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191.
Which catchment characteristics control the temporal dependence structure of daily river flows?
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Andrew Chiverton Jamie Hannaford Ian Holman Ron Corstanje Christel Prudhomme John Bloomfield Tim M. Hess 《水文研究》2015,29(6):1353-1369
Hydrological classification systems seek to provide information about the dominant processes in the catchment to enable information to be transferred between catchments. Currently, there is no widely agreed‐upon system for classifying river catchments. This paper develops a novel approach to classifying catchments based on the temporal dependence structure of daily mean river flow time series, applied to 116 near‐natural ‘benchmark’ catchments in the UK. The classification system is validated using 49 independent catchments. Temporal dependence in river flow data is driven by the flow pathways, connectivity and storage within the catchment and can thus be used to assess the influence catchment characteristics have on moderating the precipitation‐to‐flow relationship. Semi‐variograms were computed for the 116 benchmark catchments to provide a robust and efficient way of characterising temporal dependence. Cluster analysis was performed on the semi‐variograms, resulting in four distinct clusters. The influence of a wide range of catchment characteristics on the semi‐variogram shape was investigated, including: elevation, land cover, physiographic characteristics, soil type and geology. Geology, depth to gleyed layer in soils, slope of the catchment and the percentage of arable land were significantly different between the clusters. These characteristics drive the temporal dependence structure by influencing the rate at which water moves through the catchment and/or the storage in the catchment. Quadratic discriminant analysis was used to show that a model with five catchment characteristics is able to predict the temporal dependence structure for un‐gauged catchments. This method could form the basis for future regionalisation strategies, as a way of transferring information on the precipitation‐to‐flow relationship between gauged and un‐gauged catchments. © 2014 The Authors. Hydrological Processes by published by John Wiley & Sons, Ltd. 相似文献
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Eugene JAROSEWICH Ron GOOLEY John HUSLER 《Geostandards and Geoanalytical Research》1987,11(2):197-198
A microprobe reference sample was made from a portion of a large and homogeneous single crystal of augite which contains 0.85% of Cr2 O3 . The relatively high chromium content of this augite increases its usefulness as a microprobe reference sample. 相似文献
195.
Contemporary fiddling in human geography while Rome burns: has quantitative analysis been largely abandoned--and should it be? 总被引:2,自引:0,他引:2
Chris Hamnett [Geoforum 34 (2003) 1] has certainly been provocative in his claim that the nature of much contemporary human geography means that the discipline ‘will cease to be taken seriously in the world beyond the narrow confines of academe’ (p. 1). Much of his critique focuses on what he terms ‘post-modernism, new cultural geography and the interpretative turn’ (p. 2) practiced by those he identifies as ‘the new intellectual dilettanti’ (p. 3). In responding, however, our concern is not with that aspect of his critique, but rather with Hamnett’s misrepresentation of one section of contemporary human geography. 相似文献