Abstract:The Yongding River Water Diversion Project is the main source of production and domestic water supply for Beijing.Its headwater,the Sanjiadian Water Conservancy Hub,is the first controlling water conservancy project connecting the Guanting Gorge section and the plain section of the Yongding River,playing a key role in providing water for urban development in Beijing and the construction of river and lake ecological environments.This paper analyzes the history of water resources dispatching and current development status of the Sanjiadian Water Conservancy Hub over more than 60 years,summarizes the achievements in water resources,water ecology,and water economy,and identifies existing problems.With the construction of the Hexi branch and West Storage Project,as well as the continuous updating of water management concepts in the new era,relevant measures and suggestions are proposed for the dispatching operation of the Sanjiadian Water Conservancy Hub under new conditions,which are of great significance for further improving regional water resources dispatching and management.

Abstract:Under the influence of climate change and urbanization,river regulation has become extremely crucial,especially in the densely populated Lixiahe Area.The advancement of surveying and mapping technology has provided important support for river regulation.Due to the complexity of the river channels in this area and the influence of various factors,advanced surveying and mapping technologies are urgently needed.These technologies can improve planning accuracy and efficiency,help understand key river information,and be used for monitoring and evaluation.This paper will analyze the application of surveying and mapping technology in river regulation,evaluate its effectiveness,and propose optimization strategies.Through case analysis and data model evaluation,it will verify the effectiveness of the technology and provide reference for improving the efficiency and quality of similar river regulation projects.

Abstract:Irrigation areas are important core production areas for grain and high-quality agricultural products in China,and are key infrastructure for ensuring national food security.They not only play an important role in promoting agricultural economic development and rural revitalization,but also have significant comprehensive benefits in promoting water resource conservation and intensive utilization,improving the ecological environment,conserving water sources,and reducing wind and sand hazards.With the goal of building an integrated monitoring and perception system for large-scale irrigation areas,based on technologies such as satellite remote sensing,UAVs,and ground sensors,combined with the current situation and existing problems of large-scale irrigation area operation and management,a comprehensive monitoring capability system covering space,air,and ground is constructed to achieve effective monitoring and perception of all elements and operation management processes of irrigation areas,providing strong monitoring technology support for the modernization development of large-scale irrigation areas.

Abstract:In recent years,extreme weather events such as heavy rainfall have occurred frequently,causing slope instability in hilly areas,which seriously affects the safe operation of engineering projects.Exploring scientific and effective geological investigation methods for slopes and revealing the evolution mechanism of landslides is of significant importance.Taking the slope at Tangou Landfill in Anyang as the research object,this paper combines microtremor exploration with traditional investigation methods.By integrating and interpreting multi-source survey results,differences between the landslide body and undisturbed soil in terms of strength and wave velocity are identified,the slip surface location is determined,and the range and boundary of the landslide body are clearly delineated.On this basis,the causes of landslide formation and its evolution mechanism are analyzed,and corresponding prevention,control,and monitoring suggestions are proposed.The research results can provide a reference for geological investigation and slope management in similar projects.

Abstract:Aiming at the adverse effects of backfilling on the installation and structural safety of the immersed tunnel foundation at the connection section of the east artificial island of the Hong Kong-Zhuhai-Macau Bridge,caused by bank flow and the"island head effect",this paper adopts a source-level backfill control method using steel plate covers to carry out stability design and stress characteristic analysis of the scour-prevention structure.Based on the 100-year and 20-year return period wave conditions,two calculation models,namely vertical and sloped revetments,are established.The combined effects of wave action and hydrodynamic forces on the stability of the toe-protection components are systematically considered,and the optimal ballast parameters for the scour-prevention steel plate are ultimately determined.The results indicate that the steel plate cover source-level backfill control technology can effectively mitigate the adverse impacts of continuous backfilling on the installation accuracy and structural safety of the immersed tunnel.The analysis method and ballast calculation approach can provide a reference for the design of scour-prevention structures and determination of ballast parameters in similar large-scale projects.

