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Flood alluviation and entrenchment; Holocene valley-floor development and transformation in the British uplands

Mark G. Macklin, Barbara T. Rumsby and Tim Heap
Flood alluviation and entrenchment; Holocene valley-floor development and transformation in the British uplands
Geological Society of America Bulletin (June 1992) 104 (6): 631-643

Abstract

The morphology, sedimentary properties, and sequence of recent coarse-grained flood deposits and earlier Holocene alluvial fills were investigated in Thinhope Burn, a small (12-km (super 2) ) catchment in the Northern Pennine uplands, northern England. Twenty-one large flood events are recorded by distinctive cobble-boulder bars, sheets and splays, and boulder berms and lobes. Lichenometric analysis showed that all but one of these floods dated from the mid-eighteenth century. The timing of large floods between 1766 and 1960 corresponds with major hydroclimatic trends evident in northern Britain and northwest Europe over this period. Discharge estimates suggest that flood magnitudes have decreased since the mid-eighteenth century. Channel and flood-plain metamorphosis in late Roman times and in the eighteenth century, following major valley-floor entrenchment (locally as much as 8 m), would appear to have been caused by increased runoff and flood magnitude. This was linked to a shift to a wetter climate with flow augmented by Iron Age and Roman woodland clearance, and drainage of the catchment in more recent times. Results from this study suggest that current models of longer-term Holocene and Pleistocene valley-floor development in the British uplands may need to be re-evaluated.


ISSN: 0016-7606
EISSN: 1943-2674
Coden: BUGMAF
Serial Title: Geological Society of America Bulletin
Serial Volume: 104
Serial Issue: 6
Title: Flood alluviation and entrenchment; Holocene valley-floor development and transformation in the British uplands
Affiliation: Univ. Newcastle upon Tyne, Dep. Geogr., Newcastle upon Tyne, United Kingdom
Pages: 631-643
Published: 199206
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 73
Accession Number: 1992-021845
Categories: Geomorphology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables, sects., sketch maps
N54°52'00" - N54°53'60", W02°30'00" - W02°21'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute.
Update Code: 1992
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