| With the continuous development of urban planning,the government attaches great importance to the planning of landfill sites.In recent years,many landfills are saturated,so the landscape reconstruction and ecological restoration project of closed landfill has become a very important research topic.In China,some landfill sites have carried out ecological restoration and landscape reconstruction projects,but there are still some problems,such as unreasonable use of resources,unreasonable site planning,lack of long-term supervision and so on.With the new concept gradually received attention,it has become a high-quality urban ecological restoration engineering concept.The strategy research and landscape stability exploration of landfill after its closure have important theoretical and practical significance for promoting the promotion of environmental protection concept,improving the quality of people’s production and living environment,and promoting urban expansion.After sorting out the concepts and principles of landfill and landscape re-engineering,combined with three different types of landfill re-engineering strategies and planning development direction,the landscape re-engineering schemes of landfill under different conditions are defined.Starting from the concepts of landscape ecology and landscape planning and design,the relationship between landscape and the strategies for ecological restoration are discussed.New landscape re-engineering strategies and stability evaluation indexes are formed by combining mature landscape planning and design principles with the theoretical basis of landscape ecology.The stability of the landscape re-engineering design after the matrix construction is evaluated and analyzed with the help of Yaahp software and risk control modeling index.Indicator selection and validation form the "evaluation-design-evaluation" recycle.Finally,it is implemented in the specific design,and the results of the validation study of the landscape re-engineering design after the closure of the Jiangcungou landfill site are used to provide the research ideas and experience of the landscape re-engineering strategies for similar design studies.The main results of this study are as follows.(1)This paper analyzes the site characteristics of three types of landfills: valley type,plain type and tidal flat type,analyzes the landscape reconstruction methods of landfills by combining with the reconstruction cases of each type of landfills,establishes the coupling system of ecological pattern and process,and helps to build the ecological restoration strategy.(2)This paper summarizes the role of phytoremediation,explores the technical methods of phytoremediation and the selection of niche,selects the plant species with various functions suitable for the landfill,forms the selection method with herbs as the main,shrubs as the auxiliary,a small number of trees and vines,and lists the selection table of functional tree species.(3)Starting from the overall scale,this paper constructs the evaluation index of landscape stability weight,and selects six indexes: landscape area,landscape shape,landscape connectivity,landscape functionality,landscape distance from receptor landscape,soil suitability and other external interference to calculate and evaluate the landscape stability.(4)Combined with the example of jiangcungou landfill,the landscape reconstruction design after closure is carried out.Through the overall planning of jiangcungou landfill,the design of each functional area,the selection of plants and other convenient design,combined with six index weight values that affect the stability,a more reasonable design is carried out,and finally the design is evaluated.It provides strategies for similar wind farm landscape reconstruction research. |
