DOI: 10.5194/hess-21-4525-2017
Scopus记录号: 2-s2.0-85027966559
论文题名: Impact of rainfall spatial aggregation on the identification of debris flow occurrence thresholds
作者: Marra F ; , Destro E ; , Nikolopoulos E ; I ; , Zoccatelli D ; , Dominique Creutin J ; , Guzzetti F ; , Borga M
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2017
卷: 21, 期: 9 起始页码: 4525
结束页码: 4532
语种: 英语
Scopus关键词: Debris
; Gages
; Precipitation (meteorology)
; Rain gages
; Remote sensing
; Debris flow occurrences
; Different densities
; Fine resolution
; Rain gauge networks
; Spatial aggregation
; Spatial organization
; Spatial resolution
; Systematic variation
; Rain
; debris flow
; early warning system
; identification method
; precipitation intensity
; radar
; rainfall
; raingauge
; remote sensing
; spatial analysis
; threshold
; Alps
; Italy
英文摘要: The systematic underestimation observed in debris flow early warning thresholds has been associated with the use of sparse rain gauge networks to represent highly non-stationary rainfall fields. Remote sensing products permit concurrent estimates of debris-flow-triggering rainfall for areas poorly covered by rain gauges, but the impact of using coarse spatial resolutions to represent such rainfall fields is still to be assessed. This study uses fine-resolution radar data for ĝ1/4 100 debris flows in the eastern Italian Alps to (i) quantify the effect of spatial aggregation (1–20ĝ€km grid size) on the estimation of debris-flow-triggering rainfall and on the identification of early warning thresholds and (ii) compare thresholds derived from aggregated estimates and rain gauge networks of different densities. The impact of spatial aggregation is influenced by the spatial organization of rainfall and by its dependence on the severity of the triggering rainfall. Thresholds from aggregated estimates show 8–21ĝ€% variation in the parameters whereas 10–25ĝ€% systematic variation results from the use of rain gauge networks, even for densities as high as 1ĝ•10ĝ€kmĝ'2. © Author(s) 2017. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/79063
Appears in Collections: 气候变化事实与影响
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作者单位: Institute of Earth Sciences, Hebrew University of Jerusalem, Jerusalem, Israel; Department of Land, Environment, Agriculture and Forestry, University of Padova, Padua, Italy; Department of Civil and Environmental Engineering, University of Connecticut, Storrs, CT, United States; Institut des Géosciences pour l'Environnement, Université de Grenoble Alpes/CNRS, Grenoble, France; Istituto di Ricerca per la Protezione Idrogeologica, Consiglio Nazionale Delle Ricerche, Perugia, Italy
Recommended Citation:
Marra F,, Destro E,, Nikolopoulos E,et al. Impact of rainfall spatial aggregation on the identification of debris flow occurrence thresholds[J]. Hydrology and Earth System Sciences,2017-01-01,21(9)