UCT Researchers Conduct River Mega-transect on a Senqu2Sea Expedition

Three University of Cape Town researchers are on a two-month source to sea journey along the Orange River – from Qacha’s Nek in Lesotho to Alexander Bay on the border between South Africa and Namibia. The researchers who have embarked on the Senqu2Sea Expedition to conduct a river mega-transect, are paddling an average of 40 kilometres each day, often battling stormy weather and rapids.
senqu2sea expedition on orange river

Photo: James Puttick


“The aim of the expedition is to traverse the length of the Orange River, from Qacha’s Nek in the majestic Maluti Mountains of Lesotho down to Alexander Bay on the barren sandy Atlantic Coast. We’re undertaking some research which is unique to this type of venture: a true river mega-transect,” said MSc graduate, Sam Jack.

The transect will provide an ecological census of the natural vegetation and ecosystems along the country’s biggest waterway.

Jack is travelling together with UCT PhD student, James Puttick, and statistical science lecturer, Ian Durbach. The team will be compiling a baseline photographic record of the river and its surrounds by taking regular shots on the river, and from the river bank.  

orange river

View of the Orange River. Photo: Ruark du Toit.


Puttick, who studies vegetation and climate change in eastern South Africa, has been taking photographs from his kayak at two-kilometre intervals. The GPS position of photographs will allow others to take pictures later, and assess the degree of landscape change in terms of development on the river banks and the extent and composition of the vegetation.

The team is also taking diatom samples of the slimy layer covering submerged rocks and macrophytes. This is seen as a proxy for water quality and the health of the river system.

diatom water sampling along the Orange river

Ian Durbach and Sam Jack conduct the daily diatom sampling along the Orange River. Photo: James Puttick.


The expedition is being supported by UCT’s Plant Conservation Unit, the Mazda Wildlife Vehicle Fund and the Arid Lands Node of the National Research Foundation’s South African Environmental Observation Network (SAEON).

An oxygen isotope project, led by Roger Diamond of the Geology department at UCT, will receive water samples collected from the main tributaries feeding into the Orange River, as well as from the Orange River itself. “This data will be interesting for exploring the different conditions that exist within different tributaries’ watersheds during rainfall events,” said Jack.

The trio of adventurers are clearly excited about their expedition, but it’s not all plain paddling. They’ve already notched up an array of adventures along the way including being caught in a thunderstorm in the middle of the night, a paddle breaking, falling out of kayaks while going down rapids and meeting fascinating people en route.

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