ELSEVIER Geomorphology20 (1997) 209-218 Editorial R.B. Bryan ~, J.A.A. Jones b,, a Soil Erosion Laboratory, University ofToromo, Scarborough, Ont. M1C IA4, Canada b University of Wales, Institute of Earth Studies, Aberystwyth S¥23 3DB, UK The transfer of sediment from hillslope to river channel has been a topic of central importance in geomorphology since the earliest origins of the discipline. For many years it appeared that this was overwhelmingly dormnated by mass wasting or by transport in overland :flow. This view was reinforced by many geomorphologists but was particularly enhanced by R.E. Horton's work, which culminated in his pivotal paper on the development of drainage basins (Horton, 1945). The importance of surface flow erosion processes was supported by numerous field and experimental studies, many on dryland hillslopes or disturbed agricultural soils, where Hortonian overland flow is comparatively frequent. There were early reports of significant erosion by subsurface flow in nonkarstic areas (e.g. Bryan, 1919; Bond, 1941; Gibbs, 1945; Cockfield and Buckham, 1946; Fletcher and Carroll, 1948; Buckham and Cockfield, 1950), bwL in general subsurface erosion was regarded as a process of limited importance confined to certain materials, particularly in dryland regions. During the 1960s and 1970s, increasing evidence of
Geomorphology – Elsevier
Published: Oct 1, 1997
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