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05 July 2022 | Story Mandi Smallhorne
Cathedral Peak

Why mountain research matters 

“I don’t think South Africa is prepared for the possibility of a Gauteng Day Zero drought,” said Professor Francois Engelbrecht, director of the Global Change Institute at the University of the Witwatersrand. 

Professor Engelbrecht was a keynote speaker at a session of the Southern African Mountain Conference 2022, held in the Drakensberg in mid-March this year and supported by, among others, the Afromontane Research Unit at the University of the Free State (UFS). The session, hosted by international network, GEO Mountains, looked at Long-term monitoring activities and associated data availability for climate change-related applications across Africa’s mountains: status quo and next steps.

The professor went on to say we came very, very close in the 2015-2016 drought, when the Vaal Dam dropped to 25% of capacity. Had it dropped just a bit more, to 20%, the most densely populated province in South Africa, our economic hub, would have been in serious trouble, as there would have been too little water to enable pumping the last dregs into the province.

What’s the link between a Day Zero event in Gauteng and data about mountain environments?

Think of the water towers that dot the Highveld landscape in Gauteng, very visible to residents of the suburbs. Mountains can be seen as massive ‘water towers’ that provide water to people hundreds, even thousands, of kilometres from their foothills. As Dr James Thornton of GEO Mountains, co-host of the session, explained, mountains provide a flow of ecosystem services; water provision is just one of them, but it is of critical importance. “The mountains are crucial for this, due to the orographic enhancement of precipitation.” The shape and topography of mountains (their orography), forces moist air upwards into cooler air at higher elevations – an effect called ‘orographic uplift’ – so that vapour held in the air condenses into water. 

So as moisture-laden air sweeps in from the warm Indian Ocean to the east of us, it encounters the upward thrust of the long Drakensberg chain of mountains, from the Eastern Cape through Lesotho and KwaZulu-Natal and on, up to the Wolksberg Mountains in Limpopo. The upward movement of the air into colder regions triggers precipitation – rain, mist, sometimes snow.

And that moisture, falling on the soil and rocks in cool mountain air, is also less likely to evaporate and return rapidly to the atmosphere, as it might do on the coastal plains and lowlands.

The result? The most obvious consequence is waterfalls glittering in the mountain cliffs and swollen streams rushing down the slopes. Look at maps and you’ll see rivers springing from mountain sources everywhere in the world, like the Tugela heading east and the Orange flowing west from the Drakensberg in South Africa and Lesotho, or the Ganges and Indus rising in the Himalayas and the Rhine and Rhône rising in the Alps.  

Mountain water also seeps into the ground, making its way through soil and rocks and recharging the groundwater within and beyond the mountains and their foothills. This recharge of the water table from high up in the mountains also contributes to streams and rivers that supply so much of our water needs, scientists have shown.  

Mountain water in Gauteng


Gauteng residents are well aware of the role of the Vaal River in the Vaal Water Supply System, but do we understand just how much of our water originates in the Drakensberg? According to the Water Research Commission “transfers from the Maloti Drakensberg (34.4%) and the Northern Drakensberg SWSA (18.9%)” are critical to our water supply. That’s a little more than half our water in Gauteng coming from the Drakensberg.

Engelbrecht and his co-authors wrote a few years ago: “Except for the Southern Cape, the Drakensberg is the single most important source of water in Southern Africa and supplies regions where the bulk of the population resides.” (The Drakensberg Escarpment as the Great Supplier of Water to South Africa, S.J. Taylor, et al, in Developments in Earth Surface Processes Volume 21, Mountain Ice and Water, Investigations of the Hydrologic Cycle in Alpine Environments.) But, they added, due to population growth and other pressures, “In South Africa, it is now expected that demand for water will exceed supply by 2025 if nothing is done to supplement current water resources.”

That in itself is reason enough to focus on monitoring our mountains, and to support scientists observing and gathering data there. But add that to Professor Engelbrecht’s prediction that “multiyear El Nino-type droughts may plausibly occur from the mid-century (2030-2060) onwards” due to the climate change crisis, and it’s clear that we desperately need to understand the detail of how our mountains provide us with water; we urgently need to understand what is changing in the mountains.

