Ecological Restoration And Landscape Rehabilitation Model Of Urban Wasteland

Urban Wasteland is abandoned or unutilized land due to improper use or planned changes in urban development and industrial production.In recent years,with the destruction of ecological environment and the shortage of land resources,more and more attention has been paid to urban wasteland in cities.In particular,there have been a large number of diverse causes,diverse pollution modes,large-scale,complex structures,unbalanced land use,and surrounding complex urban wasteland.The ecological rehabilitation and reuse of urban wasteland is a major problem for sustainable development of cities.With the diversified needs of urban wasteland transformation goal,The traditional urban wasteland transformation and utilization mode can no longer meet the needs of ecological civilization construction and urban sustainable development.This thesis proposed a new mode of urban wasteland re-use: Ecological Restoration and and Landscape Rehabilitation of Urban Wasteland(ERLRUW)model.This model is based on the intersection of disciplines,aiming at the insufficiency of the two “mainstream” models of the existing single environmental ecological governance or prior environmental restoration and post-landscape reconstruction,and taking into consideration the “resources” from the perspective of the entire life cycle."Recycling,restoration of the environment,and optimization of landscapes," a model for urban wasteland and rehabilitation.This thesis systematically constructs the scientific connotation and method of the model from the four aspects of the theoretical system,operating mechanism,technical means,and evaluation methods,and provides new ideas and solutions for urban wasteland management and transformation.This thesis combined with the author's direct participation in the Wuhan Garden Expo Garden project,provides demonstration cases and analysis and evaluation for the ERLRUW model,not only to verify the correctness of the model theory,but also to use the ecological environment and economic and social benefits.A large number of observations and evaluation results prove the feasibility of this model.The model is a scalable and reproducible modern urban wasteland environmental risk control and sustainable development model.The main contents include the construction of ecological restoration and landscape reengineering in urban wasteland and the empirical research.1.The ERLRUW modelThis thesis constructs a complete system of the ERLRUW model,which is divided into several parts: Theoretical system,operation mechanism,techniques and measures,and assessment mode.(1)Theoretical system of the ERLRUW model:Explaining that this model is based on the coupling mechanism of ecological restoration and landscape rehabilitation;clarifing the connotation of the model;The basic supporting points of this model are four: environmental capaurban,ecological structure of the landscape,sustainable utilization of the land and historical and cultural heritage.The main contents of this model include: resource recycling and development,environmental restoration and regeneration,cultural protection and remodeling,as well as the transformation and optimization of features.the characteristics of this model are mainly manifested in four aspects: diversification of objectives,diversification of functions,complexity of objects,and long-term process.(2)Operation mechanism of the ERLRUW model: The goal of the proposed model is to diversify and coordinate the goal,The operating mechanism is a multi-party cooperation mechanism led by government agencies,enterprises,social organizations,and the public.The operation strategy of the model is coordination of multi-dimensional control,integration of multiple views,consolidation of multiple regulations,and combination of multiple methods.The operation process of the model includes the investigation,analysis,evaluation,decision-making,project design,engineering construction and management control should be adopted.(3)Techniques and measures for ERLRUW model: The ecological landscape elements of urban wasteland characteristic as the basis,there are 7 types of ERLRUW techniques: soil pollution control and remediation,landform,vegetation restoration and reconstruction method design,water remediation and reconstruction,road planning,environmental restoration and waste reuse,building repairing and reconstruction.(1)The control and remediation of soil pollution: Site pollution problems,technical attributes,technical methods,technical goals,etc.(2)The rebuilding methods of landform include ecological functions and landscape effects,methods and methods of reengineering,,the particularity of landform and landform rebuilding of different types of urban wasteland.(3)The phytoremediation and design of plants are mainly about the mechanism of phytoremediation,the landscape function of plants,Technical key points,technical methods,etc.(4)The restoration of water system and reconstruction of water bodies.Technical content(water restoration,rainwater collection and reclaimed water reuse,wetland regeneration and waterscape construction);Technical goals(recovering the ecological health of water bodies,rational use of water resources,creating landscapes,improving the environment,and beautifying the environment).(5)The restoration and planning of roads.Technical goals(construction of ecological corridors and Landscape skeleton);Technical methods(retention and reuse,redesign,etc.).(6)Environmental waste treatment.pollution type(divided into severe type,lighter type);non-pollution type(direct retention,processing and utilization);(7)The main methods of building restoration.Technical measures(functional replacement,spatial reconstruction,styling remodeling);methods and means(demolition and reconstruction,retention,and update).(4)Evaluation of the ERLRUW model: This thesis proposes that the evaluation method of this model is a comprehensive evaluation method that includes environmental impact assessment,landscape effect analysis,and comprehensive benefit evaluation.The mode of environmental impact assessment of this model should be carried out from three aspects: early environmental impact assessment,environmental impact assessment of completion acceptance,and follow-up evaluation.The purpose of this model is to analyze the landscape effect in order to correctly understand the landscape environment conditions and quality changes in the study area.The comprehensive benefit evaluation of this model is the analysis of the overall target benefits;the sub-item analysis of economic benefits,social benefits,ecological benefits,and landscape benefits;and the comprehensive benefit analysis system consisting of individual benefit analyses.2.Empirical researchThe Wuhan Garden Expo project in which the author was actively involved was used as a case study to demonstrate the feasibility of the proposed ERLRUW model.The Wuhan Garden Expo project is a typical urban wasteland management and renovation project with transformation of objectives and diversified functions,along with transformation of objects and complex process.(1)Operation mechanism.From the analysis of the project's operational objectives,operating dominance,operational strategies,and engineering processes,the smooth operation of the entire project fully validates the operability of the operating mechanism of the ERLRUW model proposed in this thesis.(2)This article combines the author's own actual operation and participation and analyzes the technical means of the project,including the Jinkou landfill disposal,the landscape pattern and ecological repairing,site planning and layout structure,water purification and sponge park,plant planning system,the road traffic system,the transformation of waste system,and main building system.The success of the technical means fully validates the feasibility of the technical means of the ERLRUW model.(3)This article carrieds out the investigation and evaluation of various ecological and environmental indicators of the site before and after the completion of the project,and verifies the effectiveness of the model in terms of ecosystem and environmental rehabilitation.It verified the environmental restoration effect of this model through comparison analysis of the measured data of ambient air,water environment,acoustic environment,groundwater environment,soil environment,and ecological environment at different stages of the project.According to the investigation and analysis of the ecological environment factors at different stages of engineering,the pollutant discharge concentration in the site accords with the relevant national emission standards.According to the measured data comparison and analysis of air environment,water environment,acoustic environment,groundwater environment,soil environment at different stages of the construction,pollutant monitoring value,water quality monitoring index,soil heavy metals index has improved significantly,and reached the relevant technical standards,the effect of environment remediation is very obvious.Landscape contrast and analysis before and after the construction,the overall visual quality and the basic visual elements of the landscape quality increased by 91% and 133% respectively,and the landscape quality is greatly improved.Through the evaluation of the comprehensive benefit of the project,the score of comprehensive benefit evaluation is 88,and the comprehensive benefit is excellent.The research work of this thesis was interdisciplinary,involving disciplines of environmental science and engineering,landscape design,ecology,resource and environmental economics.The proposed the ERLEUW model is a best matching method combining the three aspects of urban environmental improvement,sustainable utilization of resources and rehabilitation of cultural landscape.It can not only solve the “chronic disease” threatening sustainable development of urban waste land,but provide a new model and approach to achieve the goals of risk control and sustainable development model.