News

LSGI and RILS co-organised a Training Course for the Lands Department

Prof. Qihao WENG, Associate Director of Research Institute for Land and Space (RILS) and Chair Professor of Geomatics and Artificial Intelligence of Department of Land Surveying and Geo-Informatics (LSGI), successfully launched a 3-day training course for the Lands Department on 18, 19 and 23 August 2022. The participants explored topics concerning remote sensing and machine learning, applied their professional knowledge and skills in the following lab exercises, and developed sense of solving remote sensing related issues in a deep learning fashion.  

RILS member received The InnoStars Award 2021

Prof. Kar-kan LING, Director of the Jockey Club Design Institute for Social Innovation of PolyU, was presented The InnoStars Award 2021, organised by the Our Hong Kong Foundation in the ceremony held on 29 July 2022. Prof. LING believed that the most important element for social innovation was empathy—to profoundly understand the pain and needs of those you served.  He also believed that improving the lives of the grassroots through innovative projects could influence government policy planning, raise government and public concerns on social problems, and stimulate social innovation from the bottom up. Click here for more details about the InnoStars Award Winners.

Management committee member of RILS received JSCE International Outstanding Collaboration Award

Ir Prof. Jian-guo DAI, management committee member of RILS and Professor of the Department of Civil and Environmental Engineering (CEE) of PolyU, received the FY2021 JSCE International Outstanding Collaboration Award from the Japan Society of Civil Engineers (JSCE). This award recognized the awardees’ continuous efforts and significant contribution to the development of concrete science and technology, the leadership and achievements in fostering the relationship among civil engineering researchers, as well as the commitment to strengthening the friendship between Japan and China through technical and cultural exchanges. Click here for more details about the JSCE awards.

RILS study examines the relationship between mobile app use and loneliness among Hong Kong’s elderlies during the pandemic

Dr Yi SUN, Member of the Research Institute for Land and Space (RILS) and Assistant Professor of the Department of Building and Real Estate at PolyU, and his research teammates have found that the pandemic, particularly the associated social distancing rule, has negative impacts on elderlies’ mental health and lifestyle. Studies also reveal that the use of mobile apps seems have positive effects on mitigating those negative changes in elderlies’ daily life. The project examines the relationship between mobile app use and loneliness among Hong Kong’s older adults during the pandemic. The team finds that the use of video entertainment, instant communication, and information apps is positively associated with lower emotional loneliness. However, their findings provide an insight with no relationship between mobile app use and social loneliness. This also contributes to a deeper understanding that the space, as well as its incorporated activities and social relations, is essential for people to develop positive interpersonal relations. Urban planning in the post-COVID era should consider both the quality and characteristics of various urban spaces in boosting social interactions and solidarity among citizens. The study has been published in International Journal of Environmental Research and Public Health at https://www.mdpi.com/1660-4601/19/13/7656

RILS scholar wins in the first round of Public Policy Research Funding Scheme 2022/23

The project led by our member, Dr Xiaolin ZHU, Assistant Professor of Department of Land Surveying and Geo-Informatics (LSGI), has been awarded a funding of HK$281,060 from the first round of the Public Policy Research (PPR) Funding Scheme, managed by the Policy Innovation and Co-ordination Office. This project is one of the only two projects receiving funds out of 27 applications.   Illegal dumping of construction and demolition (C&D) materials can lead to severe environmental issues (e.g., destroyed wetlands), life and property risks (e.g., landslide), hygiene problems (e.g., clogging waterways), public health hazards (e.g., breeding germs), and urban planning issues (e.g., seizing public lands). Illegal dumping has become the third-largest source of pollution complaints in Hong Kong since 2020. With the anticipated saturation of the landfills’ capacity, public concern for illegal dumping becomes even more intensive. Illegal dumping of C&D tends to be stealthy, concealed and scattered, making it difficult to track the activities over a large area. Therefore, the capability for detecting illegal dumping should be enhanced urgently to maintain a clean and healthy city environment and to construct a liveable and competitive city.   Dr ZHU’s project provides not only an overview of the suspicious illegal dumping activities in Hong Kong, but also an effective approach to deploy manpower optimally across the relevant government departments for illegal dumping management. The departments can also determine their responsibilities based on the geographical distribution of the illegal dumping activities and other complementary data, such as land use maps. This project will not only contribute to detection of occurrence of illegal activities for the early warning but also to assessment of recovery works after a site is destroyed by illegally deposited C&D, as an essential part of illegal dumping management.   Please click here for more information about the research reports under PPR Funding Schemes.

