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Analysis and lessons from typical failures of hydropower stations in China in recent years
WANG Huiyi and LIU Deming
Abstract （996）      PDF （320KB）（367）      
Water conservancy and hydropower projects have the characteristics of long construction period, complex structure, and being greatly affected by natural factors. An accidental factor in operation may sometimes lead to systematic safety accidents of the whole hydropower station. The author summarizes some typical cases of domestic hydropower station accidents in recent years, and analyzes some risk factors needing attention in the construction and operation management of hydropower stations, to provide reference for design, construction and operation management.
2022, 0 (6): 1-.
Calculation of characteristic particle size and envelope of filter material in earth-rockfill dams
HE Xinhua, CAI Yongping and CAI Xiaohong
Abstract （410）      PDF （240KB）（134）      
According to SL 274—2020 Design Code for Rolled Earth-rock Fill Dams, Sherard inverted layer design criteria are recommended. Based on the characteristic particle size of protected soil, the characteristic particle size of filter material and the envelope are calculated, and constraint condition for the closure and recovery of the crack in impervious body is presented, which make the inverted layer more reliable and reasonable.
2022, 0 (6): 23-.
Application research of intelligent dispatching based on cascade hydropower stations in whole ba sin
QIAN Wei and SUN Jingying
Abstract （333）      PDF （1273KB）（774）      
In order to realize the intelligent dispatching operation goal of cascade hydropower stations in
Nam Ou river basin in Laos, based on the management concept of digital transformation, this study ana lyzes the difficulties of overall dispatching for cascade hydropower stations, and explores the implemen tation path and effective measures to improve the accuracy of hydrometeorological prediction and the op eration and dispatching capability of hydropower stations. Through the intelligent dispatching of hydro power stations, the economic benefit, social benefit and ecological benefit are improved, and the goal of  carbon peaking and carbon neutrality is promoted. It can provide guidance and reference for hydropower  development along the Belt and Road and the cascade control centers in major river basins at home and
abroad.
2024, 0 (3): 1-4，14.
Application scenarios and design points of dam safety video surveillance system
LI Qian and CHEN Kai
Abstract （268）      PDF （350KB）（163）      

This paper describes the relationship between the dam safety video surveillance system and other systems, and summarizes the objects and contents to be monitored. Also, selection of right frontend device, communication, control, storage and display equipment based on the characteristics of hydropower dam and monitoring objects is introduced. In accordance with the principles of practicability, reliability, economy, advancement, maintainability expandability and upgradability, the dam safety video surveillance system is designed to meet the needs of dam safety management.

2022, 0 (6): 37-.
Development and application of new elastic epoxy coating
LIU Deming, WU Qimin, CHEN Qiao, YU Xun and SHAO Yimin
Abstract （264）      PDF （483KB）（185）      
HK-968 elastic epoxy coating is modified by chemical toughening. It combines the elasticity of polyurethane materials with the strength and adhesion of epoxy materials. It cures at room temperature and has better durability on the concrete surface which exerts good effect on the treatment of difficult problems such as cavitation and abrasion damage of hydraulic structures. This paper introduces the development process of HK-968 elastic epoxy coating from the aspects including main agent selection,
performance tests and adjustments, durability tests and so on, and two application cases are presented, for reference.
2022, 0 (6): 67-.
 Logic of graded warning for dams under the condition of earthquake and its implementation
LYU Gaofeng, HUANG Chengjia, ZHENG Shuqian, LIU Xili and LUO Dongxu
Abstract （238）      PDF （1557KB）（132）      
Earthquakes, especially strong earthquakes, may easily cause dam accidents. The actual damage of the dam is determined by the earthquake intensity, which is related to the earthquake magnitude, hypocenter depth, geological structure and the distance between the dam and the hypocenter. To realize the graded warning for dams under the condition of earthquake, it is necessary to use the statistical model to quickly calculate the earthquake magnitude at the dam site and compare it with the design standard. By computer programming, the above-mentioned functions can be realized, which can quickly locate the dam that may be damaged by the earthquake and realize rapid early warning for the dam.
2023, 0 (6): 1-.
Warning significance from the“1·12”water inrush accident of Guanzhou hydropower station
WANG Xianguang, CHENG Ruoyu and ZHAO Dong
Abstract （235）      PDF （1003KB）（274）      
The“1·12”water inrush accident of Guanzhou hydropower station reflects the problems that the main responsibility of safety management is not implemented, the procedures of bidding and procurement are chaotic, and the quality of pipe bulkhead is poor. Enterprises in charge of the operation and management of hydropower stations should learn from this accident. In order to eliminate risk factors and ensure the operation safety of power stations, responsibilities of relevant departments should be fulfilled, technical management should be strengthened, and the sensitivity and responsibility of operation management personnel should be improved.
