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The Noon Hill Flash Floods; July 17th 1983. Hydrological and Geomorphological Aspects of a Major Formative Event in an Upland Landscape

P. A. Carling
Transactions of the Institute of British Geographers
Vol. 11, No. 1 (1986), pp. 105-118
DOI: 10.2307/622074
Stable URL: http://www.jstor.org/stable/622074
Page Count: 14
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The Noon Hill Flash Floods; July 17th 1983. Hydrological and Geomorphological Aspects of a Major Formative Event in an Upland Landscape
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Abstract

The meteorological conditions, pertaining to thunderstorm activity over the north Pennines, which resulted in a major flash-flood are described briefly. The magnitudes of the peak flood discharges generated in three small headwater catchments are estimated using a combination of the slope-area method, culvert geometry, a modified Manning's equation and boulder transport criteria. The return intervals for the rainfall intensity and the channel discharges are calculated. The main geomorphological features associated with the flood flows are described. Values of peak shear stress associated with valley sections are estimated and values of the energy expenditure per unit catchment area are proposed. These latter values pertain to thresholds for the generation of apparently 'unique' landscape features which may be diagnostic of similar formative events in the Pennine uplands. The calculated return period for the rainfall intensity and an estimation of the probable recovery period are used to discuss the sensitivity of the Pennine upland landscape to modification by rare high-magnitude events. Conclusions are drawn as to the role of catastrophic non-uniformitarian precepts in models of upland landscape formation.

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