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Urban flood adaptation and optimization for net-zero: Case study of Dongjak-gu, Seoul

JOURNAL OF HYDROLOGY-REGIONAL STUDIES 2022年 41卷

作者： Kim, Jaekyoung Lee, Jihoon Hwang, Soonho Kang, Junsuk Seoul Natl Univ Interdisciplinary Program Landscape Architecture Seoul 08826 South Korea Seoul Natl Univ Transdisciplinary Program Smart City Global Conver Seoul 08826 South Korea Seoul Natl Univ Dept Landscape Architecture & Rural Syst Engn Seoul 08826 South Korea Seoul Natl Univ Univ Illinois Urbana Champaign Res Inst Agr & Life Sci Dept Agr & Biol Engn IL61801 Seoul 08826 South Korea

Study region: Sangdo-dong, Dongjak-gu, which is classified as inland water disaster risk zone within Seoul, Republic of Korea. Study focus: This study evaluated the amount of flooding that could occur in the carbon-neutral era, and optimized low-impact development (LID) technology for an urban flood adaptation. The optimal scenario of LID technologies was proposed for the Sangdo-dong area at the urban level, and the amount of runoff and flood reduction was evaluated. New hydrological insights: The LID controls provided by the storm water management model were used to analyze the flood damage that may occur under RCP 2.6 scenario. The evaluation simulated eight combinations of three optimized techniques: green roofs, permeable pavements, and vegetative swales to construct evidence-based data for the use by decision makers. In Scenario 8, which was evaluated as the most efficient, both peak and total flooding could be reduced by 55-60% respectively. This study not only evaluate the runoff but also the flooding value reflecting the interactions among LID-pipe networks. The LID installation area and runoff damage scale are inversely proportional. In contrast, as total flooding considers the capacity of the sewage network, a non uniform graph can be seen compared to the runoff. Results of this study can be used as guidance for LID evidence-based design and construction as well as strategies for decision maker.

关键词： Hydrology LID-pipe network Climate change scenario Net-Zero RCP 2 6 Storm water management

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Developing a Three-Dimensional Urban Surface Model for Spatiotemporal Analysis of Thermal Comfort with Respect to Street Direction

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SSRN 2022年

作者： Yun, Seok Hwan Lee, Dong Kun Piao, Zheng Gang Park, Chae Yeon Kim, Sang Hyuck Kim, Eun Sub Interdisciplinary Program in Landscape Architecture Seoul National University Seoul08826 Korea Republic of Integrated Major in Smart City Global Convergence Program Seoul National University Seoul08826 Korea Republic of Department of Landscape Architecture and Rural System Engineering Seoul National University Seoul08826 Korea Republic of Social Systems Division National Institute for Environmental Studies 16-2 Onogawa Ibaraki Tsukuba305-8506 Japan

Understanding the urban heat problem, which is intensifying owing to urbanization and climate change, has become a great challenge. Evaluating the thermal environment of urban spaces and predicting changes based on urban planning are essential for developing optimal urban cooling plans. Models using numerical methods are efficient and flexible for accurately simulating thermal comfort in various spatial arrangements in urban areas. In this study, we developed a three-dimensional urban surface model to evaluate the thermal comfort of humans by reflecting complex urban environments. We analyzed the thermal comfort according to the angular change of east–west streets, which are vulnerable to heat, and found that a change of 12.5° has a significant effect on the heat felt by the person on the sidewalk. The results suggest that spatiotemporal thermal comfort simulations considering the orientation of the streets and analytical planning are necessary to efficiently cool the city. This model can be used to develop efficient cooling strategies to achieve sustainable cities. © 2022, The Authors. All rights reserved.

