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Browsing by Author "Jovanovic, Nebojsa"

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Agricultural water management: Priorities and challenges (Preface)

Author: Todorovic, M ; Lamaddalena, N ; Jovanovic, Nebojsa ; Pereira, LS Date: Sep 2014 In the past few decades, advances in agricultural research lead to substantial increases in food production (e.g. Green Revolution in Asia and Latin America in the 1980s). However, the question of food security is again high-up on the ... Read more
Alluvial aquifer characterisation and resource assessment of the Molototsi sand river, Limpopo, South Africa

Author: Walker, D ; Jovanovic, Nebojsa ; Bugan, Richard DH ; Abiye, T ; du Preez, D ; Parkin, G ; Gowing, J Date: Oct 2018 Study region: Molototsi sand river, Limpopo, South Africa. Study focus: Ephemeral sand rivers are common throughout the world’s dryland regions, often providing a water source where more conventional sources are unavailable. However, these ... Read more
Application of the rainfall infiltration breakthrough (RIB) model for groundwater recharge estimation in west coastal South Africa

Author: Sun, X ; Xu, Y ; Jovanovic, Nebojsa ; Kapangaziwiri, Evison ; Brendonck, L ; Bugan, Richard DH Date: Apr 2013 Recharge estimation in arid and semi-arid areas is very challenging. The chloride mass balance method applied in western South Africa fails to provide reliable recharge estimates near coastal areas. A relationship between rainfall events and ... Read more
Applying a transdisciplinary process to define a research agenda in a smallholder irrigated farming system in South Africa

Author: Musvoto, Constansia D ; Mason, N ; Jovanovic, Nebojsa ; Froebrich, J ; Tshovhote, J ; Nemakhavhani, M ; Khabe, T Date: Jul 2015 Defining an agenda is critical to a research process, and a transdisciplinary approach is expected to improve relevance of an agenda and resultant research outputs. Given the complexity of farming systems, farmer differences and the involvement ... Read more
Assessing water use by Prosopis invasions and Vachellia karroo trees: Implications for groundwater recovery following alien plant removal in an arid catchment in South Africa

Author: Dzikiti, Sebinasi ; Ntshidi, Zanele ; Le Maitre, David C ; Bugan, Richard DH ; Mazvimavi, D ; Schachtschneider, K ; Jovanovic, Nebojsa ; Pienaar, Harrison H Date: Aug 2017 Prosopis spp., (or Mesquite), is a desert adapted woody weed which has invaded large parts of arid and semi-arid regions. It has a characteristic deep tap root, and forms dense impenetrable thickets along river banks, flood plains, and seasonal ... Read more
Atlantis Water Supply Scheme (AWSS) artificial recharge scientific and operational support

Author: Jovanovic, Nebojsa ; Bugan, Richard DH ; Israel, S ; Petersen, C ; Genthe, Bettina ; Steyn, Maronel ; Tredoux, G ; Allpass, D ; Bishop, R ; Marinus, V ; Flower, P Date: Oct 2012 Since the 1970s, the town of Atlantis, on the dry west coast of South Africa, has relied on an innovative process whereby wastewater and stormwater is transferred underground to be stored in an aquifer for future use. To ensure the long-term ... Read more
Characterization and quantification of preferential flow in fractured rock systems, using resistivity tomography

Author: May, F ; Mikes, D ; Bugan, Richard DH ; Jovanovic, Nebojsa ; Rozanov, A Date: Nov 2010 In the use of unsaturated zone methods to estimate recharge, the basic assumption is made that recharge occurs by means of diffusive processes (i.e. piston flow occurs). In fractured environments the reliability of recharge estimate have been ... Read more
Climate change and agriculture

Author: Todorovic, M ; Jovanovic, Nebojsa Date: Apr 2020 Weather represents day-to-day atmospheric condition (e.g. air temperature, pressure, humidity, precipitation, sunshine hours, cloud cover, wind direction and speed, etc.) over a short term at a given place and time. Climate is defined as the ... Read more
Comparative analysis of the PRMS and J2000 hydrological models applied to the Sandspruit Catchment, Western Cape, South Africa

Author: Bugan, Richard DH ; Jovanovic, Nebojsa ; De Clercq, WP ; Helmschrot, J ; Fluegel, WA ; Leavesley, GH Date: Dec 2009 The applicability of distributed hydrological models to the semi-arid conditions in the Western Cape was investigated through the application of PRMS and J2000 in the Sandspruit Catchment. The Sandspruit is an annual river, with the catchment ... Read more
A comparative analysis of yield gaps and water productivity on smallholder farms in Ethiopia, South Africa and Tunisia