Research matters

The ongoing and rapid changes we’re seeing in these very sensitive environments, from changing precipitation patterns, to changing land-use, to increases in population, is why we really need to “monitor and track these changes, to understand the biophysical processes and their interaction with society, and to be able to better estimate the chance, for instance, of future extreme droughts on a more local scale so we can develop measures for mitigation and adaptation,” said Dr Thornton. Better management of upstream water resources – such as the massive ‘water tower’ in the Drakensberg and elsewhere – is one tactic we should be vigorously pursuing.

There is a paucity of data about our precious mountainous areas across the world, but especially in Africa, and one of the messages of this workshop and of the conference as a whole was the importance of not just doing the monitoring and gathering of data, but making it readily accessible to all. 

Dr Susan Janse van Rensburg (of the South African Environment Observation Network or SAEON, a national facility of the National Research Foundation) spoke about the in situ environmental monitoring that is being done in important mountain areas, including Cathedral Peak, the heart of the Central Drakensberg where the conference was being held. She introduced SAEON’s new Data Portal for researchers to access and share data about mountains – and not just in South Africa, but across the whole continent. 

Omar Seidu gave a presentation on an initiative called Digital Earth Africa which collates and curates satellite data – including data on mountains. And GEO Mountains itself runs inventories which “seek to identify, link up, and make accessible existing data and information resources across the world’s mountains”.

“We’re trying to make it straightforward for researchers on the ground to make their datasets available to anybody if they choose to do so,” said Dr Thornton.

Research, observations and data-gathering on the ground (and from satellites) is the foundation for intelligent analysis, which results in solid evidence that can guide policymakers and the public to make the best choices. Mountains, our water towers, have perhaps not been enough of a focus for society in the past; information about their vital role in something as basic as water provision, and better understanding of the processes that furnish us with water, will surely help us to both mitigate and adapt to a future in which water scarcity looms so large.

News Archive

Shimlas had the right attitude, says Scholtz
2016-02-10

 Description: Shimlas first match 2016  Tags: Shimlas

The lively Shimla flanker Daniel Maartens, who was the leading try scorer in the 2015 Varsity Cup, made a good impact as substitute against Ikeys in Cape Town.
Photo: Johan Roux

His rugby team had the right attitude to win in difficult conditions in Cape Town.

This is what Hendro Scholtz, Head Coach of Shimlas, had to say after the University of the Free State (UFS) started its Varsity Cup campaign on 8 February 2016 with a victory of 23-17 over Ikeys.

According to him, the UFS had to sweat hard until the end on a windy Green Mile, which has been the downfall of many opponents before. His substitutes also had a great impact.

Troublesome Cape wind

Shimlas have a tough draw this year, and to start in the Mother City was a huge task. Scholtz and his men have only three home matches and will play against most of the major teams in away matches.

“We knew it would be difficult in Cape Town. With the wind blowing as it does, one can't play as you would like to during the rest of the season,” the coach said.

“The guys had a will to win.”

The former Springbok believes that too much cannot be read from the first round results. The Shimlas will play their second match on 15 February 2016 against Tuks in Pretoria.

Replacements with good impact

Only the prop Rudolph Botha, flanker Fiffy Rampeta, and prop Teunis Nieuwoudt, who started against Ikeys, were involved in the 2015 final against Pukke.

Other big Shimla names, such as the prop Ox Nche, hooker Elandré Huggett, prop Conraad van Vuuren, and flanker Daniel Maartens, were sent onto the field in Cape Town after half-time.

“We had a plan with the replacements for the second half. They made a huge difference,” Scholtz said.

Rampeta was named Man of the Match, but it was Maartens and Co who turned the game in their team's favour in the second half.

Matsoele could be out of action for long

The Shimla fullback, Sechaba Matsoele, had to leave the game against Ikeys early because of a knee injury, and could be out of action for some time.

His scrumhalf, Zee Mkhabela, was also injured (by a blow to the head), so Shimlas will have to keep their fingers crossed for his quick recovery.

Scorers:
Shimlas 23 (7): Tries: Arthur Williams, Nardus Erasmus, Mosolwa Mafuma. Conversions: Stephan Janse van Rensburg (2).
Ikeys 17 (0): Tries: Khanyo Ngcukana, Nathan Nel. Conversion: Hilio de Abreu. Penalty: De Abreu.
Other results (home team first): Tuks 15, Pukke 38; UJ 19, Madibaz 12; Maties 40, CUT 0.

 

 

 

 


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