A comparison of some methods of slope measurement from large-scale air photos

Turner, Howard M.

doi:10.1016/0031-8663(77)90007-2

Cited by 5 publications

(1 citation statement)

References 3 publications

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“…Of more general interest to slope workers may be Turner's (1977) article on slope angle measurement from aerial photographs, using equipment considerably less sophisticated than first-and second-order plotters, and much less expensive. Based on the premise that most slope studies require an accuracy of about one degree only, and that large scale (i : Sooo) photographs are available, the study compares the findings of ten laboratory methods with absolute values determined by theodolite, and with standard values obtained using an Abney Level.…”

Section: Methods In Slope Investigationsmentioning

confidence: 99%

Slopes and slope processes

Carson

1978

Progress in Physical Geography: Earth and Environment

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Quantity, rather than quality, seems to have dominated the literature dealing with slopes during the last twelve months. The entire third issue of the 1976 volume of Geografiska Annaler, for instance, is a collection of papers on mass-movement prepared by members of the IGU Commission on Present Day Geomorphological Processes; over 200 pages of the Philosophical Transactions of the Royal Society were devoted to a discussion of clay slopes in southern England (Skempton and Hutchinson, 1976); and the second and third issues of Earth Surface Processes were combined as a printed record of papers presented at the 1976 Louvain Conference in Belgium, all. but three of the articles dealing with slope form, materials and processes. To be sure, some of the articles contained in these three publications will interest slope geomorphologists, but there are few truly new and stimulating ideas to be found.The two publications dealing with mass-wasting certainly contrast significantly with each other. When Rapp and Str6mquist (1976, 128) write:Taken together, the eight papers show many examples that mass movements are an important geomorphological agent in our time, and that they can be studied quantitatively, both for a better understanding of landform development and for applications in land use planning one can only hope that civil engineers manage to avoid the journal on library shelves, or simply misread the year of publication. Apart from brevity, there is little of merit in this collection of papers. An exception might be the study by Blong and Dunkerley (1976) in southeastern Australia, and, in particular, their brief consideration of whether or not deforestation increases susceptibility to mass-wasting; the same theme is also discussed elsewhere by Carson and Tam (1977) in relation to a landslide-prone area of Barbados. The Royal Society papers, in contrast, provide a wealth of detailed, valuable field observation for fossil periglacial phenomena in southern England. The paper by Skempton and Weeks (1976) is particularly wellworth reading because of its integrated approach to slope development drawing upon geomorphology, soil mechanics and Quaternary history. In general, however, the cautious reader will probably be wary of some of the speculations regarding shear strength parameters and pore pressures inferred for former tundra times, and the analogous problem of generalizing spatially on the basis of a few thoroughly documented sections. One suspects that significant strides in understanding fossil slope forms must await further study of present-day processes in environments similar to those which prevailed during the past.

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Section: Methods In Slope Investigationsmentioning

confidence: 99%