When a public health emergency occurs, a potential sanitation threat will directly change local residents’ behavior patterns, especially in high-density urban areas. Their behavior pattern is typically transformed from demand-oriented to security-oriented. This is directly manifested as a differentiation in the population distribution. This study based on a typical area of high-density urban area in central Tianjin, China. We used Baidu heat map (BHM) data to calculate full-day and daytime/nighttime state population aggregation and employed a geographically weighted regression (GWR) model and Moran’s I to analyze pre-epidemic/epidemic population aggregation patterns and pre-epidemic/epidemic population flow features. We found that during the COVID-19 epidemic, the population distribution of the study area tended to be homogenous clearly and the density decreased obviously. Compared with the pre-epidemic period: residents’ demand for indoor activities increased (average correlation coefficient of the floor area ratio increased by 40.060%); traffic demand decreased (average correlation coefficient of the distance to a main road decreased by 272%); the intensity of the day-and-night population flow declined significantly (its extreme difference decreased by 53.608%); and the large-living-circle pattern of population distribution transformed to multiple small-living circles. This study identified different space utilization mechanisms during the pre-epidemic and epidemic periods. It conducted the minimum living security state of an epidemic-affected city to maintain the operation of a healthy city in the future.

The growing demographic dividend is declining worldwide due to global population shrinkage. However, with the enhancement of spatial connection, industry-oriented population flow is becoming more and more active. The floating demographic dividend will bring new opportunities to regional development. Population flow has become an important field of urban research. We selected the Beijing-Tianjin-Hebei urban agglomeration as the study area and conducted the study of the interaction relationship between population flow and industry space supply. Considering that it takes time for space supplies to be industrial entities and then to affect population flow, this study built a fixed-effects model with annual space supply and “t + 1” population flow to perform regression analysis. The main findings of the research can be concluded as below. The regional population flow was mainly rural population and floated mainly to rural areas. It is difficult to complete the urbanization of floating population through land urbanization due to China’s household registration system. The population flow is sensitive to industry space supply and its spatial development conditions. As the study area is an important global urban agglomeration and China’s political, economic, and cultural center, its regional population flow is representative and typical. Guiding its population flow to form a coordinated spatial and social network can provide scientific support for regional industry space supply and allocation, and can provide a reference for the development of other urban agglomerations.

The representational image of the city has attracted people’s long-term attention. Nevertheless, the mechanism of interaction between the image and the built environment (BE) and image studies at the town scale have not been fully explored. In this study, we collected multi-source data from 26 characteristic towns in Tianjin, China. We explored a deep learning approach to recognize social media data, which led to the development of quantifiable town uniqueness image (UI) variables. We studied the influence of the BE on the town UI and the moderating effects of positive emotions on the relationship between the two. The results showed that positive emotions had significantly positive moderating effects on the water system ratio’s effect on UI, but weakened sidewalk density and tourist attraction density. They also inhibited the negative effects of road connectivity but could strengthen the negative effects of the sky view factor and points of interest (POI) mix. The moderating effects on other variables are relatively mediocre. This study helps to reveal the inner mechanism of BE and town image. It is conducive to accurately coordinating the relationship between planning policies and design strategies, optimizing resource allocation, and promoting sustainable town development.

Parametric Design has aroused the innovation in the architectural form creation, space conception and technology conception as a sort of new thinking mode. Coming along with this situation, architectural aesthetics has already started a new step in the influence of parametric design. Using the basic principles of philosophy, aesthetics, information technology, from the Multidimensional Vision systems theory, information theory, behaviour psychology, philosophical thinking and logical induction dual perspective of parametric architectural beauty philosophical connotation, aesthetic principles, aesthetic value and artistic regularity analysis, so as to construct a theoretical framework parameterized Aesthetics. Proposed integrity and process, interaction with equality and pluralism and individuality is an important aesthetic value principle parametric architectural aesthetics. And from complex parametric building phenomenon, summed parametric architectural aesthetics content evolution include: aesthetic dimension in the form of expansion of the connotation of spatial variation in the type of aesthetic and technical aesthetics extend and so on. Expanding the creative vision of today's architectural and aesthetic theory could provide new ways of thinking, and provide a theoretical basis for aesthetic parametric building program evaluation.

Ensuring equitable and inclusive access to children’s extracurricular activity facilities represents a profound manifestation of educational equity and is crucial for promoting children’s holistic development and societal sustainability. However, the underlying spatial mechanisms shaping their equity remain insufficiently explored. Using Tianjin’s central urban area as a case study, this study examines the spatial accessibility and equity of such facilities under dual government–market provision systems. The multi-mode Huff two-step floating catchment area model (MM-Huff-2SFCA) was employed to assess accessibility across walking, e-bike, public transport, and private car modes, integrating facility quality, household preference, and time-based distance decay. Equity was further evaluated using Lorenz curves and Gini coefficients across multiple spatial scales, while geographically weighted regression (GWR) identified spatial heterogeneity in factors such as child population density, transport infrastructure, household economic status, and basic education coverage. Results indicate that macro-level spatial balance masks substantial micro-scale inequities, particularly among transport-disadvantaged groups. Government and market systems exhibit contrasting spatial logics, forming a compensation–complementarity pattern across urban space. These findings underscore the need for refined and differentiated governance in extracurricular activity facilities planning, integrating spatial planning, transport accessibility, and social equity to advance child-friendly urban development and equitable public service provision.

Land-sea integration is the core value orientation for the synergistic utilization of terrestrial and marine space and resources in China. To construct a coastal human settlement environment system featuring human-land (sea) interaction under the multidimensional goals of land-sea integration, this paper proposes the concept of the "Key Zone of Land-Sea Integration" and its spatial structure of "supporting zone-core zone-associated zone-hinterland zone". The Key Zone of Land-Sea Integration implements the research perspective of the coastal human settlement environment system in terms of scope definition, hierarchical structure, research priorities, and development dimensions. It follows the research approach of "spatial structure-geomorphic pattern-ecological network-human settlement order", couples the multidimensional values of "ecology-economy-space-culture-society", and puts forward key research issues. Specifically, in scope definition, it clarifies the spatial scope integrating land and sea, covering both coastal areas and their adjacent terrestrial and marine extensions. In hierarchical structure, it establishes a multi-level system to adapt to analyses and management at different scales. In research priorities, it focuses on the dynamic interactions between human activities and the natural environment within the zone. In development dimensions, it emphasizes the balance among economic growth, social progress, and ecological protection. Focusing on the integration of human-land (sea) interaction and the integration of land-sea multidimensional values at the urban scale from the perspective of the coastal human settlement system environment, the Key Zone of Land-Sea Coordination proposes clear spatial objects and carriers. It will further promote the integration of land-sea coordinated territorial spatial planning and governance, break down traditional barriers between land and sea management, and facilitate high-quality development of coastal human settlement by guiding rational spatial layout, efficient resource utilization, and harmonious coexistence between human and nature. Thus, it provides theoretical support and practical guidance for advancing systematic management of coastal areas and optimizing the sustainable development pattern of coastal human settlement.