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Study on early warning index of spatial deformation for high concrete dam

Science China(Technological Sciences) 2011年第6期54卷 1607-1614页

作者： LEI Peng CHANG XiaoLin XIAO Feng ZHANG GuiJin SU HuaiZhi School of Hydraulic Engineering Changsha University of Science and Technology Changsha 410114 China College of Water Resources and Hydroelectric Engineering Wuhan University. Wuhan 430072 China Mid-south Design and Research Institute China Hydropower Engineering Consulting Group Co Changsha 410014 China College of Water Conservancy and Hydropower Engineering Hohai University Nanjing 210098 China

Owing to the deficiency in early warning for high concrete dam,a formula was established to characterize the deformation behavior of high concrete dam as a *** early warning index of spatial deformation was calculated by low probability principle on the basis of the deformation entropy formula *** steps were as ***,the probability method was utilized to define the degree of order and degree of chaos for each survey ***,the weight distribution among the survey points was calculated by projection pursuit ***,the formula of holistic deformation entropy,which can represent the degree of order of high concrete dam,was established on the basis of synergetics and information ***,the early warning index of deformation entropy was computed by low probability method based on series of calculated deformation entropy *** example showed that the dynamic property of deformation entropy is in accordance with both environmental variables and deflection ***,deformation entropy can be used to improve warning ability and safety management for high concrete dam.

关键词： deformation entropy early warning index synergetics dam monitoring concrete dam

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A new early warning method for dam displacement behavior based on non-normal distribution function

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Water Science and Engineering 2022年第2期15卷 170-178页

作者： Zhen-xiang Jiang Hui Chen School of Hydraulic and Ecological Engineering Nanchang Institute of TechnologyNanchang 330099China

Traditional methods for early warning of dam displacements usually assume that residual displacements follow a normal *** assumption deviates from the reality,thereby affecting the reliability of early warning results and leading to misjudgments of dam displacement *** solve this problem,this study proposed an early warning method using a non-normal distribution function.A new early warning index was developed using cumulative distribution function(CDF)*** method of kernel density estimation was used to calculate the CDF values of residual displacements at a single *** copula function was used to compute the CDF values of residual displacements at multiple *** results showed that,with residual displacements in a non-normal distribution,the early warning method proposed in this study accurately reflected the dam displacement behavior and effectively reduced the frequency of false *** method is expected to aid in the safe operation of dams.

关键词： Non-normal distribution Dam displacement early warning index Kernel density estimation Copula function

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Prediction and early warning Indicators of Short-term Severe Convection Weather in Ulanqab City

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Meteorological and Environmental Research 2023年第5期14卷 33-35页

作者： Tao ZHANG Ulanqab Meteorological Bureau Ulanqab 012000China

Based on the disaster reports,NCEP2.5X2.5 reanalysis data and radiosonde data of 11 national stations in Ulanqab region from June to August during 2012-2017,the weather situation classification and warning indicators of thunderstorm and gale,hail and short-term heavy rainfall were *** results show that the cold vortex weather situation was easy to produce hail,and the falling area of severe convection could be found in the downstream of the cold vortex,the intersection area of jet stream at 200 and 500 hPa,and the wet area side of the 700 hPa main *** cold trough type weather situation was easy to produce thunderstorm and gale,and the falling area of severe convection appeared on the right side of the upper jet stream axis,the left side of the lower jet stream axis,the wet side of the 700 hPa main line,and the east of the shear line at 700 *** weather situation of the low trough and subtropical high type was dominated by short-term rainstorm,and the falling area of severe convection was on the right side of upper jet stream at 200 hPa,the left side of the low southeast jet stream,and the wet side of the 700 hPa main *** warning index thresholds of the total index,the temperature change at 850-500 hPa with height,the height of 0 and-20℃layer,lifting condensation height,temperature dew point difference and mixing ratio were highly reliable.

关键词： Severe convection early warning index Weather situation

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