bluuebunny/crossref_metadata_2025_split huggingface dataset:
Study on safety monitoring model of crack opening displacement for high-pile wharf
Authors: Chen X D , Li J J , Huo Z Y 
Published: November 2019

Abstract
Safety monitoring is an important measure for the safe operation of water conservancy projects. The monitoring model plays an important role in monitoring data analysis, widely used in reservoirs and dams. However, relevant theories and studies are rarely applied in port terminals. Since high-pile wharves are different from reservoirs or dams in working environment and working behaviour, it is necessary to develop a monitoring model for high-pile wharves considering the working characteristics. In this paper, it was proposed that principal effect factors of crack opening displacement of high-pile wharves were temperature component, wind component, heap load component, and time effect, according to the change law of dependent and independent variables. The expressions of these factors were given. On the basis of it, the statistical model and Least Squares Support Vector Machine (LS-SVM) model of crack opening displacement (COD) was established respectively. The evaluation method for these models was developed. Models were used in fitting and prediction with data series of COD of a high-pile wharf to verify the effectiveness and reasonableness. The results showed that the proposed models with high precision and certain prediction ability can provide scientific principles for data analysis and safety monitoring of high-pile wharves.
The simulation of water quality in Chanba Ecological District
Authors: Chen J , Wu C , Bao Z M , Gong Y , Wang Y 
Published: November 2019

Abstract
In order to investigate the characteristic of migration and transformation of various pollutants in rivers, the river in Chanba Ecological District was selected as the research object. The MIKE21 FM model coupled with Ecolab module was employed to establish the twodimensional water quality model to simulate the distribution characteristic of different water quality parameters, which were Total Nitrogen (TN), Total Phosphorus (TP), Ammonium Nitrogen (NH3-N), Chemical Oxygen Demand (COD), Chlorophyll a (Chla), and Dissolved Oxygen (DO) separately. The results demonstrated that the concentration values of TP, NH3-N, and COD in Chanhe River were greater than them in Bahe River before the water flowed into the junction zone. The TN concentration value in the calculation zone except the region which held poor hydraulic conditions exceeded the standard of Grade V (GB3838-2002). Because the water in Bahe River was disturbed by water in Chanhe River and point sources in Bahe River, COD and NH3-N concentration values increased clearly after the water passed from the NO.4 Dam in Bahe River.
Transformation of nitrogenous compounds in the water-sediment-microbiological system from the Yangtze River
Authors: Lu G H , Xu H P , Pan T 
Published: November 2019

Abstract
The water-sediment-microbiological system was constructed by flow-through technique in the laboratory using the undisturbed sediment cores collected from Nanjing section of Yangtze River to determine nitrification, denitrification and anaerobic ammonium oxidation (anammox) processes of nitrogenous compounds. The nitrification rates ranged from 11.95 to 19.29 μmol N m−2 h−1 in the sediments and the rates of denitrification and anammox ranged from 11.98 to 65.86 μmol N m−2 h−1 and 0.40 to 8.04 μmol N m−2 h−1, respectively. Denitrification dominated nitrogen removal process, especially non-coupling nitrification process. The decrease of total organic carbon (TOC) and electrical conductivity (EC) in sediments increased the activity of ammonia monooxygenase and promoted the rate of nitrification. The denitrification rates were related to NO3
−-N concentrations in the overlying water, and TOC, pH and EC affected the activity of the nitrate reductase. The increase of TOC and clay content and the decrease of EC corresponded to the increase of nitrate reductase activity and anaerobic ammonia oxidation rate. The optimum temperature was 35°C for denitrification and 25°C for nitrification. The pH values influenced nitrogen conversion, denitrification occurred more easily in neutral environment, and the nitrogen conversion rates in the light were higher than in the dark.
Research on the transport and dispersion of Asian carp eggs in the “man-made flood pulse” in the middle Yangtze River by Reynolds-averaged numerical simulation
Authors: Yang Q H , Zhou J Y , Zhang L , Wang J S 
Published: November 2019

