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Browsing by Author "Dabrowski, James M"

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Analysis of virtual water flows associated with the trade of maize in the SADC region: importance of scale

Author: Dabrowski, James M ; Masekoameng, E ; Ashton, PJ Date: Oct 2009 The concept of virtual water encourages a country to view agricultural crops in terms of the amount of water required to produce those crops, with a view to implementing trading policies that promote the saving of scarce water resources. ... Read more
Applying SWAT to predict ortho-phosphate loads and trophic status in four reservoirs in the upper Olifants catchment, South Africa

Author: Dabrowski, James M Date: Jul 2014 Excessive phosphate loading in the upper Olifants River, South Africa has resulted in widespread eutrophication and associated ecosystem health impacts. The majority of sewage treatment works (STWs) are operating poorly and are likely an ... Read more
An assessment of the impact of different land use activities on water quality in the upper Olifants River catchment

Author: Dabrowski, James M ; De Klerk, LP Date: Apr 2013 Routine sampling of water quality was conducted at sites along a longitudinal gradient from upstream to downstream in the Olifants River to determine spatial trends in nutrient and metal concentrations and to relate these trends to changes ... Read more
Development and field validation of an indicator to assess the relative mobility and risk of pesticides in the Lourens River catchment, South Africa

Author: Dabrowski, James M ; Balderacchi, M Date: Nov 2013 A GIS based pesticide risk indicator that integrates exposure variables (i.e. pesticide application, geographic, physicochemical and crop data) and toxicity endpoints (using species sensitivity distributions) was developed to estimate the ... Read more
Development of pesticide use maps for South Africa

Author: Dabrowski, James M Date: Jan 2015 Over 3000 pesticides are registered for use in South Africa. Many studies have highlighted the movement of pesticides to agricultural crops from the point of application into non-target environments, particularly surface and groundwater ... Read more
Fate, transport and effects of pollutants originating from acid mine drainage in the Olifants River, South Africa

Author: Dabrowski, JM ; Dabrowski, James M ; Hill, Liesl ; Macmillan, P ; Oberholster, Paul J Date: Aug 2014 Concentrations of pollutants were measured in water, sediment and algal samples collected along a longitudinal gradient from a stretch of the Olifants River, South Africa, that receives acid mine drainage (AMD) from the Klipspruit River. The ... Read more
Impact of temporary desiccation on the mobility of nutrients and metals from sediments of Loskop Reservoir, Olifants River

Author: Dabrowski, J ; Baldwin, DS ; Dabrowski, James M ; Hill, Liesl ; Shadung, Justinus Date: Jan 2017 South Africa is prone to droughts and is heavily dependent on stored water resources. Few studies in South Africa have investigated the impact of drought on water quality when rainfall resumes and reservoir sediments are rewet. Other research ... Read more
Maritime piracy situation modelling with dynamic Bayesian networks

Author: Dabrowski, James M ; De Villiers, Johan P Date: May 2015 A generative model for modelling maritime vessel behaviour is proposed. The model is a novel variant of the dynamic Bayesian network (DBN). The proposed DBN is in the form of a switching linear dynamic system (SLDS) that has been extended ... Read more
Predicting the potential distribution of invasive silver carp Hypophthalmichthys molitrix in South Africa

Author: Lübcker, N ; Zengeya, TA ; Dabrowski, James M ; Robertson, MP Date: 2014 Predicting the potential geographical distribution and spread of non-native species is of major concern to ecologists. Silver carp Hypophthalmichthys molitrix, ranked as one of the world’s 100 worst invasive species, were introduced into South ... Read more
Trends in anthropogenic mercury emissions estimated for South Africa during 2000-2006

Author: Masekoameng, KE ; Leaner, J ; Dabrowski, James M Date: Aug 2010 Recent studies suggest an increase in mercury (Hg) emissions to the global environment, particularly as a result of anthropogenic activities. This has prompted many countries to complete Hg emission inventories, based on country-specific Hg ... Read more
Using modified multiple phosphorus sensitivity indices for mitigation and management of phosphorus loads on a catchment level

Author: Oberholster, Paul J ; Dabrowski, James M ; Botha, A-M Date: Jan 2013 The relationships between river and lake phosphorus sensitivity, environmental drivers and catchment characteristics within the upper Olifants River and Lake Loskop were studied over a period of four years to come up with mitigation and ... Read more
Validation of the AGDISP model for predicting airborne atrazine spray drift: a South African ground application case study

Author: Nsibande, SA ; Dabrowski, James M ; van der Walt, E ; Venter, A ; Forbes, PBC Date: Jun 2015 Air dispersion software models for evaluating pesticide spray drift during application have been developed that can potentially serve as a cheaper convenient alternative to field monitoring campaigns. Such models require validation against ... Read more

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Browsing by Author "Dabrowski, James M"

Browsing by Author "Dabrowski, James M"

Browse

All of ResearchSpace

Quick Links

Legislation and compliance

General Enquiries

Social Connect