Article
Engineering, Marine
Mohamad Alkhalidi, Abdalrahman Alsulaili, Badreyah Almarshed, Majed Bouresly, Sarah Alshawish
Summary: The study reveals high environmental pressure on Kuwait's coastal water, with low dissolved oxygen levels, high water temperature, and salinity in 2017 causing fish death events.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Article
Environmental Sciences
Karla Lorrane de Oliveira, Ramatisa Ladeia Ramos, Silvia Correa Oliveira, Cristiano Christofaro
Summary: This study evaluated the water quality data from 14 stations surrounding the Irape HPP reservoir in Brazil, finding better water quality conditions in the reservoir and immediate surrounding lotic stations, possibly due to greater sedimentation in the lentic environment. Analysis indicated that agricultural activities and geochemical characteristics are the main factors responsible for changes in water quality.
ENVIRONMENTAL MONITORING AND ASSESSMENT
(2021)
Article
Biotechnology & Applied Microbiology
Reham M. Elkorashey
Summary: This study used chemometric techniques to evaluate the water quality status of Bahr El-Balm drain in Egypt and classified the sampling sites based on similarity. The results showed that water quality was significantly influenced by seasonal variation, with anthropogenic and biogenic activities being the major sources of variability. The study highlights the importance of chemometric techniques in understanding spatial and temporal variations in water quality.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2022)
Article
Environmental Sciences
Nguyen Thanh Giao, Phan Kim Anh, Huynh Thi Hong Nhien
Summary: The study analyzed the water quality of rivers and canals in Dong Thap province, focusing on key parameters affecting water quality, and identified potential water pollution sources that need to be continuously monitored.
Article
Environmental Sciences
Kei Nakagawa, Hiroki Amano, Ronny Berndtsson
Summary: A study conducted in Shimabara Peninsula, Nagasaki, Japan revealed that nitrate pollution in groundwater is mainly sourced from agricultural fertilizers and livestock waste. The polluted groundwater is predominantly distributed in northeastern, northwestern, and southwestern areas, with a chemistry characterized by (Ca+Mg)-(SO4+NO3) type due to nitrate pollution. Principal component analysis and hierarchical cluster analysis identified the key factors controlling water chemistry and classified groundwater into different groups, highlighting the impact of nitrate pollution.
Article
Environmental Sciences
Vinod Kumar Kushwah, Kunwar Raghvendra Singh, Nakul Gupta, Parveen Berwal, Faisal M. Alfaisal, Mohammad Amir Khan, Shamshad Alam, Obaid Qamar
Summary: This study investigated the quality of the Gomti River water in Lucknow, India and analyzed its sources of pollution. The results suggest that storm water runoff and domestic and industrial wastewater discharge are the major sources of pollution in the river. This study is of great importance for policy makers to ensure sustainable water resource utilization.
Article
Engineering, Environmental
Vishal Panghal, Pawan Sharma, Sharma Mona, Rachna Bhateria
Summary: This study evaluated the groundwater quality in Tosham block, Bhiwani District, Haryana, India, and its neighboring villages, finding that most of the samples exceeded the permissible limits for total hardness, iron, and chloride. The water quality index indicated poor to very poor water quality in the majority of samples, with high values mainly due to total dissolved solids, electrical conductivity, total hardness, Mg, Cl, and Fe. Treatment of groundwater before use for drinking and other domestic activities is recommended to prevent contamination.
ENVIRONMENTAL GEOCHEMISTRY AND HEALTH
(2022)
Article
Green & Sustainable Science & Technology
Aysegul Yetis, Fatma Akyuz
Summary: This study assessed the surface water quality of the Ahlat Marshes in Turkey using multivariate statistical techniques and compared the results with national standards. The analysis identified factors affecting water quality and emphasized the importance of timely management and monitoring for the sustainability of wetlands. Overall, while some issues were found, there is no serious risk situation at present.
