Aiming at the problems such as unstable design quality, long design cycle and large repetitive workload in the current gate design, based on the whole process three-dimensional parametric design concept, and according to the design specifications and manuals, a three-dimensional parametric design method for the whole process of gate is proposed, that is, the three-dimensional parametric geometric modeling, spatial structural analysis and engineering drawing of plane gate structure are realized on the same platform by writing corresponding programs. This method can make the gate structure transition from plane design to space design, make the design process more intuitive, improve the quality and efficiency of the design, reduce the repetitive workload caused by design changes in design process.

To analyze the potential influence of the construction and operation of the cascade junction on the hydrologic regime of four major Chinese carps spawning sites in the downstream of the Xinjiang River, 21 parameters were selected to establish the hydrological index system of fish spawning sites. The one-dimensional hydrodynamic model was adopted to analyze the hydrological regime of Daxidu spawning site before and after the construction of the cascade junction. The range of variability approach was used to analyze the hydrological changes of spawning grounds during the breeding period before and after the construction of cascade junction. The results show that the flow during the breeding period decreases after the operation of the cascading junction, which made the variation range of water flow limited in a small range. Furthermore, the number of high flow pulse decreased, which reduced the stimulation signal to spawning of four large fishes. This study quantified the impact of the construction of cascade junction in the downstream of the Xinjiang River on the spawning grounds during the breeding period, and provided scientific guidance for the design of the local hub operation scheme.

Integrating reclaimed water into water supply system is a strategic measure to alleviate the problem of water resource shortage. Aiming at the uncertainty and stability existing in the optimal allocation of multiple water sources including reclaimed water, Monte Carlo simulation and interval two-stage robust stochastic optimization were coupled to build the optimal allocation model of multiple water sources under the condition of multiple uncertainties. The uncertainty represented by the form of interval and probability distribution in the process of water supply and water demand was effectively handled. The variable random value of water resources allocation and the recourse cost were balanced, and the system’s risk was controlled. The water resources allocation schemes were obtained under different scenarios. The improved model was applied to water supply area in Linfen Basin-Jincheng Qindan river watershed of Shanxi large water network. Based on the comprehensive analysis of regional water efficiency and water loss under different scenarios, the joint allocation scheme of multiple water sources under different utilization rates of reclaimed water was obtained, which provides a reference for decision makers to consider the optimal allocation scheme of reclaimed water under uncertain conditions.

During the landfall of Typhoon Billis in July 2006, Wujiang River, a tributary of the Beijiang River basin, was hit by an unusual rainstorm in history, resulting in the largest flood ever recorded in the basin. Based on precipitation record and Doppler weather radar data, it is found that the "train effect" induced by a convective storm, which originated in southern Hunan and crossed the divide, is the main reason for the extreme precipitation in Wujiang River basin. The study of the convective storm activity by using GIS technology shows that the complex topography of Wujiang River basin changed the direction of the convective storm several times, which greatly prolongs the duration of the storm in Lechang city, resulting in local rainstorm and flash flood. The study also found that the Huangcen Reservoir in Qitianling Mountain area was affected by typhoon, which probably enhanced local convections. The study reveals the influence of mesoscale and miso-scale topography on typhoon rainstorm, which contribute to the prevention of typhoon-induced disasters.

The risk assessment of collapse of tunnel involves many fuzzy factors and the evaluation method is complex, which makes the evaluation system constitute a gray system and the applicability of the evaluation method is not high. It is difficult to accurately assess the risk level of tunnel landslides. Using the basic idea of gray system and vector projection principle, a set of tunnel collapse risk evaluation model based on gray vector projection method is proposed. Based on the comprehensive analysis of the influencing factors of tunnel collapse under complex stratigraphic conditions, the group analytic hierarchy process (GAHP), which takes into account the degree of difference in the views of decision makers, is used to reduce the dimensionality of the pre-selected evaluation index system. Then, according to the comprehensive decision weight coefficient, 13 preferred evaluation indicators that can fully reflect the different, representative and highly differentiated evaluation indicators of the collapse mechanism are selected to establish a tunnel collapse risk optimal evaluation index system. In addition, grey group clustering (GGC) and anti-entropy weight (AEW) are introduced to determine subjective and objective single-level sorting weights, respectively. The improved combination weighting method of game theory (ICWGT) is used to obtain the optimal comprehensive weight distribution coefficient to determine the total ranking weight of the indicator. Finally, according to this model, the risk of collapse of five groups of tunnels was evaluated by the model. The results show that the risk assessment level of tunnel collapse is highly consistent with the actual excavation. The reliability and accuracy of the model are verified.

