Article
Engineering, Civil
Yao Cheng, Fengxia Zhao, Jinkun Wu, Pengyang Gao, Yuchun Wang, Jin Wang
Summary: The cascade hydropower development in the Lancang River Basin has a significant impact on the river ecosystem. This study used the DGT technique to analyze the bioavailability and spatial distribution of arsenic in the sediments of Xiaowan and Nuozhadu cascade dams. The results showed that the development of cascade reservoirs had a great impact on the bioavailability of arsenic, and the migration mechanism of arsenic was related to iron and manganese.
JOURNAL OF HYDROLOGY
(2022)
Article
Limnology
Qiuwen Chen, Yuchen Chen, Jun Yang, Stephen C. Maberly, Jianyun Zhang, Jinren Ni, Gangsheng Wang, Daniele Tonina, Lin Xiao, Honghai Ma
Summary: This study found that water temperature, rather than the presence of dams, is the main factor influencing the geographical distribution of bacterial communities in cascade reservoirs. There are significant spatial differences in sediment bacterial communities within a reservoir, potentially forming hotspots for biogeochemical cycling. Unlike in deep lakes and deep single reservoirs, the bacterioplankton community composition in deep cascade reservoirs does not have distinctly layered features due to density-induced underwater currents and convection.
LIMNOLOGY AND OCEANOGRAPHY
(2021)
Article
Environmental Sciences
Anirban Akhand, Kenta Watanabe, Abhra Chanda, Tatsuki Tokoro, Kunal Chakraborty, Hirotada Moki, Toko Tanaya, Jayashree Ghosh, Tomohiro Kuwae
Summary: Mangrove, seagrass, and coral habitats in tropical and subtropical regions are interconnected and have varying effects on CO2 dynamics and air-water fluxes. Different habitats contribute differently to atmospheric CO2, and biogeochemical processes along coastal areas play a key role in carbon cycling.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Wanfa Wang, Si-Liang Li, Jun Zhong, Lichun Wang, Hong Yang, Huayun Xiao, Cong-Qiang Liu
Summary: Research on eight karst reservoirs on the Wujiang River in Southwest China revealed that CO2 emissions from reservoirs are influenced by factors such as hydraulic retention time and thermal stratification intensity. The CO2 flux from reservoirs is controlled by multiple processes, with an exponential relationship observed between CO2 flux and δC-13(CO2).
ENVIRONMENTAL RESEARCH LETTERS
(2021)
Article
Engineering, Civil
Lu Chen, Linsong Ge, Dangwei Wang, Wenjie Zhong, Ting Zhan, Anjun Deng
Summary: Sediment deposition in rivers has a negative impact on reservoirs and socioeconomic development. Studying the joint operation of cascade reservoirs is crucial for their longevity. This paper proposes a scientific approach to optimize water-sediment operation in cascade reservoirs, taking multiple objectives into consideration.
JOURNAL OF HYDROLOGY
(2022)
Article
Geosciences, Multidisciplinary
Hao-Chen Yan, Xiao-Feng Zhang, Quan-Xi Xu
Summary: Anthropogenic interventions in large river basins are causing unprecedented changes in earth surface processes, particularly evident in the upper reach of the Yangtze River Basin. The construction of mega dams and reservoirs has led to significant trapping of sediment, affecting spatial and temporal patterns of sediment flux and sedimentation. These impacts are complex and require detailed study to understand the trapping efficiency and downstream consequences of these interventions.
Article
Environmental Sciences
Yu Wei, Hao Yan, Zaihua Liu, Cuihong Han, Song Ma, Hailong Sun, Qian Bao
Summary: The change in hydrodynamics by damming promotes the generation and burial of autochthonous organic carbon, which is overlooked in current global carbon budgeting. This study examined the settling organic matter in three subtropical karst reservoirs in China and found that 30-60% of the settling organic carbon is autochthonous. The proportion of autochthonous organic carbon is inversely correlated with its settling flux. The ballast effect of biogenic silica and lithogenic materials is found to be the primary factor governing the settling flux of autochthonous organic carbon.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Wen-jing Niu, Zhong-kai Feng, Zhi-qiang Jiang, Sen Wang, Shuai Liu, Wei Guo, Zhen-guo Song
Summary: An enhanced harmony search (EHS) method is developed to address the issues of standard harmony search, improving search ability and convergence rate. Applied to numerical optimization and multireservoir operation problems, EHS outperforms existing methods in various cases, showing better results.
