vol 9, issue 8

China bulldozes mountains to make way for cities

11 August 2014
By Rebecca Pool
Share |
Chinese mountain town

Chinese plans to turn mountain tops into bases for new cities could result in countless environmental problems

Shiyan area before levelling

The Shiyan area of China is just one area of the country that has been subject to ambitious urbanisation

Mountain levelling in Shiyan, China

Tens of square kilometres of land has already been created by mountain levelling in Shiyan and other areas in China

Lanzhou New Area

Lanzhou New Area is the biggest of five development projects to haul rural hinterlands into an urban 21st century

China's campaign to bulldoze mountains and create land for new cities is ambitious, even admirable, but now the world is worried.

Earlier this year, a group of hydrogeologists from China warned that their nation's campaign to decapitate mountains to create flat land and build cities could prove catastrophic.

Writing in Nature, Professor Peiyue Li from Chang'an University described countless environmental problems – air and water pollution, soil erosion, flooding – and urged Chinese government to seek home-grown and international scientific advice, and proceed with caution.

The media frenzy that followed flagged up the risks and dangers of China's ambitious urbanisation plans to the world, and now Prof Li eagerly awaits the fallout from his publication. As he tells E&T: "Following the paper, the [local government] Shaanxi Department of Science and Technology organised a meeting to bring together nationwide researchers to discuss land creation. This was a good start, but still no foreign scientists were invited."

So what exactly is the problem? If all goes to plan, in just eight years the Chinese government will have transformed a remote, largely peasant-populated, mountain region into an industrial hub housing half a million citizens.

Come 2020, Lanzhou Xinqu, or Lanzhou New Area, is expected to generate some 100 billion yuan – €12bn – in GDP. And this is just one – albeit the biggest – of five development projects to haul backward, rural hinterlands into an urban 21st century.

During the last decade, the government has been shearing the tops off mountains and filling the valleys in-between to create a plateau on which to build as part of its 'Go West' strategy. In Lanzhou, as well as Chongqing, Shiyan, Yichan and Yan'an, tens of square kilometres of land have already been created by mountain levelling and much more is to follow.

When finished, the Yan'an project will create 78.5 square kilometres of flat ground, doubling the area of the existing city while Lanzhou's planned area exceeds 300 square kilometres.

However, Prof Li warns: "These projects need more scientific guidance as important environmental and engineering risks exist."

A first for urban construction

As he points out, Yan'an is the largest project ever attempted on 'loess', thick but soft million-year-old deposits of wind-blown silt that can subside when soft. And while mountaintop removal in the form of strip mining has taken place in the US, the scale of activity in China is unprecedented.

Land creation aside, such massive areas of infill have never been used for urban construction, which also raises concern. As Prof Li highlights, the infill's ground base will need at least a decade to stabilise before construction can take place, and safe city construction is still not guaranteed. Yet vast sums of public money, along with private investment, are being relentlessly ploughed into the projects.

"Benefits to local and national residents are economic, environmental and social, but if we don't see big benefits the projects will be meaningless," he says. "Problems are not always apparent in the very short-term but they might become serious after a longer period, especially if the environmental and ecological [impacts] of land creations are not well considered."

Landslide hotspot

Over in the UK, Durham University researcher and co-director of the Institute of Hazard, Risk and Resilience, Professor David Petley, is avidly following developments in China. He says that such massive land movements can lead to landslides and, alarmingly, China has its fair share of these disasters.

In August 2008, a landslide toppled the waste dump of a local iron mine and buried Sigou Village in the northern Shanxi Province. There were 44 reported deaths. One month later, a mudslide at the Tashan Mine in the same province hit a warehouse killing 277 people and injuring dozens more.

On 29 March 2013, a massive landslide buried a mining camp belonging to Tibet Huatailong Mining Development, a wholly-owned subsidiary of China Gold International Resources, killing 83 people. Shortly afterwards, China-based researchers detected a massive landslide forming on the flanks of a reservoir close to the Laxiwa Dam in Qinghai Province, north-west China; possible damage, they said, could be "devastating".

This list, though not exhaustive, highlights a nation with an extraordinary history of landslides associated with mining and hydroelectric power generation. And worryingly, Prof Petley questions whether or not the nation has sufficient skill to prevent such accidents in its large-scale projects.

China poses a very challenging environment for landslides given its combination of steep slopes, high levels of seasonal rainfall and intense seismicity. For Lanzhou, Yan'an and other projects, Prof Petley believes flowslides – rapid and very destructive flows of loose materials typically triggered by an earthquake or rainfall – are a very real risk.

"The danger here is that the potential for flowslides from the materials blasted and then dumped as fill must be high, especially in areas that have high seasonal rainfall and/or earthquakes," he says. "Slicing off the top of a mountain also creates a large surface for water infiltration. This could drive up groundwater, also increasing the potential for instabilities.

