Vertical seam fishway has gradually attracted the attention of hydraulic engineering field because it can adapt to large amplitude water level, obvious energy dissipation effect and stable flow pattern. In this paper, the influence of the length width ratio of the pond on the hydraulic characteristics of the opposite side vertical slit fishway was studied by numerical simulation. The results show that the change of the length width ratio of the pond has little impact on the dissipation rate per unit volume; The attenuation along the main flow area first increases with the increase of the length width ratio of the pond, and then remains unchanged. The larger the length width ratio of the chamber is, the closer the maximum velocity in the chamber is to the vertical joint; The ratio of the main flow velocity to the maximum flow velocity (the maximum variation of the main flow velocity along the way) is within a certain range. The length width ratio of the pond is between 1.00-1.13, which can obtain better water flow pattern, larger reflux area and better water quality in the mainstream area of the fishway.

The structure of large-scale shaft tubular pumping station is complex, the structure and size of each pouring block are different, and the temperature control index is also different. Especially in summer construction, it is very difficult to control temperature and prevent cracks. For different structural parts, refined peak clipping strength index should be adopted. In this paper, the equivalent cooling algorithm was used to simulate the peak-cutting intensity of cuboid pouring block under different water pipe layout, water temperature and water flow rate with different hydration heat inhibitor dosage and without hydration heat inhibitor. Then a series of quantitative formulas were put forward. According to the dosage of hydration heat inhibitor and peak-cutting intensity index, the layout density and water flow rate of cooling water pipes with corresponding water temperature can be calculated with these formulas. The results can provide quantitative reference for the establishment of temperature control measures for similar pumping stations constructed in high temperature season.

Taking a reconstruction canal section in Zuncun Irrigation District as the research object, this paper studied the sediment transport characteristics and scouring and silting change law of the canal. The causes of channel siltation were analyzed by sampling suspended matter, bed sand and measured velocity. The results show that the most serious siltation occurs at the head of the canal, and the siltation during the water shut-down period is an important factor causing the siltation of the canal. The flow rate of sediment carrying under each water conveyance condition is given, which provides the basis for the reduction of siltation and the efficient operation of the irrigation area in the future.

In order to further analyze the permeability characteristics of cohesionless soil containing carbonate sand, South China Sea carbonate sand and fine grain quartz powder were used as test materials to prepare test soil samples. The GDS high-pressure triaxial apparatus test system and constant head permeameter were used to carry out research on the influence of carbonate sand content, initial void ratio and effective stress on the permeability characteristics of cohesionless soil. And then an empirical model of permeability coefficient considering effective stress was established. The test results show that when the content of carbonate sand is less than 40%, the grain structure is cohesionless soil matrix, and the pore structure is determined by fine grained soil; The structure of carbonate sand sample is the skeleton structure of sand particles, and the magnitude of permeability coefficient increases significantly; With the increase of effective stress, the permeability coefficient of the sample decreases significantly. An empirical model for the permeability coefficient of cohesionless soil with carbonate sand was established. The model parameters were closely related to the properties of the soil sample. The calculated values were in good agreement with the test values. The research results can provide reference for practical projects.

Aiming at the collapse and failure of high dangerous rock in Zhaojiaya, Xingshan County, numerical simulation methods were used to simulate the stability, evolution law and movement characteristics of the regional dangerous rock mass, so as to obtain the movement track, bounce height and impact energy of the collapsed rock. The results show that the Zhaojiaya dangerous rock has good stability under natural conditions. Under continuous rainfall or rainstorm, the fissure water gradually permeates, and there is the possibility of collapse and failure of the main control structural plane. After the collapse and destruction of the dangerous rock, most of the fallen rock will stay on the slope, and a few of the fallen rock will stop on the road at the foot of the slope after the collision and rebound. Combined with the actual situation of the site and RocFall simulation, the governance measures of "danger clearing + slope leveling + passive protection net" were proposed. The research results can provide reference for similar disaster control projects of high dangerous rock collapse.

