Abstract:The water conservancy projects managed by the Tuancheng Lake Management Office are diverse and scattered,which is difficult to manage.However,the construction of standardized management for water conservancy projects started early and has been carried out for many years,with significant results.A standardized management system has been gradually formed.This article combines years of standardized management construction practice,summarizes the experience and shortcomings in institutional system construction,engineering safety management,engineering operation management,information management,etc.,and provides suggestions and reflections on management system construction,organizational support,personnel training,information construction,etc.,for other water system management units to refer to and learn from,and to promote the construction of standardized management of water conservancy project operation in Beijing and even the whole country.

Abstract:Flash flood disasters are characterized by strong suddenness and high destructive power,posing serious threats to the lives and property of residents in Wuan City and affecting regional sustainable development.To understand and grasp the flood evolution patterns in small watersheds within Wuan City and provide scientific data support for flash flood disaster prevention,this paper conducted a historical flood investigation in the small watershed of Mahui River as an example.Methods including community interviews,flood mark surveys,cross-section measurements,and hydrological calculations were employed.The analysis determined that the flood peak of Mahui River in 2021 was 466 m³/s,with a return period of 30 years.The investigation and analysis results provide technical support for risk assessment,optimization of early warning and forecasting systems,and non-structural mitigation measures for flash flood disasters in small watersheds of Wu'an City,and have significant practical implications for enhancing regional flash flood disaster defense capacity.

Abstract:With the acceleration of urbanization,the water ecological pressure in the Chaohu Lake Basin is increasing,and scientific and efficient monitoring and governance are urgently needed.Remote sensing technology has become an important technical means for land use research due to its wide coverage,high update frequency,and relatively low cost.Taking Chaohu Lake as the research area,based on the 16 m multispectral images of HJ-2A/B satellite for environmental disaster reduction,three land use classification methods were systematically compared:band analysis(single band,INDW,IRSW,INDV),unsupervised classification(cluster analysis),and supervised classification(random forest method).By constructing a classification system for water bodies,vegetation,buildings,cultivated land,and unused land,the accuracy of the classification results is evaluated using confusion matrix and K coefficient.The results show that the band threshold method is easy to operate,but it is greatly affected by subjective threshold settings and has limited ability to extract land cover information.Unsupervised classification method can effectively extract land cover types with obvious spectral features,but its classification performance for land cover with insignificant feature differences is poor.Supervised classification method can fully utilize prior sample information and multidimensional spectral features,accurately identify various types of land use,and effectively reduce the misjudgment rate.At a resolution scale of 16m,supervised classification is the optimal solution for extracting land use information in the Chaohu Lake area.The research results can provide current and reliable data support for the integrated management of"mountains,waters,forests,fields,lakes,and grasslands"in Chaohu Lake,as well as the establishment of national spatial control and water ecological compensation mechanisms.

Abstract:Budget performance management can effectively improve the efficiency of financial fund utilization and ensure the smooth implementation of engineering projects.During the project budget application stage,a performance target table must be prepared,performance monitoring and analysis of execution deviations must be conducted during the budget execution process,and unit performance self-evaluation must be conducted after the project is completed.Performance management work runs through the entire process of the project.Therefore,it is particularly important to set performance goals reasonably and use performance self-evaluation results reasonably.The implementation and effectiveness analysis of budget performance management in water conservancy engineering operation and maintenance projects have practical significance and can provide reference and guidance for similar work.

