Bibliometric Analysis of Optimal Scheme Selection for Water Conservancy Projects by ZHANG Boyang

“…Water conservancy projects are closely related to people's livelihood.This study aims to systematically analyze the current situation of research on optimal scheme selection for water conservancy projects and explore the related research methodology.To achieve these goals,we make a bibliometric analysis based on the literature on optimal scheme selection for water conservancy projects which is included in China National Knowledge Infrastructure (CNKI),a hotspot clustering analysis with the help of the visual analysis function of VOSviewer,and an analysis of the number of published papers depending on the annual loss statistics of flood disasters in China.Cluster analysis includes two aspects:co-authorship in China and keyword co-occurrence. …”
Get full text

Climate Projection of Dongjiang River Basin Based on Statistical Downscaling Methods by DU Yi

“…For higher reliability of climate projections in the Dongjiang River Basin,various methods are used to statistically downscale the air temperature and precipitation output generated by the global climate model CanESM2.The results reveal that SDSM and Delta have good downscaling simulations on the temperature and precipitation in the Dongjiang River Basin,respectively.For temperature,the daily minimum temperature will increase by 2.26 ℃ (RCP4.5) and 3.65 ℃ (RCP8.5);the daily mean temperature will increase by 2.70 ℃ (RCP4.5) and 4.69 ℃ (RCP8.5),and the daily maximum temperature will increase by 2.79 ℃ (RCP4.5) and 4.95 ℃ (RCP8.5) by the end of the 21^st century (2081—2100) relative to the benchmark period (1961—2005).In terms of precipitation,the annual precipitation will rise at a rate of 16.4 mm/10a,8.7 mm/10a,and 25.4 mm/10a under the RCP2.6,RCP4.5,and RCP8.5 scenarios,respectively.In addition,the temperature increase is more prominent in summer and winter,while precipitation increases more in summer and autumn.Overall,the risk of temperature extremes and precipitation extremes in the Dongjiang River Basin during the flood season may increase in the future.…”
Get full text

Analysis of Extreme Precipitation Events in Ganjiang River Basin Since the Second Half of the 20th Century by ZOU Xiongyuan, LIU Yanping, WAN Dan, WU Xia, ZHENG Kang, ZHAO Junkai

“…Under the background of global warming,the frequency of local extreme precipitation events increases gradually.This paper selects six extreme precipitation indexes such the extreme precipitation threshold (EPT),extreme precipitation (R95),extreme precipitation days (RD95),extreme precipitation intensity (RI95),maximum precipitation for five consecutive days (RX5day) and maximum precipitation for one day (RX1day),and analyzes the extreme precipitation events in Ganjiang River Basin from 1964 to 2013 by percentile threshold method,M-K trend analysis method,sliding t test method and Kriging spatial interpolation method.The results show that:①The extreme precipitation index of most stations in Ganjiang River Basin shows non-significant upward trend;②The mutation time of extreme precipitation index of each station is mostly concentrated in the 1980s and 1990s,and a few stations have significant mutation (α=0.01);③Except for RD95,all the extreme precipitation indexes decrease from east to west,on the contrary,RD95 decreases from west to east.The research results can provide reference for flood control,disaster reduction and water resources development and utilization in Ganjiang River Basin.…”
Get full text

Study on the Optimization of Aeration Scheme for a Spillway by SHI Die, LI Guodong, HE Cuiling, LI Pengfeng