RILS interdisciplinary research study: Super-fast Large-area Economical Marine Reclamations for Housing and Infrastructural Developments in the Guangdong-Hong Kong-Macau Greater Bay Area

Led by Ir Prof. Jian-hua YIN, management committee member of RILS and Chair Professor of Soil Mechanics at the Department of Civil and Environmental Engineering (CEE), the research team has developed and implemented an innovative technique using horizontal band drains in the aid of vacuum preloading method to facilitate the possible reuse of dredged sediment as fill material in future reclamation projects in Hong Kong. Three physical model tests are ongoing in order to simulate the whole process of implementing the new soft soil improvement method, including the dredging process, self-weight consolidation process, and fast consolidation process by vacuum preloading with prefabricated band drains. The preliminary test results well proved that the new method is capable of decreasing water content and increasing soil strength in an efficient and economical way. For example, it can be observed in large-scale plane strain physical model that the average water content of dredged sediment decreased from 220% to 76% and the shear strength of sediment increased from almost zero to 27 kPa at the bottom of model within 100 days of applying vacuum pressure. As the following work, a mechanical-chemical combined method, which incorporates binder stabilization using industrial wastes and vacuum preloading with prefabricated band drains at the same time, will be further investigated to propose a sustainable way in the marine reclamation practice. A Hydraulic Laboratory visit and clay reclamation model test demonstration were hosted by Prof. YIN to Departmental Advisory Committee of CEE, led by Ir Chun-kit LAU, Ricky, JP, Permanent Secretary for Development (Works) of Development Bureau. Please click here for details.    

RILS members win awards at the Geneva Invention Expo

The Hong Kong Polytechnic University (PolyU) has remarkable results in this year’s online special edition of the International Exhibition of Inventions of Geneva (Geneva Inventions Expo). The Exhibition is regarded as one of the most important annual global events devoted exclusively to inventions. This year, three RILS members, Prof. Jianguo DAI, Prof. Daniel TSANG and Sr Prof. Charles WONG, won the awards, including one Gold Medal and two Silver Medals. For details of the awards, please refer to the table below or visit the website of PolyU Knowledge Transfer and Entrepreneurship Office: https://www.polyu.edu.hk/kteo/polyu-innovations/award/geneva2022/ and the event organiser’s official website: https://www.inventions-geneva.ch   Invention Principal Investigator Award UmiCool: an Eco-friendly Smart Sub-ambient Radiative Cooling (SSRC) Coating Prof. Jianguo DAI Management Committee Member of RILS Professor and Associate Head, Department of Civil and Environmental Engineering, Founder of Pro-Infra Science & Technology Limited (a PolyU Academic-led start-up) Gold Medal Carbon-negative Climate-smart Biochar Partition Block Prof. Daniel TSANG Member of RILS Professor, Department of Civil and Environmental Engineering, Founder of NeutralCrete Limited (a PolyU Academic-led start-up) Silver Medal Hong Kong Solar Irradiation Map Sr Prof.Charles WONG Management Committee Member of RILS Associate Dean (FCE) and Professor, Department of Land Surveying and Geo-Informatics  Silver Medal

RILS study helps policymakers develop flash drought mitigation and risk management strategies