Abstract:The issue of dam seepage is crucial for the safe operation of reservoirs.Taking the Zhongzhuang Reservoir in Ningxia as an example,this paper comprehensively analyzes the causes of seepage at the end of the downstream seepage cut-off trench at dam stake number 0+780 through on-site inspection,analysis of safety monitoring data,and two-dimensional finite element numerical simulation.Combined with the numerical simulation of the dam body infiltration line and single width seepage flow results,the seepage safety of the Zhongzhuang Reservoir dam operation was determined.This paper provided a scientific basis for the seepage safety assessment of the Zhongzhuang Reservoir dam,and reference for the seepage safety assessment of similar small and medium-sized earth rock dam reservoir projects in China.

Abstract:This article is based on a certain asphalt concrete core wall dam reservoir project in Xinjiang.Considering the nonlinear characteristics of the dam filling materials,the finite element method is used to simulate two different situations of the reservoir dam construction completion period and the water storage period.The stress and deformation characteristics of the asphalt concrete core wall dam are calculated and analyzed.The results show that the overall settlement of the dam body during the construction period is 0.39%,which meets the requirements of the specifications.The internal stress level of the dam body and foundation is not high,and there is no overall shear failure stress condition.The core wall is under compressive stress,and hydraulic splitting will not occur.The overall safety and reliability of the dam can provide reference for the design of asphalt concrete core wall dam reservoir projects of the same level.

Abstract:Using the Lizheng Geotechnical Software and the simplified Bishop Method,a stability analysis was conducted on the excavated soil slope of the warping dam spillway.According to different layout schemes,it was found that the excavation depth has a direct impact on the anti slip stability coefficient of the slope.After adjusting the engineering layout plan to reduce the excavation depth,the anti slip stability coefficient of the spillway excavated slope under various working conditions meets the specification requirements,the slope body is stable,and the slope protection design meets the engineering safety requirements.Through the case study of a warping dam project in a county of Yuncheng,Shanxi Province,this paper demonstrates the impact of reducing slope excavation depth on the anti slip stability coefficient,providing reference for the stability analysis of similar engineering slopes.

Abstract:Water security is an important component of national security,relating to resource security,ecological security,economic security,and social security.Evaluating Beijing's water security in the new era,summarizing existing problems,and proposing countermeasures is of significant guidance for improving the city's water security assurance.This paper establishes a comprehensive water security assessment indicator system for Beijing based on the"natural-social"dual water cycle,and uses a model of water security degree calculation combining single-indicator quantification,multi-indicator synthesis,and multi-criteria aggregation to evaluate Beijing's water security from 2012 to 2022.The results indicate that the water security index of Beijing steadily increased during 2012-2022,with the water security situation improving year by year.The water security degree improved from a basically safe level in 2012 to a relatively safe level in 2016,and further reached a safe level in 2021.Based on the assessment results and projections for future water security,this paper proposes countermeasures for water security in Beijing,aiming to provide reference and guidance for research on the city's water security assurance.

Abstract:The lower reservoir of the Dianbai Pumped Storage Power Station in Guangdong adopts a concrete gravity dam.From the perspective of economic efficiency and construction convenience,the optimal choice is to use excavated materials from the underground chambers as concrete aggregates.Therefore,it is necessary to study the alkali reactivity characteristics of the excavated materials in the lower reservoir chambers to determine the alkali reactivity properties of the aggregates.For aggregates with potential alkali reactivity hazards,experimental studies are also required to identify effective mitigation measures,providing scientifically accurate experimental data to support subsequent design,construction,and aggregate selection.

Abstract:This paper delves into the valuable experience of comprehensive governance for urban black and odorous water in Binzhou.Through a comprehensive investigation of the current state of black and odorous water,pollution sources were identified,and a scientifically reasonable governance plan was formulated.A series of effective measures were implemented,including pollution interception and pipe network management,dredging and desilting,and ecological restoration,while also emphasizing the establishment of a long-term management mechanism with enhanced supervision and assessment.During the governance process,social capital was actively introduced to promote technological innovation,improving governance efficiency and quality.In addition,publicity and guidance were strengthened to raise public environmental awareness,creating a positive atmosphere where the entire society works together and stimulating enthusiasm for participation from all parties.Through these efforts,Binzhou has achieved significant results in the comprehensive governance of urban black and odorous water,providing valuable experience and reference for other cities.

