Sponge city construction concept and technical analysis?

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

Introduced the background of the concept of sponge city construction, and expounded the key technologies for building sponge cities from aspects such as water system wetlands, green squares, urban roads, and interior plots, so as to further promote resource-saving and environmentally friendly cities. The development of a friendly society.

Sponge city, as the name suggests, is a city like a sponge, absorbing water when it rains, releasing water during drought, and autonomously adjusting the urban dryness and humidity. The more official sponge city concept refers to a brand-new urban rainwater management concept, which is an urban construction method for cities to adapt to environmental changes and cope with rainwater disasters. Its mechanism is to absorb, store, seep, and purify water when it rains, and to release and utilize the stored water during drought. Now the country has tried this concept in some cities, hoping to achieve good results. Relevant experts and scholars have also conducted in-depth discussions, research, and implementation of this envisioned model.

1 Proposal of the concept of sponge city construction

1.1 Adapt to modern urban construction

Modern urban construction, with tall buildings and asphalt roads extending in all directions, makes the city The green space area is gradually reduced, the water seepage capacity is seriously reduced, and more and more rainwater resources flow into urban sewers, wasting water resources. The sponge city concept is proposed in response to this situation, making more use of rivers, lakes, green space vegetation in the city, and even some newly developed honeycomb-type large-porous permeable floor tiles to absorb rainwater that penetrates nature and prevent urban diseases—— —The occurrence of drought and flood disasters caused by precipitation uncertainty.

1.2 Maintain the balance of urban ecological environment

The earth is the home we depend on for survival. With the rapid development of cities, the emissions of automobile exhaust and industrial sewage have affected the urban ecology. The environment has been severely damaged. As a member of the city and a builder of sponge cities, it is urgent to maintain the ecological balance of the city. The construction of sponge cities plays its role through the construction of water system wetlands, green space squares, urban roads, internal digestion of land plots, etc., and these measures are convenient for maintaining the balance of the urban ecological environment.

1.3 Make full use of natural water resources

There was an impressive public service announcement before - the last drop of water in nature will be human tears, which shows that water resources important to humanity. In the past urban model, most rainwater flowed into urban sewer pipes through rainwater collection facilities such as manhole covers. The direct flow of clean and clear natural water into underground rainwater pipes is undoubtedly the greatest waste of precious water resources. More importantly, for some coastal cities affected by the monsoon, heavy precipitation in summer and even typhoons and storms can easily cause disasters such as urban waterlogging, landslides, and mudslides, posing a serious threat to the local economy and even people's lives and property. Therefore, the construction of sponge cities is conducive to making full use of water resources and reducing the safety losses of people's lives and property. Based on the three situations mentioned above, the construction of sponge cities will definitely play a huge role in alleviating urban "drought and flood" disasters, reducing the urban heat island effect, and promoting the urbanization process.

2 Key technologies in the sponge city construction concept

The sponge city construction concept is increasingly mature, but it still needs time to test the actual technical level and effect. Its key technologies mainly include: Four aspects, including water system wetlands, green squares, urban roads, and internal digestion of the plot, are introduced in detail below.

2.1 Water system wetland

As a city's purifier, water system wetlands play an important role in urban environmental protection, climate regulation, and ecological balance. The water system is a water network system composed of all rivers, lakes and other water bodies in the basin. Its regulating water storage effect is directly related to the length and direction of the river, the condition of the water system and the scope of the basin, the number and shape of tributaries, the shape and density of the river network, etc. Wetlands refer to shallow water areas with static or flowing water bodies such as natural or artificial swamps. Together with oceans and forests, they constitute the world's three major ecosystems. This shows its important role in the construction of sponge cities. .

Now more and more cities are beginning to build artificial lakes, whether in parks or residential areas, to build artificial lakes with beautiful shapes and cool water quality or artificial water belts to purify the environment and enhance urban water storage. Drainage capacity. The author believes that relevant departments have increasingly rich experience in wetland water system construction, and the technology for wetland water system construction in pilot cities is relatively mature. However, we must pay attention to management as well as construction, and give full play to the water storage, water replenishment, and purification of natural and artificial water system wetlands. Use water to build sponge cities, protect the ecological environment, reduce drought and flood disasters, and benefit urban residents.

2.2 Green Space Square

Green space is a professional term in urban planning. The full name is urban green space. It refers to the recreational space provided by the city to improve ecology, protect the environment and provide residents with and green space for landscaping. The green space square is actually a street garden in the city, with numerous vegetation. It uses photosynthesis to effectively absorb carbon dioxide and release oxygen, making a significant contribution to mitigating the urban heat island effect. With the development of urbanization, many cities have built infrastructure such as street gardens and square green spaces. While beautifying the environment and serving the people, they also play a powerful role in conserving water sources. They absorb water when it rains and release water through evaporation during drought.

In recent years, urban construction has used park green spaces as "reservoirs". The lush vegetation absorbs and conserves excess water in urban precipitation. The water in the vegetation then evaporates due to sunlight, forming small water droplets in the sky. It condenses into clouds and eventually lands in the city, realizing ecological water cycle. In order to build an emerging sponge city, the construction of green space squares is also urgent. The planting and cultivation of vegetation rely on experienced garden workers in the city. It is worth mentioning that the emergence of new honeycomb-shaped permeable floor tiles not only frees urban park paths from the muddy dirt roads in rainy and snowy weather, but also quickly and effectively penetrates rainwater through the floor tiles into the soil under the floor tiles, storing water and Paths in urban green spaces can make extensive use of this material to achieve the sponge effect of green spaces.

2.3 Urban Roads

Traffic determines the rise and fall of a city to a certain extent. Urban road traffic extending in all directions makes business exchanges more convenient, which is bound to boost the economy of the entire city. develop. Nowadays, urban roads are becoming wider, more elegant, and more solid as they are built. However, it cannot be ignored that these roads do not seep water, and even seriously hinder the drainage of rainwater, causing urban waterlogging. Therefore, during the construction of urban roads, attention should be paid to improving the sewer system, ensuring the safety of manhole covers, making full use of water-permeable and breathable materials to build urban traffic roads, reducing drought and flood disasters, and truly realizing the construction of sponge cities. In recent years, the city where I live has begun to vigorously advocate the improvement of urban sewer pipe systems, establishing a complete small water pipe system, reducing urban waterlogging, making full use of rainwater, and alleviating urban water shortages and other problems.

2.4 Inside the plot

As an indispensable part of urban construction, the planning of the interior of the plot also plays an important role in the construction and implementation of sponge cities. Land planning should be targeted and rationally arrange each part of the land according to the actual situation of the city. If we build a sponge city, we must pay attention to the construction of greening, gardens, wetlands, lakes, etc. Therefore, during the construction process, on the basis of ensuring the normal and orderly operation of the city, this part should be regarded as a key construction object to achieve the goal of sponge city. Proper planning. For example, cities must rationally plan land use and allocate the proportions of construction land, green land, wetlands and lakes in the city. Only reasonable planning can better play the role of water conservation and truly make the city develop better.

3 Conclusion

Sponge city is an emerging urban form that has emerged with the development and changes of the times. It is also a new urban concept. Its development conforms to the development concept of protecting nature and maintaining ecological balance. It will be promoted more widely in the future. Whether it is water system wetlands or green squares, or urban roads, or internal planning of land plots, these are the hardware facilities that sponge cities should have. What we have to do is to master sponge city construction technology and use sponge city construction policies to better serve urban residents, benefit the people, and build our unique resource-saving and environment-friendly society.

The above is collected and compiled by Zhongda Consulting

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