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Phlip Greenwood published an article in December 2017.
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190 shared publications
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Physical Geography, Department of Geosciences, University of Fribourg, Chemin du Musée 4, 1700 Fribourg, Switzerland
76 shared publications
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(1970 - 2017)
(1970 - 2017)
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Article 1 Read 0 Citations ‘Local gradient’ and between-site variability of erosion rate on badlands in the Karoo, South Africa Published: 22 December 2017
Earth Surface Processes and Landforms, doi: 10.1002/esp.4293
Site-average values of local gradient, defined as the steepest slope angle measured at a point, are a powerful predictor of long-term rates of soil loss as measured by erosion pins on the non-channel floor portions of ten badland study sites in the Karoo area of South Africa. Local gradient may be easily measured using a smartphone clinometer. The successful use of local gradient here is in strong contrast to the previous failure of other site-specific attributes, including other measures of gradient and relief, to explain between-site variation in erosion rate on these study sites.Each measurement of local gradient may be thought of as a sample of the site's microtopography. Microrelief is a strong determinant of the emergent patterns of inter-channel overland flow, and hence of the patterns of inter-channel erosion by flow. Local gradient changes most rapidly during the initial stages of channel incision. When channels are established, local gradient changes more slowly leading to almost-parallel retreat of channel sidewalls.A sensitivity analysis suggests that measurements of local gradient are not all equal with regard to prediction of long-term erosion rate. A greater share of predictive power is contributed by measurements made on very steep or vertical channel side wall areas, and a lesser share is contributed by measurements made on interfluves.
BOOK-CHAPTER 2 Reads 0 Citations A Review of the Radionuclide, Cobalt-60, as a Fine-Sediment Tracer Published: 06 December 2017
Cobalt, doi: 10.5772/intechopen.71304
Article 1 Read 2 Citations Evidence for extreme floods in arid subtropical northwest Australia during the Little Ice Age chronozone (CE 1400–1850) Published: 01 July 2016
Quaternary Science Reviews, doi: 10.1016/j.quascirev.2016.05.004
Article 2 Reads 0 Citations Introduction to the special issue of Geographica Helvetica: "Mapping, measuring and modeling in geomorphology" Published: 15 October 2015
Geographica Helvetica, doi: 10.5194/gh-70-311-2015
Article 1 Read 1 Citation Earth Surface Exchanges (ESEX) Commentary on ‘Plants as river system engineers’ by A. Gurnell. Earth Surface Processes a... Published: 25 November 2014
Earth Surface Processes and Landforms, doi: 10.1002/esp.3672
In a review of the role of plants in river systems, Gurnell (2014) explains how living riparian vegetation can exert physical controls that enable it to modify and manipulate many fluvial processes. Those traits, in combination with their tendency to speed up the recovery of river systems between extreme flow events through their stabilising influence, imply that plants may act as ‘river system engineers’. In this sense, vegetation may be important in attenuating erosion during high flow and stabilising river features both during and after extreme flow conditions. This article is protected by copyright. All rights reserved.
Article 1 Read 14 Citations Does the invasive plant, Impatiens glandulifera, promote soil erosion along the riparian zone? An investigation on a sma... Published: 20 December 2013
Journal of Soils and Sediments, doi: 10.1007/s11368-013-0825-9
The invasive plant, Impatiens glandulifera (common English name: Himalayan Balsam), is now found in many river catchments in most European countries. Its preference for damp, nutrient-rich soils, along with its intolerance to cold weather and rapid dieback, has implicated it in promoting soil erosion along the riparian zone. Despite the implication, its influence on the sediment dynamics of river systems remains unconfirmed. This communication reports the preliminary findings of ongoing work to investigate a possible link between I. glandulifera and accelerated erosion rates in inland river systems.