Abstract:In order to analyze the impact of return flows generated after the operation of the Pagu Reservoir Project on the surrounding water environment,a one-dimensional hydrodynamic and water quality coupled model of the reservoir drawdown area is established based on the hydrodynamic and water quality modules of MIKE11,and the variation of river water quality in the drawdown area is predicted and analyzed.Based on the MIKE11 water quality model,this paper predicts and analyzes the longitudinal variation of water quality along the Nimumaqu River downstream of the dam site under a P=95%hydrological year,as well as the intra-annual variation of water quality at key water source sections downstream of the dam site.According to the prediction results,in a P=95%hydrological year,with the inflow of downstream point sources and agricultural non-point sources,the concentration of pollutants in the river increases.The pollutant concentrations along the Nimumaqu River and at key water source sections are slightly higher than the current levels,but still meet the Class Ⅲ standard,indicating that the impact on the water quality of the Nimumaqu River and key water sources is relatively small.

Abstract:Taking the Wenyu River as an example,this paper analyzes and determines the goals of river habitat restoration based on multiple aspects,such as historical changes of the river,ecological baseline survey results,and planning positioning.The habitat restoration strategies are discussed from the perspectives of improving the connectivity of river ecological corridors,increasing deep pool habitats,constructing river island habitats,enriching shallow beach habitats,diversifying water flow patterns,restoring farmland habitats,and optimizing plant communities.Based on the characteristics of biological growth and reproduction,as well as the laws of ecosystem development and evolution,operational and management suggestions are provided.The strategies aim to enhance biological diversity in river ecological governance projects and improve the self-maintenance ability of aquatic ecosystems.

Abstract:Boxing County of Binzhou,Shandong Province,is one of the water-receiving areas of the eastern route of the South-to-North Water Diversion Project.Following the completion of the follow-up supporting projects,Boxing County will face a multi-source water supply pattern consisted of surface water,groundwater,Yellow River water,and Yangtze River water.Price disparities have led water-receiving areas to regard Yangtze River water from the South-to-North Water Diversion Project as a backup source,making it difficult for Yangtze River water to receive treatment equal to that of Yellow River water and local water resources.Based on the regional comprehensive water price reform,this paper investigates and forecasts water demand only for non-agricultural water users of Dayuzhang Qushou Reservoir and Boxing Reservoir.Through water demand forecasting and available water supply analysis,a water resources allocation scheme oriented toward regional comprehensive water price reform is proposed.The results can provide a reference for regional comprehensive water price reform in water-receiving areas of the South-to-North Water Diversion Project.

Abstract:The hydropower station project in Pakistan is a long tunnel diversion-type hydropower project with complex geological conditions and high construction difficulty.When tunnel construction encounters adverse geological units such as large lithological boundaries,major faults,fracture zones,densely jointed zones,weak rock masses,areas prone to rockburst,or sections susceptible to water inrush and sudden water inflow as discovered or inferred by preliminary surveys,advance geological prediction,as an important technical measure for tunnel construction safety and schedule management,plays an irreplaceable role.Among them,the integrated method of ground-penetrating radar and infrared water detection is not only efficient but also effective,which can effectively prevent blind construction and guide safe and efficient tunnel construction.

