Abstract:The engineering procurement construction(EPC)joint venture model has become the mainstream construction mode for large and medium-sized water conservancy projects in China.However,existing research still has gaps in refinement of safety management responsibilities and rights in joint ventures and design-construction safety synergy.Under the EPC joint venture model,safety management faces five typical problems:diluted safety responsibility,absence of source prevention and control,fragmentation of management and control systems,insufficient emergency support,and weak subcontracting control.Taking the Jiyun River Estuary Pumping Station Project in Tianjin as a case study for empirical research,this paper proposes a comprehensive safety management system addressing these issues,encompassing responsibility consolidation,deep integration of design and construction,rigid assessment mechanisms,unified emergency management,and full-chain subcontractor control.The project achieved zero safety incidents throughout the entire construction process involving deep foundation pits and electromechanical equipment installation,with a 100%closed-loop rectification rate for potential hazards and a 100%compliance rate for major risk engineering controls.The project was also selected as a pilot project for the"Six Mechanisms"of safety risk control in Tianjin.The research findings can provide replicable practical references for refined safety management in similar water conservancy EPC joint venture projects.

Abstract:Under the background of global climate change and urbanization,combined sewer overflow pollution and waterlogging during flood seasons have become critical bottlenecks constraining urban resilience enhancement.The central urban area of Tianjin,as a northern coastal urban area located at the confluence of nine rivers,retains 21.88 km² of combined sewer system areas,with existing facilities having insufficient storage capacity and pollution not being fundamentally resolved.Taking the Tianjin Nanjing Road Storage Tank Project as a case study,this paper examined the issue from three perspectives of hydrology,environment,and urban development,analyzed the synergy among four dimensions of infrastructure,policy,space,and system,clarified that key measures can amplify effects and form virtuous cycles,highlighted the core role of large-scale drainage storage tanks in enhancing urban flood resilience,provided replicable resilience enhancement paths for similar cities with high combined sewer system proportions,land scarcity,and complex hydrological conditions,and enriched the theory and practice paradigms of resilient city construction.

Abstract:To provide scientific basis for the design and ecological protection of the Meijiang Irrigation District Project,this paper aims to systematically assess the impact of the project on the wetland ecosystem,propose effective ecological protection measures,and ensure ecological feasibility of project construction.The research content encompasses three aspects:① comprehensive field surveys combined with data analysis are conducted to comprehensively understand the current status of wetland resources,biodiversity,and ecosystem integrity within the wetland park area involved in the project;② overlay mapping method and ecological mechanism method are employed to predict the impact of the project on the ecological structure and function of the wetland park;③ comprehensive mitigation measures including construction process optimization and flora and fauna protection are proposed.The results indicate that,with the implementation of the above measures,the impact of the project on the ecosystem structure,function,and biodiversity of the wetland park is relatively minor and within a controllable range,demonstrating the ecological feasibility of the project construction.This study can provide methodological references for environmental impact assessment of similar projects and promote coordinated advancement of irrigation district development and wetland ecological function protection.

Abstract:The facade stone protection of the Muchang Ship Lock Project on the North Canal was constructed using the dry-hang method.However,the conventional installation process suffered from issues such as relatively low construction efficiency and significant schedule risks.Through technical diagnosis,the alignment calibration between the grooves and the hangers was identified as the key bottleneck restricting construction efficiency.To address this problem,two core technical improvement measures were proposed:(1)replacing the sling material with a soft steel wire rope(6×7-FC1770ZS)of 8 mm diameter to resolve the difficulty of sling removal after installation;and(2)optimizing the measurement reference by shifting the measuring points from the front face of the dressed stone to the back face without decorative patterns,thereby improving measurement accuracy.Engineering application results demonstrate that after optimization,the installation time per single block of dressed stone was reduced from 36 minutes to 14 minutes,a reduction of 61.1%,and the daily installation volume increased from 17 blocks to 41 blocks,meeting the milestone schedule requirements.The research findings can serve as a reference for the installation of dressed stones in similar ship lock and water conservancy projects.