关键词： Thermal comfort

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Examining the effects of residential self-selection on internal and external validity: an interaction moderation analysis using structural equation modeling

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TRANSPORTATION LETTERS-THE INTERNATIONAL JOURNAL OF TRANSPORTATION RESEARCH 2019年第5期11卷 275-286页

作者： Gim, Tae-Hyoung Tommy Seoul Natl Univ Grad Sch Environm Studies Interdisciplinary Program Landscape Architecture & Environm Planning Inst Seoul South Korea

Empirical studies on the land use-travel relationship have begun to consider the confounding or moderating effect of residential self-selection on the relationship. The studies were mainly focused on how to control for selection bias in relation to its threat to internal validity, but the bias also harms external validity through its interaction with explanatory variables. This study further considers this interaction moderation using partial least squares structural equation modeling, which compared to its covariance-based counterpart, can easily specify a large number of interaction indicators and include both reflective (compact land use) and formative (life situation inclined to automobile travel) constructs. Tested in Seoul, South Korea, structural equation models find that a considerable proportion of the land use effect on travel time is attributed to the self-selection. Regarding the interaction moderation, it turns out to significantly affect external validity: in a study area with more automobile-inclined residents than Seoul, compact land use may exert a stronger effect on automobile travel reductions and transit travel increases.

关键词： Residential self-selection validity interaction moderation structural equation modeling

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Considerations for Encouraging Citizen Participation by Information-Disadvantaged Groups in Smart Cities

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SUSTAINABLE CITIES AND SOCIETY 2022年 76卷 103437-103437页

作者： Jang, Seok-gil Gim, Tae-Hyoung Tommy Seoul Natl Univ Grad Sch Environm Studies Gwanak Ro 1Bldg 82Room 222 Seoul 08826 South Korea Seoul Natl Univ Interdisciplinary Program Landscape Architecture Grad Sch Environm Studies Seoul South Korea Seoul Natl Univ Environm Planning Inst Seoul South Korea

The emergence of a 'digital divide' has recently emerged as a key inequality issue, with the overall digital transformation of urban infrastructure and services through technological innovation. In particular, smart cities have the potential to limit participation opportunities for information-disadvantaged groups in decision-making by their optimized use of ICT in infrastructure and service delivery. Until now, studies on citizen participation in smart cities have mainly focused on the participation characteristics of general citizens. Thus, this study categorizes the key considerations for encouraging the participation of information-disadvantaged groups in smart cities and analyzes the difference in the relative importance between types using a series of Delphi surveys to collect the opinions of smart city experts in South Korea. The findings show that service accessibility is significantly important in encouraging participation, while the calculation of appropriate service cost and developing a support plan for service delivery are paramount in improving service accessibility. Furthermore, financial support for reducing the digital divide and citizens' understanding of the purpose of participation for increasing participative receptivity are found to be statistically significant.

关键词： smart city citizen participation information disadvantaged groups digital divide participative receptivity service accessibility

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Sociocultural factors of the late Ming and early Qing Chinese garden landscape, based on philosophies seen in Yuanye, Zhangwuzhi, and Xianqingouji

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landscape RESEARCH 2019年第2期44卷 174-185页

作者： Yun, Jiayan Kim, Joonhyun Seoul Natl Univ Interdisciplinary Program Landscape Architecture Seoul South Korea

This study explores garden landscape design philosophies during the Ming-Qing transitional period in China as presented in three different garden design books: Zhangwuzhi ( ), Yuanye ( ), and Xianqingouji ( ). During this period, the Confucian hierarchical social system fractured as the merchant class began to encroach on high society. In reaction to this change, Zhangwuzhi proposed the 'elegant' garden design ideology to maintain the cultural hegemony of the gentry. Reflecting the rising social status of merchants, Yuanye applied this ideology to the gardens of the merchant class. In early Qing, as commoners' ownership of gardens increased, Xianqingouji optimised the 'elegant' ideology, and introduced it as a practical design for ordinary citizens' gardens. In sum, all three books applied the 'elegant' ideology to garden landscapes of different classes in response to the social changes of the time.

关键词： Chinese garden philosophy commercialised garden landscape Confucian social hierarchy class consciousness

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Multi-objective planning model for urban greening based on optimization algorithms

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URBAN FORESTRY & URBAN GREENING 2019年 40卷 183-194页

作者： Yoon, Eun Joo Kim, Bomi Lee, Dong Kun Seoul Natl Univ Interdisciplinary Program Landscape Architecture Seoul 08826 South Korea Seoul Natl Univ Dept Landscape Architecture & Rural Syst Engn Seoul 08826 South Korea

