globalchange  > 气候变化事实与影响
DOI: 10.5194/hess-19-91-2015
Scopus记录号: 2-s2.0-84920748065
论文题名:
High-resolution global topographic index values for use in large-scale hydrological modelling
作者: Marthews T; R; , Dadson S; J; , Lehner B; , Abele S; , Gedney N
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2015
卷: 19, 期:1
起始页码: 91
结束页码: 104
语种: 英语
Scopus关键词: Flow of water ; Groundwater ; Hydrology ; Runoff ; Solute transport ; Surface measurement ; Surface waters ; Compound topographic indices ; Hydrological modeling ; Hydrological modelling ; Land surface fluxes ; Land surface modelling ; Land surface models ; Spatial variability ; Water table dynamics ; Catchments ; algorithm ; catchment ; data set ; hydrological modeling ; land surface ; numerical model ; pixel ; topography ; water flow ; water table ; Australia ; Murray-Darling Basin ; Saint Lawrence Basin
英文摘要: Modelling land surface water flow is of critical importance for simulating land surface fluxes, predicting runoff and water table dynamics and for many other applications of Land Surface Models. Many approaches are based on the popular hydrology model TOPMODEL (TOPography-based hydrological MODEL), and the most important parameter of this model is the well-known topographic index. Here we present new, high-resolution parameter maps of the topographic index for all ice-free land pixels calculated from hydrologically conditioned HydroSHEDS (Hydrological data and maps based on SHuttle Elevation Derivatives at multiple Scales) data using the GA2 algorithm (GRIDATB 2). At 15 arcsec resolution, these layers are 4 times finer than the resolution of the previously best-available topographic index layers, the compound topographic index of HYDRO1k (CTI). For the largest river catchments occurring on each continent we found that, in comparison with CTI our revised values were up to 20% lower in, e.g. the Amazon. We found the highest catchment means were for the Murray-Darling and Nelson-Saskatchewan rather than for the Amazon and St. Lawrence as found from the CTI. For the majority of large catchments, however, the spread of our new GA2 index values is very similar to those of CTI, yet with more spatial variability apparent at fine scale. We believe these new index layers represent greatly improved global-scale topographic index values and hope that they will be widely used in land surface modelling applications in the future. © 2015 Author(s).
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78650
Appears in Collections:气候变化事实与影响

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作者单位: School of Geography and the Environment, University of Oxford, Oxford, United Kingdom; Department of Geography, McGill University, Montreal, QC, Canada; Met. Office, Hadley Centre for Climate Prediction and Research (JCHMR), Wallingford, United Kingdom

Recommended Citation:
Marthews T,R,, Dadson S,et al. High-resolution global topographic index values for use in large-scale hydrological modelling[J]. Hydrology and Earth System Sciences,2015-01-01,19(1)
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