Mr. Deying Li Profile

Deying Li

at Beijing Univ of Civil Engineering and Architecture

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Publications (4)

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Proceedings Article | 16 October 2009 Paper

Design and application analysis of prediction system of geo-hazards based on GIS in the Three Gorges Reservoir

Deying Li, Kunlong Yin, Huaxi Gao, Changchun Liu

Proceedings Volume 7492, 749239 (2009) https://doi.org/10.1117/12.837229

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Although the project of the Three Gorges Dam across the Yangtze River in China can utilize this huge potential source of hydroelectric power, and eliminate the loss of life and damage by flood, it also causes environmental problems due to the big rise and fluctuation of the water, such as geo-hazards. In order to prevent and predict geo-hazards, the establishment of prediction system of geo-hazards is very necessary. In order to implement functions of hazard prediction of regional and urban geo-hazard, single geo-hazard prediction, prediction of landslide surge and risk evaluation, logical layers of the system consist of data capturing layer, data manipulation and processing layer, analysis and application layer, and information publication layer. Due to the existence of multi-source spatial data, the research on the multi-source transformation and fusion data should be carried on in the paper. Its applicability of the system was testified on the spatial prediction of landslide hazard through spatial analysis of GIS in which information value method have been applied aims to identify susceptible areas that are possible to future landslide, on the basis of historical record of past landslide, terrain parameter, geology, rainfall and anthropogenic activity. Detailed discussion was carried out on spatial distribution characteristics of landslide hazard in the new town of Badong. These results can be used for risk evaluation. The system can be implemented as an early-warning and emergency management tool by the relevant authorities of the Three Gorges Reservoir in the future.

Proceedings Article | 3 February 2009 Paper

Experimental investigation of top lighting and side lighting solar light pipes under sunny conditions in winter in Beijing

Yanpeng Wu, Rendong Jin, Deying Li, Wenming Zhang, Chongfang Ma

Proceedings Volume 7157, 71571O (2009) https://doi.org/10.1117/12.811992

KEYWORDS: Light sources and illumination, Solar energy, Diffusers, Buildings, Sun, Diamond, Solar radiation, Automatic tracking, Roads, Energy efficiency

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Natural light is very important element in the quality of vision. Solar light pipes are effective method to induce sunlight into the room need to be illuminated especially for corridor, some places natural sunlight cannot arrive. Solar light pipes are also effective ways to reduce electricity consumption for lighting; it can transmit sunlight from outdoor to the room without generating excessive heat. The performance of two top lighting solar light pipes and one side lighting solar light pipe were investigated at the same time under sunny conditions in winter in Beijing. The results showed that side lighting solar light pipes have better performance than that of top lighting one. Side lighting light pipe has better performance than top lighting light pipe if there are no shelters around the top dome under sunny conditions in winter in Beijing. Solar altitude is the main reason to give an effect on the performance of light pipes. The experimental results also showed that top lighting solar light pipes with "snow type" diffuser has better performance compare with the "diamond type" one. Solar azimuth can also affect the illuminance for whole day to all solar light pipes. So if the sunlight collector can following with the sun, this problem can be resolved, that is, automatic sun trackers are needed, but the cost will become too much at the same time. Different regions and different seasons had to select different types of solar light pipes to achieve maximum output of illuminance in the room. Design of the solar light pipes must adjust measures to local conditions. Solar light pipes will be popularized in the near future in China because have many advantages to improve energy efficiency in buildings.

Proceedings Article | 3 February 2009 Paper

Thermographic method for evaluation of thermal influence of exterior surface colour of buildings

Yanpeng Wu, Deying Li, Rendong Jin, Li Liu, Jiabin Bai, Jianming Feng

Proceedings Volume 7160, 716037 (2009) https://doi.org/10.1117/12.812017

KEYWORDS: Buildings, Thermography, Thermal effects, Infrared radiation, Infrared imaging, Energy efficiency, Temperature metrology, Solar energy, Solar radiation, Roads

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Architecture colour is an important part in urban designing. It directly affects the expressing and the thermal effect of exterior surface of buildings. It has proved that four factors affect the sign visibility, graphics, colour, lighting condition and age of the observers, and colour is the main aspect. The best method is to prevent the exterior space heating up in the first place, by reflecting heat away room the exterior surface.The colour of paint to coat building's exterior wall can have a huge impact on energy efficiency. While the suitable colour is essential to increasing the energy efficiency of paint colour during the warm summer months, those products also help paint colour efficiency and reduce heat loss from buildings during winter months making the interior more comfortable all year long. The article is based on analyzing the importance of architecture color design and existing urban colour design. The effect of external surface colour on the thermal behaviour of a building has been studied experimentally by Infrared Thermographic method in University of Science and technology Beijing insummer.The experimental results showed that different colour has quietly different thermal effect on the exterior surface of buildings. The thermal effect of carmine and fawn has nearly the same values. The main factor which is color express, give some suggest ting about urban color design. The investigation reveals that the use of suitable surface colour can dramatically reduce maximum the temperatures of the exterior wall. Keywords: architectural colour, thermal, thermographic

Proceedings Article | 29 December 2008 Paper

Application of GPS monitoring data in landslide prediction

Deying Li, Kunlong Yin, Lixia Chen, Wenming Chen

Proceedings Volume 7285, 72854S (2008) https://doi.org/10.1117/12.811371

KEYWORDS: Landslide (networking), Global Positioning System, Failure analysis, Data modeling, Lithium, Data analysis, Kinematics, Statistical analysis, Earth sciences, Control systems

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In recent years, the Global Positioning System (GPS) techniques have been widely applied to monitor the superficial movements of landslides. The main objective of this paper is to ascertain the application of GPS in landslide prediction practice, taking Baishuihe landslide as an example. The 1260 Mm³ Baishuihe landslide (Three Gorge Reservoir, China), susceptible to evolve into a soil slide, is studied. This landslide has been periodically monitored since 2003 with GPS and other conventional equipments. Influencing factors have been recognized through the analysis of the GPS monitoring data. Forecasting the failure of the landslides is difficult because of nonlinear time dependency and seasonal effects, which affect the displacements. According to Crosta's method, Voight model is suggested to forecast fictitious failures and to assess alert velocity thresholds using GPS monitoring data. Voight's equation has been expressed in terms of displacement and used to fit the data by nonlinear estimation techniques. Velocity threshold values have been computed and be used for emergency management by assuming these parameters (α, Α, τ, f, mechanical behaviour of the landslide mass approaching failure.

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