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Browsing by Subject "Evapotranspiration"

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Are simple empirical crop coefficient approaches for determining pecan water use readily transferrable across a wide range of conditions?

Author: Taylor, NJ ; Annandale, JG ; Ibraimo, NA ; Steyn, JM ; Gush, Mark B Date: Feb 2017 planning. However, it is impossible to measure ET under all possible combinations of climate and management practices, which necessitates the use of ET models. Although empirical models are more likely to be adopted by consultants and growers, ... Read more
Citrus water use in South Africa

Author: Vahrmeijer, JT ; Annandale, JG ; Gush, Mark B ; Taylor, NJ Date: Sep 2012 Agriculture, as the largest user of fresh water worldwide, is under close scrutiny to justify its use of water due to the increase in competition from a number of end-users. Apart from on-farm measures to increase water use efficiency, ... Read more
Comparison of water-use by alien invasive pine trees growing in riparian and non-riparian zones in the Western Cape Province, South Africa

Author: Dzikiti, Sebinasi ; Schachtschneider, K ; Naiken, V ; Gush, Mark B ; Le Maitre, David C Date: Apr 2013 Self-established stands of alien invasive pine trees are common in many parts of South Africa and elsewhere. They mainly invade non-riparian settings but sometimes invade riparian habitats. There are clear visual differences in the physical ... 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
Deriving crop coefficients for evergreen and deciduous fruit orchards in South Africa using the fraction of vegetation cover and tree height data

Author: Mashabatu, M ; Ntshidi, Zanele ; Dzikiti, S ; Jovanovic, N ; Dube, T ; Taylor, NJ Date: Aug 2023 Inaccurate crop coefficients are major contributing sources of uncertainty that lead to inefficient use of limited available water resources. Understanding the need to improve water use efficiency in South Africa’s fruit industry, this study ... 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
Estimating evapotranspiration in a semi-arid catchment: A comparison of hydrological modelling and remote-sensing approaches

Author: García, CL ; Jovanovic, Nebojsa ; Teich, I ; Fink, M ; Dzikiti, Sebinasi ; Bugan, Richard DH Date: Apr 2020 Reliable spatial data of evapotranspiration (ET) in support of water resources management are limited. ET is a major component of the water balance, in many regions, and therefore it is critical that it be accurately quantified. To identify ... Read more
Estimating water use of mature pecan orchards: A six stage crop growth curve approach

Author: Ibraimo, NA ; Taylor, NJ ; Steyn, JM ; Gush, Mark B ; Annandale, JG Date: Nov 2016 Mature pecans use large quantities of water and therefore the accurate estimation of water use or evapotranspiration (ET) of pecan orchards is critical for judicious irrigation water management and planning. Measuring ET under all possible ... Read more
Estimation of daily evapotranspiration over Africa using MODIS/Terra and SEVIRI/MSG data

Author: Sun, Z ; Gebremichael, M ; Ardö, J ; Nickless, A ; Caque, B ; Merboldh, L ; Kutschi, W Date: Aug 2012 Most existing remote sensing-based evapotranspiration (ET) algorithms rely exclusively on polar-orbiting satellites with thermal infrared sensors, and therefore the resulting ET values represent only “instantaneous or snapshot” values. However, ... Read more
Groundwater recharge: Accurately representing evapotranspiration

Author: Bugan, Richard DH ; Jovanovic, Nebojsa ; May, F ; Dzikiti, Sebinasi Date: Sep 2011 Groundwater recharge is the basis for accurate estimation of groundwater resources, for determining the modes of water allocation and groundwater resource susceptibility to climate change. Accurate estimations of groundwater recharge with ... Read more
Improving operational land surface model canopy evapotranspiration in Africa using a direct remote sensing approach

Author: Marshall, M ; Tu, K ; Funk, C ; Michaelsen, J ; Williams, P ; Williams, C ; Ardo, J ; Boucher, M ; Cappelaere, B ; De Grandcourt, A ; Nickless, A ; Nouvellon, Y ; Scholes, R ; Kutsch, W Date: Mar 2013 Climate change is expected to have the greatest impact on the world's economically poor. In the Sahel, a climatically sensitive region where rain-fed agriculture is the primary livelihood, expected decreases in water supply will increase food ... Read more
An intercomparison of satellite-based daily evapotranspiration estimates under different eco-climatic regions in South Africa

