David William Hedding
I am a geomorphologist who focuses on understanding landforms and landscape processes in periglacial environments, primarily in the sub-Antarctic and Antarctic. My research has also incorporated studies on weathering processes (rock decay) and I am in the process of setting up a weathering simulation laboratory at the University of South Africa Science Campus, Florida, in which I hope to conduct research on predominantly mechanical weathering processes. On sub-Antarctic Marion Island, I have recently started to investigate aeolian (wind-driven) processes and landforms. I am also investigating the use of terrestrial cosmogenic nuclide dating of glacially-eroded surfaces and glacial deposits and seafloor mapping to develop a geochronology of the glaciation of sub-Antarctic Marion Island since the Last Glacial Maximum. On Round Island, near Mauritius in the Indian Ocean, I am part of a team of researchers who are investigating the interplay between rainfall erosivity and the erodibility of soils and rock on the island. Finally, I have obtained a C2 rating from the South African National Research Foundation and am Associate Professor in the Department of Geography at the University of South Africa in which I teach undergraduate modules on physical geography, environmental science and environmental awareness and responsibility.
1- Hedding, D., 2016. Pronival Ramparts: Origin and development of terminology. Erkunde, vol. 70 (2): 141-151.
Pronival ramparts are debris ridges formed at the downslope margins of perennial or semi-permanent snowbeds
at the foot of bedrock cliffs. The close spatial proximity and morphological similarities of pronival ramparts to modified talus sheets and cones as well as protalus rock glaciers, moraines and landslides has led to difficulties in correctly identifying ramparts. Nevertheless, these landforms have been documented across the globe and, as a result, terms have been developed in different languages. However, the use and meaning of rampart terminology, particularly across several languages, are not consistent. This paper chronicles the origin of the term ‘pronival rampart’ and assesses its use in English language literature and exposes readers to terms from other languages and how their use may differ. Lastly, this paper highlights that, since the meaning of terms denoting pronival ramparts varies between languages, readers should be cognisant of the meaning of the term in a respective language as this may have implications for how pronival ramparts are identified in the context of talus-derived landforms. The paper also discusses whether ramparts are part of a non-developmental or developmental morphological continuum of talus-derived landforms.
2- Rudolph, E.M.; Meiklejohn, K.I., Hansen, C.D.; Hedding, D.W. and Nel, W., 2018. Rock glaciers in the Jutulsessen, Dronning Maud Land, East Antarctica. Polish Polar Research, vol. 39 (1): 1-17. DESCARGAR