Study on sustainable development and construction of karst mountain city based on the concept of a sponge city

Abstract

In recent years, there has been rapid urbanization development in China. The rapid expansion of cities and the increase in the proportion of the area of impervious surfaces have caused urban flooding problems. The karst area in Southwest China is characterized by a sensitive ecosystem, poor self recovery ability and typical karst development. The problems of a fragile and imbalanced water ecology are particularly prominent in karst areas, making it necessary to explore the applicability of the concept of sponge cities in such environments. This study reviews the technical ideas, methods and concepts of sponge cities in China and abroad in recent years. Guiyang, a typical karst mountain city in China, was taken as an example in this study. This was because Guiyang has special hydrogeological characteristics as well as the current urbanization development processes that are affecting the water resources and the environment in the region. It is believed that the construction of mountain sponge cities in karst areas should be mainly through source reduction, process control and end management, combined with intelligent construction methods. Focus should be on strengthening the prevention and control of soil erosion in key areas and risk areas and on properly handling the relationship between urban construction and water resources and ecological environment protection.

The Carbon Emission Intensity of Rainwater Bioretention Facilities

“…where CE represents the full life cycle carbon emissions of the BF in kg CO Note: 1 The constant values concerning the relevant carbon emission factors are taken from studies such as Li [48], Ma [49], and Li [50] by accounting. Based on the LCA theory, the carbon emission intensity of VCA, defined as the ratio of carbon emissions of the facility over the runoff control volume throughout its life cycle, is proposed.…”

“…Other symbols have the same meanings as before. Note: 1 The constant values concerning the relevant carbon emission factors are taken from studies such as Li [48], Ma [49], and Li [50] by accounting.…”

Research on the construction path of Yiwu sponge city during the 14th Five-Year Plan period

“…New public building and municipal infrastructure projects in priority construction areas are required to install rainwater infiltration, purification, collection and utilization facilities to make full use of rainwater resources, such as watering roads and greening. Establish rainwater reuse facilities for each household in the residential community, rainwater can be used for low-quality water such as toilet flushing, and consider implementing certain subsidy policies [8], according to the volume of rainwater recycling per household to be subsidized, to encourage the construction of rainwater storage and reuse facilities [9], to create a water-saving sponge city with Yiwu characteristics.…”

Exploration on the Application Path of Sponge City Technology in Landscaping in the New Period

“…The application of sponge city in urban landscaping project is not only a single technology, but also needs to be built according to local conditions for different regional environments, and at the same time, it needs to be effectively combined with various modern technologies and materials, so as to give full play to the maximum utility of sponge city, assist urban landscaping and achieve the best ecological environment protection. For example, in the project of "Guangming Department of Shenzhen Experimental School" in Shenzhen, the construction of this project combines and applies a variety of modern technologies at the same time, thus making the landscape effect very good [8] . The peak reduction rate of external drainage encountered in the three years after its complete construction has reached 18%, and the impact on the historical waterlogging points of the original Niushan Road has been effectively reduced.…”