bluuebunny/crossref_metadata_2025_split huggingface dataset:
Quantitative analysis of diaphragm plate caused by pedestal void of assembled box girder
Authors: Wu Xiaoguang , Liu Jiaxin , Fang Miaomaio , Sun Fan , Yan Feng 
Published: August 2021

Abstract
In this paper, ANSYS finite element software is used to study the influence of pedestal void on the diaphragm force of prestressed prefabricated box girder bridge. Three different working conditions of no support void, side span support void and middle span support void were simulated respectively, and then the principal tensile stress and vertical deflection of each diaphragm key point were studied under different working conditions. The results show that the support void has almost no effect on the main tensile stress and vertical deformation of the diaphragm in the mid-span, but has a significant effect on the diaphragm at the end of the beam. The influence of the middle span support void on the main tensile stress of the diaphragm is larger than the opposite span support void. The effect of side-span bearing void on the vertical deflection of diaphragm is greater than that of mid-span bearing void. The void of the support will lead to the uneven force of the whole structure and finally affect the stability of the whole structure.
Stability Analysis of Prefabricated Steel Structure Building Based on Pushover Method
Authors: Chen Jihuan , Yang Zhiwei , Xu Shuang 
Published: August 2021

Abstract
Prefabricated steel structure building is a kind of structural system which is widely used in recent years. It is very necessary to study the stability of it by Pushover method. Through the investigation of a building under construction in Hebei Province, China, the finite element analysis software SAP2000 is used to establish numerical simulation models of four kinds of staggered truss steel structure, so as to calculate its static pushover performance. It includes base shear-peak displacement curves, performance points and plastic hinge development. The main conclusions are as follows: the terminal shear and displacement of the hybrid staggered truss structure are obviously better than that of the Vierendeel staggered truss structure in the process of pushover. The base shear of the structure can be greatly increased and the overall deformation of the frame can be reduced when the side spans is set up. Until the end of the pushover, there is no plastic hinge on the column, which meets the seismic design requirements of “strong column and weak beam”, indicating that the prefabricated steel structure staggered truss system has good seismic performance.
Research on runoff variation trend and hydrological situation variation in Wujiang River Basin
Authors: Wei Guo , Jun Shao , Yangshuo Ou , Liqiang Yao , Guangdong Wu , Ning Cui Fu , Kun Wang 
Published: August 2021

Abstract
This paper selected the Wujiang River Basin as the study area, and restored the runoff process at Wulong station through complicated calculation. By using Mann-Kendall, Kendall rank correlation test and other test methods, there was no significant trend for the runoff in the Wujiang River Basin. The RVA method was applied to analyze the influence degree for the existing cascade reservoir operation on the hydrological regime of the Wujiang River, and it was concluded that the overall hydrologic indicators alteration degree of Wulong Station was high. By simulating the operation scenarios of the cascade reservoirs, future hydrological regime alteration of Wulong station was predicted. Compared with the current situation of Wulong station, the results showed that the inflow will decrease in flood season, and the inflow will increase in dry season.
Influence of mixed free-surface and pressurized flow on transients process in a tailrace tunnel of a tailrace surge chamber
Authors: Gaohui Li , tianchi Zhou , Fei Yang , Yimin Chen , wangjia Danzhen 
Published: August 2021

Abstract
In the calculation of hydraulic transients in a hydropower station, the hydraulic problems caused by free-surface and pressurized flow are relatively complex. In consideration of this phenomenon, numerical simulation is used in this paper to study the effect of the transient free-surface, pressurized flow in a tailrace tunnel on the minimum pressure at inlet of the draft tube and the lining segment of the tailrace tunnel and the effect on the primary frequency regulation of the unit. The results show that the existence of tailrace surge tank can reduce the disturbance of the mixture flow on the units. Meanwhile, free-surface and pressurized flow can speed up the attenuation of the surge in the surge tank. Reasonable arrangement can mitigate transients in the tailrace system, which may provide a reference for similar projects.
Research on flood forecast of dashimen reservoir in xinjiang based on melting snow and runoff yield under excess infiltration
Authors: Liu Yi , Zhang Fenglong , Wu Haiyan , Li Yongfeng , Jiang Zhiqiang , Li Qingqing , Wang Yan , Yi Tailai 
Published: August 2021

