โ Scribed by David M. Hannah; Barnaby P. G. Smith; Angela M. Gurnell; Glenn R. McGregor
No coin nor oath required. For personal study only.
The stream hydrograph is an integration of spatial and temporal variations in water input, storage and transfer processes within a catchment. For glacier basins in particular, inferences concerning catchment-scale processes have been developed from the varying form and magnitude of the diurnal hydrograph in the proglacial river. To date, however, such classiยฎcations of proglacial diurnal hydrographs have developed in a relatively subjective manner. This paper develops an objective approach to the classiยฎcation of diurnal discharge hydrograph shape' and magnitude' using a combination of principal components analysis and cluster analysis applied to proglacial discharge time-series and to diurnal bulk ยฏow indices. The procedure is applied to discharge timeseries from two dierent glacier basins and four separate ablation seasons representing a gradient of increasing hydrological perturbation as a result of (i) variable water inputs generated by rainstorm activity and (ii) variable location and response of hydrological stores through a systematic decrease in catchment glacierized area. The potential of the technique for application in non-glacial hydrological contexts is discussed.
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