ENVIRONMENTAL RESEARCH LETTERS
(2021)
Article
Water Resources
You Xu, Xiaojuan Guo, Yong Dan, Zhengjian Yang, Jun Ma, Defu Liu, Yaqian Xu
Summary: Water temperature is an important factor in river ecosystems, and dam construction may disrupt the continuity of water temperature. Research shows that stratified reservoirs have a large discontinuity in water temperature, highlighting the need for measures to improve temperature continuity in reservoirs.
HYDROLOGICAL PROCESSES
(2021)
Article
Environmental Sciences
Zorana Kljakovic-Gaspic, Ankica Sekovanic, Tatjana Orct, Dora Sebescen, Elena Klasicek, Davor Zanella
Summary: The anthropogenic impact on the aquatic environment of the Rasa River was investigated by analyzing metal(loid)s in water, sediment, and fish using ICP-MS. Results showed that the water had low concentrations of inorganic constituents, while sediments mainly reflected the geological background. Although sediment quality conditions could pose a threat to benthic organisms, the levels of contaminants in fish muscles were below regulatory limits, indicating a low contamination status of the Rasa River.
Article
Environmental Sciences
JoAnn M. Burkholder, Carol A. Kinder, Elle H. Allen
Summary: Reservoirs are valuable sources of drinking water worldwide, but their limnology and trophic status are poorly known in many regions. This study characterized 14 drinking water reservoirs in the southeastern USA and found that most of them were eutrophic and experienced hypoxia throughout the summers. The study suggests that the eutrophication trajectory of reservoirs should be used as an indicator of ecosystem health and water quality to develop more protective management and policy actions.
Article
Environmental Sciences
Jinhua Zhang, Jiajia Ma, Zehong Zhang, Baidong He, Yue Zhang, Linhui Su, Baohua Wang, Jinzhuo Shao, Yiping Tai, Xiaomeng Zhang, Hong Huang, Yang Yang, Yunv Dai
Summary: In this study on the restoration of the Shahe River in subtropical China, researchers used the benthic index of biological integrity (B-IBI) to assess the ecological responses to river restoration. They found that the restoration led to changes in the macrobenthos community structure, with an increase in the number of species and the emergence of pollution-sensitive species. Molluscs showed widespread recovery, and the overall health of the river improved.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Geosciences, Multidisciplinary
Jungpyo Hong, Heejun Kim, Wonhee Lee, Jeongyeon Yu, Tobias P. Fischer, Naoto Takahata, Yuji Sano, Hyunwoo Lee
Summary: Carbon dioxide is a main component of greenhouse gases and its emissions are of great concern. This study focuses on CO2 emissions from faults, which have high permeability and play a significant role in sedimentary basins and soil formation.
Article
Engineering, Civil
Anan Guo, Dong Chen, Li He, Yuming Peng, Guanglei Duan
Summary: The impoundment of cascade mega-reservoirs in the upper Yangtze River has had profound and accumulative impacts on the lower reaches, leading to a significant decrease in sediment load and a change in the runoff-sediment relationship. This study analyzed data from 1990 to 2021 to examine the changes in sediment suspension in the Jingjiang reach, approximately 100 km below the Three Gorges Dam. The impacts of cascade mega-reservoirs were evaluated using three parameters: inflow water discharge, sediment concentration released to the Three Gorges Reservoir, and operating water levels in front of the dam. The relative importance of these parameters in determining wash-load concentrations was assessed using a random forest model.