Abstract
In China, the distribution of water resources is uneven in time and space. The effective allocation of water resources can realize the rational utilization of water resources. Reservoirs are an important part of the basin system, and the rational operation of reservoirs can realize the optimal allocation of water resources. Flood forecast is of great significance for reservoir operation. In order to realize the optimal operation of Dashimen reservoir in Xinjiang, aiming at the flood forecast in the dry area affected by melting snow, this paper expanded and improved the traditional hydrological forecast model, built the flood forecast model in the dry area with the coupling snowmelt based on the northern Shaanxi model and Elman neural network, and using the typical rainfall and runoff data in this area The results show that the relative error of the model is less than 10% and the accuracy is high, which can be used in the actual forecast. This model realizes the flood forecast in the drought area affected by snowmelt, and provides a new idea for the flood forecast of reservoir in the drought area affected by snowmelt, which has a certain guiding significance for the flood forecast in the drought area.
Analysis and Research on the Influencing Factors of Sediment Discharge of Wanjiazhai Reservoir in 2018
Authors: Zhihui Ren , Ting Wang , Shaojun Qu , Zilu Wang , Huaibao Ma 
Published: August 2021

Abstract
Sediment discharge method has great impact on the service life and comprehensive benefits of the reservoirs in sediment-laden river. In this paper, the actual operation process of Wanjiazhai Reservoir in 2018 was taken as the research object to analyze changes in runoff and sediment process and erosion and deposition in the reservoir area, and to explore possible influencing factors for reservoir sediment discharge. According to the results, the erosion in the reservoir area of Wanjiazhai Reservoir in 2018 was 112.6 million t, the erosion period was concentrated in August and September, and the erosion positions were concentrated at the elevation of 935-966 m; the deposition morphology in the reservoir area changed obviously after twice sediment flushing in 2018, and the channel has been subject to deepening and widening accompanied by reservoir bank collapse; there is a negative correlation between the outflow sediment concentration/sediment discharge ratio of the reservoir and the reservoir water level.
Experimental and simulation studies on the attenuation coefficients of organic pollutants in “Han River and Three Tributaries” basin, China
Authors: Zheng Jing , Hao Chen , Huiqun Cao , Jian Tang , Rui Li 
Published: August 2021

Abstract
In order to study the attenuation mechanism and spatial and temporal evolution of organic pollutants in “Han River and Three Tributaries” basin, laboratory experiments were conducted, and a novel COD attenuation coefficient model was proposed. The main environmental factors affecting COD attenuation were identified. On this basis, the attenuation term of the one-dimensional water quality model is modified, and the spatial and temporal distribution characteristics of COD in Hanbei River are simulated and analyzed using the modified water quality model. The results show that: (1) the attenuation process of COD in Hanbei River is basically in accordance with the first-order reaction kinetics, and biodegradation accounts for a large proportion of the whole attenuation process. Within a certain range, the increase of flow velocity, water temperature and sand content promoted COD attenuation, and the effect of sediment particle size on COD attenuation in Hanbei River was not obvious; (2) based on the experimental results, a model for calculating the attenuation coefficient of pollutants is derived. A time varying attenuation coefficient can be calculated, which can realistically reflect the attenuation process and the distribution pattern along the river under the changing environment; (3) Model simulations determined that the COD attenuation coefficient of Hanbei River ranged from 0.03 to 0.19. The research results of this paper provide a scientific and theoretical method to accurately determine the attenuation coefficient of pollutants. It also provides scientific support for determining the ecological water demand of typical rivers and lakes similar to “Han River and Three Tributaries” and the scale of water diversion for Interconnected River System Network.
Research on the progress of urban lake water environment assessment
Authors: Xiaoyu Cui , Pengfei Zhang , Wenqi Peng , Huihuang Luo , yunxia Gao , Jinyong Zhao 
Published: August 2021

Abstract
Urban lake water environment management and water ecosystem restoration have always been research hotspots in China and abroad. However, there have always been different opinions on the water environment situation, water environment evaluation and subsequent water environment regulation of urban lakes worldwide. Based on the investigation of water environment in China and abroad, this research summarizes the main water quality evaluation methods of urban lakes, and systematically analyzes and organizes the main evaluation methods, in order to provide references for the future evaluation and restoration of urban lakes.
Preliminary Study on Ecological Water Conservancy Strategy to Cope with Climate Challenge
Authors: Xie Zundang , Lv Xiaolong , Chen Xingliang 
Published: August 2021

Abstract
Global warming has caused sea level rise, extreme meteorological events, flood and drought disasters. From the perspective of ecological civilization construction, taking China as a typical example, this paper explored how to deal with the adverse impact of climate change on human and ecosystem through the development of ecological water conservancy. The main measures were as follows: firstly, construct the national water network connecting the natural water systems in the South and North of China, play the role of the Yellow River as a link to ecologically replenish water in arid and semi-arid areas; secondly, recover the over exploited groundwater in North and Northeast China and the ancient lakes in Northwest China. By storing a large amount of water on land, the goal that slowing down the speed of the sea level rise, reducing the flood damage in the south and coastal areas, repairing and improving the ecological environment in the north and northwest regions of China and spurring the local economic development could be achieved.
Development of SOA-Based Hydrological Data Compilation Management System
Authors: Yang Yu , Dazhong Xia , Zheng Jin 
Published: August 2021

