Sponge city construction concept and technology analysis?

What is the concept of sponge city construction? How to analyze the technology? Please see the article edited by Zhongda Consulting.

Introduces the background of the concept of sponge city construction, and describes the key technologies for building sponge cities from the aspects of water system wetland, green square, urban road, and the interior of the land parcels, so as to further promote the development of resource-saving and environment-friendly society.

The sponge city, as the name suggests, is a city like a sponge, absorbing water when it rains, releasing water when it dries, and autonomously regulating the dryness and humidity of the city. The more official official concept of sponge city refers to a new concept of urban rain and flood management, is the city to adapt to environmental changes, to cope with rain and floods, a way of urban construction. Its mechanism is to absorb, store, infiltrate and purify water when it rains, and release and utilize the stored water when it dries. Nowadays, the country has put this concept on a trial basis in some cities, with a view to achieving good results. Relevant experts and scholars have also been in-depth discussion, research, practice this conceptual model.

1 sponge city construction concept

1.1 to adapt to the modernization of urban construction

Modernized urban construction, high-rise buildings, asphalt roads in all directions, so that the urban green space area is gradually reduced, the seepage capacity is seriously reduced, and more and more rainfall resources flow into the city sewers, wasting water resources. The concept of sponge city is put forward in response to this situation, more use of urban rivers and lakes, green space vegetation, and even some newly developed honeycomb-type large pore infiltration tiles to absorb and infiltrate nature's rainfall, to prevent urban diseases --- droughts and floods caused by the uncertainty of precipitation occurs.

1.2 Maintenance of urban ecological balance

Earth is our home, with the rapid development of the city, automobile emissions, industrial sewage emissions, the urban ecological environment has been seriously damaged, as a member of the city, sponge city builders, maintaining the urban ecological balance can not be delayed. And sponge city construction is precisely through the construction of water system wetland, green square, urban roads, internal digestion of land parcels to play its role, and these measures to facilitate the maintenance of urban ecological balance.

1.3 Make full use of natural water resources

Previously, there is an impressive public service announcement - the last drop of nature will be human tears, which shows the importance of water resources for human beings. In the previous urban model, most of the rainwater flows into the city sewer through the manhole cover and other rainwater collection facilities, and the direct flow of clean and clear water from nature into the underground rainwater pipe is undoubtedly the biggest waste of precious water resources. More importantly, for some coastal cities affected by the monsoon, heavy precipitation in summer and even typhoons, storms can easily cause urban flooding, landslides, mudslides and other disasters, the local economy and even the safety of people's lives and property pose a serious threat. Therefore, the construction of sponge city is conducive to the full utilization of water resources, reduce the loss of people's lives and property safety. Based on the three situations mentioned above, the construction of sponge cities will certainly play a huge role in alleviating urban "drought and flood" disasters, reducing the urban heat island effect, and promoting the process of urbanization.

2 key technologies in the concept of sponge city construction

The concept of sponge city construction is becoming more and more mature, but the actual level of technology and the effect of time is still needed to test the key technologies include: water wetlands, green squares, urban roads, internal digestion of the land plot and other four aspects, the following is a detailed introduction.

2.1 Water system wetland

Water system wetland as the city's purifier of urban environmental protection, climate regulation, ecological balance has an important role. Water system is a water network system composed of all rivers, lakes and other water bodies in the watershed, and its regulating and storing water has a direct relationship with the length of the river, the flow direction, the status of the water system and the watershed range, the number of tributaries and their forms, the shape of the river network density and so on. Wetland is a natural or artificial formation of marshes and other shallow areas with static or flowing water, with the ocean, forest *** with the composition of the world's three major ecosystems, which can be seen in the construction of sponge city's important role.

Now more and more cities are beginning to build artificial lakes, both parks and neighborhoods, the construction of beautiful shape, water quality and cool artificial lakes or artificial water belt used to purify the environment and enhance the city's water storage and drainage capacity. The author believes that the relevant departments of the wetland water system construction experience is increasingly rich, about the pilot city of wetland water system construction of its technology is more mature, but pay attention to the construction of heavy at the same time more important management, give full play to the natural and artificial water wetland water retention, replenishment, water purification role, the construction of sponge city, protect the ecological environment, to reduce the droughts and floods, for the benefit of the city residents.

2.2 green square

Green space is a professional term in urban planning, known as urban green space, refers to the city specifically for the improvement of ecology, protection of the environment, open space for residents and landscaping landscape used in the green space. Green space plaza is actually a street garden in the city, in which there are many vegetation, the use of photosynthesis to effectively absorb carbon dioxide and release oxygen, to alleviate the urban heat island effect to make a significant contribution. With the development of urbanization, many cities to build street garden, square green space and other infrastructure, in the beautification of the environment, services to the masses at the same time, but also played a powerful function of water conservation, when it rains, water absorption, evaporation and release of water in times of drought.

In recent years, the city building the use of parks and green spaces as a "cistern", by the lush vegetation to absorb excess water in the city precipitation, and then by the sunlight irradiation of vegetation in the evaporation of water, the formation of small droplets of water in the sky condensed into a cloud, and ultimately landed in the city, to achieve the ecological water cycle. In order to build the emerging sponge city, the construction of green square is also imminent, vegetation planting and cultivation rely on the city's experienced gardeners. It is worth mentioning that the emergence of new honeycomb permeable floor tiles, so that the city park paths not only get rid of rain and snow weather dirt roads muddy, but also fast and effective rainwater through the tiles penetrate into the soil under the tiles, storage of water, in the city's green space in the path can be a large number of use of this material to achieve the sponge role of the green space.

2.3 city roads

Transportation to a certain extent determines the rise and fall of the city, well-connected urban road traffic to make business contacts more convenient, which will inevitably lead to the economic development of the entire city. Nowadays, the more the city roads are built more wide, the more the more the construction of the more grand, the more the construction of the more solid, but can not be ignored is that these roads do not seepage, and even serious obstacles to the drainage of rainwater, resulting in urban flooding. Therefore, urban roads in the construction should pay attention to improve the sewerage system, firm well cover safety, make full use of permeable and breathable materials to build urban traffic roads, reduce droughts and floods, and truly realize the construction of sponge city. I live in the city in recent years has begun to vigorously advocate the improvement of urban sewerage system, the establishment of a perfect small water pipeline system, to reduce urban flooding, make full use of rainwater, to alleviate the city's water constraints and other issues.

2.4 Inside the plot

As an indispensable part of urban construction, the planning of the inside of the plot also plays an important role in the construction and implementation of sponge city. Plot planning should be based on the actual situation of the city, targeted, rational arrangement of each part of the land. If the construction of sponge city, we should pay attention to the construction of greening, gardening, wetlands, lakes, etc. Therefore, in the process of construction, on the basis of ensuring the normal and orderly operation of the city should take this part as the key construction object to realize the reasonable planning of sponge city. For example, the city should be rational planning of land use, allocation of building land, green land, wetlands and lakes in the city in the proportion of reasonable planning to better play the role of water conservation, really make the city develop more beautiful.

3 Conclusion

Sponge city is with the development of the times changes in the emerging urban form, but also a new urban concept, the development of its compliance with the protection of nature, to maintain the ecological balance of the development of concepts, in the future will be more widely promoted. Whether it is water wetland or green square, or urban roads, land internal planning, these are sponge city should have the hardware facilities. What we need to do is to master the sponge city construction technology, the use of sponge city construction policy, better service for urban residents, for the benefit of the people, to build our unique resource-saving, environmentally friendly society.

The above is collected and organized by Zhongda Consulting

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