“…Cavitation damage is easy to occur in discharge structures with high head and large flow.Based on the spillway project of a hydropower station in Northwest China,this paper studies the aeration and cavitation mitigation of spillway through the single hydraulic model test.The experimental results show that:The velocity of spillway chute is larger and the flow cavitation number is less than 0.3 under different conditions of flood frequency,so it is necessary to set up aeration and cavitation mitigation facility.Through the analysis of the cavitation mitigation effect of three different aerators,it can be seen that the aerator with flip bucket can mitigate cavitation,but there are different degrees of splash in the downstream.The aerator with convex bucket can form a stable cavity,and there is no splash in the downstream.The aerator with chute can form a stable cavity and flow pattern in the chute,and it is easy to construct,so it is the optimal aerator.In the optimal aerator,the aeration concentration from aerator to the front of the bucket lip is higher,which is 0.9%~63.1%,the aeration effect is good,and the purpose of aeration and cavitation mitigation is achieved.The research results can provide theoretical guidance and technical support for the follow-up energy dissipation and erosion control research of this project and the aeration and cavitation mitigation research of similar projects.…”
Get full text

Applying Environmental Isotope Theory to Groundwater Recharge in the Jiaozuo Mining Area, China by Pinghua Huang, Xinyi Wang

“…The research conclusion holds a certain value for the flood evaluation of local coal mines.…”
Get full text

Geografia e justiça ambiental: estudo de capacidade de suporte do Quilombo da Fazenda by Danilo Santos da Silva, João Osvaldo Rodrigues Nunes

“…Using Ecodynamics criteria, namely geostatistical modeling combining susceptibility data of gravitational movements of mass, slope, and flood, with the occurrence of species and forest richness, the study classified three different environmental support capacity high, medium and low.…”
Get full text

Impact of Urbanization Process on Extreme Precipitation Events Based on Non-Stationary GEV Model by WU Haoran, LAN Tian, CHEN Yongqin, WU Yanrui, QIAO Tianling, LI Minglin

“…This is of great significance for urban flood control.…”
Get full text

Application of SWAT Model for Runoff Calculation in Small Watershed of Zhejiang Province by LAN Xuechun, WANYAN Sheng, ZHANG Zhenqi

“…To verify the applicability of the SWAT model in runoff calculation in small watershed of Zhejiang province,this paper collects daily records for the past 20 years from Wenling meteorological station,topographic map,land use and soil data,and establishes the SWAT model of the Human reservoir by using the SWAT2012 module loaded with Arcgis 10.2 software.In calibration period (1999—2008),R² (correlation coefficient) is 0.89 and E_NS (Nash-Sutcliffe efficiency) is 0.88;in validation period (2009—2018),R² is 0.93 and E_NS is 0.91.With an error of 1.3%,the simulated annual average flow is 0.8 m³/s and the observed flow is 0.79 m³/s,which indicating a high accuracy of the model.The sensitivity test of input parameters shows that the SOL_AWC.sol (available water capacity of soil) and CN2.mgt (runoff coefficient of different land use) are significant to simulated results.The model can be further used for forecasting the flood process and peak flow of Human reservoir,as well as optimizing the reservoir operation scheme and formulating the protection program of water source.…”
Get full text

Review Sistem Drainase Parak Jambu Dadok Tunggul Hitam Padang Menggunakan Model EPA-SWMM by Mas Mera, Februarman Februarman, Fandi Aryadwitama Priadi

“…Flood disasters have been a never-ending problem for humans all over the world from the past to the present. …”
Get full text

Amethyst Deposits of the Los Catalanes Gemological District (Artigas Department): The First Uruguayan IUGS Geological Heritage Site by César Goso, Mauricio Faraone

“…It is part of one of the most important continental flood volcanism episodes on Earth (end of Jurassic to Early Cretaceous). …”
Get full text

Turner’s 1836 Alpine Crossing and the Little Ice Age Portrayed in Val Veny and Val Ferret; a Geography of the Sublime by Martin P. Kirkbride, Susan P. Mains, Vanessa Brazier

“…The second is a major oil painting re-imagining of the 1717 Triolet disaster which conflates the complex geomorphological processes of this rock-ice avalanche and subsequent outburst flood into a single dramatic scene. Turner’s visit coincided with the mid-nineteenth century maximum advance of glaciers in the region allowing him to witness dynamic geomorphological processes in close proximity. …”
Get full text

