久久亚洲国产成人影院-久久亚洲国产的中文-久久亚洲国产高清-久久亚洲国产精品-亚洲图片偷拍自拍-亚洲图色视频

'Sponge cities' absorb urban flooding woes

By TAN YINGZI in Chongqing, XING YI in Shanghai,XING YI and ZHANG XIAOMIN in Dalian, Liaoning | CHINA DAILY | Updated: 2020-10-19 07:35
Share
Share - WeChat
Workers build a drainage network in Zhangjiakou, Hebei province. CHEN XIAODONG/FOR CHINA DAILY

Pilot projects retain, reuse rainwater

Flooding is one of the most serious water-related issues in Chinese cities due to rapid urbanization, land-use changes and the disappearance of natural wetlands.

To cope with such problems, the nation turned five years ago to the concept of building "sponge cities" on an unprecedented global scale.

In 2015, the State Council, China's Cabinet, launched the Sponge City pilot project, in which 30 metropolises are taking part.

The aim of the project is that by 2030, some 80 percent of urban areas should absorb and reuse at least 70 percent of rainwater, according to guidelines issued by the State Council in October 2015.

Qu Jiuhui, an academician at the Chinese Academy of Engineering, said the concept of a sponge city is the Chinese version of low-impact development, which is common in North America.

"It refers to the management of rainwater runoff so that this water can be stored, used and channeled like a sponge," Qu said.

"It can solve the problem of too much rainwater flowing into the drainage system, and through eco-engineering, plants can also absorb pollutants and purify the water, as in nature."

Eco-engineering refers to the application of ecological principles to shape and manage the environment, in tandem with the design and use of technology that minimizes damage to the environment, or which actively helps to protect or sustain it.

A multi-layered array of artificial holes and pores at the entrance to the Shanghai Lingang Sponge City Exhibition Center showcases the sponge city concept.

Sitting beside the Dishuihu, a 5.6-square-kilometer artificial lake, the center's role is to explain the complicated concept of eco-engineering and urban planning to deal with flooding in big cities.

Lingang New City, located on the coast in Shanghai and which covers about 100 sq km, was selected as a pilot sponge city by the central government in 2016. Among the 30 pilot cities nationwide, it is the largest.

The exhibition center, which was unveiled last year, has set out to demonstrate how the sponge city concept has been translated into tangible infrastructure in the new city.

In the past three years, grass ditches, water-absorbent sidewalks, garden rooftops and artificial wetlands and water pools have been created to store rainwater.

Some 36 km of roads have been renovated and concrete sidewalks replaced with water-absorbent bricks to reduce waterpooling during heavy rainfall. Instead of going directly to drainage, the bulk of the rainwater is absorbed by the soil in grass ditches alongside the roads.

Retrofits have been completed in Lingang at 26 residential neighborhoods covering 200 hectares. This work included placing small water storage units under the earth, adding small stretches of grass in parking lots, and building underground water pools in existing gardens.

The construction standards used were written into the regulations being applied to real estate development in the city's new neighborhoods.

Yu Xiang, director of the center, said local people had asked why holes had been dug in their neighborhoods and whether the sponge city was effective.

"Since the sponge city was constructed in Lingang, the flooding issue has been addressed significantly, the environment has been improved and these questions are no longer being asked," she said.

Parks and universities are also important parts of the pilot program.

Luchaogang Park, a sponge park, opened to the public in Lingang in September last year. The site's original ponds were retained, with rainwater channeled to them for storage.

The campuses at higher education institutions in Lingang, including Shanghai Ocean University and Shanghai Dianji University, have been renovated.

Other Shanghai districts are also using the sponge city concept to begin infrastructural improvement work.

In July, Shanghai Hongqiao Central Business District, which includes Hongqiao International Airport and Hongqiao Railway Station, announced its sponge city plan for 2020 to 2035.

The aim is to ensure the district's roads are free from flooding-even in the event of rainfall on a scale seen only once every 100 years. Water quality in rivers will be improved and the urban heat-island effect reduced.

Duan Jin, an academician at the Chinese Academy of Sciences who took part in drawing up the master plan for the core area of the Yangtze River Delta demonstration zone, said the sponge city concept would be implemented in the zone.

Covering 2,300 sq km on the lower reaches of the Yangtze, the zone is a pilot green development and regional integration project for parts of Shanghai and neighboring Jiangsu and Zhejiang provinces.

"The area has a large and intricate network of waterways, so building sponge cities is a basic requirement to avoid urban flooding," Duan said.

1 2 3 4 5 6 Next   >>|
Top
BACK TO THE TOP
English
Copyright 1995 - . All rights reserved. The content (including but not limited to text, photo, multimedia information, etc) published in this site belongs to China Daily Information Co (CDIC). Without written authorization from CDIC, such content shall not be republished or used in any form. Note: Browsers with 1024*768 or higher resolution are suggested for this site.
License for publishing multimedia online 0108263

Registration Number: 130349
FOLLOW US
主站蜘蛛池模板: 亚洲欧美日韩精品高清 | 国产永久免费视频m3u8 | 成年黄色网址 | 亚洲免费在线观看 | 国产精品99久久久久久小说 | 欧美一级毛片免费看高清 | 99久久精品一区二区三区 | 久久久久久综合七次郎 | 亚洲巨乳自拍在线视频 | 免费一级特黄a | 中文字幕国产欧美 | 中文字幕在线观看一区二区三区 | 欧美精品国产一区二区三区 | 成年男女的免费视频网站 | 日本视频在线免费播放 | 亚洲精品第一区二区在线 | 青青自拍视频一区二区三区 | 精品一区二区三区免费爱 | 综合亚洲一区二区三区 | 国产精品久久国产三级国电话系列 | 日本成a人伦片 | 国产精品秦先生手机在线 | 国产成人午夜极速观看 | 噜噜噜狠狠夜夜躁精品 | 大量真实偷拍情侣视频野战 | 日韩在线 中文字幕 | 国产91久久最新观看地址 | 久久亚洲精品中文字幕 | 欧美不卡视频在线观看 | 久久在线免费视频 | 国产午夜爽爽窝窝在线观看 | 台湾黄三级高清在线观看播放 | 日日干日日操日日射 | 日韩欧美中文字幕在线视频 | 久久福利影视 | 精品视频一区二区三三区四区 | 毛色毛片免费观看 | 99视频精品全部在线播放 | 一级做a爱过程免费观看 | 成人午夜免费视频毛片 | 91视频久久 |