Dr Shuo WANG, Member of the Research Institute for Land and Space (RILS) and Assistant Professor of the Department of Land Surveying and Geo-Informatics at PolyU, and his research teammates find that flash droughts do not appear to be occurring more frequently in most regions of the world, just coming on faster. Approximately 33.64−46.18% of flash droughts develop within 5 days for the period 2000−2020, and there is a significant increasing trend in the proportion of flash droughts with the 5-day onset time globally. Compared with traditional, slowly developing droughts, flash droughts evolve with a relatively fast depletion of soil moisture that may cause an imbalance of ecosystems and agricultural systems.   Flash droughts are most likely to occur in humid and semi-humid regions, including Southeast China, Southeast Asia, East Asia, Amazon Basin, Eastern North America, and Southern South American. Thus, the increasing flash drought risk is overlooked, without any early warning and emergency response measures, posing serious threats to ecosystem protection and sustainable agriculture development. Atmospheric aridity creates a perfect condition for the occurrence of flash droughts, and the joint influence of soil moisture depletion and atmospheric aridity further enhances the rapid onset of flash droughts. In other words, low soil moisture combined with high vapor pressure deficit accelerates the decline in soil moisture through land–atmosphere feedbacks. Thus, Southeast China with strong land– atmosphere coupling is most vulnerable to flash droughts.   The new study contributes to a deeper understanding of the rapid onset development and driving mechanism of flash droughts. Identification of flash drought-prone regions and global hot spots can help policymakers and stakeholders develop flash drought mitigation and risk management strategies. Furthermore, comprehensive assessment of onset development timescales of flash droughts provides insights into the implementation of flash drought forecasts and early warning systems.   The study has been published in Nature Communications at https://doi.org/10.1038/s41467-022-28752-4

Research projects led by RILS members received ECF funding in 2021-22 exercise

Two research projects led by RILS members, Sr Prof. Charles WONG and Dr Shuo WANG, received over HK$2.4 million funding in total from the Environment and Conservation Fund (ECF) in the 2021-22 funding exercise. The ECF was set up by the Government in 1994 for funding educational and research projects on environmental and conservation matters. Research and Technology Demonstration Projects awarded by the ECF will contribute in a direct and practical way towards environmental improvement and conservation of the local environment, or promote and encourage adoption of green technologies in Hong Kong.   Research project Project Coordinator (PC) Amount awarded A multi-source remote sensing based technique for monitoring oil spills  Sr Prof. Charles WONG HK$1,920,520 Climate-resilient planning and design for coastal stormwater drainage systems Dr Shuo WANG HK$490,600

RILS and RISUD researchers discovered a smog-aggravating chemical in Hong Kong’s air

Ozone (O3) is an air pollutant that causes eye irritation and respiratory diseases. Despite improvement of overall air quality in Hong Kong in recent years, high concentrations of ozone remain a serious problem in the city. Ozone at ground level is produced by chemical reactions involving volatile organic compounds (VOCs) and oxides of nitrogen (NOx) in the presence of sunlight. The production of ozone is initiated and sustained by radicals – highly reactive oxidants; the conventional radicals are OH, HO2 and RO2 (collectively called ROx radicals). In a field study at a coastal site in Hong Kong, a team of researchers from the Research Institute for Land and Space (RILS) and the Research Institute for Sustainable Urban Development (RISUD) discovered unprecedented concentrations of molecular chlorine (Cl2) during the autumn when ozone pollution reaches its annual peak. Cl2 was previously known to destroy ‘good ozone’ at high altitudes over the Antarctic, thus allowing cancer-causing ultra-violet sunrays to reach the Earth’s surface. In polluted areas, however, Cl2 can be a ‘new’ radical source of ozone that harms human health and vegetation. In collaboration with international scientists, the field study team found that the high Cl2 concentrations are caused by the interaction of man-made pollutants (NOx and acidic chemicals) with natural sea-spray particles. This pollution pathway is important not only for Hong Kong but also for other coastal cities and for other pollutants like PM2.5. The team’s findings can be used to adjust or refine measures that reduce ozone pollution. The study results were published recently in Nature Communications. The first author is Dr Xiang PENG, who was a PhD student at the time of this study, and the corresponding author is Prof. Tao WANG, Member of RILS and RISUD and Chair Professor in the Department of Civil and Environmental Engineering (CEE). Other contributing authors include Ir Prof. Hai GUO (Management Committee Member of RILS), Prof. Shuncheng LEE, and additional PhD students and researchers from CEE, personnel from the Hong Kong Environmental Protection Department, and scientists from the US, France, Spain, Sweden, Germany and mainland China. The study was supported by funding from the Hong Kong Research Grants Council, the Agence Nationale de la Recherche, the Swedish Research Council, and the European Research Council.