Abstract
Eggs and early larvae of fishes is important to the early life stages of fish, it is closely related to the fish hatching and resource supplementation, the fish egg movement is essential to studied for re-operation ecological-flow determination, re-operation effect evaluation and fish spawning ground repair. In this paper, fish eggs of Four major Chinese carps were used as the object of study, and the fish eggs were generalized to sediment-like particles. Assuming that their diameter was constant and other mechanical properties were given, the analytic solution considering the change of lateral velocity along the curve were proposed, and the improved three- dimensional hydrodynamic model was used to simulate the distribution characteristics of the fish eggs of the sediment - like particles in the curved channel. (1) cross-section: In straight river section, cross-section of eggs distribution is more uniform in vertical direction, the middle concentration is slightly larger than the two sides in horizontal direction; in the bent river, from the convex bank to the depression concentration gradually reduced. (2) Longitudinal section: the overall concentration of eggs showed a decreasing trend along the trend, the bank near the shore, the egg concentration is increase in a certain time and region, affected by the flow field conditions. The research results can provide the basis for the egg movement simulation by the sink channel and the law of its movement.
The evolution characteristics and dynamic mechanism of the mouth reach in the Yellow River Estuary
Authors: Ji Z W , Zhao X , Lu Q , Wang D W 
Published: November 2019

Abstract
The Yellow River Estuary is a depositional microtidal estuary which is dominated by dynamic runoff. In the present study, based on actual measured hydrological data and remote sensing images, the evolution characteristics of the sand spit, gully, branch channels, and mouth bar of the Yellow River Estuary were analysed. It was determined that prior to 1998, the incoming flow and sediment had been large, and the deposition and extension speed of the sand spit had been relatively fast, with the mouth bar becoming highly developed. However, after 1998, the incoming flow and sediment entering the Yellow River Estuary had become significantly decreased. It was observed that erosion had occurred in the sand spit, and the mouth bar had become shrunken. Currently, there are many types of gullies and branch channels in the mouth reach area, including main channels, branch channels, flood gullies, and tidal gullies which can be transformed into each other. By establishing the relationship between the incoming sediment and the epeirogenic area, it was found that the incoming sediment level from the Yellow River Estuary of 300 million tons was the equilibrium point of the sand spit deposition and erosion, and there was an approximate linear relationship observed. The evolution characteristics of the mouth reach included two categories: persistent influencing factors and accidental influencing factors. Among those, the incoming flow and sediment were determined to be the main continuous dynamic actions, and storm surges, channel oscillations, and water-sediment regulations were considered to be accidental factors. Although the time period was short, the impacts were found to have been significant. This study’s research results potentially provide a scientific basis for the future comprehensive planning of flow path stability.
Effect of ENSO on the annual precipitation anomaly in Guanzhong Basin and southern Shaanxi China
Authors: Chen Y , Guo M , Qian H 
Published: November 2019

Abstract
East Asia has a unique geographic location, a vast territory, complex terrain, and a large population. In recent decades, the frequency of climatic oscillations in East Asia has increased, and many factors affect the climate of East Asia, with El Niño and the Southern Oscillation (ENSO) serving as one of the most important factors. In this study, through the collection and collation of 50 years’ worth of meteorological data for southern Shaanxi and central Shaanxi, the characteristics of climate change in these regions is analysed since 1951, and the correlation between precipitation, drought conditions, and ENSO is evaluated. Results show that the rainfall in the study region during an El Niño year is less than that of a ENSO neutral year, often triggering extremely dry weather. Moreover, the rainfall in a La Niña year is increased compared an ENSO neutral year, confirming that ENSO does affect the rainfall through “teleconnections”. Furthermore, given that the Qinling Mountain tectonic belt serves to diminish the ENSO signal, a large difference in rainfall exists between the foothills in the south and those to the north of the Qinling Mountains. The response mechanism in the north and south regions of Qinling Mountains acting on ENSO is consistent, indicating that the blockage effect of the Qinling Mountains on water vapour is strong related to low-level airflow. Through this research, we can begin to understand the physical mechanisms behind this phenomenon it in the central region of China and how we can effectively improve China’s short-term climate predictions. Such knowledge is tremendously important to China’s national livelihood and long-term economic development.
Study on key technologies of ammonia nitrogen on-line monitor based on distillation-conductivity method
Authors: Liu Z Y , Cai Y J , Liu T , Pan H T , Sun X F 
Published: November 2019

