Identifying the layers and components affecting the ecological urban design in the water bed of the urban edges; Case Study: Small Arvand River

Urban design in the last decade is based on ecological and environmental paradigms; In such a way that planning and organizing human settlements without considering environmental issues and ecological balance is considered incomplete. But the important issue among these is the role of natural organs, especially the water on the sides in urban spaces and how to design an ecological city and explain its various dimensions by professionals. In this article, an attempt has been made to examine the effective layers and criteria in ecological urban design in the water bed of the urban edges, the explanation and priority of each of the layers and criteria compared to the studied sample from the point of view of experts and specialists related to the subject. take The research method of "descriptive-comparative" type was based on the study of the documents of the existing theories and the comparison of different theories in the relevant field along with observation and field survey in the Arvand Koch river bed. Also, in order to analyze the theoretical framework of the research and analyze the findings, the hierarchical analysis process model and Expert Choice software have been used. Based on the results and findings of the research, ecological urban design in the water bed of the city sides can be classified from two substantive and procedural dimensions, the substantive dimension consists of 6 layers of land, water structure, movement and access (communications), space Open and green, the neighborhood unit (blocking and segmentation) and the building and details layer (green infrastructure) are formed with different sub-criteria. The researches show that the impact and importance of the water structure layer is the first priority and the building and details layer (green infrastructure) along with the procedural dimension is the last priority in the ecological urban design in the small Arvand river bed, which is using Criteria related to the water structure layer such as organization, control, storage and reuse of surface water, health and cleanliness of water resources, waterways and water bodies, optimal use of water in the urban landscape, etc. and paying attention to the criteria Other layers can be used in order to maintain and improve the natural environment.