Author: Majozi, Nobuhle P ; Mannaerts, CM ; Ramoelo, Abel ; Mathieu, Renaud SA ; Mudau, Azwitamisi E ; Verhoef, W Date: Mar 2017 Knowledge of evapotranspiration (ET) is essential for enhancing our understanding of the hydrological cycle, as well as for managing water resources, particularly in semi-arid regions. Remote sensing offers a comprehensive means of monitoring ... Read more
Measurement and modelling of evapotranspiration in three fynbos vegetation types

Author: Dzikiti, Sebinasi ; Jovanovic, Nebojsa ; Bugan, Richard DH ; Israel, S ; Le Maitre, David C Date: Apr 2014 Many studies have investigated the water relations of indigenous plants in the fynbos shrublands of the Cape, South Africa. These have mainly focused on understanding the mechanisms by which individual plant species respond to droughts, the ... Read more
Monitoring of water resources using satellite information: Applications of MOD16 evapotranspiration

Author: Jovanovic, Nebojsa ; Bugan, Richard DH ; Garcia, CL ; Teich, I ; Catalini, C ; Rodriguez, CMG ; Mu, Q ; Zhao, M Date: Sep 2014 The paper describes four years of research on development and testing of evapotranspiration (ET) using MOD16 ET satellite-derived data. A slight decreasing trend in MOD16 ET was observed over the last 13 years in all climatic regions except ... Read more
Quantifying potential water savings from clearing invasive alien Eucalyptus camaldulensis using in situ and high resolution remote sensing data in the Berg River Catchment, Western Cape, South Africa

Author: Dzikiti, Sebinasi ; Gush, Mark B ; Le Maitre, David C ; Maherry, AC ; Jovanovic, Nebojsa ; Ramoelo, Abel ; Cho, Moses A Date: Feb 2016 Eucalyptus camaldulensis (Red River Gum) is an aggressive alien invasive species in South Africa where it forms dense self-established stands mainly along river channels and on flood plains throughout the country. The actual water use by ... Read more
Recent trends in the climate of Namaqualand, a megadiverse arid region of South Africa

Author: Davis, CL ; Hoffman, MT ; Roberts, W Date: Apr 2016 Namaqualand is especially vulnerable to future climate change impacts. Using a high-resolution (0.5°x0.5°) gridded data set (CRU TS 3.1) and individual weather station data, we demonstrated that temperatures as well as frequency of hot extremes ... Read more
Remote sensing of water use and water stress in the African savanna ecosystem at local scale – Development and validation of a monitoring tool

Author: Andreu, A ; Dube, T ; Nieto, H ; Mudau, AE ; González-Dugo, MP ; Guzinski, R ; Hülsmann, S Date: Feb 2019 Savannas are among the most productive biomes of Africa, where they comprise half of its surface. They support wildlife, livestock, rangelands, crops, and livelihoods, playing an important socioeconomic role in rural areas. These water-limited ... Read more
Total evaporation estimates from a Renosterveld and dryland wheat/fallow surface at the Voëlvlei Nature Reserve (South Africa)

Author: Jovanovic, Nebojsa ; Jarmain, C ; De Clercq, WP ; Vermeulen, T ; Fey, MV Date: Oct 2011 Accurate quantification of the water balance, in particular evapotranspiration, is fundamental in managing water resources, especially in semi-arid areas. The objective of this study was to compare evaporation from endemic vegetation in the ... Read more
Validation of global evapotranspiration product (MOD16) using flux tower data in the African savanna, South Africa

Author: Ramoelo, Abel ; Majozi, Nobuhle P ; Mathieu, Renaud SA ; Jovanovic, Nebojsa ; Nickless, A ; Dzikiti, Sebinasi Date: Aug 2014 Globally, water is an important resource required for the survival of human beings. Water is a scarce resource in the semi-arid environments, including South Africa. In South Africa, several studies have quantified evapotranspiration (ET) in ... Read more
The water balance of a seasonal stream in the semi-arid Western Cape (South Africa)

Author: Bugan, Richard DH ; Jovanovic, Nebojsa ; De Clercq, WP Date: Apr 2012 A detailed water balance and conceptual flow model was calculated and developed for the Sandspruit catchment for the period 1990 to 2010 on a winter rainfall water-year (1 April - 31 March) basis. The Sandspruit catchment (quaternary catchment ... Read more

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