Abstract:Taking the Hebei Fengning Pumped Storage Power Station as an example,this paper discussed the applicability and implementation path of the phased acceptance mode for soil and water conservation in pumped storage power station projects with long construction periods and batch commissioning.Aiming at the contradiction between the"three simultaneous"requirements in the Law of the People's Republic of China on Soil and Water Conservation and the batch commissioning of pumped storage power stations,as well as the inapplicability of phased acceptance in the Acceptance Specification for Soil and Water Conservation Engineering of Hydropower Project,this paper employed a combination of case analysis and policy review,focusing on the connection between actual project progress and the"three simultaneous"system for soil and water conservation.The results indicate that through reasonable division of phased acceptance scope and refinement of six-indicator calculation,the phased acceptance mode can effectively coordinate the temporal contradiction between project phased commissioning and soil and water conservation acceptance,achieving a benign control mechanism of"construction,restoration,and acceptance simultaneously".The phased acceptance of the Hebei Fengning Pumped Storage Power Station provides referable management ideas for soil and water conservation acceptance of similar projects,and simultaneously provides practical basis for promoting the improvement of relevant codes in terms of phased acceptance scope,standards,and procedures.

Abstract:To address the incompatibility between the original characteristic water levels and the current flood control system in the Dongdian,Wen'anwa,and Jiakouwa flood storage and detention areas within the Daqing River basin,this paper re-evaluates the current terrain,hydrological boundaries,and tailrace discharge capacities.A one-and two-dimensional coupled flood routing model for the middle and lower reaches of the Daqing River system is established.Under the control condition of a 100-year return period flood,adjustments to the characteristic water levels of the Xisanwa flood storage and detention areas are investigated.The results indicate that the controlled operational water level at Diliupu of Dongdian should be adjusted from 6.44 m to 5.9 m,and the characteristic water levels in Wen'anwa and Jiakouwa should be uniformly adjusted from 5.94 m to 5.5 m.Following these adjustments,the designed detention storage capacity of the Xisanwa flood storage and detention areas is 6.26 billion m³,which still exceeds the original planned storage capacity of 6.066 billion m³ after excluding safety zones and protected areas.The adjustment of characteristic water levels ensures that the functions of the flood storage and detention areas remain unchanged and their storage capacities are not reduced.The findings of this paper have been applied in the flood control planning of the Haihe River basin.

Abstract:Aiming at large-scale water diversion projects with shipping functions,this paper conducted research on probability prediction of sudden water quality safety risk events.Such projects serve as core facilities for inter-basin water resources allocation,and water quality safety concerns drinking water safety in water-receiving areas,social stability,and ecological environment along the route.Sudden water quality events,characterized by sudden occurrence,rapid diffusion,and wide harm scope,pose severe challenges to project operation and management,aiming to provide quantitative basis for precise risk prevention and control and emergency decision-making.This paper systematically identified four main risk sources including shipping vessels,port terminals,dangerous goods transport vehicles,and cross-river pipelines,constructed a comprehensive prediction analysis based on Fault Tree Analysis(FTA),integrated historical statistical data with expert judgment,identified key causal factors,and quantified the occurrence probability of various events.This method can effectively overcome difficulties arising from insufficient data and system complexity,provide quantitative basis for precise prevention and control of sudden risks and emergency decision-making,and possesses important theoretical and practical value for ensuring water conveyance quality safety of the project.