In order to study the temporal and spatial evolution characteristics of internal dynamic response and energy transfer of fresh concrete under the action of surface vibration load, a laboratory vibratory plate compaction test of fresh concrete was carried out. Real-time dynamic response characteristic parameters were obtained by acceleration sensors at different buried depths in the compaction process of vibrated concrete. The vibration signal was denoised by wavelet threshold denoising method. The temporal and spatial evolution law of internal motion energy of fresh concrete was analyzed by measuring point acceleration response. The results show that the aggregate particles near the surface vibration source mainly move vertically, and the surface of fresh concrete is obviously settled on the macro scale. With the increase of burial depth, the internal particles at the far end cannot get enough vibration energy, so it is difficult to overcome the extrusion force between particles and the friction resistance in the medium and maintain the initial equilibrium state, which is less affected by vibration. The vertical acceleration of internal particles is greater than the lateral acceleration during the vibration compaction of fresh concrete. With the increase of the compaction degree of fresh concrete, the vertical acceleration amplitude first decreases and then basically remains unchanged, while the lateral acceleration amplitude first decreases and then slightly increases. The vibration energy attenuation of concrete near the vibration source is the largest, but it is not significant with the increase of buried depth. The work in this paper can provide reference for the theoretical construction and in-depth study of vibration compaction of fresh concrete.

In order to accurately describe the water environment quality of Shiyang River Basin and clarify the main pollution factors of water quality, according to the analysis results of water quality data of typical sections of Shiyang River Basin in Gansu Province, five pollution factors including dissolved oxygen, chemical oxygen demand, ammonia nitrogen, total phosphorus and fluoride were selected as water quality evaluation indexes. A combined weighting comprehensive evaluation model based on CM-AHP and entropy weight method was established to study the main pollution factors of Shiyang River Basin. The results show that the combined weight of total phosphorus and ammonia nitrogen pollution accounted for the largest proportion, reached 0.438 and 0.296, respectively, which were the main pollution factors of Shiyang River. The water quality of Shiyang River Basin gradually deteriorated from the upstream to the middle and lower reaches.

Columns are commonly used in water conservancy project to support the upper structure. In order to ensure the stability of the upper structure, it is necessary to monitor the deformation of the column to ensure that the inclination angle of the column is within the allowable range. The non-contact measurement and high-precision point cloud data acquisition was carried out by the total station scanner used waveform digital ranging technology. During the acquisition process, the three-dimensional coordinates of each observation station were calculated by the rear intersection method, and the observation data was unified into a coordinate system. Data registration avoided the transmission of observation errors. This paper proposed a method for calculating the tilt deformation of the column using the point cloud. After collecting the two phases of the point cloud data, the deformation was calculated based on the true pair of points, and the point and surface optimization algorithm was used to reduce the error, and the tilt angle of the column was calculated. Finally, a simulation test of the tilted deformation of the column was designed to verify the accuracy of the deformation calculation method. The test results show that the actual inclination angle is 0°16'49", the calculated inclination angle is 0°16'57", the algorithm error is less than 20', which meets the requirement of deformation monitoring in high-rise structure. Therefore, the deformation calculation method can be applied to the field of column tilt deformation monitoring.

Aiming at the problems of high economic cost and difficult construction of the anti-seepage scheme designed for the dam site area of the concrete face dam of the lower reservoir of a pumped storage power station, a three-dimensional finite element model was established according to the actual engineering situation of the lower reservoir site. Firstly, the distribution of seepage field and the factors such as seepage gradient and seepage flow in each part of the reservoir area under the design anti-seepage scheme were calculated. Then the effects of different curtain depth and the change of curtain length of left and right dam abutment on seepage gradient and seepage flow were analyzed. Finally, the optimization suggestions for the design anti-seepage scheme were put forward. The results show that the curtain depth of the dam site area can be shortened to 3 Lu line, and the curtain length of the dam abutment on the left and right banks can be shortened by about 10 m. Therefore, the project cost can be reduced and the construction progress can be accelerated on the basis that the key parts of the dam site area can meet the seepage stability and the total seepage flow can be effectively controlled.

In order to solve the problem of interval flow inversion of cascade hydropower stations, taking the cascade hydropower stations in the middle and lower reaches of the Dadu River basin as an example, the characteristic curve correction of the six reservoirs in the basin was carried out. In order to accurately calculate the inflow and outflow of each reservoir by correcting each characteristic curve, and make the flow inversion rate of each interval meet the requirements, four correction methods of characteristic curve correction methods were proposed with the goal of minimizing the flow inversion rate, which includes single-point discrete optimization, multi-point discrete optimization, curve cluster overall translation optimization, and distinguishing different water head/water level translation optimization. The simulation calculation shows that although each curve correction method has certain effect, the distinguishing different water head/water level translation optimization method has the best effect. After using this method to correct the characteristic curve, the interval flow inversion rates of PuSheng and GongTong decreased from 53% and 77.96% to 13.93% and 4.37%, respectively. Although the flow inversion rates in the remaining intervals has slightly increased after correction, they are all within a reasonable range. It can be seen that the curve correction method effectively reduces the inversion rate of interval flow and improves the consistency of runoff series, which can provide a data basis for the accurate water regulation of cascade hydropower stations in the Dadu River basin.