Show simple item record

dc.contributor.authorMather, Aen
dc.contributor.authorStokes, Men
dc.date.accessioned2016-11-03T14:44:17Z
dc.date.accessioned2016-11-03T14:50:11Z
dc.date.issued2016-08-30en
dc.identifier.issn0197-9337en
dc.identifier.urihttp://hdl.handle.net/10026.1/6672
dc.description.abstract

Field based palaeoflood event reconstruction has the potential to contribute to the development of our understanding of longterm landscape evolution. However the reconstruction of past flow event histories (magnitude and frequency) over long-term (Quaternary) timescales is fraught with difficulties. Here we make a preliminary exploration of some of the practicalities of flood reconstruction from fluvial terrace archives using commonly available sedimentological and geomorphological observations from a field perspective. We utilize Manning and palaeostage indicators to reconstruct historic events that can be used as benchmarks for a lesser used competence based approach (Clarke 1996), which is applied to coarse-grained strath terrace deposits. We evaluate the results against gauged records for extreme and catastrophic events that affected the same region in 1973 and 2012. The findings suggest that the competence approach is most effectively applied to terrace deposits if the channel geometry is taken into account when sampling both in cross section and in longitudinal section and calibrated against the sedimentology for palaeo-flow depth. Problems can arise where constrictive channel geometries allow boulder jams to develop, acting as sediment traps for the coarsest material and leading to downstream ‘boulder starvation’. Useful sites to target for palaeoflood reconstruction, therefore, would be upstream of such constrictive reaches where the coarsest transportable bedload has been effectively trapped. Sites to avoid would be downflow, where the deposited material would poorly represent palaeoflood competence. Underestimation from maximum boulder preservation and limited section exposure issues would appear to outweigh possible overestimation concerns related to fluid density and unsteady flow characteristics such as instantaneous acceleration forces. Flood data derived from river terrace deposits suggests that basal terrace geometries and coarse boulder lags common to many terrace sequences are likely the result of extreme flow events which are subsequently filled by lesser magnitude flood events, in this environmental setting.

en
dc.format.extent1991 - 2004en
dc.language.isoenen
dc.publisherWileyen
dc.relation.replaceshttp://hdl.handle.net/10026.1/6671
dc.relation.replaces10026.1/6671
dc.subjectpalaeohydrologyen
dc.subjectpalaeoflooden
dc.subjectriver terraceen
dc.subjectSE Spainen
dc.subjecthyper concentrated flowsen
dc.titleExtracting palaeoflood data from coarse-grained Pleistocene river terrace archives: an example from SE Spainen
dc.typeJournal Article
plymouth.issue13en
plymouth.volume41en
plymouth.publication-statusPublisheden
plymouth.journalEarth Surface Processes and Landformsen
dc.identifier.doi10.1002/esp.4001en
plymouth.organisational-group/Plymouth
plymouth.organisational-group/Plymouth/00 Groups by role
plymouth.organisational-group/Plymouth/00 Groups by role/Academics
plymouth.organisational-group/Plymouth/Faculty of Science and Engineering
plymouth.organisational-group/Plymouth/Faculty of Science and Engineering/School of Geography, Earth and Environmental Sciences
plymouth.organisational-group/Plymouth/REF 2021 Researchers by UoA
plymouth.organisational-group/Plymouth/REF 2021 Researchers by UoA/UoA07 Earth Systems and Environmental Sciences
plymouth.organisational-group/Plymouth/REF 2021 Researchers by UoA/UoA14 Geography and Environmental Studies
plymouth.organisational-group/Plymouth/Research Groups
plymouth.organisational-group/Plymouth/Research Groups/Centre for Research in Environment and Society (CeRES)
plymouth.organisational-group/Plymouth/Research Groups/Marine Institute
dcterms.dateAccepted2016-07-12en
dc.rights.embargodate2017-08-30en
dc.identifier.eissn1096-9837en
dc.rights.embargoperiod12 monthsen
rioxxterms.versionofrecord10.1002/esp.4001en
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/under-embargo-all-rights-reserveden
rioxxterms.licenseref.startdate2016-08-30en
rioxxterms.typeJournal Article/Reviewen


Files in this item

Thumbnail
Thumbnail

This item appears in the following Collection(s)

Show simple item record


All items in PEARL are protected by copyright law.
Author manuscripts deposited to comply with open access mandates are made available in accordance with publisher policies. Please cite only the published version using the details provided on the item record or document. In the absence of an open licence (e.g. Creative Commons), permissions for further reuse of content should be sought from the publisher or author.
Theme by 
@mire NV