Study On The Index System And Application Of Green Space Control For Detailed Planning Units For Thermal Mitigation

Urban green space is undergoing a new phase of renewal and development,focused on "revitalizing the stock and optimizing the increment." This approach emphasizes the creation of fine,multi-dimensional,and efficient ecological spaces,which presents new challenges for improving green space quality.The traditional approach of emphasizing quantity over quality in green space construction must be abandoned,and a smart optimization approach that improves both quantity and quality is needed.However,compared to urban construction land development,the planning and control of urban green space lack refinement and systematization,making it difficult to meet the demands for efficient green space development and ecological problem-solving.This paper uses surface temperature inversion to identify the urban heat island effect in Xi’an,especially in the built-up area.It clarifies the mechanism linking urban green space and the heat island effect through the "pattern-process-function" theory and previous studies,and reviews the role of urban green space in thermal environment mitigation using system theory and its hierarchy principle.A refined control index system for green space with the goal of heat island mitigation is developed,and the objects of the control index system are analyzed and screened using the theory of scale effect.Finally,the path of the green space control system in the built-up area of Xi’an is constructed and explored empirically in the context of detailed territorial spatial planning.This research comprises six chapters,with the first chapter serving as the introduction.In this chapter,the research background,object,typicality,purpose,and significance are clarified,along with the identification of shortcomings in existing plans and exploration of implementation paths for spatial control in urban built-up areas.The chapter concludes by outlining the research content,basic methods,and overall writing framework.Chapter 2 presents the research tools and technical lines,which analyze key scientific issues,such as the theory of ecosystem services,scale effects,and "patternprocess-function." These theories serve as the basis for the technical tools developed for this study,which include potential evaluation and control guidelines.Furthermore,the chapter proposes a research analysis framework and technical route based on the results of the previous review.Chapter 3 focuses on the construction of a green space control index system based on heat island reduction.The chapter explores the mechanism of urban heat island effects and their correlation with urban green space.Utilizing the pattern-process-function theory,the chapter constructs a control index system based on four aspects:overall scale,distribution pattern,geometric form,and plant configuration.Additionally,the chapter categorizes units and plots based on their scale.Chapter 4 analyzes the current situation of urban heat islands in Xi’an based on the detailed planning scale and proposes an application target selection framework for green space control indexes.Seven indicators are proposed based on the urgency of heat island management in potential sites and the social benefits of heat island management.Three control units and several control sites are then weighted.Chapter 5 is the empirical part,which discusses the control application after obtaining the control objects.The chapter follows the path of unit control guideline,detailed control guideline of parcels,integration of design strategy,and preparation of control guideline to comprehensively control the application objects.Finally,the chapter proposes an interface with the special spatial planning and detailed planning of the land and management mechanism based on the construction of a spatial control system.Chapter 6 serves as the conclusion and summarizes the key findings of the study.The main conclusions of this study include three points:①Propose a green space control index system for detailed planning units based on heat island reduction,involving 13 items in four aspects:overall scale,distribution pattern,geometric form and plant configuration.②The selection path of priority control units and parcels based on heat island reduction is proposed:through the two-part evaluation and selection of detailed planning units and potential parcels,three detailed planning units and potential parcels of each unit in Xi’an are analyzed.③Develop green space control guidelines for heat island reduction-oriented Xi’an city detailed planning units,and the control system consists of three parts:unit guidelines,plot details,and design strategies,and the final results are presented in the form of control guidelines.