Medium- and Long-term Runoff Prediction Based on SMA-LSSVM by TIAN Jinghuan, LI Congxin, LI Ang

“…Medium-and long-term runoff prediction is extremely important for flood control,disaster reduction and the utilization efficiency improvement of water resources.To avoid the influence of prediction model parameters on prediction accuracy,this paper proposes a medium-and long-term runoff prediction model based on least squares support vector machine (LSSVM) optimized by the slime mold algorithm (SMA).Firstly,five standard test functions are selected to compare the simulation results of SMA and particle swarm optimization (PSO) algorithms in different dimensions.Secondly,SMA is used to optimize the penalty parameters and kernel parameters of LSSVM,and the comparison models of LSSVM and PSO-LSSVM are constructed.Finally,the models are verified with the monthly runoff of Manwan Hydropower Station Reservoir and Yingluoxia Hydrological Station as prediction examples.The results show that the mean square error of the SMA-LSSVM model is 29.26% and 7.42% lower than those of the LSSVM and PSO-LSSVM models,respectively,in the monthly runoff prediction of the Manwan station,and 32.61% and 6.61% lower,respectively,in the monthly runoff prediction of the Yingluoxia station.The proposed SMA-LSSVM model has better comprehensive prediction performance and also provides a new method for medium- and long-term runoff prediction.…”
Get full text

Escape or encouragement? The role of media entertainment during the COVID-19 pandemic in China by Deya Xu, Ge Zhu, Fang Wu, Zhiwei Xu

“…This study examines whether media entertainment helped Chinese people escape from the flood of pandemic-related information or encouraged them to take preventive measures and protect themselves during the COVID-19 pandemic. …”
Get full text

MAS-Based Interaction Simulation within Asymmetric Information on Emergency Management of Urban Rainstorm Disaster by Qing Yang, Jinmei Wang, Xingxing Liu, Jiajia Xia

“…Improved adaptive prevention and control strategies are highly requested due to huge economic losses and casualties caused by flood and waterlogging in China. The urban waterlogging may evolve into a serious emergency, generally characterized by high complexity, uncertainty, and time pressure. …”
Get full text

Retrospect and Prospect of Existing Problems and Scientific Planning in Macau Marine Space by YANG Jing, SHUI Bing, NI Mingxuan

“…The Macao Special Administrative Region is located at the outlet of the Pearl River.It is a typical beach land.It has expanded from 2.78 km² in 1840 to more than 32 km² at present.All the land is reclaimed from the sea.It is one of the regions with the highest proportion of land reclamation in the world.By reviewing the history of land reclamation in Macao Special Administrative Region,examining the current situation of water quality and excavating the existing problems of sea area development,this paper puts forward that it is necessary to establish a unified administrative structure in charge,strengthen pollution control,improve rain and sewage diversion treatment and discharge capacity,establish a pollution discharge permit system,promote regional legal cooperation and linkage law enforcement,and build a data platform.To achieve multi-party data fusion and other measures,so as to realize the advance planning of the sea area and scientific decision-making,so as to generate into the sea,improve the disaster resistance capacity of flood control and moisture-proof in the Macao Special Administrative Region,and better serve the development of the sea area and diversified economic construction of the Macao Special Administrative Region.…”
Get full text

Fault Diagnosis of Hydraulic Hoist Based on Digital Twin and Bayesian Network by WANG Bo, SUN Ruiyang, QIAN Lu, GU Hao, NIE Xiangtian

“…Hydraulic hoist plays a key role in ensuring the safe operation of water conservancy facilities, flood control and drainage, and water resource scheduling. …”
Get full text

DEEPENING CONVICTIONS; LEADING FOR RELIGIOUS LITERACY BASED ON PESANTREN by Umar Umar

“…The flood of information due to the emergence of information technology makes it easier for someone to view and study any information obtained without meeting the author face to face. …”
Get full text