Abstract:Water-sediment variation is an important factor affecting river ecological health.In recent years,under the combined effects of climate change and human activities,the water-sediment characteristics of the Ganjiang River have changed significantly.To investigate the water-sediment variation characteristics and their causes in the Ganjiang River,this paper is based on data from 40 meteorological stations in the Ganjiang River basin and Ganjiang River hydrological data from 1960 to 2018,sorting out water-sediment variation characteristics in different periods and quantitatively analyzing the attribution of water-sediment variation.The results show that precipitation and runoff in the Ganjiang River basin both show a non-significant increasing trend,while sediment transport shows a significant decreasing trend;the difference in precipitation-runoff relationship over time is significantly smaller than that in precipitation-sediment transport relationship,especially after the construction of the Wan′an Reservoir,where the difference becomes even more pronounced.Sediment reduction by the Wan′an Reservoir mainly occurs from March to October,of which the sediment reduction from March to June accounts for 77.3%of the annual total;large reservoirs on the main stream of the Ganjiang River have significantly stronger sediment reduction capacity than those on tributaries.Overall,climate change is the main cause of the increase in runoff,while human activities play a dominant role in runoff variation and sediment transport reduction.The research results can provide reference for water-sediment regulation,reservoir operation management,and river ecological protection in the Ganjiang River basin.

Abstract:Taking five watersheds in Langfang City—Sanhe,Xiluocun,Beichang,Gengsheng,and Jingezhuang—as the research objects,this paper first applies the principal component analysis(PCA)method to reduce the dimensionality of ten topographic and geomorphologic characteristic indices of the watersheds,including watershed area,channel slope,total river network length,river network density,main channel length,watershed length,form factor,average watershed slope,average elevation difference,and average watershed elevation,and extracts two principal components that can comprehensively reflect the original characteristics.Then,an objective weighting method is used to assign weights to the principal components,quantifying the similarity among watersheds.As a result,two pairs of similar watersheds—Sanhe-Xiluocun and Beichang-Gengsheng—are identified,for which parameter transfer can be carried out.The research results provide a basis for identifying reference watersheds for hydrological forecasting in ungauged regions in the future.

Abstract:The lower reaches of Gufeng River Basin are located in the eastern part of Nanling County,Anhui Province,at the confluence of Qingyi River and Zhanghe River.It is an important part of the"Three Rivers Basin"of Shuiyang River-Qingyi River-Zhanghe River in the lower reaches of the Yangtze River.The region features compound landforms of hills,plains,and polder areas,with complex water system structures and obvious superimposition effects of upstream and downstream floods,placing great pressure on the flood control and waterlogging prevention system.In recent years,affected by changes in regional engineering conditions and hydrological regimes,the original flood control and waterlogging prevention system can no longer meet the needs of economic and social development in the new era.Based on the assessment of the current flood control capacity of the basin,this paper proposes a planning and treatment scheme,conducts multi-scheme comparison based on engineering quantity,investment estimation,and implementation feasibility,and determines the engineering scheme meeting the planned treatment standards.Meanwhile,the project scale is verified through flood routing calculation.The research results can provide reference for flood control and waterlogging prevention planning in hill-plain-polder compound small basins.

Abstract:This paper focuses on the operation and maintenance management of groundwater in Xilin Gol League,aiming to address the existing issues in groundwater management and achieve sustainable water resource utilization.Through literature review,field research,and case analysis,the current situation is thoroughly analyzed.The study found that Xilin Gol has accumulated experience in groundwater management,including the development of policies and regulations,as well as the application of technical measures.However,there are still issues such as an incomplete management system and limited technical capacity.Based on this,optimization strategies are proposed,including innovating the management system,strengthening technical support,utilizing economic measures to encourage social participation,and formulating strategies to adapt to environmental changes.The research results provide important reference value for improving groundwater management in Xilin Gol and ensuring the rational development and utilization of regional water resources.

Abstract:To understand the current status of eutrophication in Shajingzi Reservoir and propose appropriate treatment measures.Through conducting water environment status surveys and sampling analysis,nutrient levels and algal composition were determined,and the degree of eutrophication was evaluated.The results show that the water body of Shajingzi Reservoir is already in a state of severe eutrophication.Further analysis of the applicability of conventional eutrophication treatment technologies to this reservoir reveals that existing conventional treatment measures cannot meet the treatment needs of Shajingzi Reservoir.On this basis,countermeasures and suggestions such as increasing external clean water supply and implementing in-situ chemical dosing emergency treatment for high-algae water bodies are proposed.The research results can provide reference for eutrophication treatment of Shajingzi Reservoir water body.