Adriaan Johannes Van der Walt

University of the Free State | ufs · Department of Geography

The sixth Assessment of the Intergovernmental Panel on Climate Change projects increasing thermal‐associated morbidity and mortality under anthropogenically‐induced warming. Over 100 indices exist to quantify thermal stress, and among these, the Universal Thermal Climate Index (UTCI) was developed for regional investigations of thermal stress influ...

Over data-sparse regions such as southern Africa, reanalysis products represent valuable proxies for observed weather data. These products are, however, associated with a range of strengths and weaknesses which cannot be overlooked. Hence, for the period 1979–2021, we explored the performance of three ERA5-based reanalysis products (i.e. AgERA5, ER...

Urban land use and land cover (LULC) change can be efficiently monitored with high-resolution satellite products for a variety of purposes, including sustainable planning. These, together with machine learning strategies, have great potential to detect even subtle changes with satisfactory accuracy. In this study, we used PlaneScope Imagery and mac...

Extreme Temperature Events (ETEs), including heatwaves, warm spells, cold waves and cold spells, have disastrous impacts on human health and ecosystems. The frequency, intensity, and duration of ETEs is projected to increase due to climate change. However, very little research has been done on ETEs in South Africa, and only a few attempts have been...

Extreme cold events ('cold waves’) have disastrous impacts on ecosystem and human health. Evidence shows that these events will still occur under current increasing mean temperatures. Little research has been done on extreme cold events, especially in developing countries such as South Africa. These events pose a significant threat due to the low a...

Warm extreme temperature events or ‘heatwaves’ have disastrous impacts. Several high-impact heatwave events have recently occurred in the Global North, resulting in significant losses of human life and dire effects on economies. The expected increases in the frequency and intensity of extreme heat events under climate change pose a significant thre...

Across South Africa, a wide range of activities is influenced by differences in seasonality. In a South African context, there is little consensus on the timing of seasonal boundaries. Inconsistency exists through the use of ad-hoc approaches to define seasonal boundaries across South Africa. In this paper, we present one of the very first uniform...

Across South Africa, a wide range of activities is influenced by differences in seasonality. In a South African context, there is little consensus on the timing of seasonal boundaries. Inconsistency exists through the use of ad-hoc approaches to define seasonal boundaries across South Africa. In this paper, we present one of the very first uniform...

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Gedurende die laaste drie dekades van die 20ste eeu het die wêreld toenemend bewus geword van die globale omgewing en die impakte van menslike aktiwiteite op die omgewing. Vanuit ‘n omgewingsperspektief, het die massamedia bygedra tot die styging in omgewingsbewustheid en het, tereg of verkeerdelik, die fokus van die publiek gevestig op spesifieke...