Abstract
As the results of hydrological data compilation are important fundamental information resources in China, how to efficiently manage them and provide data support for water science research is a major problem that needs to be addressed at present. In this paper, a hydrological database of Haihe River Basin was preliminarily established based on the compilation of the complete electronic data files, and a SOA-based management system of hydrological data compilation results was developed, featuring functions related to the compilation results. The research shows that the system boasts strong practicability and operability, and will be popularized in the later period, in order to improve the capacity and level of hydrological service, support water conservancy information and drive the modernization of hydrological service.
Analysis about the impacts of changing basin underlying surface on design floods for design units of water diversion projects
Authors: Minglei Ren , Xiaodi Fu , Liuqian Ding , Gang Wang , Guangyuan Kan , Liping Zhao , YaFeng Zhu 
Published: August 2021

Abstract
After the water diversion project has been put into operation for many years, due to the long distance, complex hydro-meteorological conditions, and rapid development of social economy, the underlying surface conditions of corresponding natural basins in the design units of water diversion project have changed to some extent compared with the beginning of the project design, especially the underlying surface situation of rivers in the northern region has changed greatly. Based on ArcGIS to extract basin characteristic values of the design unit of water diversion project, such as basin area, river length and slope, this paper analyzes the changes of current basin characteristic values of design unit compared with the design period. For the design unit with significant changes in the basin characteristics, the original design flood calculation method is used to calculate the flood of the same design rainstorm under current conditions, and the impacts of changing basin underlying surface on design floods are analyzed.

PACS: J0101
Study on preparation and strength of high-strength micro-expansive lightweight aggregate concrete
Authors: Huiqin Yao , dongmei Liu 
Published: August 2021

Abstract
Orthogonal design was used to research the effect of water cement ratio and the content of expansive agent and fiber on the compressive strength, bending strength and splitting strength of high-strength micro-expansive lightweight aggregate concrete. The optimum mixing proportion of lightweight concrete considering different strength target was determined through the integrated balance method. Results indicated that, the splitting strength and bending strength was about 0.04 times and 0.08∼0.12 times as big as the compressive strength when the intensity grade of lightweight concrete was LC45 or LC50. The content of ZY expansive agent has a notable influence on compressive strength, and has certain influence on bending strength. The water cement ratio and polypropylene fiber content have no significant effect on different strength target. The optimum mixing proportion for high-strength micro-expansive lightweight aggregate concrete was that, the content of ZY expansive agent and polypropylene fiber were respectively 8% and 0.1%, and water cement ratio was 0.30. The strength grade of LC50 for the optimum mixing proportion has been achieved.
Research on Treatment Technology of High Ammonia Nitrogen Wastewater from Shale Refinery
Authors: Yuting Fu , Changbo Li , Guozheng Zhao , Dongyu Li , Zikai Sun , Jiatong Yang 
Published: August 2021

Abstract
This article describes the nature and hazards of shale refining high ammonia nitrogen wastewater, and summarizes the characteristics of various treatment technologies for shale refining high ammonia nitrogen wastewater. Methods for treating ammonia-containing nitrogen include chemical precipitation and the like. This article reviews the research status and development trend of shale refining high-ammonia wastewater treatment technology.
Design of remote operation and maintenance platform of substation DC system for field defect handling
Authors: Li Wenwei , Wang Xiaoming , Shi Jun 
Published: August 2021

Abstract
The current remote operation and maintenance platform of substation DC system mainly relies on manual use of each independent monitoring device to collect and transmit data for remote operation and maintenance management, which is difficult to realize intelligent operation of substation and also leads to slow response and poor processing performance of operation and maintenance platform. In order to optimize the above-mentioned problems, the remote operation and maintenance platform of substation DC system for on-site defect processing is studied and designed. Based on the framework of the operation and maintenance platform, a combination of balanced and unbalanced bridge-based principle is used to monitor the DC insulation status. The JSON protocol is used to realize the data interaction between the operation and maintenance platform and the management terminals, and to design the DC system defect processing scheme. The Floyd shortest path algorithm is used to plan the operation and maintenance inspection strategy of the platform to achieve fast operation and maintenance of the DC system. The platform performance test results show that the performance index of the designed operation and maintenance platform is significantly improved, and the average request response time is shortened by 28.1%, and the operation and maintenance management effect is better.
Design and implementation of a simulation optimization method for high arch dams
Authors: Li Guo , Wu Jianming , Tan Yaosheng , Liu Chunfeng , Pei Lei , Song Liangfeng , Yu Hu 
Published: August 2021