Abstract:Reconstruction projects of irrigation-drainage dual-purpose pumping stations usually involve dike-crossing construction,which will adversely affect dike safety and river flood discharge.To systematically identify key technical points for flood control assessment of such projects,this paper takes the Chaodong Pumping Station Renovation and Reconstruction Project on the left dike of Chaobai New River as an example.Under the 50-year flood control standard,the design water level is calculated using the steady non-uniform flow method,local scour depth under drainage and flood discharge conditions are computed using the Zhang Ruijin formula,and dike seepage and slope stability analyses are carried out.Meanwhile,the compliance of the project with relevant planning and risks including dike breaking during construction period,foundation pit excavation,and flood emergency rescue are assessed.The results indicate that no scour occurs in the approach channel under drainage conditions,while the scour depth on the floodplain under flood discharge conditions is 1.08 m,requiring rigid protection measures.Dike stability meets code requirements of relevant specifications.With the implementation of special construction schemes,deformation monitoring,and dewatering control measures,the impact of the project on dike and flood emergency rescue is controllable.This analysis case can provide technical references for flood control assessment of similar irrigation-drainage pumping station projects involving river construction.

Abstract:With the intelligent transformation of water resources management,the scientific determination and precise monitoring of ecological flow have become crucial to ensuring river and lake ecological security.Taking Huangcaoba Reservoir in Yunnan Province as the research object,this paper systematically investigates ecological flow determination and monitoring informatization application,with comprehensive consideration of aquatic ecosystem stability,water environment quality,and downstream domestic and production water demands.Through multiple-scheme comparison and envelope calculation using the Tennant method,R2-Cross method,ecological hydraulic method,and 7Q10 method,the results indicate that,to meet hydraulic habitat standards in different periods,the recommended ecological flow is 1.58 m³/s for the wet season(June-November,accounting for 30%of the multi-year average flow at the dam site)and 0.79 m³/s for the dry season(December-May of the following year,accounting for 15%of the multi-year average flow at the dam site).Aiming at the difficulty of precise reservoir dispatching according to natural inflow,a monitoring system covering information perception,communication network,and application management platform is established.This system integrates technologies including radar velocimeter online monitoring,Beidou satellite communication,and video surveillance,realizing real-time monitoring,compliance analysis,and abnormal alarm functions for discharged flow.The research findings not only establish scientific discharge standards,but also achieve closed-loop control of discharged flow through informatization means,providing strong support for scientific management of basin ecological flow and optimal reservoir dispatching.

Abstract:The development of the general contracting model is diversified,and there are problems such as inconsistent laws and regulations that regulate subcontracting behavior and unclear application conditions,etc.The phenomenon of compliance in form but violation of laws and regulations in essence is increasing,making subcontracting management under the general contracting model increasingly complex.In order to improve the risk identification ability of management units in subcontracting contracts,this article summarizes four key risk points of subcontracting contracts through examples based on the sorting and extraction of various regulations and judicial interpretations of subcontracting.Six measures are proposed to prevent risks through pre subcontracting management,contract disclosure,compliance review,subcontracting plan management,subcontracting contract filing management,and the establishment of supervision and inspection mechanisms,providing reference and inspiration for subcontracting management under the general contracting model.

Abstract:In the construction practice of long-distance water diversion projects in the southwestern mountainous areas,combined with construction technology,the structural design of the main arch ring of the large span pipe bridge structure composed of penstocks and arched bridges,as well as the layout of the arch buildings,were studied.The problem of deformation coordination between the lower structure and the arch steel penstocks was well solved.For the first time,the cantilever cast-in-place construction technology was applied to a super large span arched pipe bridge with a span of 180 m.After the pipe bridge was built,it showed excellent mechanical deformation performance in the water filling test process,which can provide reference for the design of similar arched pipe bridge structures.

Abstract:Water conservancy projects have significant social and economic benefits and require more investment.Since 2014,China has promoted the public-private partnership(PPP)model,which has played an important role in broadening the investment and financing channels for water conservancy construction and improving the management level and efficiency of water conservancy construction,but there are also some problems that need to be optimized in practice.Based on the data of the project management database of the national PPP comprehensive information platform and the practical cases of water conservancy PPP,this paper systematically summarizes the development process,current situation and main characteristics of the PPP model of water conservancy projects in the past 10 years,analyzes the operational risks,incentive risks,debt risks and policy risks existing in the implementation of water conservancy PPP projects,and puts forward corresponding reform directions and countermeasures.The research has important policy value for building a more healthy,sustainable,mutually beneficial and win-win public-private cooperation model and promoting the high-quality and standardized development of water conservancy PPP.

