Article
Engineering, Civil
Zengliang Luo, Quanxi Shao, Huan Liu
Summary: The construction of dams and sluices has both positive and negative impacts on river water quality and water ecology. Different regulations for dams and sluices based on various objectives and interests can lead to varying degrees of impact on water quality and water ecology. Studying short-term and long-term scenarios of regulation with different discharge levels is crucial for effective water resources management.
JOURNAL OF HYDROLOGY
(2021)
Article
Green & Sustainable Science & Technology
Pawel Tomczyk, Patrick Willems, Miroslaw Wiatkowski
Summary: The article assesses the impact of hydropower plants on the hydromorphological conditions of rivers, finding that upstream sections have a moderate state, while downstream areas show poor conditions and reference sites are in good shape. The study reveals that the hydromorphological conditions are mainly influenced by anthropogenic pressures, obstacles in the riverbed, river regulation, and changes in the hydrological regime.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Ecology
Yang Chen, Yuhong Wang, Bernadette Chia, Dawei Wang
Summary: This study assessed changes in water quality of two completed river restoration projects and found general improvements in water quality at one project but not at the other. Results indicate that not only water quality, but also the effects of restoration on water quality are subject to seasonal variations. Correlations between certain water quality parameters point to common sources of pollution in the urban context.
ECOLOGICAL ENGINEERING
(2021)
Article
Environmental Sciences
Zhi-Min Zhang, Fei Zhang, Jing-Long Du, De-Chao Chen
Summary: This study evaluated the spatiotemporal variations in water quality for the Nanxi River in the Taihu watershed of China and identified potential sources of contamination using a water quality index (WQI) and multivariate statistical techniques. The results showed that most monitoring stations exhibited continuous improvement in water quality, and important parameters affecting spatial variations included pH, petroleum, volatile phenol, and others. Factor analysis identified four potential contamination source types.
Article
Environmental Sciences
Qiaoli Wang, Zijun Li, Yu Xu, Rongrong Li, Mengsheng Zhang
Summary: This study assesses the water quality and its health impact in Hong Kong's four water control zones using four years of monitoring data. Results indicate significant interannual and spatial variations in water quality parameters, with overall improvement trends over time. Pollution sources are attributed to human activities and natural processes. The carcinogenic risks of trace elements are negligible, but noncarcinogenic harm may be caused by manganese and arsenic.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Review
Environmental Sciences
Praharsh S. Patel, Dishant M. Pandya, Manan Shah
Summary: Water is essential for drinking, irrigation, and industry. Poor groundwater quality caused by excessive fertilizer application and unhygienic circumstances has a direct impact on human health. To investigate water quality, various statistical methods are used, with Principal Component Analysis and Factor Analysis being the most widely explored techniques. This review paper discusses Multivariate Statistical Techniques and their significance in assessing water quality, providing a comprehensive table that showcases the methods, computational tools, water bodies, and regions involved.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Environmental Sciences
Deepika Slathia, Karan Dev Jamwal
Summary: The present study evaluates and characterizes the water quality of River Tawi in Jammu city of Union Territory of J&K. The results show spatial and temporal variations in the water quality, with pollution levels increasing from upstream to downstream sites. Comparison with drinking water standards revealed elevated levels of certain parameters. Principal component analysis identified the main sources of pollution. The study recommends the installation of sewage treatment plants to improve water quality.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Water Resources
Yan Yang, Xing Huang, Xi-qiao Wu, Chao-rong Liu, Shi-yong Zhao, Xiao-hua Zhu
Summary: The spatiotemporal variations of water quality and potential pollution sources of Qujiang River were studied using comprehensive pollution index (CPI) and multivariate statistical techniques (MST) based on water quality data from 2015 to 2019. The water quality parameters of Qujiang River generally meet the class 3 value of environmental quality standards for surface water in China. Cluster analysis and principal component analysis identified distinct patterns in the water quality characteristics and explained the majority of the variance. The results also showed significant differences in certain parameters among the monitoring sections, with Baita section experiencing more serious pollution.
APPLIED WATER SCIENCE
(2023)
Article
Agricultural Economics & Policy
Frank Jensen, Venticia Hukom, Rasmus Nielsen, Max Nielsen
Summary: This paper discusses an upstream-downstream externality related to water quality in a river, using the Porong River in Indonesia as a case study. The findings show that polyculture has a higher optimal profit compared to industrial firms, and the optimal gain of moving to joint management is reasonably high.
AQUACULTURE ECONOMICS & MANAGEMENT
(2023)
Article
Environmental Sciences
Chun-Chun Lin, Shang-Lien Lo, Sofia Ya-Hsuan Liou
Summary: This study applied multivariate statistical analysis (MSA) to synthetic data simulated by a river water quality model, and found some misinterpretations in the number and location of pollution sources. It also provided a correct interpretation method for the results of principal component analysis (PCA). Additionally, it discovered that the solid and liquid partition coefficients of pollutants can affect the interpretation of PCA results. Therefore, these influencing factors should be considered when tracing pollution sources, in order to enhance the effectiveness of pollution traceability.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Environmental Sciences
Mohamed El Sayed Taher, Ahmed M. Ghoneium, Russell R. Hopcroft, Wael S. ElTohamy
Summary: The study examined temporal and spatial variations of surface water quality in the Nile River in the Damietta region, showing higher pollution levels upstream. Factor analysis identified five main influences, while Discriminant analysis revealed only 11 parameters were necessary for distinguishing temporal variations. Spatial variations were mainly influenced by seven key parameters, indicating the importance of certain variables in water quality assessment.
ENVIRONMENTAL MONITORING AND ASSESSMENT
(2021)
Article
Environmental Sciences
Xuan Pang, Yao Gao, Mingfu Guan
Summary: Urbanization has various impacts on river water quality, and understanding these impacts is crucial for effective river management. This study investigates the relationship between urbanization and two key pollutants in stream flows: nutrients and pathogens. Instead of using traditional economic or demographic metrics, our approach considers anthropogenic activities as indicators of urbanization and evaluates their effects on water quality parameters. The study also assesses the impact of urbanization on nutrient and pathogen trends in river waters in Hong Kong.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Management
Jie Wu, Wei Lu, Xiang Ji
Summary: An increasing number of online platforms are entering retail markets, sharing manufacturers with traditional retailers. This study focuses on the platform entry strategy in a supply chain, considering two common distribution contracts (reselling and agency selling) between the manufacturer and the online platform. The study finds that downstream entry leads to increased quality information disclosure by the manufacturer, and the choice of distribution contract affects the transparency level of the supply chain. Contrary to conventional wisdom, entry does not necessarily harm existing traditional retailers due to increased quality transparency.
EUROPEAN JOURNAL OF OPERATIONAL RESEARCH
(2023)
Article
Multidisciplinary Sciences
Nur Ain Ishak, Noor Idayu Tahir, Syafi'ah Nadiah Mohd Sa'id, Kathiresan Gopal, Abrizah Othman, Umi Salamah Ramli
Summary: Advances in phytochemical analysis have provided crop researchers with a wealth of data, enabling tracking and differentiation of metabolites as well as observing the impact of stimuli on metabolite abundance. Evaluation of different statistical software tools can guide data analysis in oil palm phytochemistry.
Article
Water Resources
Jalal Valiallahi, Saideh Khaffaf Roudy
Summary: In this study, spatial variations and water quality data of the Zohrehh River were evaluated using multivariate analytical techniques, with a focus on the impact of agricultural fertilizers on downstream stations near the ASK dam.
APPLIED WATER SCIENCE
(2021)