You are not currently logged in.
Access your personal account or get JSTOR access through your library or other institution:
If You Use a Screen ReaderThis content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Flood-Plain Sedimentation in the Upper Axe Valley, Mendip, England
Mark G. Macklin
Transactions of the Institute of British Geographers
Vol. 10, No. 2 (1985), pp. 235-244
Stable URL: http://www.jstor.org/stable/621826
Page Count: 10
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Preview not available
The River Axe is a groundwater-fed stream whose catchment has experienced metal mining in the past. Its channel activity rates are low and recent alluviation appears to have occurred by overbank deposition of fine-grained sediment. The influence of mining on flood-plain sedimentation over a period of nearly 300 years is examined through the analysis of sediment heavy metal chemistry. The most recent phase of mining (1858-1908) is particularly well-documented and provides an excellent opportunity to first, assess the impact of a dated pulse of 'labelled' sediment on flood-plain deposition, and secondly, to evaluate the use of heavy metal chemistry for indirectly dating alluvial sediments. 'Dating' of fine flood-plain sediments by means of their contained heavy metals permits not only the elucidation of the sequence and pattern of valley alluviation, but also 'quantitative' estimates of rates of flood-plain sedimentation for the last 300 years. Metal mining accelerated fine sediment yields with flood-plain sedimentation rates ranging from 8·8--16·0 mm a-1 when the Priddy minery was in operation, compared to 2·4--4·6 mm a-1 when mining activity ceased.
Transactions of the Institute of British Geographers © 1985 The Royal Geographical Society (with the Institute of British Geographers)