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How to manage urban expansion in mega-metropolitan areas?

Philip E. Karp's picture

As the world becomes increasingly urbanized, the number of megacities is growing rapidly.

Today there are 37 cities worldwide with populations of greater than 10 million, and 84 with populations greater than five million. More than three quarters of these cities are in developing countries. Together with their surrounding metropolitan areas, these cities produce a sizable portion of the world’s wealth and attract a large share of global talent.

These megacities face a series of common challenges associated with managing urban expansion, density, and livability—in a manner that takes advantage of the benefits of productive agglomerations, while mitigating the disadvantages of such high degrees of congestion and urban density.

Moreover, like other metropolitan areas, megacities face challenges of effectively coordinated planning, infrastructure development, and service delivery across multiple jurisdictions. Indeed, the New Urban Agenda issued at the Habitat III conference in 2016 identified metropolitan planning and management as one of the most critical needs to ensure sustainable urbanization.

改造城市滨水区

Fen Wei's picture
Also available in: English
HafenCity, Hamburg. Photo Credit: ELBE&FLUT / Thomas Hampel at http://www.hafencity.com
港口新城,汉堡。
图片来源: ELBE&FLUT / Thomas Hampel at http://www.hafencity.com
 “滨水区不只是孤立存在的。它与其他所有的东西相关。” —— 杰出的城市规划师Jane Jacobs说。
 
这种关系是两方面的;它指的是城市与其滨水区的关系,这种关系不断变化正如城市本身不断变化一样。
 
在工业化时代,城市滨水区是服务于城市的后院,但最近几十年来,它已经从以前的定义发展演化,有了新的含义。

一方面,在改变城市结构甚或重塑城市形象方面,滨水区发挥了更重要的作用。
 
另一方面,成功的城市滨水区也展示了可以怎样释放和利用城市资源(如可利用的土地、更清洁的水、历史遗产保护和城市更新),以及怎样将这些因素融入城市和公众的生活。

[参阅: 城市土地再生:利用私人投资从业者指南]

Transforming urban waterfronts

Fen Wei's picture
Also available in: 中文
HafenCity, Hamburg. Photo Credit: ELBE&FLUT / Thomas Hampel at http://www.hafencity.com
HafenCity, Hamburg.
Photo Credit: ELBE&FLUT / Thomas Hampel at http://www.hafencity.com
“The waterfront isn’t just something unto itself. It’s connected to everything else,” said Jane Jacobs, a prominent urbanist.
 
This connection is twofold; it refers to the relationship between cities and their waterfronts – as ever-changing as cities themselves.
 
Evolving from its past definition during the industrial era as a city’s service yard, the urban waterfront has, in recent decades, taken on new meanings.

On one hand, the waterfront is playing a more significant role in transforming the urban fabric of a city or even reshaping a city’s identity.
 
On the other hand, successful urban waterfronts have also demonstrated how city resources – such as available land, cleaner water, historic preservation, and urban revitalization – can be unlocked and realized, and how these elements can be integrated into the city and public life.
 
[Read: Regenerating Urban Land: A Practitioner's Guide to Leveraging Private Investment]