JOURNAL OF HYDROLOGY
(2023)
Article
Green & Sustainable Science & Technology
Xiao Li, Pan Liu, Yibo Wang, Zhikai Yang, Yu Gong, Rihui An, Kangdi Huang, Yan Wen
Summary: This study focuses on deriving operating rule curves to maximize revenue by integrating reservoir operations and a spot market. The derived rule curves effectively increase hydropower generation and revenue, reduce spill water, and expand the operational zone.
Article
Environmental Sciences
Qiong Han, Baoli Wang, Cong-Qiang Liu, Fushun Wang, Xi Peng, Xiao-Long Liu
SCIENCE OF THE TOTAL ENVIRONMENT
(2018)
Article
Limnology
Fu-Jun Yue, Si-Liang Li, Cong-Qiang Liu, Khan M. G. Mostofa, Naohiro Yoshida, Sakae Toyoda, Shi-Lu Wang, Shohei Hattori, Xiao-Long Liu
Article
Environmental Sciences
Jinke Liu, Guilin Han, Xiaolong Liu, Man Liu, Chao Song, Qian Zhang, Kunhua Yang, Xiaoqiang Li
INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH
(2019)
Article
Environmental Sciences
Jinke Liu, Guilin Han, Xiaolong Liu, Kunhua Yang, Xiaoqiang Li, Man Liu
JOURNAL OF COASTAL RESEARCH
(2019)
Article
Environmental Sciences
Jinke Liu, Guilin Han, Xiaolong Liu, Man Liu, Chao Song, Kunhua Yang, Xiaoqiang Li, Qian Zhang
Article
Environmental Sciences
Beibei Hu, Dongqi Wang, Weiqing Meng, Jun Zhou, Zongbin Sun, Xiaolong Liu
JOURNAL OF SOILS AND SEDIMENTS
(2020)
Article
Environmental Sciences
Sai-Nan Chen, Fu-Jun Yue, Xiao-Long Liu, Jun Zhong, Yuan-Bi Yi, Wan-Fa Wang, Yulin Qi, Hua-Yun Xiao, Si-Liang Li
Summary: The study in a karst watershed in southwest China showed that nitrogen concentration was higher in summer in the cascade reservoir system, with nitrification being the dominant conversion process in the water system. Fertilizer application significantly influenced nitrate concentration in the karst cascade reservoirs.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Environmental Sciences
Xiao-Long Liu, Guilin Han, Jie Zeng, Man Liu, Xiao-Qiang Li, Pascal Boeckx
Summary: This study highlighted the importance of identifying nitrate sources and transformations in agricultural watersheds to protect water sources. The study employed chemical and dual isotopic compositions of nitrate to trace sources and processes, estimating the proportional contribution of different nitrate sources. Results showed that NH4+ concentrations were significantly higher than NO3- in certain river sections during the wet season, indicating enhanced runoff processes and fertilized NH4+ leaching. Additionally, manure and sewage were identified as dominant nitrate sources in certain river sections.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Green & Sustainable Science & Technology
Xiaolong Liu, Guilin Han, Jie Zeng, Jinke Liu, Xiaoqiang Li, Pascal Boeckx
Summary: This study quantified and identified nitrate sources and processes in a subtropical river impacted by dam impoundment and urbanization. It found that nitrate in agriculture and forest land mainly comes from chemical fertilizer and soil nitrogen, while manure and sewage are the main riverine sources. Nitrification was dominant, especially in urban areas, but manure and sewage inputs greatly influenced the process. Additionally, progressive denitrification was observed in the upper reaches due to dam impoundment for hydropower generation.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Environmental Sciences
Yongmei Hou, Xiaolong Liu, Sainan Chen, Jie Ren, Li Bai, Jun Li, Yongbo Gu, Lai Wei
Summary: This study investigated nitrogen species and isotopes in sediment of a deep reservoir in Southwest China, revealing significant differences in nitrogen composition and isotopes between thermal stratification and non-thermal stratification periods. The results suggest that sediment biogeochemical processes and transportation are linked to variations in water temperature and dissolved oxygen influenced by thermal stratification.