Abstract:Jiyun River,as an important estuary channel of the Haihe River system,not only conveys upstream floods but also bears drainage responsibilities along both banks.During the rainy season,when the southeastern flow of the Chaobai River intersects with the downstream river water and seawater of Jiyun River under tidal conditions,obstructions occur,forming rapid currents and vortices.The river is meandering with gentle slopes,leading to frequent flood and waterlogging disasters on the Jiyun River Plain.Based on measured data,the hydrological characteristics of floodwater,waterlogging,and tidal interactions in Jiyun River are analyzed,and six characteristic years—1962,1994,1959,1967,1969,and 1984—are selected to represent the occurrence patterns and combination modes of floodwater and waterlogging events.The modern hydrological monitoring and forecasting concept of the"three lines of defense",the collaborative operation strategy of engineering systems,and the theory of resilient flood control are systematically introduced into the management practice of Jiyun River.A multi-dimensional solution is proposed,encompassing integrated space-sky-ground monitoring,forecasting,and early warning,joint regulation of reservoirs,sluices,and flood detention areas,systematic river channel management,and digital technology empowerment,promoting the transformation of the flood control and drainage system of Jiyun River from traditional engineering defense to a resilient system with forecasting and early warning,precise operation,and rapid recovery capabilities.

Abstract:Water resources are a fundamental constraint for sustainable social development.This paper takes the Green Circular Economy Industrial Park in the Beijing Sub-Center as the research object.Considering the park's location in the restricted groundwater exploitation area of Yongledian Town,Tongzhou District,where current water supply fully relies on Quaternary groundwater and the annual water withdrawal is limited by a 23.26 million m³"red line",the study adopts a"dual control of supply and demand"analytical method.Based on the industrial types planned for the park,water demand is calculated,and the water resources conditions of Yongledian Town are systematically analyzed using hydrogeological survey data.The results indicate that,from the perspective of water quantity,the Quaternary groundwater in Yongledian Town is currently not over-extracted,and the water resources can meet both the town's current demand and the water requirements of three planned projects in the industrial park.However,from the perspective of water quality,the shallow groundwater in the area is mainly Class IV with poor quality.The water level of the deep groundwater,currently the main water source,declined by approximately 4.16 m from 2015 to 2022,and although it rebounded about 0.82 m in 2023-2024,the area still faces a significant risk of"water shortage due to poor water quality".The study shows that the industrial park's planning is generally compatible with regional water resources in terms of quantity,but water quality safety has become a critical bottleneck restricting its sustainable development.The research results provide quantitative support for implementing the principles of"urban planning based on water,land allocation based on water,population planning based on water,and industrial development based on water",and offer a reference for optimizing industrial layouts in groundwater over-exploitation areas in the Beijing-Tianjin-Hebei region.

Abstract:The issue of property ownership of rural collective reservoirs is related to the safety and efficiency of reservoir operation.Throughout the years,the property rights system of rural collective reservoirs has been plagued by issues such as the virtualization of property rights entities,unclear responsibilities and rights,and chaotic management.Water rights reform is the core of the current rural water conservancy reform,with the aim of establishing a modern water rights system.It will also force people to clarify ownership and responsibilities for rural collective reservoirs,activate reservoir resources,and improve water resource utilization efficiency and safety through clarifying property rights,activating values,strengthening management,optimizing allocation,and other means.There are still some challenges and difficulties in water rights reform in reality,which require coordinated planning and multi-party cooperation to better promote water rights reform and enable rural collective reservoirs to exert economic and social benefits.

Abstract:Research on initial water allocation schemes in river basins has rarely addressed their effectiveness,which restricts the advancement of initial water allocation work in river basins and intensifies public concern regarding the effectiveness of allocation schemes.To assess the effectiveness of initial water allocation schemes in river basins,this paper proposes criteria for effectiveness assessment based on the current water use of the riparian provinces(regions)and the actual demand for reserved emergency water.An effectiveness assessment model for initial water allocation schemes in inter-provincial river basins is then constructed,and an application study is conducted using the Daling River Basin as an example.The results show that the initial water allocation scheme in the Daling River Basin exhibits relatively good effectiveness.On this basis,combined with the assessment results,countermeasures and suggestions for improving initial water allocation schemes in river basins are proposed.