ENVIRONMENT DEVELOPMENT AND SUSTAINABILITY
(2021)
Article
Engineering, Civil
Honghua Liu, Jing Yang, Ming Ye, Scott C. James, Zhonghua Tang, Jie Dong, Tongju Xing
Summary: This study introduced t-SNE as a graphic approach to assist cluster analysis for groundwater geochemistry data. Compared to PCA, t-SNE performed better in assisting cluster analysis, showing promise as a tool for determining cluster numbers and delineating spatial zones.
JOURNAL OF HYDROLOGY
(2021)
Article
Environmental Sciences
Zeynab Ghaemi, Masoud Noshadi
Summary: This study used multivariate statistical methods to analyze the physicochemical parameters of 34 rivers over a 17-year period and divided the study area into different sub-regions based on water quality. The study identified sources of water contamination and classified the dominant water types in each zone. A risk assessment was conducted to evaluate the health risks associated with drinking water, with chloride identified as a potential risk factor. Principal component analysis was used to identify important parameters in water quality.
ENVIRONMENTAL MONITORING AND ASSESSMENT
(2022)
Article
Environmental Sciences
Jing Lu, Jiarong Gu, Jinyang Han, Jun Xu, Yi Liu, Gengmin Jiang, Yifeng Zhang
Summary: This study assessed the water quality of the Yangtze River using PCA, HCA, and WQI, and identified the key parameters influencing water quality. The results showed that most monitoring stations had good water quality, with a gradual decrease from upstream to downstream.
Article
Biodiversity Conservation
Shuang Gan, Min Zhang, Kaining Yu, Yahong Zhou, Baizhong Yan
Summary: This study evaluated the groundwater quality in Huangbizhuang town, an important water source for Shijiazhuang and Beijing, China. The overall water quality was found to be good, suitable for drinking and irrigation. The study compared two weighting methods and found that the principal component analysis weighting method is more objective and suitable for the study area. Multivariate statistical analysis showed that groundwater pollution is caused by both point source and non-point source pollution.
HUMAN AND ECOLOGICAL RISK ASSESSMENT
(2023)
Article
Environmental Sciences
Mario Maiolo, Daniela Pantusa
Summary: The vulnerability of drinking water supply systems is influenced by factors such as failures, security loss, man-made threats, and changes in supply-water quality. Monitoring and transparency on water availability and quality are increasingly important. An analysis of water quality monitoring data was conducted using multivariate techniques to identify influential parameters and clusters.
Article
Engineering, Environmental
Ivan Radelyuk, Kamshat Tussupova, Magnus Persson, Kulshat Zhapargazinova, Madeniyet Yelubay
Summary: This paper evaluates the groundwater contamination caused by petrochemical enterprises in Kazakhstan and identifies the factors contributing to the pollution. The study shows significant exceedance of pollutants in groundwater and highlights the influence of host geology and effluents from the petrochemical industry on groundwater quality.