Green space is fundamental to the quality of life of residents, and as such, urban planning or improvement projects often include strategies directly or indirectly related to greening. Although green space is well established to generate positive effects such as cooling, runoff reducing, and ecological corridor, a few studies have examined the comprehensive process of greening in the urban planning context. To fill this gap in the literature, this study seeks to identify a planning model that determines the location and type of greens based on its multiple effects (e.g., cooling and enhancement of connectivity) and calculates the implementation cost using meta-heuristic optimization algorithms. We obtained 30 Pareto-optimal plans by applying our model to the hypothetical landscape at a neighborhood scale. The results showed a synergistic relationship between cooling and enhancement of connectivity, as well as a trade-off relationship between greenery effects and implementation cost. We also defined critical lots for urban greening that are commonly selected in various plans. We expect our model to contribute to the improvement of existing planning processes by repeating the positive feedback loop: from plan modification to quantitative evaluation and selection of better plans. These optimal plans can also be considered as options for "co-design" by related stakeholders.

关键词： Neighborhood scale Cooling effect Connectivity Implementation cost NSGA II

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Natural Reality:Connecting the Cinematic landscape Panorama to the Ideal Virtual landscape:Focused on the Seoyeon's House,from the Korean Movie "architecture 101"

Natural Reality:Connecting the Cinematic Landscape Panorama ...

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第17届中日韩风景园林学术研讨会

作者： Tae Kyung(James)Kwon Kyung-Jin Zoh Interdisciplinary Program in Landscape Architecture & Global Smart city engineering GSES Seoul National University Graduate School of Environment Studies Seoul National University

The landscape is the ideal picture and pursuit of ***,now,we're living in the very fatal unhealthy era of corona *** makes us very difficult to create a cultural space in public,although each nation pursuing dramatic changes in the short term to make people enjoy their daily life back with the beautiful landscape in their natural *** to IT technology,we could create many virtual reality worlds,and it has been recognized very well on many ***,Virtual landscape is the best substitute of the real landscape for an ideal life,but the limitation was the cost and time since it has needed many graphic artists and rendering time using the expensive GPU built in Graphic *** this study,using virtual reality technology,an attempt was made to put "Seoyeon's house" in Jeju Island from the beautiful cinematic panorama in the real world,the main stage of the famous Korean movie "architecture101",and the movie in a virtual *** an attempt to build a virtual cultural park with minimal cost and designers,and to install various sounds and images that are pursued in a cultural environment not by only considering the audience' eyes but also for their ears and emotional mind,breaking away from the existing planting at the site,exhibiting and displaying interior materials,***,the interaction was provided to users and various experiences were made in virtual *** want to call it "Natural Reality" against the term of "Virtual Reality".In particular,to minimize the existing 3 D modeling and graphics,which take a lot of time and cost,a high-definition 360 camera based on real world texture mapping was introduced,and by using images captured in the field,a higher real-time rendering speed and a sense of reality were given,and the optimal result was ***,through this study,by demonstrating the function as a digital theme park that conveys the vivid appearance of the scene by absorbing all the interior and landscape of the scene in the future mov

关键词： Virtual Reality Spatial culture planning Cinema mixed landscape architecture Natural Reality

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Are decline-oriented strategies thermally sustainable in shrinking cities?

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URBAN CLIMATE 2021年 39卷 100924-100924页

作者： Jang, Gukhwa Kim, Saehoon Seoul Natl Univ Interdisciplinary Program Landscape Architecture Seoul South Korea Seoul Natl Univ Grad Sch Environm Studies Dept Landscape Architecture Urban Design Concentrat Seoul South Korea Seoul Natl Univ Smart City Global Convergence Seoul South Korea

Since the 20th century, shrinking cities have become a crucial subject in urban planning and public health literature. Given the growing concern about heat stress, a planning method for managing shrinking cities is increasingly linked with improvement of urban thermal comfort. The purpose of this study is to identify policy implications for developing so-called "decline-oriented strategies" that help to mitigate heat stress. The article assesses the effects of three strategies: 1) demolition strategy of abandoned houses, 2) demolition and greening the site strategy, and 3) small-scale urban renewal strategy. Using ENVI-met, we performed a comparative analysis of the differences in thermal comfort levels associated with each strategy. The results showed that the pre-post differences in thermal comfort were statistically significant for each strategy. Overall, the demolition strategy without greening elevated the surface temperature due to more extensive open areas without shade, forming a heat stress zone around vacant lots. The greening strategy partly offset the adverse effects of the demolition strategy by providing a thermally pleasant environment. Finally, the small-scale urban renewal strategy improved the thermal environment and provided a potential cooling zone, which pedestrians and residents could utilize.