"These landslides are not inevitable and can be avoided with a very good understanding of what can happen and good engineering," Prof Petley advises. "But unfortunately, one's confidence in China is not high."

He recommends detailed analysis of the materials, geology and hydrogeology of the slopes. "There needs to be ongoing monitoring of these as well as the behaviour of the emplaced fills," he says.

Yet this is, of course, the crux of the problem. For such an ambitious plan of massive national development – Prof Petley reckons the size of land movement is unprecedented in a mountain chain – the Chinese government seems to be proceeding at a spectacularly rapid rate without the necessary scientific and engineering guidance.

According to Prof Li some research has taken place, but this appears to be too little, too late. "The Department of Science and Technology of Shaanxi and the Ministry of China have granted 30 million yuan [€3.5m] to local research teams to conduct relevant research on land creation," he says. "The engineering project of Yan'an started in April 2012 but the research started in July 2012, so the research lags the engineering."

What's more, Prof Li believes that government research funds to date have only been attributed to the Yan'an project. "The cities are located in different regions of mainland China so engineering, hydrogeological and environmental conditions and resident density varies from city to city," he says. "Each project needs scientific guidance but, to my knowledge, the project in Yan'an is the only one funded by local and national government."

Earth impacts

Research aside, surely China's environmental regulations should at least steer development? According to Prof Li, guidelines do not exist for land creation in complex geological regions to mountainous zones and, even worse, many projects are ignoring existing regulations.

For example, in April 2013 air pollution brought work on the Lanzhou project to a grinding halt. Yet only four weeks later, and despite incomplete assessments, construction resumed due to mounting costs to government and contractors.

Prof Li is under no illusion that these projects will not be stopped, despite growing environmental concern. Given this, he believes the government's cosy assumption that such land creation will bring economic prosperity should be tested. As he says, the need to wait for infill land to stabilise indicates a long payback time for investors; economic research and cost models would quantify this.

However, while Prof Li and fellow researchers start to assess the risks of such mammoth land-moving exercises on Chinese residents and their local landscape, the developments are prompting some researchers to speak out about the bigger picture.

Dr Jan Zalasiewicz, a senior lecturer in paleobiology at the University of Leicester, UK, believes China's new cities, as well as other, similar projects such as Palm Island in Dubai, are having a massive impact on the Earth's entire geology.

"The re-engineered landscapes reported from China and Canada's Athabasca tar sands involve large-scale, multi-million tonne rock and soil transfer from one place to another," he says. "A recent 'back of a beermat' calculation showed that about 500 billion tonnes of concrete have been made on Earth, which is about one kilo of concrete per square metre of the Earth's surface, both land and sea."

Dr Zalasiewicz points out that about half of this concrete has been made in the last 20 years, and the changes don't stop here.

"We have converted about 40 per cent of the land surface to agriculture and modified more than 90 per cent of our continental shelves via trawling," he says. "As these thing happen, you get changes in the water cycle, the landscape, soils, associated chemical changes and so on. With these dynastic changes we are creating a new geology."

World-changing developments

Given the drastic rate of change, concerns over the global impact of the world's significant developments are rising with some researchers calling for 'planetary stewardship', the international global-scale management of the Earth's entire biological, chemical and physical processes. But surely, as the worrying story of China's development unfolds, the notion of worldwide cooperation on any large-scale development is, at least for now, ludicrous?

Dr Zalasiewicz maintains his field-of-expertise is grounded in interpreting the impact of human activity. "I try to deal with the facts on the ground into geology, but I certainly have colleagues who say we are now the dominant force on Earth so we'd better make a good job of it," he says. "My own suspicion is that, as ever in history when you get these large scale changes, there will be winners and losers."

But still Prof Li is hopeful that at least in his nation, a combined effort from researchers around the world will make a difference. In Nature, he states that scientists from the US Geological Survey, the US Environmental Protection Agency, the International Association of Hydrogeologists and universities in Canada, the US and across Europe should now be brought in. And as he tells E&T: "Scientists that have similar experience in similar land creation, especially those in the US with strip-mining experience, should be invited to join.

"We are inviting two US scientists to China this summer," he adds. "I hope they will give us suggestions on this project." 

Share |

Bold new cities

Chinese government has mapped out five state-level development zones in the western regions of its nation, with initial plans as early as the 1990s. The 'Go West' campaign started in 2000, and reports from state-run China Daily indicate that Lanzhou alone has attracted 90 projects with some of the country's 'top 500' companies, including constructing factories Geely Automobile and Sany Heavy Industries.

Why the west? From 1978 to 2012, the fraction of the nation's population living in cities rose from a meagre 17.9 per cent to 52.6 per cent and now China's government has set a target for the country's urban population to reach 60 per cent by 2020. Figures are rising but, to date, development has largely taken place in the east where some 36 per cent of the nation's land supports 96 per cent of the population.