When upstream and downstream water regime changed in long-distance pressurized water delivery pipeline of cascade pump stations, it is easy to cause the change of water pressure in pipeline and hydraulic parameters such as flow velocity, and results in water hammer. In order to meet the water delivery requirements of the pipeline and ensure its safe operation under various working conditions, one-dimensional characteristics method and 3D VOF coupled methods were used to simulate. The mathematical model for transient process analysis of long-distance water delivery system of cascade pump stations was established to analyze the change and law of pipeline internal pressure and water level in outlet pool during long-distance water delivery system in Chuhe Level Ⅳ station of Simashan River Diversion Project under working conditions, such as suspending period and power losing period. It also shows that the safety of the entire pipeline system can be better guaranteed though the reasonable open-close laws of the terminal gate and side gate.

To maximize the cost-effectiveness of green infrastructure (GI) implementation, a pilot project in Guangzhou Tianhe Smart City was selected to conduct the study. Setting runoff volume reduction rate, suspended solids load reduction rate, and life cycle cost of GI as optimization objectives, SPEA2 was coupled with SWMM to obtain a series of GI optimal spatial allocation schemes with land utilization as the constraint condition. The results show that with the increase of the rainfall recurrence period, the integrated reduction rate and the range of the GI optimal spatial allocation scheme set gradually reduce. The sunken lawn (SL) is the most cost-effective GI while the green roof (GR) is the least. When the investment is low, the area of SL can be planned to the maximum before planning other GI. If the integrated reduction rate is high with sufficient funds, GR can be considered based on the large allocation area of other GI. The results can provide theoretical support for the implementation of the sponge city program.

In order to improve the safety management level of sluice project construction and the traditional manual management mode, this paper proposed the automatic identification process of large-scale sluice project construction hazards based on the database and BIM technology. For solving the low efficiency of construction safety management, database and BIM technology were used to store the large-scale sluice project construction hazards sources. A identification system of large-scale sluice project construction hazard was developed by using computer Technology, which improves the efficiency of sluice project construction safety management and provides reference for information management of construction hazard sources.

Aiming at the evaluation of water resources security in China, combined with the characteristics that support vector machine (SVM) has good classification effect on small samples and nonlinear problems, the sparrow search algorithm (SSA) was used to optimize the penalty factor (C) and kernel function parameters (g) of the SVM. The support vector machine model optimized by the sparrow search algorithm (SSA-SVM) was used for regional water resources security assessment. A case study was carried out in a certain area of Luoyang City. The results show that the evaluation grade obtained by SSA-SVM method and T-S fuzzy neural network method are basically consistent, the SSA-SVM model has the characteristics of fast searching speed, and not easy to fall into local optimum, which can be used for regional water resources security evaluation.

Due to the lack of measured temperature on the channel surface, it is difficult to accurately simulate the channel temperature field. Considering the effect of solar thermal radiation on the temperature of the shady slope, sunny slope and bottom slab of the channel, a calculation model of channel surface temperature increase was established. The finite element software ABAQUS was used to simulate the temperature field change process of the channel and analyze the frost heave of the channel lining under the condition of three times of cooling. The results show that under the influence of solar thermal radiation, the freezing depth of the shady slope of the channel is significantly greater than that of the sunny slope and the bottom slab, the calculated freezing depth and the damage law of the lining are also in good agreement with the actual situation. During the cooling process, the concrete lining of the shady slope is more prone to frost damage than that of the sunny slope and the bottom slab, the same rule applies when calculated according to the multi-year maximum freeze depth utilization specification. The research results can provide new ideas for the temperature control and crack prevention design of channel concrete lining.