Abstract
The ammonia nitrogen on-line monitor based on distillation-neutralization titration (HJ 537-2009) is mainly suitable for the determination of ammonia nitrogen in domestic sewage and industrial wastewater. It has the advantages of wide measuring range, non-toxicity of reagents and waste liquor, etc. Focused on the water sample pretreatment system, conductance detection system and its key technologies to solve the problems including difficulty in precise sampling of water, difficulty in automatic addition of solid pH regulator, the low efficiency of distillation, the short stabilization time of mixing indicator, difficult to determine titration endpoints automatically and accurately (indicator discolouring point), long titration analysis time and so on. Meanwhile, a new ammonia nitrogen on-line monitor base on distillation-conductivity method was designed to measure some metering performance indexes, method detection limit (MDL) and limit of quantitation (LOQ). The results showed that the maximum absolute error of 0.02 mg/L on low concentration sample analysis (≤2 mg/L), the relative error reached -3.7 % on high concentration sample analysis (>2 mg/L). The method detection limit and limit of quantitation were 0.08 mg/L and 0.15 mg/L, respectively, which could satisfy the metering performance requirements in verification regulation of ammonia nitrogen automatic monitor.
Analysis on the present situation of the whole life cycle monitoring technology of standing pile wharf
Authors: Hong Z T , Huo Z Y , Wang C J , Ye S Q 
Published: November 2019

Abstract
The standing pile wharf long-term service in abominable natural conditions,it is easy to be damaged and may affect the structure safety of wharf. There are some hidden dangers in traditional testing methods. Therefore, it is very important to establish a set of whole life cycle monitoring system for wharf structure. This paper discusses the application status of monitoring technology in domestic and foreign engineering, discusses the components of the whole life monitoring system of high pile wharf and makes a brief analysis of its mechanism, focusing on the detailed discussion of the sensor module. The selection and arrangement of all kinds of sensors are discussed, and a new idea of sediment thickness monitoring is put forward.Then in light of the current research status of the monitoring system for the whole life surface of the high-pile wharf, the author puts forward some suggestions.
Multi-source heterogeneous data model for marine biological monitoring at intake of nuclear power plant
Authors: Meng Y H , Ai D W , Liu X L , Qin L , Lu H R 
Published: November 2019

Abstract
The reliability of the cold source is an important guarantee for the safe operation of the nuclear power plant, and the life of the sea threatens the safety of the cold source of the nuclear power plant. The threat of cold source in nuclear power plant is studied and analysed. Several methods of marine biological detection are proposed, including multi-source heterogeneous ontology extraction method based on sonar, underwater camera, water quality sensor and flow sensor. We suggest that a nuclear power plant in the biological monitoring and early warning procedures of cold source, and establish and monitoring model of sonar-optic composite monitoring model, and marine biological monitoring model, including spatial domain, these models are all consistent with the sea creatures that threaten the safety of nuclear power sources.
Research on the hydrological emergency monitoring system of high-risk Barrier Lake based on PDCA theory
Authors: Mei J Y , Zhang M B , Zhou B 
Published: November 2019

Abstract
In recent years, there have been some barrier lakes formed by earthquakes or landslides in China, such as the Tangjiashan barrier lake in 2008 and the Baige barrier lakes (twice) in 2018. The barrier lake often brings huge destructive risks to the upstream and downstream affected areas. In order to protect the lives and property of the people, it is necessary to carry out corresponding scientific disposal. The premise of disposal is to obtain detailed and reliable dynamic monitoring information. And hydrological monitoring information is the basis of various types of information. Therefore, hydrological emergency monitoring must be carried out to obtain the information. This paper summarizes and puts forward the design of the high-risk barrier lake hydrological emergency monitoring system based on PDCA theory, which can provide support and guidance for the implementation of hydrological emergency monitoring in the future, and it has a strong practical significance.
Research on microwave heating of exhaust gas particles in marine diesel engine
Authors: Tang W W , Wu L H , Chen A G , Zhou J X , Lin Z H 
Published: November 2019

