In order to solve the problem of benefit sharing amount, a quantitative model was established, and a case study was conducted on the application of the model and the corresponding benefit distribution ideas. The results indicate that the stakeholders of hydropower development projects mainly include the central government, local governments, hydropower enterprises and reservoir immigrants, and the net present value method can be used to construct the benefit sharing model, in which the stakeholders take the product of the sum of the present value of net cash flows of hydropower projects and their input shares as the sharing amount. The grey prediction method was used to solve the model. The case of Xiluodu Hydropower Station proves its rationality. It is suggested to establish a development fund for immigrants and safeguard the interests of other parties to open up a new situation of co-construction and win-win of hydropower development.

With the development of the city, the contradiction between urban water supply and spring protection has become increasingly prominent, and the groundwater resources must be developed reasonably under the premise of ensuring that the spring water is not affected. Monthly rainfall and water level data of Botu Spring Group from 1990 to 2005 in Jinan area were selected to analyze the characteristics of rainfall recharge and the lagging response of water level in spring area to precipitation by statistical method. When the average of three-point movement of precipitation starts to correlate with water level in spring area, the average of ten-point movement of precipitation has the strongest correlation with water level in spring area. The current spring water level is closely related to the comprehensive rainfall in the first ten months. After ten-point moving average treatment of precipitation, through comparative analysis of groundwater exploitation data in urban area, east of Jinan and west of Jinan, it is proved that water level in spring area is closely related to groundwater hydrology unit in urban area and west of Jinan, and there is no hydraulic connection with groundwater hydrology unit in east of Jinan, so groundwater unit in east of Jinan can be reasonably exploited.

Taking the mixed-flow pump turbine as the research object, a fully elliptical volute was designed, which could meet the working conditions of the turbine and the pump. The ratio of the length and short half axis of the elliptical section of the volute was guaranteed to be fixed. The worm shell was designed by its outlet circumferential velocity and the circumferential velocity moment of each section, and the relationship between the size and flow rate of each section of the volute was given. Through CFD numerical simulation, the variation law of the circumferential velocity of the volute outlet and the circumferential velocity moment of each section was obtained. The distribution law of the velocity and pressure inside the volute was summarized, and the simulation results meet the design requirements, which has high practical application value.

Aiming at the problem of power system structure vulnerability, the advantage of multi-index evaluation can be combined with Pajek tool to identify the key nodes of power grid. First of all, based on the complex network theory, considering the power network topology characteristics, structural vulnerability evaluation index system of integrated power system was established. Secondly, in terms of evaluation methods, fuzzy comprehensive evaluation method and CRITIC method were used to calculate the subjective and objective weights of each evaluation index. Finally, combination weighting VIKOR was proposed to calculate the weight value of each node and obtain the ranking result of importance. Taking IEEE-118 system as an example and comparing with different evaluation methods, the results show that this method is feasible.

In order to illustrate the influence mechanism of flow distribution on slope of urban asphalt road, two-dimensional shallow water equations were applied to simulate runoff characteristics on asphalt slope. Comprehensive sensitivity analysis was performed on multiple factors (cross slope, longitudinal slope, slope width, slope length, rainfall intensity and roughness coefficient) which caused different degrees of ponding on asphalt slope. The maximum flow depth was taken as the sensitivity analysis index. Both range and variance analysis were performed, through which the sensitivity ranking of the influencing factors were obtained and the significance level can be clarified as well. The results show that under overflow drainage condition, cross slope, pavement width and rainfall intensity have significant effects on flow depth; Slope length has no significant effect on flow depth. Flow depth is negatively correlated with cross slope, and positively correlated with rainfall intensity, pavement width and slope length, and negatively correlated first and then positively correlated with the roughness coefficient. The research results can provide reference for engineering practice.

A turbine runner of a certain power station often produces cracks due to excessive blade stress, which threat to the safe operation of the unit seriously. To solve the problem of the turbine runner blade stress, based on RNGk- ε turbulence model, the modeling and mesh of turbine components were carried out for a bulb tubular turbine. Through the runner blade thickening and angle optimization, CFD technology was used to optimize runner hydraulic performance and strength comparative analysis. The results show that the stress and deformation of the optimized runner blade are greatly improved, which meets the actual engineering needs and can effectively avoid the generation of runner cracks.

The flow channel model and the shafting model of the turbine unit were established, and the fluid-solid coupling method was used to analyze the dynamic characteristics of the shafting system vibration of turbine unit induced by hydraulic factors under the steady-state conditions with different loads. The measured data were compared to verify the feasibility of the method. And then the correlation mechanism between the vibration characteristics and the internal flow characteristics under typical steady-state conditions was studied. The results show that the vibration characteristics of the guide bearing obtained by this method are basically consistent with the experimental values, and the trend of vibration changes with the change of load is consistent. Due to the positional relationship, the vibration characteristics of the water guide bearing and the upper guide bearing have a certain amplitude difference. The horizontal vibration amplitude of the unit is the largest due to the obvious vortex belt in the draft tube when running at 75% load condition. The research results can provide a scientific reference for the stable operation of hydropower turbine units under different loads.

In order to study the sponge urban transformation scheme of existing communities, taking an existing community in Hongshan District of Wuhan as an example, a SWMM rainfall-runoff model was established. Different LID combination schemes were determined according to the feasibility analysis of site conditions, space requirements and underlying surface characteristics. The runoff control and pollution load of each combination scheme under different recurrence periods in the study area were simulated. The simulation results of each combination scheme were analyzed from the ecological, social and economic aspects. The results show that the ecological and social benefits of biological retention facilities were high. The combination of LID facilities for laying infiltration trench, vegetative swale and biological detention facility has the best effect on runoff control, flood peak and pollutant reduction in the study area, and has good social and economic benefits, which is the best scheme.

For Guxian hydro-junction project, concrete volume is huge, and the construction period is tight, construction technology and parallel planning are key problems in the construction of high RCC gravity dam. Therefore, the simulation technology of discrete event system was introduced to establish the construction simulation model in line with the dam type characteristics of the dam to simulate and calculate the construction process of concrete partition, parallel and jump warehouse. After multi-scheme simulation, the flat inclined layer technology and the corresponding warehouse surface partition scheme were recommended, and the warehouse surface control criteria were put forward. It provides all-round data support for Guxian project, and its simulation model can be used as a reference for other similar projects.

Analyzing the dynamic evolution and current situation of development and utilization of water resources is of great significance to the sustainable development and protection of water resources. The data of 1997-2020 water resources bulletins of 10 water resources zones, including Songhua River, Liao River, Hai River, Yellow River, Huai River, Yangtze River, Southeast China, Pearl River, Southwest China, and Northwest China, were selected to analyze the dynamic evolution of water resources and the current situation of development and utilization in these zones by using Kendall rank test. The results show that there are spatial differences in the dynamic evolution of water resources in China with the Yellow River region showing a highly significant increasing trend, the Songhua River basin showing a significant increasing trend, the Huai River basin showing a non-significant decreasing trend, and the rest of the basin showing a non-significant increasing trend. The Songhua River and Yangtze River basin show a weakly significant increasing trend, while the Liao River, Hai, Huai and Southeast rivers basin show a non-significant decreasing trend; The other water resources basin all show a non-significant increasing trend. The proportion of surface water is the largest, groundwater is the second largest and other water uses is the smallest. The water consumption of agriculture and industry in China's water use structure is on a highly significant downward trend after 2013, which corresponds to an increase in the efficiency of water use in agriculture and industry, a stable level of water use in domestic use and an increase in ecological water use year by year.