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Holocene sea-level change and coastal evolution in the Humber estuary, eastern England: an assessment of rapid coastal change
A. J. Long
J. B. Innes
Environmental Research Centre, Department of Geography, University of Durham, Science Site, South Road, Durham DHI 3LE, UK
J. R. Kirby
Department of Geography, University of Hull, Hull HU6 7RX, UK
J. M. Lloyd
M. M. Rutherford
I. Shennan
Environmental Research Centre, Department of Geography, University of Durham, Science Site, South Road, Durham DHI 3LE, UK
M. J. Tooley
School of Geography and Geology, University of St Andrews, St Andrews KY16 9ST, Scotland, UK
New stratigraphic data collected from six sites in the Humber estuary establish a record of Holocene relative sea-level (RSL) change, and enable testing of four possible causes of rapid coastal change: sea-level rise, changes in sedimentation, storm-surge history, and human impact. Mean high water of spring tides (MHWST) in the Humber rose from c. 9 m OD at 7500 cal. yrs BP to 0 m OD by 4000 cal. yrs BP, at an average long-term rate of c. 3.9 mm yr-1. After this, the rate of rise gradually decreased to c. 1 mm yr’. Discrete episodes of rapid RSL rise are not identified although their absence may reflect limited data availability. However, we do observe two episodes of rapid coastal change in the Humber estuary. The first occurs between c. 3200 and 1900 cal. yrs BP, as marine conditions expand to their Holocene maximum and then contract. This pattern of coastal development differs from that in the East Anglian Fenlands, suggesting local processes control sedimentation at one or both of these sites. The second period of rapid change relates to a well-documented episode of increased storm surge activity in the Humber estuary and elsewhere in the UK and the North Sea region between c. 700 and 500 cal. yrs BP. Coastal development during this period varies considerably with erosion, accretion and flooding in different parts of the estuary system. Finally, we examine evidence for accelerated sediment delivery to the Humber estuary due to woodland clearance and prehistoric agriculture from 5700 cal. yrs BP onwards. Maximum sediment input is likely at c. 3200 to 1900 cal. yrs BP; a period which tentatively correlates with an episode of estuary infilling and shoreline advance.
Key Words: Sea-level change • sediment supply • storms • human impact • vegetation history • pollen • diatoms • Holocene
The Holocene, Vol. 8, No. 2,
229-247 (1998)
DOI: 10.1191/095968398677984183
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