Author: Jovanovic, Nebojsa ; Musvoto, Constansia D ; De Clercq, W ; Pienaar, C ; Petja, B ; Zairi, A ; Hanafi, S ; Ajmi, T ; Mailhol, JC ; Cheviron, B Date: Jan 2018 Agriculture in developing countries will have to transform and increase production by an estimated 70% in order to meet demands by 2050. Although well-managed commercial farms offer little manoeuvring space for increasing agricultural water ... Read more
Comparison of two remote sensing models for estimating evapotranspiration: algorithm evaluation and application in seasonally arid ecosystems in South Africa

Author: Dzikiti, Sebinasi ; Jovanovic, Nebojsa ; Bugan, Richard DH ; Ramoelo, Abel ; Majozi, Nobuhle P ; Nickless, Alecia ; Cho, Moses A ; Le Maitre, David C ; Ntshidi, Zanele ; Pienaar, Harrison H Date: Sep 2019 Remote sensing tools are becoming increasingly important for providing spatial information on water use by different ecosystems. Despite significant advances in remote sensing based evapotranspiration (ET) models in recent years, important ... Read more
Critical review of methods for the estimation of actual evapotranspiration in hydrological models

Author: Jovanovic, Nebojsa ; Israel, S Date: Jan 2012 The chapter is structured in three parts, namely: i) A theoretical overview of evapotranspiration processes, including the principle of atmospheric demand-soil water supply, ii) A review of methods and techniques to measure and estimate actual ... Read more
Discovering the secrets of the Olifants sediments

Author: Petersen, C ; Jovanovic, Nebojsa ; Genthe, Bettina Date: Jul 2012 The polluted Upper Olifants River, in Mpumalanga, has been the focus for many studies in recent years. However, a group of researchers from the CSIR are now also studying an element of the system which has to date been largely overlooked, ... Read more
Dryland salinity management in the semi-arid Western Cape (South Africa)

Author: Bugan, Richard DH ; Jovanovic, Nebojsa ; De Clercq, WP ; Flüge, W-A ; Helmschrot, J ; Fink, M ; Kralisch, S Date: Jul 2011 Dryland salinity is a major factor affecting the water quality of the mid-to-lower-reaches of the Berg River, a pivotal source of water to Cape Town. The implementation of salinity management strategies is therefore essential. Distributed ... Read more
Dryland salinity: threatening water resources in the semi-arid Western Cape

Author: Bugan, Richard DH ; De Clercq, W ; Jovanovic, Nebojsa Date: Nov 2010 Increased dryland salinity in the Swartland and Overberg regions poses a threat to the bread basket of the Western Cape, water resources in an already water-stressed area, water supply to the industrialised Saldanha region as well as the ... Read more
Dynamics of MODIS evapotranspiration in South Africa

Author: Jovanovic, Nebojsa ; Mu, Q ; Bugan, Richard DH ; Zhao, M Date: Jan 2015 This paper describes the dynamics of evapotranspiration (ET) in South Africa using MOD16 ET satellite-derived data, and analyses the inter-dependency of variables used in the ET algorithm of Mu et al. (2011). Annual evapotranspiration is ... Read more
The effectiveness of riparian zones in mitigating water quality impacts in an agriculturally dominated river system in South Africa

Author: Petersen, Chantel R ; Jovanovic, Nebojsa ; Grenfell, MC Date: Jun 2020 This study evaluates relationships between contrasting land uses representing an anthropogenic impact gradient in a coastal agricultural catchment, and riparian vegetation, as reflected in changes in nutrient dynamics and water quality. The ... Read more
Effects of land use change on streamflow and stream water quality of a coastal catchment

Author: Petersen, Chantel R ; Jovanovic, Nebojsa ; Le Maitre, David C ; Grenfell, MC Date: Jan 2017 This study aimed to link land cover/use change to water quality in an important water supply coastal catchment. The approach followed a spatial and temporal analysis of historical catchment land use change to assess how changes influenced ... Read more
Ephemeral sand river flow detection using satellite optical remote sensing

Author: Walker, D ; Smigaj, M ; Jovanovic, Nebojsa Date: May 2019 Ephemeral sand rivers are common throughout the world's dryland regions, often providing a water source where alternatives are unavailable. Alluvial aquifer recharge results from rare surface water flows. Assessment of surface flow frequency ... Read more
Estimating crop coefficients for apple orchards with varying canopy cover using measured data from twelve orchards in the Western Cape Province, South Africa

Author: Mobe, Nompumelelo T ; Dzikiti, Sebinasi ; Zirebwa, SF ; Midgley, SJF ; Von Loeper, W ; Mazvimavi, D ; Ntshidi, Zanele ; Jovanovic, Nebojsa Date: Apr 2020 The FAO-56 crop coefficient (Kc) approach is widely used for making irrigation decisions. Allen and Pereira (2009) extended this approach by developing a method for estimating Kc using a density coefficient (Kd), which is estimated from the ... Read more

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