. ; Vanmaercke M.
刊名: Earth Science Reviews
ISSN: 00128252
出版年: 2020
卷: 201 语种: 英语
中文关键词: Empirical model
; Global dataset
; Landslide mobilization
; Lithology
; Local relief
; Mass movement
; Sediment yield
; Seismicity
英文关键词: data set
; empirical analysis
; hillslope
; landscape evolution
; landslide
; lithology
; mass movement
; relief
; sediment yield
; seismicity
; slope dynamics
; slope failure
; uncertainty analysis
; Himalayas
; Karakoram
英文摘要: Landslides are a main driver of landscape evolution and a dominant sediment source in many regions worldwide. Nevertheless, their role in sediment mobilization and denudation remains poorly quantified, especially at the global scale. Based on an extensive literature review, we compiled measured contemporary landslide mobilization rates (i.e. the average annual volume of hillslope material displaced per unit area; LMR, [m³/km²/y]) from 116 study areas worldwide. Using this dataset, we calibrated and validated a multiple regression model that simulates global patterns of LMR at decadal timescales. This model explains about 62% of the observed variance in LMR based on topography, seismicity and lithology. By applying this model at the global scale and accounting for uncertainties due to observation and prediction errors, we estimate that annually about 56 billion m³ (∼100 gigaton) is mobilized by landslides worldwide. Intercontinental and interregional differences are large with Asia accounting for 68% (38 billion m³) of the global LMR. The Central and Southeast Asian mountain ranges (including the Himalaya and Karakoram) account for 50% (28 billion m³) of this rate, while covering only 2% of the Earth's terrestrial surface. Comparisons of our simulated LMR with other data and models from literature suggest that, in highly tectonically active regions, around 70% of the mobilized landslide volumes are due to earthquake-triggered landslides. At the global scale, the contribution of coseismic landsliding to the total landslide mobilization rate is likely in the order of 30–40%. Using available databases of measured catchment sediment yield (SY), we also conducted a statistical comparison between measured SY and estimated LMR for nearly 3000 catchments in Europe and Africa. We observe highly significant relationships between LMR and SY for Europe (R²: 0.35, p < 0.001) and Africa (R²: 0.2, p < 0.001). Furthermore, landslide mobilization rates are typically larger than the corresponding SY. Overall, this study provides a first estimation of the global patterns of LMR. The results confirm the importance of landsliding as a dominant process of landscape denudation and sediment mobilization, but also illustrate the huge regional variations that characterize this process as well as the importance of sediment dynamics within catchments. © 2019 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/166018
Appears in Collections: 气候变化与战略
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作者单位: Department of Earth and Environmental Sciences, KU Leuven, Celestijnenlaan 200E, Heverlee, 3001, Belgium; CNR IRPI, Via Della Madonna Alta 126, Perugia, 06128, Italy; Research Foundation Flanders (FWO), Egmontstraat 5, Brussels, 1000, Belgium; Université de Liège, Département de Géographie, Clos Mercator 3, Liège, 4000, Belgium
Recommended Citation:
Broeckx J.,Rossi M.,Lijnen K.,et al. Landslide mobilization rates: A global analysis and model[J]. Earth Science Reviews,2020-01-01,201