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Assessing the risk of check dam failure due to heavy rainfall using machine learning on the Loess Plateau,China

International Soil and Water Conservation Research 2024年第3期12卷 506-520页

作者： Yulan Chen Jianjun Li Juying Jiao Leichao Bai Nan Wang Tongde Chen Ziqi Zhang Qian Xu jianqiao Han The Research Center of Soil and Water Conservation and Ecological Environment Chinese Academy of Sciences and Ministry of EducationYanglingShaanxi712100China Institute of Soil and Water Conservation Chinese Academy of Sciences and Ministry of Water ResourcesYanglingShanxi712100China University of Chinese Academy of Sciences Beijing100049China Institute of Soil and Water Conservation Northwest A&F UniversityYanglingShaanxi712100China School of Geographical Sciences China West Normal UniversityNanchong637009China School of Politics and Public Administration Qinghai Minzu UniversityXiningQinghai810007China

Check dams are widely used throughout the world to tackle soil and water ***,the ffequency of extreme rainfall events has increased owing to global climate change and the main structure of check dam is gradually *** lead to an increase in the failure risk ofcheck *** is necessary to carry out the study on failure risk diagnosis and assessment of check *** the study,machine learning algorithms(ML).including random forests(RF).support vector machine(SVM),and logistic regression(LR).were used to integrate the environmental and engineering factors and then assess the risk of check dam failure due to the“7.26”rainstorm on Iuly 26.2017,in the Chabagou watershed.10cated in the hilly—gully region of the Loess *** veri~the generalizability of the model in this study。these models were used for the Wangmaogou catchment north of the Loess *** accuracy assessment by the receiver operating Characteristic fROCl curve indicated that the RF model with an area under the ROC curve fAUCl greater than 0.89 was the most precise model and had a higher general—ization *** *** model dataset was relatively smalI and easy to *** make the risk modeling of check dam failure in the study has the potential for application in other *** the RF *** factor selected was confirmed to be important,and the importance values for engineering factors were generally higher than those for the environmental *** risk map of check dam failure in the RF modelindicated that 56.34%of check dams in the study area had very high and high risks of dam failure under high—intensity rainfall in *** on the importance of factors and the risk map of check dam *** prevention and control measures for reducing the risk of check dam failure and promoting the construction of check dam are *** proposals provide a scientific basis for the reinforcement of check dams and the future layout of check dams in the C

关键词： Check dam failure risk Machine learning Reinforcement measures Loess Plateau

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Reliability improvement of gas discharge tube by suppressing the formation of short-circuit pathways

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Plasma Science and Technology 2022年第3期24卷 138-151页

作者： Lingyun CHENG Nianwen XIANG Kejie LI Weijiang CHEN Kai BIAN Jin YANG Zongqi XU Congying HAN Hongyang GU Chun YANG Heifei University of Technology Hefei 230009People's Republic of China Institute of Energy Hefei Comprehensive National Science CenterHefei 230031People's Republic of China State Grid Corporation of China Beijing 100031People's Republic of China Beijing National Railway Research&Design Institute of Signal&Communication Group Co. Ltd.Beijing 100070People's Republic of China

After cumulative discharge of gas discharge tube(GDT),it is easy to form a short circuit pathway between the two electrodes,which increases the failure risk and causes severe influences on the protected *** reduce the failure risk of GDT and improve cumulative discharge times before failure,this work aims to suppress the formation of two short-circuit pathways by optimizing the tube wall structure,the electrode materials and the electrode structure.A total of five improved GDT samples are designed by focusing on the insulation resistance change that occurs after the improvement;then,by combining these designs with the microscopic morphology changes inside the cavity and the differences in deposition composition,the reasons for the differences in the GDT failure risk are also *** experimental results show that compared with GDT of traditional structure and material,the method of adding grooves at both ends of the tube wall can effectively block the deposition pathway of the tube wall,and the cumulative discharge time before device failure is increased by 149%.On this basis,when the iron-nickel electrode is replaced with a tungsten-copper electrode,the difference in the electrode’s surface splash characteristics further extends the discharge time before failure by 183%.In addition,when compared with the traditional electrode structure,the method of adding an annular structure at the electrode edge to block the splashing pathway for the particles on the electrode surface shows no positive effect,and the cumulative discharge time before the failure of the two structures is reduced by 22.8%and 49.7%,*** these improved structures,the samples with grooves at both ends of the tube wall and tungsten-copper as their electrode material have the lowest failure risk.

关键词： gas discharge tube short-circuit failure tube wall groove tungsten-copper electrode failure risk

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