Abstract:In response to the frequent occurrence of water and drought disasters in cross-border river basins,multiple management entities,and difficulties in scheduling and coordination,a joint prevention and control mechanism and collaborative operation method for water and drought disasters in cross-border river basins has been studied.By analyzing the spatiotemporal evolution characteristics of water and drought disasters and the mutual influence mechanism among multiple regions,a four in one joint prevention and control mechanism system of"organizational coordination-responsibility division-operation implementation-support and assurance"has been constructed.On this basis,a multi-objective collaborative scheduling model is constructed,integrating risk assessment and intelligent decision-making technology to achieve scientific cross regional scheduling and efficient emergency response,in order to provide technical reference for the modernization of river basin governance system and comprehensive disaster prevention and reduction.

Abstract:This paper makes a comprehensive evaluation and analysis of the water conveyance scheme of the water system interconnection project from the main stream of the Tarim River Basin to the Kongque River,aiming to provide scientific decision support for water resources management and ecological protection in arid areas.By constructing a multi-index evaluation system including engineering technology and ecological indicators,this study uses a combination of entropy weight method and coefficient of variation method to determine the index weight to objectively evaluate the advantages and disadvantages of each water conveyance scheme.The results show that the length of water delivery,ecological water demand and ecological area are the key factors affecting the optimization of the scheme.Among them,Scheme 1(Shazi River Channel)was identified as the optimal water conveyance scheme with its highest comprehensive evaluation score of 0.4472.The conclusions of this study provide technical support for water system interconnection projects in similar arid areas,and provide a new perspective for future water resources management and ecological protection.

Abstract:In order to study the water pollution situation of the water conveyance tunnels in environmentally sensitive areas and ensure the safe operation of the water network project,a refined three-dimensional seepage numerical analysis model was established based on the West Water Diversion Project in Sanya.Using the stable seepage theory,the simulation calculation of the seepage field of the water conveyance tunnel in the environmentally sensitive area was carried out.The distribution characteristics of the seepage fields,such as pore pressure,seepage velocity,and leakage volume,were studied,and the numerical analysis results were verified by combining with on-site water quality monitoring results.The research results indicate that under the condition of failure of the anti-seepage layer,the pore water pressure field around the tunnel and below the tunnel is formed by the seepage of groundwater through the tunnel.The pore pressure in most areas between the landfill and the tunnel is less than 0,and there is no hydraulic connection between the environmentally sensitive area of the water conveyance tunnel and the existing landfill,which has no impact on the water quality pollution of the water conveyance tunnel;The on-site monitoring results reveal that the water quality of the water conveyance tunnel is mainly affected by geological conditions,which proves the rationality and accuracy of the numerical simulation results.The research results can provide reference for the design of water conveyance tunnels in similar environmentally sensitive areas.

Abstract:Based on the water diversion project of Gongyi,this paper discusses the theoretical basis and technical scheme of water resource allocation and water diversion project design.In view of the long-term water shortage problem faced by the central urban area of Gongyi and the five eastern towns,the feasibility of the combined water supply mode of South-to-North Water Diversion and Yellow River water is analyzed,and the optimization design methods for the site selection of water diversion pipelines and the layout of pumping stations are proposed.Analysis of Water Resources Supply and Demand shows that The total water demand of Gongyi in 2025 is 64.129 million m³/a.A combined water supply plan of 20 million m³/a from the South-to-North Water Diversion Project and 22 million m³/a from the Yellow River has been determined.Based on the calculation of the engineering water price and the financial rate of return,the profit water price is 1.292 yuan/m³,and the financial internal rate of return(after tax)is 4.77%.When the water price rises to 1.391 yuan/m³,the return on capital increases to 11.34%,and the economic feasibility is relatively high.The results show that after the completion of the water diversion project,it can effectively enhance the level of urban and rural water supply integration in Gongyi,alleviate the shortage of water supply,and has strong social benefits and economic value,providing a practical reference for similar water diversion projects in the Central Plains region.