Abstract
The diesel engine is widely used in the ship transportation industry due to the inherent advantages of its high thermal efficiency. With the increasing awareness of environmental protection and higher requirements on exhaust emissions, the post-treatment of particulate matter from diesel engine emissions has become a research hotspot. In view of the application of particle catcher in China, an improved microwave heating regeneration device for particulate matter from ship exhaust is proposed, and its efficacy is demonstrated.
Discussion on the analysis method of urban design rainstorm under the “new normal” of "city seeing the sea”
Authors: Ouyang S , Xu C J , Shao J , Guo W 
Published: November 2019

Abstract
In recent years, urban waterlogging has become a stubborn disease in major cities such as Beijing, Shanghai, Nanjing, Wuhan, and Xi’an. The city’s sea view is mainly due to the extreme torrential rain that exceeds the urban design and drainage capacity. Therefore, in view of the problem of domestic rains and inland “Seeing the sea”, this paper takes the typical heavy rain in Wuhan as an example. The typical rainstorm frequency analysis methods in the municipal department and the water conservancy department are using to measure rainstorm under different sampling conditions. The design frequencies of different grades rainstorm has been analyzed in municipal and water conservancy systems. While that is expected to definite the design frequency of different grades of heavy rain in municipal and water conservancy systems from the quantitative level. The matching relationship is expected between the rainstorm frequency analysis results of the two methods, which provide data support for the design standards of flood control and drainage in the construction of sponge cities.
Study on a water pollution simulation and analysis system based on WebGIS: A case study of Liyang City, Jiangsu Province
Authors: Kuang T Q , Du J L , Zhang Z M , Zhang W W 
Published: November 2019

Abstract
A surface water quality analysis and pollutant diffusion simulation system was studied and developed using WebGIS. This paper introduces the structural design, technology development and main functions of the system. Using Liyang City of Jiangsu Province as an example, an environmental water monitoring database was established. Based on the database, a comprehensive analysis and evaluation of water quality in Liyang City were determined and provided decision support for pollution management. In addition, two authoritative water pollution diffusion analysis models (including a one-dimensional model and a two-dimensional model) were integrated, and a dynamic simulation of water pollution accidents was constructed with the support of GIS technology.
Efficient removal of Cr(VI) from wastewater using magnetically separable poly(m-phenylenediamine) particles
Authors: Chen Z W , Zhou Z H , You K , Zhong Z , Zhang J , Li Q L 
Published: November 2019

Abstract
The magnetic polymer adsorbent Fe3O4@poly (m-phenylenediamine) (Fe3O4@PmPD) was formed at room temperature (25°C) by chemical oxidative polymerization using Fe3O4 and m-phenylenediamine (mPD). The effects of the Na2CO3 concentration and Fe3O4 mass used in the synthesis on the adsorption capacity were studied. The effects of contact time, initial concentration and temperature on adsorption were individually analyzed. The equilibrium data were evaluated by kinetic and thermodynamic models. The highest adsorption capacity of the material was 654.4 mg/g at room temperature and pH=2. Finally, the recyclability of the materials was tested by cycling experiments. The material could be recycled and retained 73.18% of its initial adsorption capacity after 5 cycles. The magnetic polymer material exhibits excellent hexavalent chromium removal capacity and broad application prospects in the treatment of chromium-containing wastewater.
Evaluate the efficiency of water conservancy investment in Shaanxi Province based on super-efficient DEA and malmquis index
Authors: Zhu J W , Jing X N , Guo P L , Jiang J J 
Published: November 2019

