Pearl River Water Resources Scientific Research Institute

Guangzhou, China

Pearl River Water Resources Scientific Research Institute

Guangzhou, China
SEARCH FILTERS
Time filter
Source Type

Hu H.,Pearl River Water Resources Scientific Research Institute | Zhang Y.,GuangDong Research Institute Resources and Hydropower
2011 International Conference on Multimedia Technology, ICMT 2011 | Year: 2011

Development and utilization of urban underground space is conducive to improving the urban functions, giving full play to the city's social, environmental and economic benefits, but also inevitably encounters many new and more complex geotechnical engineering problems. In this paper, we took a foundation project above the metro subway tunnel in Guangzhou as an example, for which a numerical model was established to calculate and analyze the influence of excavation on the existing tunnel from aspects of deformation, additional stress of tunnel segments and anti-floating stability. The results show that the excavation inevitably leads to soil deformation at the bottom of the foundation pit, which causes displacement of the tunnel and change of the stress state of the tunnel segment. The results provide valuable reference to the project design and construction. It is helpful to other similar projects. © 2011 IEEE.


Zhang Y.-C.,GuangDong Research Institute Resources and Hydropower | Yang G.-H.,GuangDong Research Institute Resources and Hydropower | Hu H.-Y.,Pearl River Water Resources Scientific Research Institute
Advanced Materials Research | Year: 2012

Problems and flaws of existing safety criteria for vibration are reviewed. A simple consideration of particle vibration velocity cannot fully reflect the inherent law of effects of explosion earthquake on structures. Sometimes the occurrence of explosions exceeding the standard velocity for safety will not necessarily cause damage to structures and those below the standard velocity for safety may destroy structures. For this reason, the free vibration frequency of structures and the safety margin of the structure should be considered. Based on safe, practical and convenient conditions, that in respect of safety criteria for dike and slope exposed to vibration, two indicators, i.e., stability factor of dike and slope and vibration velocity of particle, can be used to determine the effect of vibration on them is proposed. That is to say, pseudo-static method is adopted to make vibration inertia force equivalent to a static force on slope bars and then strength reduction method or limit equilibrium method is used to calculate the safety factor, which can directly evaluate the stability of slope. In combination with the particle vibration velocity given in specifications, the safety of dike and slope can be determined. Lastly, specific engineering cases are used to validate the rationality of this criterion. This method can serve as a reference for similar projects.


Zhang Y.-C.,China Institute of Water Resources and Hydropower Research | Yang G.-H.,China Institute of Water Resources and Hydropower Research | Yang G.-H.,Wuhan University | Hu H.-Y.,Pearl River Water Resources Scientific Research Institute | And 2 more authors.
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2012

Based on the construction of excavation cofferdams and pumping station foundation underneath pipelines in soft soils, the effect of the construction of excavation cofferdams and foundation on the pipelines and their protective measures are studied. The effect of the construction of the cofferdams and foundation on the pipelines is the key consideration because they are under the cofferdams and in the floor of the pumping station foundation. Therefore, based on the safety control standards, numerical models are establised to analyze the effect of the construction on them. The results show that the cofferdam construction has considerable vertical loading impact on the pipelines, inevitably creating the deformation of the upper soil and causing the displacement of pipelines in soils. At the same time, the stress state changes as well. However, using the appropriate reinforcement measures, the safety of the pipelines can be guaranteed during the construction. The present results can be used to optimize the design and construction and provide reference for other similar projects.