Abstract:Climate change and human activities have affected surface runoff in the Dongbing River Basin,the main inflow river of Dongfeng Reservoir,resulting in a gradual decrease in inflow and posing a threat to the water supply security of downtown Yuxi City.To analyze the quantitative impacts of climate change and human activities on runoff in the Dongbing River Basin,this paper is based on observed runoff data from Dayizi Hydrological Station and precipitation data from Anhua and Dayizi rain gauge stations from 1980 to 2024.Methods including water balance,statistical analysis,and separation evaluation were applied to analyze the evolution characteristics of rainfall-runoff in the basin and to quantify the contribution of climate change and human activities to runoff variations.The main results are as follows:The multi-year average natural runoff of the Dongbing River Basin is 31.88 million m³,with a coefficient of variation(Cv)of 0.35.The multi-year average total water consumption shows an increasing trend,dominated by agricultural water use;The basin's multi-year average precipitation is 942 mm,with a Cv of 0.15.The runoff coefficient is positively correlated with precipitation,indicating that rainfall is an important factor affecting runoff in the Dongbing River Basin.However,the intra-annual distribution of rainfall and runoff is highly uneven,and runoff peaks lag behind precipitation peaks;Both precipitation and runoff exhibit significant decreasing trends,with abrupt change points around 2008 and 2003,respectively;Climate change and human activities jointly contributed to the reduction of runoff in the Dongbing River Basin,with contribution rates of 53.0％and 47.0％,respectively.The results of this study provide scientific reference for the protection of the Dongfeng Reservoir water source and for scheduling water supply security in downtown Yuxi City.

Abstract:This paper takes the 220 kV Substation Project in the Dongming Petrochemical Park,located in the western plain area of Nansi Lake,as an example.Based on the continuous long-term measured rainfall data from Lizhuangji and Dongming stations,the design storm flood analysis was carried out using both the comprehensive instantaneous unit hydrograph method and the flood peak discharge formula method for the western plain area of Nansi Lake,as outlined in the Hydrological Atlas of Shandong Province.The results of the two methods were then compared.The analysis shows that the total flood volume at the site of the 220 kV substation with a return period of P=1％(100-year flood)is 1,400×104 m³,and the design flood level is 56.15 m.Under design storm flood conditions,short-term water accumulation may occur in the plant area,necessitating the construction of drainage facilities.The analysis results can provide a basis for the implementation of the Dongming Petrochemical Park 220 kV Substation Project,and the research methods have reference value for the estimation of design floods in small watersheds in plain areas.

Abstract:In order to ensure the safe and stable operation of eccentric spherical valves under sediment-laden flow conditions,this paper investigates the variations of valve hydraulic characteristics under different valve openings,sediment concentrations,and inlet flow velocities,based on a combination of numerical simulation and field experiments.The hydraulic characteristic patterns of the eccentric spherical valve during operation are analyzed and summarized,and relevant protective measures are proposed in terms of structural improvement,material selection,and valve opening and closing rules.This provides theoretical basis and technical support for its normal operation in sediment-laden flows.This study is of significant importance for the long-term safe and stable operation of hydropower stations.

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:Taking the Jiyun River Estuary Pumping Station as the engineering background,this paper proposes an overall foundation pit construction approach of"staged excavation combined with permanent and temporary structures"to address complex pit conditions,including proximity to levees,cross-flood-season construction,and localized artesian water.The first-phase foundation pit mainly covers the intake chamber,main pump house,and outlet chamber,where TRD cement-soil walls and tri-axial cement-mixing piles are used in zones to form cutoff curtains.Hidden beams and stainless steel counterblocks are arranged on the pit floor to form a bottom strut system.The second-phase foundation pit,for the intake and outlet channels,adopts sloped excavation combined with densely arranged mixing pile composite foundations to meet bearing capacity and settlement control requirements.Analysis results show that the overall force coordination of the foundation pit design is good,and the deformation of the retaining structure is within a controllable range,providing favorable conditions for expanding construction space and ensuring smooth project implementation.The research results can provide a reference for the design of deep-shaft through-flow pumping station foundations with large flow rates.