Article
Environmental Sciences
Lai Wei, Xiaolong Liu, Caiqing Qin, Wencong Xing, Yongbo Gu, Xiaoxia Wang, Li Bai, Jun Li
Summary: Incubation experiments on a typical cornfield soil in the karst area of the Wujiang River watershed in Southwest China revealed that increased soil moisture and fertilizer application significantly stimulated N2O emissions, with the highest flux observed at 70% water-filled pore space due to nitrifier denitrification and denitrification processes. This study provides valuable insights for estimating N2O emissions in cropland soil in karst areas and improving soil nitrogen assessment and management in agricultural land within karst watersheds.
Article
Environmental Sciences
Yongmei Hou, Xiaolong Liu, Guilin Han, Li Bai, Jun Li, Yusi Wang
Summary: High levels of CO2 emissions have been observed in sewage and drainage river waters, sparking global concerns. This study investigates the associations among nitrogen pollution, urbanization, and CO2 emissions in sewage-draining river networks, and finds that CO2 levels in these rivers are approximately 4 times higher than the global average.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH
(2022)
Article
Environmental Sciences
Wencong Xing, Lai Wei, Wenmin Ma, Jun Li, Xiaolong Liu, Jian Hu, Xiaoxia Wang
Summary: Due to natural and anthropogenic activities, the water environment of the Duilong Qu watershed on the Tibetan Plateau has been affected, resulting in changes in water chemistry and heavy metal concentrations. The study shows that carbonate rock weathering and geothermal water are the main factors controlling water solute and heavy metal sources. The concentrations of heavy metals in this area meet international and national standards. However, future attention should be given to heavy metal pollution.
Article
Environmental Sciences
Jie Ren, Guilin Han, Xiaolong Liu
Summary: The purpose of this study was to investigate nitrogen transformation at the sediment-water interface (SWI) and the factors influencing it. Sediment cores were collected from DFR and pore water samples were obtained. Different forms of nitrogen were measured, and stable isotopes and C/N ratios were used to determine the sources of organic nitrogen. It was found that dissolved oxygen (DO) was the primary factor controlling nitrogen transformation at SWI, and mineralization and nitrification were the dominant processes. The estimated endogenous diffusion fluxes of NH4+-N from sediment were higher than expected.
JOURNAL OF SOILS AND SEDIMENTS
(2023)
Article
Chemistry, Multidisciplinary
Jie Ren, Guilin Han, Xiaolong Liu, Jinke Liu, Xi Gao
Summary: Ecological water replenishment projects have been implemented in the Yongding River Basin since 2019, aiming to balance regional ecology and social development. A study was conducted to assess the water chemistry and quality of the Yongding River under the ecological water replenishment. The study found that anthropogenic activities, particularly urban domestic sewage inputs, had a significant impact on the concentrations of riverine solutes. The implementation of ecological water replenishment projects improved the ecological function and irrigation water quality of the Yongding River.
ACS EARTH AND SPACE CHEMISTRY
(2023)
Article
Environmental Sciences
Muhammad Waqas, Majid Nazeer, Man Sing Wong, Wu Shaolin, Li Hon, Joon Heo
Summary: The socio-economic restriction measures implemented in the United States have significantly reduced nitrogen dioxide (NO2) emissions. The study highlights the impact of factors such as human mobility, population density, income, climate, and stationary sources on the reduction of NO2 at different stations. The research emphasizes the scientific impacts of the NO2 reduction and income inequality revealed by the pandemic on air quality and health disparities.