关键词： Climate change Heat stress Outdoor thermal comfort Physiological equivalent temperature Smart shrinkage

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Phenological Analysis of Sub-Alpine Forest on Jeju Island, South Korea, Using Data Fusion of Landsat and MODIS Products

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FORESTS 2021年第3期12卷 286页

作者： Park, Sang-Jin Jeong, Seung-Gyu Park, Yong Kim, Sang-Hyuk Lee, Dong-Kun Mo, Yong-Won Jang, Dong-Seok Park, Kyung-Min Seoul Natl Univ Interdisciplinary Program Landscape Architecture 1 Gwanak Ro Seoul 08826 South Korea Natl Inst Biol Resources Biol Resources Res Dept 42 Hwangyeong Ro Incheon 22689 South Korea Seoul Natl Univ Dept Landscape Architecture 1 Gwanak Ro Seoul 08826 South Korea Yeungnam Univ Coll Life & Appl Sci Dept Landscape Architecture 280 Daehak Ro Gyongsan 38511 South Korea

Climate change poses a disproportionate risk to alpine ecosystems. Effective monitoring of forest phenological responses to climate change is critical for predicting and managing threats to alpine populations. Remote sensing can be used to monitor forest communities in dynamic landscapes for responses to climate change at the species level. Spatiotemporal fusion technology using remote sensing images is an effective way of detecting gradual phenological changes over time and seasonal responses to climate change. The spatial and temporal adaptive reflectance fusion model (STARFM) is a widely used data fusion algorithm for Landsat and MODIS imagery. This study aims to identify forest phenological characteristics and changes at the species-community level by fusing spatiotemporal data from Landsat and MODIS imagery. We fused 18 images from March to November for 2000, 2010, and 2019. (The resulting STARFM-fused images exhibited accuracies of RMSE = 0.0402 and R-2 = 0.795. We found that the normalized difference vegetation index (NDVI) value increased with time, which suggests that increasing temperature due to climate change has affected the start of the growth season in the study region. From this study, we found that increasing temperature affects the phenology of these regions, and forest management strategies like monitoring phenology using remote sensing technique should evaluate the effects of climate change.

关键词： phenological analysis spatiotemporal data fusion Landsat MODIS Jeju Island NDVI climate change

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Detecting spatial heat vulnerability in the city considering spatiotemporal population distribution: A focus on the elderly during daytime

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URBAN CLIMATE 2024年 56卷

作者： Lee, Seunghyun Lee, Jae Seung Kim, Saehoon Seoul Natl Univ Interdisciplinary Program Landscape Architecture Seoul South Korea Seoul Natl Univ Grad Sch Environm Studies Dept Environm Design Urban Design Concentrat Seoul South Korea Seoul Natl Univ Environm Planning Inst Seoul South Korea Seoul Natl Univ Integrated Major Smart City Global Convergence Seoul South Korea 1 Gwanak ro Seoul 08826 South Korea

Escalating heatwaves induced by climate change are giving rise to a range of health issues. Traditionally, government policies focus on residential vulnerability, neglecting dynamic population shifts during workday heat peaks away from their residences. This study explores the influence of spatiotemporal population dynamics on the distribution of heatwave damage. Utilizing the data from Seoul, South Korea between 2017 and 2019, we assessed the relative risk of emergency visits for heat-related illnesses during heatwaves across hospital service areas. A multilevel regression approach was employed to examine the contributions of daytime and residential populations of vulnerable groups, while controlling for established heat vulnerability indicators. The results revealed a significant correlation between the relative risk of heat-related emergencies and the proportion of the daytime elderly population. These findings suggest that the daytime population, as compared to the residential population, can better capture vulnerable areas and individuals in the context of an urban heatwave. Consequently, the study proposes that local heat response policies consider the dynamic locations of vulnerable populations.

关键词： Heatwave Heat vulnerability Daytime population Dynamic population Relative risk Huff model

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