Dr Natasha Wallum
BSc MSc S'ton, DPhil Oxf, CGeog, FRGS
Departmental Lecturer
I completed my BSc (Hons) in Physical Geography and MSc in Applied GIS and Remote Sensing at the University of Southampton, where my undergraduate dissertation received national awards from the Royal Geographical Society (with IBG) and the British Society for Geomorphology. After working as a corporate geospatial analyst in London, I returned to academia to undertake a DPhil in Environmental Research at the University of Oxford, funded by the UKRI Natural Environment Research Council (NERC) Doctoral Training Programme and Hertford College. My doctoral research explored the geomorphological and geochemical controls on dust emission from Etosha Pan in Namibia, a major dust source in the Southern Hemisphere. My current role at the University of Oxford combines research and teaching in Physical Geography, with a particular focus on geomorphology, Earth system science, and data-driven approaches to studying environmental change.
As a College Tutor in Physical Geography at Brasenose, I teach and supervise undergraduates across both the Preliminary Examinations (Prelims) and the Final Honours School (FHS). My teaching spans geomorphology, Earth system science, environmental geography, and quantitative methods, including the core Prelims papers Geographical Techniques, Earth Surface Processes, and Geographical Controversies, and the FHS papers Earth System Dynamics, Geographical Thought, and Environmental Geography. I also supervise undergraduate, Master’s, and DPhil research projects in geomorphology, environmental change, dust emission processes, and Earth observation.
Alongside my college teaching, I am a Departmental Lecturer in Physical Geography in the School of Geography and the Environment, where I convene and lecture on the core Prelims papers Geographical Techniques, Earth Surface Processes, and Geographical Controversies, and the FHS paper Earth System Dynamics. I also convene the optional FHS paper Desert Landscapes and Dynamics and contribute lectures in remote sensing to the optional FHS paper Geographic Data Science. My work in the department focuses on integrating fieldwork, GIS, and remote sensing to investigate environmental processes and landscape change. I lead field teaching in both coastal and dryland environments, including undergraduate field courses in Portland and Tenerife, and contribute to postgraduate training within Physical Geography and the environmental sciences.
My research interests and experience encompass aspects of aeolian geomorphology and are primarily focused on the global dust cycle, with emphasis on the investigation of the geomorphological and hydrological processes that modulate the emission of atmospheric mineral dust from large ephemeral lake bed sources in dryland regions.
I combine satellite remote sensing, field investigation, and laboratory-based sediment analysis to understand how variations in surface composition, morphology, and hydrology control the timing and intensity of dust emissions. Much of my current work focuses on southern Africa, where I use field and spaceborne imaging spectroscopy to examine the surface mineralogy and geochemistry of major ephemeral lake systems such as Etosha Pan in Namibia. This research contributes to improving the representation of dust source processes in global climate and atmospheric models, with broader implications for climate feedbacks, air quality, and ecosystem dynamics.
A full list of research publications is available here: https://scholar.google.com/citations?user=bjyEYPIAAAAJ&hl=en