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Lower Kuiseb River sediments and their control on dust emission
Includes bibliographical references.
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| Main Author: | |
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| Other Authors: | |
| Format: | Thesis |
| Language: | English |
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Department of Environmental and Geographical Science
2015
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| _version_ | 1867613267188252673 |
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| access_status_str | Open Access |
| author | Von Holdt, Johanna RC |
| author2 | Eckardt, Frank |
| author_browse | Eckardt, Frank Von Holdt, Johanna RC |
| author_facet | Eckardt, Frank Von Holdt, Johanna RC |
| author_sort | Von Holdt, Johanna RC |
| collection | Thesis |
| description | Includes bibliographical references. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/12755 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:33:25.185Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2015 |
| publishDateRange | 2015 |
| publishDateSort | 2015 |
| publisher | Department of Environmental and Geographical Science |
| publisherStr | Department of Environmental and Geographical Science |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/12755 Lower Kuiseb River sediments and their control on dust emission Von Holdt, Johanna RC Eckardt, Frank Environmental, Society and Sustainability Includes bibliographical references. Previous studies, using remote sensing, have identified the Kuiseb River in Namibia as the dustiest river in Southern Africa. Dust plumes detected from this basin are mostly associated with the Lower Kuiseb River, between the end of the bedrock canyon at Natab and the Kuiseb Delta towards the Atlantic Ocean. The purpose of this study was to examine the surface materials of the Lower Kuiseb River and establish their potential towards dust production, leading to such plumes. This investigation focused predominantly on the size characteristics of 153 surface sediment samples collected from the Kuiseb main channel, its terraces, delta, gravel plain surfaces and tributaries, dunes and interdune, all of which were analysed using a Malvern Mastersizer 2000 laser diffractometer. In addition, other sediment characteristics such as mineralogy, organic matter content, soluble salts; and selected surface roughness elements were also considered. Furthermore MODIS satellite imagery was used to assess the dust emission activity from each of the geomorphological units sampled in the field for the period from 2005 to 2013. This study has demonstrated surface sediments suitable for dust production to increase towards the coast with particular "dusty" floodplain surfaces between Swartbank and Rooibank, as well as the Kuiseb Delta. It appears that silt crusts formed as the flood water dissipate, provide a main source of appropriately sized material for deflation. The crusts consist entirely of silt and clay sized material, with a maximum of 97% <63μm, 39% <10μm and 6% <μm. Dust producing surfaces of the gravel plain include the gravel plain drainage, which has the largest quantity of clay sized material (maximum of 11% <μm). Anthropogenic disturbances of the surface are likely playing a role in the production of dust, with livestock farming causing a fragmentation of crusts in the river valley, and mining and off-road driving disturbing the gravel plain. 2015-05-06T14:19:53Z 2015-05-06T14:19:53Z 2013 Master Thesis Masters MPhil http://hdl.handle.net/11427/12755 eng application/pdf Department of Environmental and Geographical Science Faculty of Science University of Cape Town |
| spellingShingle | Environmental, Society and Sustainability Von Holdt, Johanna RC Lower Kuiseb River sediments and their control on dust emission |
| thesis_degree_str | Master's |
| title | Lower Kuiseb River sediments and their control on dust emission |
| title_full | Lower Kuiseb River sediments and their control on dust emission |
| title_fullStr | Lower Kuiseb River sediments and their control on dust emission |
| title_full_unstemmed | Lower Kuiseb River sediments and their control on dust emission |
| title_short | Lower Kuiseb River sediments and their control on dust emission |
| title_sort | lower kuiseb river sediments and their control on dust emission |
| topic | Environmental, Society and Sustainability |
| url | http://hdl.handle.net/11427/12755 |
| work_keys_str_mv | AT vonholdtjohannarc lowerkuisebriversedimentsandtheircontrolondustemission |