The ecological and economic value of water resources is the unity of economic value, social value and ecological environmental value. It is of great significance to analyze the change rule of its value for rationally optimizing the allocation of water resources, promoting the sustainable development of the ecological and economic system of water resources. The emergy theory analysis method was used to calculate the ecological and economic value of water resources in Zhengzhou City from 2009 to 2020. Its time evolution law and influencing factors were discussed, and its future development trend was analyzed by R/S analysis method. The results show that there is a growing trend for water ecological economic value in Zhengzhou City on the whole. The value change is mainly affected by GDP, per capita disposable income, sewage wastewater emissions and other factors. The results show that the future trend in the past time series characteristics were positively related, namely, water ecological economic value in Zhengzhou City still showed a trend of growth in the future.

When the pipeline truck moves smoothly, the velocity distribution characteristics of the water flow in the annular gap are related to the interaction between the pipeline truck and the water flow, which will also affect the motion characteristics of the pipeline truck and the hydraulic characteristics in the pipeline. This paper studied the overall and local distribution characteristics of the water flow velocity in the annular gap when the pipeline car moves smoothly by means of physical experiments and theoretical analysis. The relationship between the distribution characteristics of the water flow velocity in the annular gap of the pipeline car with different diameters and the transmission efficiency were compared. The results show that when the pipeline car moves smoothly, the velocity at the inlet section of the annulus is the largest, followed by the middle section of the car, and the velocity at the rear section of the car is the smallest; The flow velocity near the wall of the pipeline truck changes greatly along the way, and the flow velocity near the pipe wall changes less along the process; The distribution of the water flow velocity in the annular gap of the pipeline car with different diameters affects the transportation efficiency of the pipeline car. When the ratio of the water flow velocity in the annular gap to the water flow velocity in the pipeline is close to 1, the transportation efficiency of the pipeline car is the highest.

In order to investigate the influence of the bottom dip angle of contraction section of the dustpan-shaped inlet on the hydraulic performance of the passage, the physical model and hydrodynamic model of the inlet structure of the dustpan-shaped inlet were established. The Reynolds N-S equation and RNG κ-ε turbulence model were adopted to simulate the flow field of the passage with 5 different underside inclinations in the inlet contraction section. The results show that the bottom dip angle increases has a great influence on the velocity distribution of the inlet contraction section and the throat of the winnowed dustpan-shaped inlet passage, and the scheme of the bottom dip angle increases the density of the srteamline distribution and the curvature of the throat, with the increase of flow velocity, the hydraulic loss of the passage is large, and the velocity distribution uniformity of the outlet section of the passage is low; The scheme with small bottom dip angle makes the streamline distribution smooth and the throat streamline curvature becomes slow, the velocity decreases, the hydraulic loss of the passage reduces, and the velocity distribution uniformity of the outlet section of the passage increases; The magnitude of the inclination of the bottom surface of the intake contraction section has no obvious influence on the weighted average angle of the flow velocity of the outlet section of the passage. Hydraulic performance of passage with different bottom dip angles was analyzed. When the bottom dip angle of the inlet contraction section of the dustpan-shaped inlet passage is less than 3°, the water flow in the inlet passage is smooth, the hydraulic loss is small, and the flow pattern at the outlet of the passage meets the water inlet conditions of the pump impeller chamber.

Carrying out quantitative assessment of regional water security is an important basis for water security diagnosis and scientific decision-making. To analyze temporal-spatial characteristics of water security in Gansu Province, an index system of 2 system layers, 6 criteria layers and 25 evaluation indexes was constructed. Based on the combination weighting method of improved AHP and entropy weight method, the weight of each index was calculated. The water security status of 14 cities (states) in Gansu Province in 2010, 2015 and 2020 was comprehensively evaluated by cloud model. The results show that the water security of each city (state) is on the rise in 2010, 2015 and 2020, and it is generally in the basic and relatively security level. The shortage of water resources and flood and drought disasters are the main restrictive factors that affect the water security in Gansu Province. Improving water resources conditions and modern water management level are the important measures to improve the water security in Gansu Province.