Study on Structure and Seepage Control Safety of Second-Phase Cofferdam in Datengxia Water Conservancy Project by ZUO Yongzhen, CHEN Liang, XU Han, LI Bo, CHEN Jinsong

“…The second-phase earth-rock cofferdam in the Datengxia Water Conservancy Project is one of the most important temporary buildings,and its design and construction reflect major key technologies of the Datengxia Water Conservancy Project.In order to ensure the safety of the second-phase deepwater cofferdam project,a special scientific research demonstration was conducted on the structure and seepage control safety of the second-phase deepwater cofferdam.In view of the difficulty in determining the density of the cofferdam formed by deepwater dumping and the feasibility of the anti-seepage system with a single anti-seepage wall connected to the geomembrane,experimental research was carried out through the centrifugal model test,so as to determine the underwater dumping density and angle of repose,the mechanical characteristics of cofferdam filler,the shear characteristics of the interface between filler and plastic concrete,and the characteristics of plastic concrete materials.The finite element analysis of stress deformation and the seepage stability analysis of the cofferdam were carried out,and the safety analysis evaluation and the section optimization design of the cofferdam were performed.The second-phase cofferdam has undergone two flood seasons of safe water retention operation,with a small total seepage flow,slight maximum settlement,and low horizontal displacement.The scientific research work has well supported the design requirements.…”
Get full text

Reliability Analysis of Water Intake Based on MIKE Model by LIANG Zhihong, ZHENG Jiangli, CHEN Xiuhong, LIU Xia

“…The reliability of water intake is one of the main factors affecting the operation of the project,and is a prerequisite for the project to be put into use.Taking the 10 million-ton-level metallurgical new material industrial base in Wuzhou as the research object,based on the MIKE21 module in the MIKE software,this paper establishes a hydrodynamic model for verifying the reliability of the existing water intake scheme,as well as puts forward the corresponding countermeasures for the scheme with water intake risk.The results show that:①During the dry season,the water level of the Changzhou Water Control Project is relatively high,and the reservoir storage can meet the design water intake quantity of the project;②During the normal water period,the gates of Changzhou Water Control Project need to be opened to ensure the safety of flood control.If the inflow of the Shangxiaohe tributary of Xunjiang River is abundant,the project is guaranteed with water intake.If the inflow of the Shangxiaohe tributary is small,the project will have water intake risk;③Countermeasures such as dredging the river channel and lowering the water intake can effectively increase the water intake of the project,thereby avoiding the water intake risk of the project during the normal water period.The research results are of guiding significance for the construction of the 10 million-ton-level metallurgical new material industrial base in Wuzhou,and of theoretical significance for water intake reliability analysis through MIKE21.…”
Get full text

Temporal and Spatial Characteristics of Precipitation in Minjiang River Basin in Recent 65 Years by DU Cong, LI Hong, YOU Lihua, SONG Wenwu, MA Longwei

“…On the basis of the daily precipitation data of 50 meteorological stations in the Minjiang River Basin from 1956 to 2020,this paper conducts the trend change analysis and mutation test on annual and maximum seasonal precipitation by using the linear trend analysis,cumulative departure test,and sliding t-test.It reveals the temporal and spatial change of precipitation in the Minjiang River Basin and each component of the basin.The results indicate that the annual precipitation in the Minjiang River Basin inches up year by year with a slight change rate of 1.028 mm/10a from 1956 to 2020 and shows an increasing spatial distribution pattern from the northwest plateau to the southeast basin.The annual precipitation in the upper reaches of the Minjiang River Basin increases year by year at a rate of 11.711 mm/10a,presenting a significant rising tendency after 2017.The variation trends of precipitation in the middle and lower reaches of the Minjiang River Basin share a similar declining trend for a long time since the 1960s,with sudden changes in precipitation also occurring during this period.This paper seeks to provide references for understanding the temporal and spatial change of precipitation in the Minjiang River Basin and stipulating response measures for flood disasters and rational utilization of water resources in the basin.…”
Get full text