Abstract
Water conservancy construction is an important infrastructure related to national economic and social development, and effective water conservancy investment is the premise guarantee for water conservancy reform. Therefore, it is necessary to study the efficiency of water conservancy investment. The efficiency of water conservancy investment in Shaanxi Province is evaluated by the super-efficiency DEA model and the Malmquist index. The results show that the comprehensive efficiency of water conservancy investment in most regions of Shaanxi Province increased steadily from 2012 to 2017, and pure technical efficiency is the main reason that hinders the further improvement of the efficiency of water investment in various regions. Therefore, it is necessary to strengthen technological innovation, optimize organizational structure, continuously adopt advanced technology, and expand the scale of water conservancy construction in order to attain the maximum value of investment.
Three-dimensional stability analysis of a deep excavation with seepage in Karst deposit
Authors: Zhang J , Zhu B , Pan X , Zeng X B , Luo C M , Wu J H 
Published: November 2019

Abstract
Groundwater seepage is an important factor threatening the safety of excavation. In order to reduce the threatening, a simulation of excavation and the seepage process in Guilin city is carried out by FLAC3D. The paper establishes a three-dimensional numerical model through spline interpolation method. The model built by the system of CAD can show the scope of an ancient collapse and the topological relationship among the soil layers in small scale. After that, the fluid-solid coupling technology is used to the pore pressure calculation, which adjusts the parameter by comparing the model simulation results and the site observation results. The regular pore pressure in the excavation is obtained. The results show that the pore pressure fluctuates greatly in excavation area nearby the ancient collapse during the excavation process, the local upward seepage can be driven and flow up under the reverse hydraulic power. It provides suggestions for the excavation construction and as a reference for analyzing stable seepage of groundwater in deep excavation.
Synergetic assessment of water, energy and food nexus system
Authors: Zhang T , Tan Q , Zhang S , Zhang T Y 
Published: November 2019

Abstract
Water, energy and food are three important resources for human to face serious security risks. A systematic perspective, namely Water, Energy and Food Nexus (WEFN), was proposed to achieve the sustainable human development. In this study, a method of hierarchical weight assignment based on synergetic theory and Shannon information theory was applied in the Bayan Nur city, China. Through calculating order degree of order parameter components of resources, society, economic and environmental dimensions, the order degree of order parameters and sub-systems and the order entropy were obtained. It is found that water resources supply, energy supply, energy consumption and food price would dominate the corresponding trends in water, energy and food sub-systems respectively. The water and food sub-system may play a more dominant role in the harmonious assessment of WEFN system in the study area. Although the variance of the order degree of sub-systems and the order entropy were small, the WEFN system was still moving toward an unstable state, which could aggravate the inharmonious degree of WEFN system in the study area.
Mapping of precipitation in extreme rainfall events in Zhuhai, China
Authors: Bao Z D , Yang Q Q , Chen H , She N , He W N 
Published: November 2019

Abstract
Floods caused by extreme rainfall events have been a predominant water-related issue to coastal cities in Pearl River Delta (PRD), China. In 2017 and 2018, Typhoon Hato and Mangkhut hit the area consecutively, caused severe damages in Zhuhai as well as in other adjacent cities. To combat the inverse impact of these extreme events, adequate emergency response, infrastructure upgrade, and appropriate urban planning are necessary to against the potential extreme rainfalls in future, but all depending on the standards of urban flood protection and storm-water drainages. Precipitation amounts responding to given return-periods are essential parameters for computing the required standards; however, due to the lack of long-term historical observational precipitation records in Zhuhai, it is difficult to precisely predict the value, then a rough prediction was applied in the whole city without considering the spatial variation of extreme precipitation. To specify the spatial distribution of precipitations for given return-periods in Zhuhai, ground-based rainfall observation were analyzed with combined of generalized extreme value (GEV) model and spatial interpolation techniques to compute the precipitation responding to varied given return-periods. The spatial distributions of precipitation in given return-periods offer a more accurate and spatial varied prediction. The information provides reasonable support for Zhuhai’s city manager to conduct proper strategies for emergency response, infrastructure upgrade, and future urban planning to against extreme rainfall events.