Aiming at the low natural moisture content of natural wide graded gravel anti-seepage soil material in 300 m level high core wall rockfill dam, field contrast test between the process of “belt conveyor filling water + stacker heap + bin stuffy material” and the process of “layered paving + pipe network water + bin stuffy material” was carried out to verify the rationality and feasibility of the relevant filling water process. The test results show that the combination process of belt conveyor with water is superior to the pipe network stratified water process, mainly manifested that the belt conveyor automatic water system can achieve real-time, efficient and accurate automatic water filling soil; After water replenishment, the soil material is transported by the belt and piled by the stacker, which can realize automatic and uniform piling. After adding water to soil material, the moisture content inside the soil material is basically stable during 3-4 days of smother, and the time required for smother is short. This paper also put forward the improvement measures of water filling process of belt conveyor. The improved process of "water filling of belt conveyor + stoker + silo boring" can provide reference for soil water content adjustment of similar earth-rock dam.

The rise and fall of reservoir water level will make the water storage environment of bank slope rocks different at different heights and water levels, and the types of water rock interaction are also different. Based on this, the deterioration test of rock mechanical properties of bank slope in water rock interaction zoning was carried out. The results show that the compressive and tensile strength of rock samples decrease with the increase of test cycle, showing a deterioration trend from fast to slow. With the advance of water rock interaction cycle, the shear failure characteristics become more and more obvious in the compressive and tensile tests of rock samples; The microstructure of rock sample gradually transits from dense to loose, porous and multi crack structure. Under different water rock interaction, the mechanical properties and microstructure deterioration degree of rock samples ranks thermal wet cycle > dry wet cycle > long-term immersion. The results can provide ideas for the long-term stability analysis of bank slope based on water rock interaction zoning.

Due to the randomness of concrete carbonation process, the results obtained by the existing carbonation depth prediction models are difficult to characterize the actual carbonation status of in-service concrete structures. Therefore, combining the existing stochastic carbonization model with the actual measurement information of the carbonization depth of in-service concrete structures, a calculation method of a priori distribution hyper-parameters was given when the mean and variance of carbonized population samples were unknown. A Bayesian random model for the carbonation depth of in-service concrete structures was established. Taking the measured concrete carbonation depth of spillway pier and other structures of Yanshan Reservoir as an engineering example, the results show that the Bayesian random model can better represent the actual carbonation condition of in-service concrete structure.

For the intersection problem of the outlet pipe shared by adjacent units of pumping station, three schemes for the intersection of the outlet pipe of the adjacent units was proposed based on the original scheme of the pump station. The influence of different intersection forms of the outlet pipe on the hydraulic performance of the pump station pipe was investigated with numerical simulation. The results show that the hydraulic losses of plan 2 and 3 were reduced by about 50% compared to the original plan. The flow field distribution before the junction point of the outlet pipes was improved obviously by the three optimization schemes. In the middle flow surface, the pressure and streamline distribution characteristics of plan 3 were better. Compared with the original scheme, plan 1 and plan 2 can improve the flow field of unit 2 and the vortex and secondary flow were reduced before the intersection point. After the intersection point, the flow field distribution of plan 2 was smoother and the hydraulic performance was better. Both the hydraulic performance of each scheme and construction were considered, plan 3 was finally determined as the optimal scheme.

In practical engineering, there are few samples of arrester failures, and it is difficult for intelligent algorithms such as neural networks to make accurate judgments. To this end, a fault diagnosis method of arrester based on Bayesian network was proposed. Firstly, the principal component analysis was used to extract 21 characteristic parameters that affect the operation of arrester. And then the extracted characteristic parameters was chosen to establish two-layer information architecture defect diagnosis model. The classification probability of different categories was calculated according to the existing real-time data. If the first classification result indicated that the arrester is abnormal, new detection evidence was added for the second diagnosis. Finally, 6 arresters under the same voltage level in a certain area were selected to analyze and verify the validity and correctness of the proposed method.

Under the influence of climate change and land use/land cover (LULC) change, the combined influence of multiple factors has significantly increased the difficulty of probable maximum flood (PMF) estimation. A PMF estimation framework was proposed, integrating post-processing of climate model results, probable maximum precipitation (PMP) estimation and future LULC change setting under climate change scenarios, impact analysis of base flow/antecedent rainfall, and similarity-based PMP spatio-temporal distribution. This new framwork was applied to the Upper Nujiang River Basin. The results show that the uncertainty of base flow/antecedent rainfall and PMP spatio-temporal distribution are important factors affecting PMF for basins, and the dual-drive of climate change and LULC change has a greater impact on PMF, and the amplitude of change increases with the degree of change.