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Browsing by Author "Ashton, PJ"

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Limnological studies on the Pretoria Salt Pan, a hypersaline maar lake

Author: Ashton, PJ ; Schoeman, FR Date: 1983 The Pretoria Salt pan is shallow and alkaline with pronounced mesothermy at a depth of between 0.55 and 0.7 metres. Secchi disc transparencies ranged from 7 to 19 cm. Endorheic or closed drainage basins are widely distributed in many climate ... Read more
Limnology of hartbeespoort dam

Author: Ashton, PJ ; Chutter, PM ; Cochrane, KL ; De Moor, FC ; Hely-Hutchinson, JR ; Jarvis, AC ; Robarts, RD ; Scott, WE ; Thornton, JA ; Twinch, AJ ; Zohary, T ; Bostock, LB ; Combrink, S ; Fenn, TA ; Grimbeek, LM ; Herbst, HM ; Hills, MJ ; Mitchell, RF ; Pais Madeira, AM ; van Blommestein, SD Date: 1985 Hartbeespoort Dam is a hypertrophic, warm, monomictic impoundment. With a mean depth of 9.6 m and a surface area of 20 km2, the system demonstrates that hypertrophy is not confined to small shallow lakes as concluded by Barica (1981). The ... Read more
Progress and challenges in freshwater conservation planning

Author: Nel, JL ; Roux, DJ ; Abell, R ; Ashton, PJ ; Cowling, RM ; Higgins, JV ; Thieme, M ; Viers, JH Date: Jun 2009 Freshwater ecosystems and their associated biota are among the most endangered in the world. This, combined with escalating human pressure on water resources, demands that urgent measures be taken to conserve freshwater ecosystems and the ... Read more
Responses of phytoplankton upon exposure to a mixture of acid mine drainage and high levels of nutrient pollution in Lake Loskop, South Africa.

Author: Oberholster, Paul J ; Myburgh, JG ; Ashton, PJ ; Botha, AM Date: 2009 The relationships between water quality and the phytoplankton community within Lake Loskop were studied during the late summer and autumn of 2008 to evaluate the impacts of acid mine drainage and high nutrient concentrations. The higher ... Read more
Riverine biodiversity conservation in South Africa: current situation and future prospects

Author: Ashton, PJ Date: Jul 2007 South Africa is richly endowed with an array of natural resources, with one exception - water. In South African water law, a river system and its associated riverine biodiversity - i.e. the entire aquatic ecosystem - is regarded as the ‘water ... Read more
Simplifying dynamic river water quality modelling: A case study of inorganic nitrogen dynamics in the Crocodile River (South Africa).

Author: Deksissa, T ; Meirlaen, J ; Ashton, PJ ; Vanrolleghem, PA Date: Jun 2004 This study aims to develop a simple dynamic river water quality model that can be applicable in a data limited situation and is compatible with typical activated sludge models, so that the model can be used in integrated modelling of wastewater ... Read more
South African research agenda to investigate the potential environmental, health and safety risks of nanotechnology

Author: Musee, N ; Brent, AC ; Ashton, PJ Date: Apr 2010 The South African perspective on nanotechnology, recently articulated through its national strategy, envisages nanotechnology to provide solutions to some of the country’s key development challenges, such as the provision of safe water and ... Read more
South African research in the hydrological sciences: 1999-2002

Author: Hughes, D ; Ashton, PJ ; Gorgens, A ; Jewitt, G ; Schulze, R ; Smithers, J ; Pegram, G ; Dube, R Date: Jul 2003 The principal activities of South African researchers in hydrology and water resources during the reporting period have been concerned with ground- and surface-water interactions, rainfall-runoff modelling, and the establishment of improved ... Read more
Towards co-operative governance in the development and implementation of cross-sectoral policy: water policy as an example

Author: MacKay, HM ; Ashton, PJ Date: Jan 2004 Water, because it is so fundamental and irreplaceable to humans and their activities, is an all pervasive issue that underpins the social fabric of every society. This means that water policy is cross-sectoral, directly and indirectly affecting ... Read more
Trialogue model for ecosystem governance.

Author: Hattingh, J ; Maree, GA ; Ashton, PJ ; Leaner, JJ ; Turton, AR Date: 2007 The International Symposium on Ecosystem Governance held in South Africa during 2005 enabled scientists from several disciplines to debate issues relating to governance. The symposium provided an opportunity to explore the concept of governance, ... Read more

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Browsing by Author "Ashton, PJ"

Browsing by Author "Ashton, PJ"

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