ENVIRONMENTAL GEOCHEMISTRY AND HEALTH
(2021)
Article
Environmental Sciences
Sanat Das, Rajib Sarkar
Summary: This study focused on the spatiotemporal trends of water quality in a section of the Bhagirathi-Hugli River, West Bengal, using geospatial technology and integrated statistical methods. The results showed that water quality is significantly influenced by seasonal and anthropogenic factors, leading to a certain degree of pollution, and rural areas have better water quality than industrial and urban areas.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Environmental Sciences
Istvan Gabor Hatvani, Daniel Erdelyi, Polona Vreca, Zoltan Kern
Article
Ecology
Istvan Gabor Hatvani, Vinicius Deganutti de Barros, Peter Tanos, Jozsef Kovacs, Ilona Szekely Kovacs, Adrienne Clement
ECOLOGICAL ENGINEERING
(2020)
Article
Environmental Sciences
Minas Garamhegyi, Istvan Gabor Hatvani, Jozsef Szalai, Jozsef Kovacs
Article
Environmental Sciences
Zoltan Kern, Istvan Gabor Hatvani, Gyorgy Czuppon, Istvan Forizs, Daniel Erdelyi, Tjasa Kanduc, Laszlo Palcsu, Polona Vreca
Article
Meteorology & Atmospheric Sciences
Daniel Topal, Istvan Gabor Hatvani, Zoltan Kern
THEORETICAL AND APPLIED CLIMATOLOGY
(2020)
Article
Environmental Sciences
Judit Alexandra Szabo, Csaba Centeri, Boglarka Keller, Istvan Gabor Hatvani, Zoltan Szalai, Endre Dobos, Gergely Jakab
Article
Environmental Sciences
Norbert Magyar, Istvan Gabor Hatvani, Miklos Arato, Balazs Trasy, Alfred Paul Blaschke, Jozsef Kovacs
Summary: Shallow groundwater, a primary source of fresh water, is endangered due to urbanization and increased demand for irrigation. The study found that dynamic factor models accurately estimated water levels, with evapotranspiration and precipitation identified as the main driving factors. The spatial distribution of these factors and their correlation with fluctuations in water level were also determined.
Article
Environmental Sciences
Kamilla Modrovits, Andras Csepregi, Ilona Kovacsne Szekely, Istvan Gabor Hatvani, Jozsef Kovacs
Summary: The study focuses on predicting karst water level fluctuations using trend estimation and deterministic modeling. After mining activities ceased, natural recharge exceeded dewatering, leading the system to return to its original state, but also raising some economic and technical engineering challenges.
Article
Geography, Physical
Istvan Gabor Hatvani, Peter Tanos, Manfred Mudelsee, Zoltan Kern
Summary: The detection of periodic fluctuations in paleoclimate data is crucial for understanding past and future climate changes, despite challenges such as chronological uncertainty and variable temporal resolution. Advances in statistical tools have enabled better analysis and consideration of these complexities, leading to improved detectability of periodic signals.
QUATERNARY SCIENCE REVIEWS
(2022)
Article
Environmental Sciences
Istvan Gabor Hatvani, Daniel Topal, Eric Ruggieri, Zoltan Kern
Summary: Ice core records from the Greenland Ice Sheet show that atmospheric circulation has had a consistent influence on surface changes over the past millennium, as indicated by the presence of synchronous changepoints.
Article
Plant Sciences
Zoltan Kern, Adam Kimak, Istvan Gabor Hatvani, Daniela Maria Llanos Campana, Markus Leuenberger
Summary: Stable isotope approaches are widely used in plant science, and this study focused on the analysis of alpha-cellulose content in leaf tissues of different tree species. The results showed variations in cellulose content and duration of the juvenile phase among different species, and the veins had significantly higher alpha-cellulose content than blade tissues. The study also provided a guide for the amount of sample material required for stable isotope analysis.
Article
Mathematics, Interdisciplinary Applications
Daniel Erdelyi, Zoltan Kern, Tamas Nyitrai, Istvan Gabor Hatvani
Summary: Stable isotopes of hydrogen and oxygen are important natural tracers with various environmental applications. In this study, a classical random forest (RF) and two variants were used to predict the spatial variability of precipitation stable oxygen isotope values across Europe. RFsp yielded the smallest mean absolute error (1.345%) and highest Lin's concordance correlation coefficient (0.987) when using the merged dataset.
GEM-INTERNATIONAL JOURNAL ON GEOMATHEMATICS
(2023)
Article
Water Resources
Csilla Kiraly, Dora Cseresznyes, Norbert Magyar, Istvan Gabor Hatvani, Tamas Egedy, Zsuzsanna Szabo-Krausz, Beatrix Udvardi, Gergely Jakab, Gyorgy Varga, Zoltan Szalai
Summary: In this study, the connection between mass movements and meteorological conditions was explored using new statistical methods. The periodicity of the Danube's water level and variations in precipitation were analyzed. The results showed that only two mass movements were influenced by hydrological conditions, while other factors such as human activity and geochemical changes may have played a role.