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:This paper conducts a non-stationary analysis of the maximum flood peak discharge of Wangkuai Reservoir in the Daqing River Basin,and calculates the reservoir flood return period under non-stationary conditions.It describes the influence of environmental changes and underlying surface conditions of the reservoir on the flood return period.The research method employed is the Generalized Additive Model for Location,Scale,and Shape(GAMLSS)based on the time-varying moment model.A non-stationary flood frequency analysis was performed on the maximum flood peak discharge of Wangkuai Reservoir.Model parameters were evaluated using the AIC criterion,and the optimal parameter model was selected to calculate the flood return period under non-stationary conditions.The results indicate that the maximum flood peak discharge of Wangkuai Reservoir shows a significant declining trend and change points,effectively reflecting the impact of continuously changing environmental and hydrological factors on flood risk assessment.

Abstract:To address issues such as insufficient ecological water for fish breeding periods and the flattening of hydrological processes during reservoir operation,a reservoir ecological operation model based on dynamic optimization strategy is developed.Key natural hydrological indicators are extracted using an iterative peak-seeking algorithm,and an"initial water level-operational water level-ecological response"elasticity relationship model is established.Under the premise of ensuring a water supply security rate of no less than 95％,the ecological pulse process is optimized.A case study is conducted for the Maiwan Reservoir on the Nandu River in Hainan Province.Results show that by regulating the ecological operating water level in June-July,the recurrence period of ecological pulses can be shortened from 2.5 years to 1 year,and the recurrence probability of ecological minor floods increases to 94.7％,effectively achieving coordination between water supply security and ecological needs.The study indicates that this method provides a technical pathway for reservoir ecological operation in river basins that balances hydrological process reconstruction with water resource security,offering favorable environmental benefits and engineering applicability.

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:Against the background of ecological civilization construction and the extension of water conservancy functions,water conservancy scenic areas urgently need to break through the bottlenecks of traditional development models and achieve high-quality transformation.Focusing on the design of transformation paths,a systematic solution is proposed:guided by conceptual transformation,establishing ecological priority,human-centered coordination,and sustainability;centered on product transformation,building a diversified and in-depth"water conservancy+"experience system;driven by technological transformation,enhancing service efficiency through intelligent management platforms;supported by management transformation,innovating cross-departmental collaboration and community co-governance mechanisms;and elevated through brand transformation,shaping a distinctive and value-oriented image.The study emphasizes the synergistic effect of these five transformation dimensions,which is the key path to achieving the unity of ecological protection,water conservancy safety,and industrial benefits.It can provide theoretical reference for related policy formulation and scenic area practice,promoting water conservancy scenic areas as important carriers of sustainable development.

Abstract:The seepage control system of concrete face rockfill dams is crucial for the safe operation of the dam body.Some projects,due to geological conditions or construction cost limitations,cannot set up a downstream measuring weir and must rely on piezometers to monitor the seepage condition.However,because of high permeability in the foundation and rapid decline of the phreatic line,traditional piezometer layouts often lack monitoring sensitivity.This paper investigates the effectiveness of piezometer placement in monitoring the seepage condition of the concrete face through theoretical analysis and three-dimensional finite element seepage simulation,and establishes a piezometer monitoring model.Results indicate that the pore pressure at the foundation bottom increases with higher vertical joint permeability;piezometers placed at the foundation bottom near vertical joints are highly sensitive to deterioration in the lower part of the concrete face and along the full vertical joint,but respond relatively weakly to deterioration in the middle and upper parts.A further piezometer monitoring model considering water pressure,temperature,and time-dependent factors is established,and its predictions are generally consistent with field inspection results.The findings provide theoretical basis and technical support for piezometer layout and seepage condition assessment in projects without downstream measuring weirs.

Abstract:To meet the demand for water supply security,layered intakes are widely used in water conservancy engineering,and different types of intakes have their respective advantages and disadvantages.Taking the Meihuashan Reservoir Intake Project as a case study,this paper,based on the actual conditions of the region,innovated on the traditional tower-type layered intake and designed a new type of steel structure layered intake,which has been practically applied in Meihuashan Reservoir,Fujian Province.In the practical application of this intake project,analysis and summary were conducted on aspects such as layered height,well diameter selection,and wall thickness selection.Furthermore,the advantages and limitations of steel structure layered intakes were discussed,providing reference for the implementation of similar projects.