Sun D.,Nanjing University of Information Science and Technology | Li Y.,Nanjing Normal University | Le C.,University of South Florida | Shi K.,CAS Nanjing Institute of Geography and Limnology | And 3 more authors.
Remote Sensing of Environment | Year: 2013

Remote sensing detection of suspended particulate composition is of importance for understanding variability of water optical properties, especially in complex-material loading turbid inland waters. To achieve this goal, this study carried out multiple in situ bio-optical investigations during the period of 2008~2010, covering Lake Taihu, Chaohu, Dianchi, and Three Gorges reservoir in China. Using the collected in situ observed datasets, a semi-analytical approach was developed based on theoretical derivation of the water radiative transfer theory. This algorithm showed relatively high calibration accuracy, and was further evaluated by means of an independent validation dataset, producing low predictive errors (mean absolute percentage error, MAPE=29.5%, and root mean square error, RMSE=0.23, 10-3). Then, the developed algorithm was applied into a new hyperspectral satellite data, namely the HJ1A/HSI image, mapping spatio-temporal distribution of suspended particulate composition for Lake Taihu waters. The findings in the present study indicate that the proposed approach has a great potential in detecting particulate composition of water bodies. This study provides us improved understanding of particulate composition characteristics and corresponding spatio-temporal distribution for complex turbid inland waters. © 2013 Elsevier Inc.


Wu L.-H.,Hohai University | Zhuang S.-Y.,Pearl River Water Resources Scientific Research Institute
AIP Conference Proceedings | Year: 2010

A tide simulation system based on two-way water pump technique is developed by authors. Using this system, the groundwater table fluctuation characteristics, relative over height of groundwater table, and influencing factors of over height are investigated. The experiment results indicate that the groundwater table fluctuation is of periodicity, and of asymmetry. The amplitude of groundwater table fluctuations decreases with the increase of the onshore distances. There are phase lags of groundwater table fluctuations for different monitoring points. The tide can cause remarkable over height of coastal groundwater table. The dominating factors bring about over height include tide amplitude, tide frequency and aquifer thickness. Under above experiment conditions, the maximum value of over height exceeded 50% of the maximal tide amplitude, and reached about 10% of aquifer thickness. So, over height is not a negligent factor of forecasting the groundwater resource gross in coastal area. © 2010 American Institute of Physics.


WU L.-h.,Hohai University | ZHUANG S.-y.,Pearl River Water Resources Scientific Research Institute
Journal of Hydrodynamics | Year: 2010

In this article, a tide simulation system based on a two-way water pump technique is developed. Using this system and numerical simulations, the groundwater table fluctuation characteristics, relative over height of groundwater table, and influencing factors of over height are investigated. The experimental and numerical results indicate that the groundwater table fluctuation is of periodic, and of asymmetric. The amplitude of groundwater table fluctuations decreases with the increase of the onshore distances. There are phase lags of groundwater table fluctuations for different monitoring points. The tide can bring about remarkable over height of coastal groundwater table. The dominating factors bring about over height include the tide amplitude, aquifer thickness and tide frequency. Under experimental conditions, the relative tide amplitude over height may exceeded 50% of the maximal tide amplitude, and reach about 10% of aquifer thickness. © 2010 Publishing House for Journal of Hydrodynamics.


Ren H.,CAS South China Botanical Garden | Wu X.,Pearl River Water Resources Scientific Research Institute | Ning T.,Chinese Institute of Urban Environment | Huang G.,Chinese Institute of Urban Environment | And 3 more authors.
Landscape and Ecological Engineering | Year: 2011

Mangrove forests and associated gei wai (excavated ponds used for shrimp and fish farming) provide important ecosystem services in Shenzhen Bay. Much of the mangrove and gei wai wetlands, however, have been lost because of intensified human activities in the past 30 years. Using five-phase remote-sensing images, we describe the recent history of the spatial-temporal dynamics for the wetlands in the bay. From 1986 to 2007, mangrove area increased from 1.8 to 4.8 km2, while the area of gei wai decreased from 36.6 to 17.2 km2. Reclamation of gei wai mainly occurred in western and northern Shenzhen Bay, and changed the tidal water environment. The bay has five typical mangrove communities: Avicennia marina + Kandelia candel + Aegiceras corniculatum, Kandelia candel + Aegiceras corniculatum + Acanthus ilicifolius, Bruguiera gymnorrhiza + Excoecaria agallocha, Aegiceras corniculatum, and Sonneratia apetala + Sonneratia caseolaris. The distribution of these communities and their dominant species in the bay exhibit a spatial pattern and temporal (successional) sequence. We describe a mangrove restoration program based on the mangrove successional sequence and the interaction of mangrove and gei wai in the bay. We have planned six mangrove protection and restoration projects in closed areas, semiclosed areas, and open areas to reconstruct the ecological integrity of the entire Shenzhen Bay. © 2010 International Consortium of Landscape and Ecological Engineering and Springer.


