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The objective of this paper is to evaluate seismic-led point source and non-point source water pollution, under the seismic hazard of 10 % probability of exceedance in 50 years, and with the minimum value of the water quality standard in Sichuan, China. The soil conservation service curve number method of calculating the runoff depth in the single...
... The frequency of keywords related to risk assessment was 207 times, accounting for 8.77%. The high-frequency keywords constitute 'environmental risk' , 'health-risk' , 'quality assessment' , 'soil and water assessment tool' , 'water assessment-tool' , etc. Load calculation model, Source identification technology, and water quality index assessment method were the most common assessment tools for NPS pollution [1,41,85]. Most risk assessment methods were focused on the single pollutant of soil and water, the integration of a comprehensive assessment method for multiple chemical and biological contaminants, and the impact of NPS pollutants on human health risk is a future research focus [5,41]. ...
Background With effective control of point source pollution, non-point source (NPS) pollution has been widely concerned as the primary reason for the improvement of global water environmental quality. Some bibliometric analysis related to NPS pollution has been carried out before the mid-2010s. Analyzing the research status and hot issues of NPS pollution in the past decade is important for guiding the control and management of NPS pollution in the future. Results A bibliometric analysis was conducted based on 3407 publications retrieved from the Web of Science during 2012–2021. China, USA and UK were the most productive countries. Sci. Total Environ, Environ. Sci. Pollut. Res, and Water were the most productive journals. The NPS pollutant, pollution types, driving forces, technology and the research object were retrieved from the keywords analysis. The common NPS pollutants of nitrogen, phosphorus, and heavy metals grabbed the highest attention, while the emerging contaminants have attracted increased attention. The migration and transformation of agricultural NPS pollution and urban NPS pollution driven by climate change and land use change were hot issues related to NPS pollution studies. Technologies related to the combination of 3S technology (RS, GIS, and GPS) and NPS pollution models, the sustainable control technologies, the technology of accurate traceability and automatic monitoring, and the comprehensive management plan were the important research areas related to NPS pollution. Although the research locations were mostly concentrated in the surface water and groundwater, the ocean and drinking water have great potential for future research. Conclusions This study illustrates the global focuses related to NPS pollution during 2012–2021 according to analyzing the publication outputs, source journals, source country, author, institution and the high-frequency keywords. Results demonstrated that the migration and transformation mechanism and ecological risk assessment for heavy metals and emerging pollutants, accurate traceability techniques, sustainable ecological restoration control techniques, and marine pollution have attracted rising attention. Additionally, developing countries will have a higher interest in NPS pollution in the future, because developed countries have already made great progress in controlling NPS pollution.
Background With the effective control of point source pollution, the non-point source (NPS) pollution has been widely concerned as the primary reason for the improvement of global water environmental quality. At present, China is one of the countries with the highest research attention on NPS pollution. The Chinese government pays great attention to the environmental problems caused by the NPS pollution. Therefore, it is of great significance to clarify the global trends of NPS pollution and illustrate the importance of China on the NPS pollution research around the world. Results A bibliometric analysis was conducted based on 3407 publications retrieved from the Web of Science during 2012–2021. China, the USA and UK were the most productive countries. Articles published from China accounting from 23–50% between 2012–2021. Regarding the top 20 most productive authors, 17 of them from China. The most productive 21 institutions were located in China (15) and the UK (6). The Chinese Academy of Sciences stood out, followed by the Beijing Normal University. The Sci. Total Environ ranked first in the most productive journals, followed by Environ. Sci. Pollut. Res and Water. China was the major contributor to these journals, accounting from 24–79%. The most highly cited articles were published in Proc. Natl. Acad. Sci. U.S.A. The keywords analysis showed that nitrogen and phosphorus were the common NPS pollutants. Agricultural NPS pollution and urban NPS pollution were the main NPS types. The land use change, rainfall and irrigation were the main driving factors of NPS pollution. Load calculation and Integrated management were the key points of NPS pollution technology research. The NPS pollution research objects were mainly distributed in the surface water and groundwater, while the ocean might be the hot areas in the future research. Conclusions This study demonstrates the global trend of NPS pollution research during 2012–2021 according to analyzing the annual publication outputs, source journals, source country, author, institution and the high-frequency keywords. Meanwhile, the importance of China on NPS pollution research is explained from the bibliometrics perspective. It is beneficial for guiding the future research of NPS pollution.
With the continuous occurrence of natural disasters, natural hazard triggered technological accident (Natech) risks also follow. At present, many countries have performed much research on Natech risks. However, there is still a lack of Natech research at the regional or watershed level in China. The Yangtze River Economic Belt (YREB) is not only an industrially intensive development area but also an area with frequent natural disasters. In this study, we selected the YREB as a typical case to study the Natech risk triggered by floods, geological disasters, and typhoons at the regional or watershed level. Four types of risk indicators representing risk sources, natural hazard factors, control levels, and vulnerabilities were developed to assess the spatial patterns of the Natech risks of the YREB. The results show that the Natech risk triggered by floods and typhoons is more serious in eastern area and central area than in western zone and that the Natech risk triggered by geological disasters is more serious in the west part. Approximately 7.85% of the areas are at relatively high-risk and above the Natech risk level based on the comprehensive assessment of three types of Natech risks. The combined population of these areas accounts for approximately 15.67% of the whole YREB, and the combined GDP accounts for approximately 25.41%. It can be predicted that the occurrence of Natech risks in these areas will cause serious harm to both the people and the economy. This work will provide the basis and key management direction for Natech risk management in the YREB.
This research article depicts a comprehensive review of scientific research advancement on nonpoint source pollution (NPS) in 2016. The causes, impacts, and methods used to mitigate nonpoint source pollution were reviewed. In addition, the assessment of nonpoint source pollution using different modeling techniques, coupled with evaluation and management tools were reviewed. Innovative technologies to reduce nonpoint source pollution were also reviewed in this paper.