There are many factors that cause the above situation. As far as I know, a successful sunken plaza should have three elements: scale, depth and spatial relevance.
Since the sunken sub-square is to pray for the effect transformation of space, vision and use function, its sinking amount must have a certain depth, otherwise it will not achieve the expected purpose. The so-called "sunken" square with a small amount of sinking, if you are in it, you can see messy legs and wheels, and there is no sense of space scale, atmosphere, environment, vision, place change, and of course there is no aesthetic feeling. The city square cannot be understood as a piece of flat land in Ma Pingchuan. Besides, the original terrain of the square is always uneven. When designing and creating a square, designers should not call the slight height difference "sinking", just as no one calls the beauty of the building platform and observation deck "sinking". A slight change in the treatment of height difference is not a "sinking" square in the true sense.
So, how deep is it appropriate to sink? This is related to the size of the sub-party itself. The author believes that it is generally appropriate for people to see the near-ground scenes outside the blue sky, white clouds and trees as little as possible in the sub-square.
The sinking square should not be designed as an isolated subspace. It should be connected in series with the adjacent underground space and become an important part of the whole space sequence. Practice has proved that isolated sub-squares are not easy to attract people, but series spaces can attract people.
Sink the square and create the second space of the city.
It is a closed and open public space, and its whole and part sink into the surrounding environment. The difference between it and the ground square is mainly manifested in the sense of enclosure, plane modeling, ground design and safety. As one of the manufacturing methods of open space in high-density central cities.
Sinking needs rich forms.
Why does the sinking square exist? Generally speaking, developers don't just make sinking squares for sinking squares, but mainly serve the belt-type underground shopping malls, underground clubs and underground tracks connected with them, so as to solve the problems of ventilation, lighting and fire fighting in underground spaces, improve comfort and make the original underground spaces "see the light again".
"sunken plaza, as an urban open space, has diversified forms." He Jian, the chief architect of Greentown Oriental Architectural Design Co., Ltd. pointed out: "The sunken square can be vertical greening falling from the platform; You can also place some sketches and chairs to provide a rest space; The treatment of waterscape is also common. Because there is a gap between sunken plaza and the ground, it is more suitable for waterfalls, fountains, pools and other water features. Water curtains, underwater sounds and splashing water can add vitality and interest to the landscape. "
"In addition, the scale of sunken plaza must have a certain scale, and pay attention to the connection between roads and squares." He also stressed that "the boundary around the square should not be too obvious, and it should be well integrated with the surrounding roads and communities to avoid becoming an independent sculpture or a' hard pit'. It is necessary to soften the hard space as much as possible, let the square blend into the environment, and let people have the idea of going down and looking, not just a small hole.