Abstract
The construction scale of high arch dams is large and the overall structure is complex. Numerical simulation results obtained only by quoting standard parameters or laboratory measurements are quite different from actual engineering conditions. Based on a set of temperature-stress coupling simulation system, the key thermodynamic parameters used in the simulation calculation are further optimized through monitoring data and experimental results, so as to be close to the actual engineering state and better for studying the working status of high arch dams. Combined with actual applications, it is shown that the optimized results of the method are consistent with the actual objective laws, can better reflect the real situation, reduce the “noise” interference in the data, and verify the correctness and feasibility of the method.
Concrete life prediction model based on freeze-thaw damage theory and its application
Authors: Yang Dongpeng , Guo Weimin , Wang Baomin 
Published: August 2021

Abstract
For hydraulic concrete structure in cold and severe cold areas in northern China, its frost resistance directly restricts the life and safe and stable operation of the project. In this paper. Based on the freeze-thaw damage theory, this paper optimizes and improves the Weibull distribution model, and uses the 1:1:4 standard frost-resistant specimen of hydraulic concrete as the physical model to obtain a freeze-thaw damage model that is more in line with the standard specimens of the rapid freeze-thaw experiment. Based on this model, a concrete life prediction method is proposed. In order to solve the problem that the initial damage of coring concrete is not clear, an iterative approximation method is proposed. The life prediction method proposed was verified through actual engineering cases. The results show that the model can better describe the process of concrete freeze-thaw damage and destruction, and the life prediction results are more reliable.
Numerical Simulation of Connected Flow in the Inlet and Outlet of the Pumping Storage Power Station
Authors: Li Gaohui , Wu Xumin , Yao Minjie , Liu Ning , wangjia DanZhen , Cui WeiJie 
Published: August 2021

Abstract
Pumping and storage power stations with different hydraulic units are simultaneously in power generation and pumping operation (same-in-one pumping operation) is an effective means to alleviate the adverse effects caused by the sudden power imbalance of the power grid and adapt to the emergency dispatching requirements of the power grid. In this mode of operation, the water flow in the different inlet and outlet ports is reversed, and water flow communication will be formed in the front pool. Aiming at the problem that the connected flow is difficult to measure in physical model test and prototype observation, a three-dimensional flow field numerical simulation is used to determine the flow connection path and orifice velocity distribution, and the area-weighted average method is used to obtain the connected flow calculation method for different paths. Taking the inlet and outlet of a pumped storage power station as an example, this method is used to analyze the flow rate of the orifice and its proportion. The results show that when the pumped storage power station is running in the same pumping operation, the flow rate of some orifices will exceed 80% of its total flow. It is easy to cause the cooling water of the unit to circulate between the hydraulic units and keep heating up, thus reducing the cooling effect of the unit.
Finite element analysis of stress in the gallery of gravity dam on inclined bedrock based on ANSYS model
Authors: Gao Shang , Chen Yan , Xiang Junhong 
Published: August 2021

Abstract
Taking a variety of galleries in a concrete gravity dam body as the research object, it analyzes the changing law of stress concentration phenomenon around the galleries in the dam body affected by the holes of the galleries. Use the large-scale finite element application software ANSYS to model the dam and the bedrock within a limited range, change the position of the gallery to obtain different solid models, and obtain the stress distribution map around the gallery after loading calculations. The results show that when the distance between the gallery and the upstream dam surface changes from 3.0 to 9.0m, the maximum principal stress of the gallery section gradually decreases and tends to remain unchanged; there is obvious stress concentration at the gallery and the dam heel. When the drainage gallery is arranged in the vertical direction, the change of the distance affects the stress distribution and state of the gallery. When the distance is changed from 15 to 25m, the stress changes from 0.106e7 to 0.088e7Pa, and tends to be stable, and the mutual influence gradually decreases. This provides guidance and suggestions for the design of the gravity dam gallery on the inclined bedrock.
Analysis on Evolution Characteristics of Hydrometeors in South China Based on Lagrange Tracking Method
Authors: Song Wenting , Li Yunying , Ye Chengzhi 
Published: August 2021

Abstract
To reveal the microphysical process of clouds inside a rain cluster and identify the causes of changes in water resources in the air in South China, rain cluster areas with the radar reflectivity factor higher than 40dBZ in a heavy precipitation process in South China were defined as convective cloud cores, and areas with the factor greater than 20dBZ and less than 40dBZ as stratiform clouds around cores with Lagrange tracking method based on S-band dual-polarization radar data. An analysis was conducted on the evolution law of the types of hydrometeor particles and variation characteristics of the raindrop size spectrum in the two areas as well as their differences. The results showed that convective cloud cores and surrounding stratiform clouds were composed of large and sparse raindrops at the early stage of development; the particle crushing process mainly occurred inside stratiform clouds at the mature stage, and the collision-coalescence process mainly occurred at the attenuation stage. Stratiform clouds showed a process of increase in the density of graupel particles at the stage of precipitation enhancement, but the density of graupel particles in convective cores did not change significantly; high- and low-density graupel particles in convective cores had a higher frequency of occurrence than those in stratiform clouds.