Evaluation and Utilization Strategy of Underground Space Resources of Canyon Cities in Cold Plateau Regions

In order to implement the requirements of the 20th National Congress of the Communist Party of China for building high-quality urbanization with a human centered approach, and to fully utilize underground space to build altitude cold canyon cities into green, low-carbon, ecological, and flexible cities, it is urgent to probe methods for evaluating the potential of urban underground space resources of altitude cold canyon cities and present multidimensional utilization strategies. Taking Ping'an District of Haidong city, a canyon city with high cold, drought, water scarcity, limited land, fragile ecology and frequent natural disasters as an example, with specialized urban geological surveys, field observations and experiments, based on the identification of urban geological conditions of Ping'an District, a new method for evaluating potential of underground space resources in high-cold canyon cities are proposed. The evaluation shows that the potential underground space resources in the mountains on both sides of the Huangshui River Valley in Ping'an District, Haidong City are 597.87× 10⁶m², with a potential underground space resource of 167.58 × 10⁶m² at the bottom of the river valley; The shallow underground space resources in the urban core area are little potential, and the areas with great potential are mainly distributed in the deep layers at the bottom of the river valley or in the mountains on both sides of the river valley. The utilization strategy of underground space is to make as much use of underground space as possible to leave more surface space for the construction of ecological green spaces, develop underground agriculture to solve the problem of insufficient local agricultural products, and use the deep underground space at the bottom of the Huangshui River Valley to build water storage projects, as well as emergency response projects for urban floods or emergency water source storage facilities. The research results can provide theoretical and methodological guidance for the utilization of underground space in high-cold canyon cities.