Mr. Juan Dai Profile

Juan Dai

at China Univ of Geosciences

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Publications (2)

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Proceedings Article | 16 October 2009 Paper

Dynamic modeling of tourism by stochastic method: a case of the Beijing-Tianjin-Hebei region

Juan Dai, Shihui Zhang, Chongsheng Xue

Proceedings Volume 7492, 74925D (2009) https://doi.org/10.1117/12.838634

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As an efficient way to stimulate the growth of economy, tourism is promoted by most counties allover the world, and has become one of the world's largest and fastest-growing industries. Essentially, tourism is a spatiotemporal system, with tourist attractions located in different geographic areas and tourist flows exchanging between different geographic regions. In this paper, we present a dynamic model for the simulation of tourism and tourist's activities in the context of GIS and stochastic method, using a case of the Beijing-Tianjin-Hebei region. The model is developed on stochastic method and multiple geospatial data sources. In the model, the spatiotemporal behavior of tourist on the Earth's Surface is governed by the evolution rules, which are extracted from the researches on tourist's activities and executed via stochastic method and multiple geospatial data. By means of the model, we simulate the tourism in the Beijing-Tianjin- Hebei region, and find that there is good correspondence between the tourist arrivals calculated with the model and those obtained from the tourism statistics. This shows that the animated dynamic modeling of tourism based on geospatial data can be used as an indicator of the tourism in the realistic world, and is also can be embedded in the GIS applications.

Proceedings Article | 10 October 2009 Paper

Dam-break flood modeling for Tangjiashan Quake Lake

Juan Dai, Shihui Zhang, Chongsheng Xue

Proceedings Volume 7471, 74711D (2009) https://doi.org/10.1117/12.836313

KEYWORDS: Floods, Earthquakes, Landslides, Data modeling, Earth sciences, Photography, Remote sensing, Mathematical modeling, Numerical simulations, Data storage

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On May 12th 2008, an 8.0 magnitude earthquake struck in Southwest China, triggered massive landslides and created many unstable and dangerous quake lakes. As a secondary disaster of earthquake, Quake Lake usually breaks after damming up a large amount of water and threatens cities and villages in the downstream area. This paper is devoted to modeling the dam break and analyzing the flow hydrograph coming out of the breach for quake lakes with the BREACH method. We simulate the formation of dam breach and the flood discharge with a case of the Tangjiashan Quake Lake, and analyze the hydraulic impacts of dam-break flood on the downstream areas. The results can facilitate the assessment on the flood risk of quake lake caused by earthquake, and also can be used to estimate the magnitude and extent of dambreak flood with Earth observations.

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