Nanjing-based China Pacific Construction Group, behind the campaign, has deflected criticism that the Lanzhou project isn't viable for several reasons, including scarcity of water. Spokesperson Angie Wong has reportedly said: "Lanzhou's environment is already really poor... our protective style of development will divert water to the area, achieve reforestation and make things better."

Meet the Anthropocene

Dr Jan Zalasiewicz is one of an increasing number of researchers that believes humans have permanently changed the Earth's lithosphere, or crust, ushering in a new geological epoch; the Anthropocene. Based on the lithostratigraphy – the science of strata – the new era defines Earth's most recent geologic time period as being human-influenced but the jury is still out on when it actually started.

First proposed in 2000 by Nobel Prize-winning scientist Paul Crutzen, Dr Zalasiewicz and colleagues published the first proposal for the formal adoption of the Anthropocene epoch by geologists in 2008. This adoption is now pending.

"Humans have been modifying the Earth now for some thousands of years, so we have the problem of when should the Anthropocene start," says Dr Zalasiewicz. "Suggestions range from several thousand years ago, when extinctions first started, to when agriculture started or just a few decades ago with the nuclear age and the spread of radionuclides. The latter looks to be the leading candidate."

Related forum discussions
forum comment To start a discussion topic about this article, please log in or register.    

Latest Issue

E&T cover image 1605

"We visit Barcelona, one of the smartest cities in the world, to find out what makes it so special. What does it look like and what is the future?"

E&T jobs

  • Senior Development Engineer, Electronics

    Premium job

    Helmet Integrated Systems / Gentex Corporation
    • Letchworth Garden City, Hertfordshire
    • Competitive

    We are an innovative, robust and fast growing business, whose main focus is to deliver continues improvement to existing products and offer new sol..

    • Recruiter: Helmet Integrated Systems / Gentex Corporation

    Apply for this job

  • Smart Grid Research Engineer

    Premium job

    University of Strathclyde
    • Cumbernauld, Glasgow
    • Grade: 6/7* £26,537 - £37,768*

    Work as part of a growing dynamic team on a wide range of technical projects with particular emphasis on experimental validation and testing

    • Recruiter: University of Strathclyde

    Apply for this job

  • Electrical Asset Specialist

    Affinity Water
    • Hatfield, Hertfordshire

    Responsible for updating and writing electrical engineering standards, approved codes of practice and safe systems of work

    • Recruiter: Affinity Water

    Apply for this job

  • Senior Electronics Engineer

    York Instruments
    • York, North Yorkshire

    Senior electronics engineer to work as part of a team developing an MEG imaging system; working with the engineering team and external contractors.

    • Recruiter: York Instruments

    Apply for this job

  • Manufacturing Engineer - Circuit Card Assembly

    MBDA
    • Lostock Junction
    • Competitive Salary & Benefits

    What’s the opportunity?   Manufacturing UK is an integral part of the Operations Directorate whose principal mission is to ensure that MBDA’s deliverable commitments are met...

    • Recruiter: MBDA

    Apply for this job

  • High Voltage Engineer

    Premium job

    Essex X-Ray & Medical Equipment
    • Great Dunmow, Essex

    This High Voltage Engineer will provide design leadership for high voltage cable assemblies up to one megavolt.

    • Recruiter: Essex X-Ray & Medical Equipment

    Apply for this job

  • Team Leader - Flank Arrays

    BAE Systems
    • Barrow-In-Furness, Cumbria, England
    • Negotiable

    Team Leader - Flank Arrays Would you like to work in a unique role within the construction of the Astute Class submarines? We currently have a vacancy for a Team Leader - Flank Arrays at our site in Barrow-in-Furness. As a Team Leader - Flank Arrays, you

    • Recruiter: BAE Systems

    Apply for this job

  • Electronics and Software Engineer

    Copley Scientific Ltd
    • Nottingham
    • circa £35,000 per annum + bonus

    Develop new test equipment for the pharmaceutical industry. Good opportunities to grow and develop. Successful family-owned and managed business.

    • Recruiter: Copley Scientific Ltd

    Apply for this job

  • Bridge Test Facility Manager

    BAE Systems
    • Shropshire, Telford, England
    • Negotiable

    Bridge Test Facility ManagerWe currently have a vacancy for a Bridge Test Facility Manager at our site in Telford with our Land UK business.As the Bridge Test Facility Manager, you will be part of our Test & Trials team, working closely with the Mili

    • Recruiter: BAE Systems

    Apply for this job

  • Intelligent Transport Systems Engineer - Highways Technology

    Premium job

    Mott MacDonald
    • Birmingham, West Midlands

    Our transport technology team in Birmingham is currently growing a highly skilled and customer-focused team to...

    • Recruiter: Mott MacDonald

    Apply for this job

More jobs ▶

Subscribe

Choose the way you would like to access the latest news and developments in your field.

Subscribe to E&T