2022, 0 (5): 1-3.
Safety monitoring of concrete dams from the perspective of the whole life cycle
YANG Guang, ZHANG Shuai and ZHAO Zhiyong
Abstract （226）      PDF （253KB）（151）      
GB/T 51416—2020 Technical Standard for Concrete Dam Safety Monitoring specifically points out that concrete dam safety monitoring should run through the whole life cycle of concrete dam design, construction and operation. In each stage of the period, the objectives in stages should be accomplished, equal importance should be attached to the operation, maintenance and construction of the monitoring system, and equal attention should be paid to patrol inspection and instrument observation, data
analysis and acquisition as well as risk early warning and feedback analysis. To accurately understand this new concept, combined with the current status of concrete dam safety monitoring, the relevant contents are briefly introduced and explained, for reference.
2022, 0 (6): 31-.
Optimization and application of hydraulic patrol inspection
CHEN Xixin, LIU Jian and CHEN Tianshen
Abstract （216）      PDF （370KB）（228）      
With the development of information technology, the traditional paper-based hydraulic patrol inspection work is gradually transformed into a patrol inspection management system (module). At present, the patrol inspection system still has some problems. For example, the patrol inspection objects are not abstractly classified, the defects are not objectified, and the functions of patrol inspection App are simple. Aiming at the above-mentioned problems, the optimization design scheme is proposed and applied to the patrol inspection module in the dam safety information management system for Yalong river basin. Web terminal and mobile terminal (App) are mainly included in this module and functions such as viewing tasks, patrol inspection, result recording and query, defect tracking and query are available. With the help of information management means, this system can optimize the information management mode of hydraulic patrol inspection and further improve the level of dam safety information management.
2023, 0 (2): 4-.
Emergency disposal of large-volume floating objects in Gaobazhou reservoir of Hubei province
GONG Jianbing and LIU Bozhi
Abstract （214）      PDF （1364KB）（1443）      
Taking the emergency disposal of large-volume floating objects in Gaobazhou reservoir of Hubei province as an example, this paper introduces the event process and risk analysis of Gaobazhou hydropower station facing the accumulation of floating objects such as large-scale fish farming cages in the reservoir due to heavy rainfall in the Qingjiang river basin. As well, the effective practice of flotsam cleanup and emergency disposal of Qingjiang Company of China Three Gorges Corporation is summarized, for reference.
2023, 0 (1): 13-18.
Research and development of dam safety monitoring data diagnosis and analysis system and its application#br#
XU Lei, QI Zhiyong, ZHOU Jianbo and ZHAO Jianhua
Abstract （209）      PDF （338KB）（185）      
Aiming at the problems such as low work efficiency, weak professional level, and poor timeliness existing in the manual analysis, information technology is adopted and a set of dam safety monitoring data diagnosis and analysis system is designed and developed, which has obvious advantages in monitoring data preprocessing, distribution map drawing, engineering analogy, abnormous situation feedback, and et al. As well, it can realize the automatic generation of monthly reports, quarterly reports, annual reports, earthquake express reports and comprehensive monitoring data analysis reports. The application shows that the system can significantly improve the efficiency and quality of dam safety monitoring data diagnosis and analysis work, and it is worthy of promotion in dam safety management industry.
2023, 0 (2): 24-.
Design of maintenance channels of diversion tunnels at Jinping Ⅱ hydropower station
BAO Shihu, ZHANG Yang and CHEN Xiaojiang
Abstract （208）      PDF （1417KB）（430）      
The diversion tunnels of Jinping Ⅱ hydropower station extend across Jinping mountain, including the areas with high stress and high external water pressure. The tunnel section is huge. In order to ensure the long-term and safe operation of the power station, the maintenance channels are arranged for diversion tunnels. This paper introduces the design and structural calculation of the maintenance shaft of emergency gate in water inlet and the access door of construction adit at the head and end of the diversion tunnel.
2022, 0 (5): 24-27.
Improvement of patrol inspection for hydropower station
LI Xiaoxiao, FENG Yongxiang, CHU Zhaowei and LIU Tong
Abstract （208）      PDF （315KB）（186）      
Patrol inspection is an important means to ensure the safety of hydropower stations. Based on summary of the advantages and disadvantages of traditional patrol inspection schemes, combined with digital inspection methods, this paper proposes an optimized scheme and a new online inspection system scheme is formed. Upgrading of inspection functions, the optimization of inspection types and content as well as the optimization of inspection systems are realized. After the scheme optimization, the degree of data structuring has been improved, the data redundancy has been significantly reduced, and the defect management function has been added. Moreover, the online inspection system designed based on this scheme has been applied to Ertan hydropower station.
2022, 0 (6): 10-.