Article
Mathematics, Interdisciplinary Applications
Nikoletta Rozgonyi-Boissinot, Ildiko Buocz, Istvan Gabor Hatvani, Akos Torok
Summary: The study aims to facilitate the future automatic detection of crucial characteristics in shear stress versus shear displacement curves using modern statistical tools, to replace visual/analogue determination methods.
GEM-INTERNATIONAL JOURNAL ON GEOMATHEMATICS
(2021)
Review
Geosciences, Multidisciplinary
Zoltan Kern, Attila Demeny, Aurel Persoiu, Istvan Gabor Hatvani
Article
Ecology
Alexander M. Cancelli, Frank A. P. C. Gobas
Summary: A mechanistic model was developed to assess the removal efficiency of pollutants in a wetland system, particularly in oil sands process-affected water (OSPW). The model simulated wetland mechanisms of chemical removal and showed that sustained wetland treatment is feasible. It is a helpful tool to evaluate the feasibility of treatment systems and to assess trade-offs in wetland design and operation.
ECOLOGICAL ENGINEERING
(2024)
Article
Ecology
Prakash Singh Thapa, Hiromu Daimaru, Seiji Yanai
Summary: This study assessed the vegetation recovery and erosion condition in a landslide area in central Japan. The results show that the upper slope, where reforestation activities were implemented, has seen significant vegetation recovery and no significant erosion, while the lower slope lacks vegetation and has experienced continued erosion.
ECOLOGICAL ENGINEERING
(2024)
Article
Ecology
Mike Jerauld, Forrest Dierberg, Thomas DeBusk, Scott Jackson, Kevin Grace, John Juston
Summary: The Everglades Stormwater Treatment Areas (STAs) are constructed wetlands built to remove phosphorus (P) from agricultural and urban runoff in support of Everglades restoration. Research shows that the levels of calcium (Ca) and alkalinity (Alk) have an impact on phosphorus removal in these wetlands.
ECOLOGICAL ENGINEERING
(2024)
Article
Ecology
Kalindhi Larios, Stefan Gerber, Rafael Munoz-Carpena, Patrick Inglett, K. Ramesh Reddy, Michael Chimney
Summary: This study modeled the phosphorus biogeochemical dynamics in one of the best performing Everglades treatment wetlands and found that the complexity of the hydrological system significantly affected the simulated water column P concentration. The modeling tool developed in this study can guide future data collection and optimization efforts for treatment wetlands in the Everglades.
ECOLOGICAL ENGINEERING
(2024)
Article
Ecology
Jing Hu, Benjamin Baiser, R. Thomas James, K. Ramesh Reddy
Summary: This study examined the long-term phosphorus retention in Stormwater Treatment Areas (STAs) and identified the factors influencing their performance. The results showed that the operational performance of STAs improved over time. There were notable differences among individual STAs, with the co-precipitation of phosphorus with calcium playing a critical role in one of the STAs. This highlights the complexity of phosphorus removal in STAs and the need for site-specific management strategies.
ECOLOGICAL ENGINEERING
(2024)
Article
Ecology
Odi Villapando, K. R. Reddy, J. King
Summary: The biogeochemical response to different flow conditions within two parallel flow-ways in Everglades Stormwater Treatment Area (STA)-2 was studied. It was found that there was a gradual decrease in the total phosphorus (TP) concentration from inflow to outflow for both emergent aquatic vegetation (EAV) and submerged aquatic vegetation (SAV) dominated systems, with EAV showing a higher reduction rate. Significant increase in TP concentration was observed in the SAV system under no flow condition, possibly due to the production of particulate phosphorus (PP) through various mechanisms.
ECOLOGICAL ENGINEERING
(2024)