Abstract:To promote the in-depth application of digital twin technology in the field of river and lake health management in Ningxia,taking the Qingshui River Basin as a typical research area,a river and lake health digital twin platform is constructed.By building a digital twin data base for river and lake health,batch and real-time storage and efficient management of multi-source heterogeneous data can be achieved;This paper has constructed a river health assessment index system applicable to the Qingshui River Basin,developed a river and lake health diagnosis model,built an application system for Ningxia's river and lake health business,integrated various data resources through spatial visualization,and formed a"River and Lake Health One Map"application support capability that integrated digital scene construction,data element management,map services,and spatial analysis functions.Functions such as river and lake health warning and evaluation were Implemented.The ability of business personnel in information resource statistics and problem handling was enhanced.The research results can provide demonstration and reference for the assessment of river and lake health and the construction of digital twin river and lake systems in arid and semi-arid regions of China.

Abstract:In response to the people's expectations for a better life,ecological environment protection has become an important part of comprehensive governance.This not only requires judicial organs to fulfill their duties in accordance with the law and properly balance"fairness and efficiency",but also requires a combination of prevention and governance through multiple measures.At present,there is still relatively insufficient systematic research on judicial collaboration in the field of environmental governance.It is necessary for judicial organs to unify case trial standards based on comprehensive consideration of various factors,expand the path for multiple subjects to participate in collaborative governance,carry out extensive cooperation with relevant subjects,jointly promote the formulation of governance plans through negotiation mechanisms,and continuously improve relevant legal basis.In the context of informatization,we should rely on Internet technology to build a comprehensive platform for environmental information exchange and sharing,strengthen the dynamic supervision of environmental information,and provide an effective channel for public participation in collaborative governance.At the same time,it is necessary to improve the comprehensive system of ecological and environmental justice in river basins,establish specialized environmental protection judicial institutions,strengthen the construction of professional talent teams in environmental justice,and promote the coordinated and balanced development of judicial governance capabilities and levels in different regions of the river basin.

Abstract:To improve the development and utilization level of Shentou Spring water resources,an investigation on the regional water resources was conducted,and water resource allocation plans were studied.The exploitable amount of Shentou Spring karst water is 5.35 m3/s(168.72 million m3/a).In 2020,the development and utilization degree of Shentou Spring karst water was 65.2%,with a karst water well extraction of 45.0852 million m3,accounting for 41.0%of the total exploitation and utilization amount.Combining the results of the comprehensive water resource allocation,planning and allocation of the development and utilization of Shentou Spring water resources for various counties and districts in Shuozhou were carried out.It can provide a reference for determining water resource allocation plans in similar areas.

Abstract:Wu'an City,located on the eastern foothills of the Taihang Mountains in Hebei Province,has a complex terrain and experiences concentrated summer rainfall,making it prone to extreme flooding.Therefore,conducting flood disaster analysis is essential for flood control safety.This paper takes Huoshui Township in Wu'an City as the study area,and through designing rainstorm flood calculations,evaluating current flood control capacity,and analyzing warning indicators,systematically analyzes and quantifies the disaster risk and flood control capacity of four typical villages.The results show that Huoshui Village,where three rivers converge,forms a flood peak gathering point,with a 100-year return period flood peak flow of 824 m³/s.Its flood control capacity is the weakest,significantly lower than that of other villages.The warning indicators show that soil moisture significantly affects the critical rainfall,with Huoshui Village requiring a higher critical rainfall due to its large drainage area,while Baiwangzhuang,due to its small watershed area and large terrain drop,is most sensitive to rainfall.The research results provide technical support and references for refining flood disaster prevention plans for Wu'an City and other mountainous counties.