Research on short message technology based on Beidou satellite and its application in dam safety monitoring#br#
LIU Xiang, HAN Rongrong and LIU Yujia
Abstract （206）      PDF （301KB）（154）      
A monitoring information reporting system based on Beidou SMS communication for hydropower stations is designed. This system collects the monitoring data of hydropower station from Beidou high-precision sensors in real time under emergency conditions and sends them to the dam safety supervision platform of National Energy Administration through Beidou short message communication, thus reliable conditions for getting insight into the operation of hydropower dam under extreme weather are created.
2022, 0 (6): 34-.
Typical problems and thoughts on design of safety monitoring for small reservoirs
JIANG Chao, XU Hong, SUN Yin and CAO Xin
Abstract （202）      PDF （322KB）（419）      
Based on design review, the typical problems in design of safety monitoring for small reservoirs were systematically summarized, including inadequate capability of design organization, omission of important design content, incomplete design-related basic information, improper utilization of existing safety monitoring equipment, design divorced from engineering practice, confusing set of important and unimportant monitoring items, and et al. It is proposed that the quality management of safety monitoring needs to be enhanced in aspects such as more attention paid to the design, improvement of guidance and training, strengthening of design inspection, special focus on safety monitoring design of reinforced and newly-built small reservoirs.
2023, 0 (2): 32-.
Key technologies for excavation and backfill consolidation of weak grooves in fault-altered zones
LIU Liqiang
Abstract （201）      PDF （433KB）（138）      
To solve the technical difficulties in excavation protection of dam foundation under complex geological conditions, technologies of excavating fault-altered rock mass - excavating weak grooves by a small amount of explosive charge each time and by multiple zones, backfilling with concrete, and consolidation grouting are innovatively adopted. The effects of excavation and consolidation treatment measures are evaluated by engineering application and on-site acoustic detection analysis to prevent relaxation of excavated dam foundation rock mass and to ensure rock mass stability. It can help ensure that the unfavorable dam foundation conditions can meet up with the requirements of a high arch dam foundation, and avoid the overall failure of rock mass due to fault conditions, which has important theoretical significance and broad application prospects.
2022, 0 (6): 73-.
Analysis of deformation characteristics of Wangjiashan landslide in Baihetan reservoir area before impoundment based on SBAS- InSAR
CUI Zhenhua, YANG Jianyuan, DUN Jiawei, YAO Yu'ang and CHEN Tingxuan
Abstract （201）      PDF （4186KB）（245）      
The time series deformation characteristics of Wangjiashan landslide in Baihetan reservoir area before impoundment are studied by using Sentinel- 1ASAR dataset and SBAS- InSAR technology. The results show that Wangjiashan landslide has been in an initial deformation state in the past four years, with deformation occurring first in the middle part and then expanding to the front edge and back edge.Through joint analysis with historical rainfall data, it is found that Wangjiashan landslide is highly sensitive to rainfall, and the deformation is not only significantly correlated with cumulative rainfall, but also influenced by concentrated heavy rainfall. Therefore, a monitoring and early warning system should be established during impoundment period to provide early warning of geological disasters and reduce casualties and property losses. The time series deformation results of Wangjiashan landslide demonstrate the potential application of InSAR technology in landslide detection, which provides new ideas and references for landslide spatiotemporal evolution, causal analysis, as well as disaster prevention and reduction.
2023, 0 (5): 8-14.
Dam failures in the U.S
Dept. of Civil & Environmental Engineering, Stanford University
Abstract （197）      PDF （541KB）（143）      
This paper presents a compilation of data summaries on dam failures and the life safety consequences from the flooding caused by failures that have occurred in the United States. It has been prepared by the National Performance of Dams Program (NPDP) at the Department of Civil and Environmental Engineering at Stanford University.
2023, 0 (2): 67-.
The important system guarantee for improving the safety management level of hydropower station dam operation
DU Dejin
Abstract （196）      PDF （947KB）（381）      
2023, 0 (1): 1-3.
Logic of graded warning for dams under the condition of typhoon and its implementation
LYU Gaofeng, ZHENG Shuqian, LIU Xili, HUANG Chengjia and LUO Dongxu
Abstract （193）      PDF （391KB）（166）      
Typhoon exerts great impact on the operation safety of dams in China, especially on the dams in typhoon prone areas along the southeast coast. The impact of typhoon wind on the dam is mainly determined by the wind scale. At present, China Meteorological Administration has realized the prediction of typhoon track and different wind grade radius in the four quadrants of typhoon. The geographic coordinate information database of the concerned dams is established, the typhoon prediction information can be obtained in real time and the later influence range of different typhoon wind scale can be calculated. Based on the dam location and the local wind scale, graded warning is realized. The above-mentioned functions are realized through computer programming. It would quickly identify the dams which may be damaged by typhoon and realize rapid early warning for dams encountering typhoon.
2023, 0 (2): 1-.
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