Wang X.,Pearl River Water Resources Scientific Research Institute
34th Asian Conference on Remote Sensing 2013, ACRS 2013 | Year: 2013

In the paper, based on the technology of remote sensing and geographic information system, and according to the Landsat TM images obtained the land use database and land surface temperature of Yancheng city in the year of 2000 and 2009. Five land use types were identified, namely: Farmland, building site, forest and grassland, water, and beach wetland. And then analysis of the urban expansion model based on the Defense Meteorological satellite data. The results show that: (1) In the five kinds of land use types, the largest rate of land use change is beach wetland, which is -8.23, followed by water as -5.17, forest and grassland is 3.27, building site is 2.24, farmland is 0.69. (2) During the 2000-2009, the towns of Yancheng city continuous outward expansion. In the old town, the expansion model is similar to the concentric circles spread to the periphery, but in the new district, which mainly concentrated in the northeast and southeast, the expansion model is re-planning, development and construction. (3) The land use structure change, especially the changes of beach wetland have a largest influence on the land surface temperature of Yancheng city. Among them, the average land surface temperature has increased over 8 degrees. However, the farmland change due to the overall land surface temperature decreased. And the increase of building site, making the urban heat island effect has been enhanced, while the town where the land surface temperature increases in value added in 0 to 5 degrees. At the same time, the water changes, this due to the land surface temperature increases and the added value in the range of 5 to 8 degrees. Copyright© (2013) by the Asian Association on Remote Sensing.


Wang X.,Pearl River Water Resources Scientific Research Institute
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2014

In the paper, based on the technology of remote sensing and geographic information system, and according to the Landsat TM images obtained the land use database and land surface temperature of Yancheng city in the year of 2000 and 2009. Five land use types were identified, namely: farmland, building site, forest and grassland, water, and beach wetland. And then analysis of the urban expansion model based on the Defense Meteorological satellite data. The results show that: (1) In the five kinds of land use types, the largest rate of land use change is beach wetland, which is -8.23, followed by water as -5.17, forest and grassland is 3.27, building site is 2.24, farmland is 0.69. (2) During the 2000-2009, the towns of Yancheng city continuous outward expansion. In the old town, the expansion model is similar to the concentric circles spread to the periphery, but in the new district, which mainly concentrated in the northeast and southeast, the expansion model is re-planning, development and construction. (3) The land use structure change, especially the changes of beach wetland have a largest influence on the land surface temperature of Yancheng city. Among them, the average land surface temperature has increased over 8 degrees. However, the farmland change due to the overall land surface temperature decreased. And the increase of building site, making the urban heat island effect has been enhanced, while the town where the land surface temperature increases in value added in 0 to 5 degrees. At the same time, the water changes, this due to the land surface temperature increases and the added value in the range of 5 to 8 degrees. © 2014 Copyright SPIE.


Guan D.S.,Pearl River Water Resources Scientific Research Institute | Li Y.Q.,Pearl River Water Resources Scientific Research Institute | Huang Z.X.,Pearl River Water Resources Scientific Research Institute | Yang S.D.,Pearl River Water Resources Scientific Research Institute
Applied Mechanics and Materials | Year: 2014

This paper introduces IBIS-L (Image by Interferometric Survey-L) and its application on early warning system of embankment slope deformation. Visual Basic programming language and Microsoft SQL Server are used to develop the software of early warning system of embankment slope's deformation, which can build the model to predict and early warn of the deformation of embankment slope with considering the parameters obtained both by IBIS-L and routine monitoring. © (2014) Trans Tech Publications, Switzerland.

Loading Pearl River Water Resources Scientific Research Institute collaborators
Loading Pearl River Water Resources Scientific Research Institute collaborators