Dynamics of river sediments in forested headwater streams: Plynlimon G. J. L. Leeks and S. D. Marks Institute of Hydrology, Maclean Building, Crowmarsh Gifford, Wallingford, Oxon, OX10 8BB
Abstract. Long term studies of fluvial sediment processes in
the Plynlimon catchments have contributed to the assessment and quantification of plantation forestry impacts in
British upland catchments, at all stages of the forest cycle. The results from the Plynlimon studies
are placed in the context of the observed impacts of particular forest practices and studies of
forestry effects on sediment transport elsewhere in the world. The effects associated with drain
excavation, ploughing, track construction, ground and channel disruption are outlined for both bedload
and, particularly, for suspended load.
Finally, recent data on sediment yields from 1995
to 1997 at Plynlimon are reported and discussed in the light of longer-term sediment yield estimates. This
paper also provides background information relevant to other sediment process studies which
use data from the main Plynlimon sediment monitoring network.
Citation: Leeks, G. J. L. and Marks, S. D.: Dynamics of river sediments in forested headwater streams: Plynlimon, Hydrol. Earth Syst. Sci., 1, 483-497, doi:10.5194/hess-1-483-1997, 1997.