ATMOSPHERIC ENVIRONMENT
(2024)
Article
Environmental Sciences
Guorui Zhi, Jinhong Du, Aizhong Chen, Wenjing Jin, Na Ying, Zhihui Huang, Peng Xu, Di Wang, Jinghua Ma, Yuzhe Zhang, Jiabao Qu, Hao Zhang, Li Yang, Zhanyun Ma, Yanjun Ren, Hongyan Dang, Jianglong Cui, Pengchuan Lin, Zhuoshi He, Jinmin Zhao, Shuo Qi, Weiqi Zhang, Wenjuan Zhao, Yingxin Li, Qian Liu, Chen Zhao, Yi Tang, Peng Wei, Jingxu Wang, Zhen Song, Yao Kong, Xiangzhe Zhu, Yi Shen, Tianning Zhang, Yangxi Chu, Xinmin Zhang, Jiafeng Fu, Qingxian Gao, Jingnan Hu, Zhigang Xue
Summary: An comprehensive emission inventory for China in 2019, which includes both air pollutants and greenhouse gases, was developed in this study. The inventory utilizes existing frameworks and data to provide comparable emissions data and demonstrates the relationship between emissions and economic development.
ATMOSPHERIC ENVIRONMENT
(2024)
Article
Environmental Sciences
I-Ting Ku, Yong Zhou, Arsineh Hecobian, Katherine Benedict, Brent Buck, Emily Lachenmayer, Bryan Terry, Morgan Frazier, Jie Zhang, Da Pan, Lena Low, Amy Sullivan, Jeffrey L. Collett Jr
Summary: Unconventional oil and natural gas development (UOGD) in the United States has expanded rapidly in recent decades, raising concerns about its impact on air quality. This study conducted extensive air monitoring during the development of several large well pads in Broomfield, Colorado, providing a unique opportunity to examine changes in local air toxics and VOC concentrations during well drilling and completions and production. The study identified significant increases in VOC concentrations during drilling operations, highlighting the importance of emissions from synthetic drilling mud. The findings suggest opportunities to mitigate emissions during UOGD operations.
ATMOSPHERIC ENVIRONMENT
(2024)
Article
Environmental Sciences
Puji Lestari, Akbar R. Tasrifani, Wiranda I. Suri, Martin J. Wooster, Mark J. Grosvenor, Yusuke Fujii, Vissia Ardiyani, Elisa Carboni, Gareth Thomas
Summary: This study developed field emission factors for various pollutants in peatland fires and estimated the total emissions. Gas samples were collected using an analyzer, while particulate samples were collected using air samplers. The study found significant emissions of CO2, CO, PM2.5, carbon aerosols, water-soluble ions, and elements from the fires in Central Kalimantan, Indonesia in 2019.
ATMOSPHERIC ENVIRONMENT
(2024)
Article
Environmental Sciences
Ligang Li, Yuyu Chen, Lu Fan, Dong Sun, Hu He, Yongshou Dai, Yong Wan, Fangfang Chen
Summary: A high-precision retrieval method based on a deep convolutional neural network and satellite remote sensing data is proposed to obtain accurate methane vertical profiles.
ATMOSPHERIC ENVIRONMENT
(2024)
Article
Environmental Sciences
Hyung Joo Lee, Toshihiro Kuwayama, Michael Fitzgibbon
Summary: This study investigated the changes in nitrogen dioxide (NO2) air pollution levels and their disparities in California, U.S. during the pandemic of coronavirus disease 2019 (COVID-19). The results showed a decrease in NO2 concentrations, especially in urban and high-traffic areas. However, socially vulnerable populations still experienced higher levels of NO2 exposure. The study suggests that reducing NO2 disparities, particularly racial inequity, can be achieved through continued regulatory actions targeting traffic-related NOx emissions.
ATMOSPHERIC ENVIRONMENT
(2024)
Article
Environmental Sciences
Maria Chiara Pietrogrande, Beatrice Biffi, Cristina Colombi, Eleonora Cuccia, Umberto Dal Santo, Luisa Romanato
Summary: This study investigates the chemical composition and oxidative potential of PM10 particles in the Po Valley, Italy, and demonstrates the impact of high levels of atmosphere ammonia. The rural area had significantly higher ammonia concentrations compared to the urban site, resulting in higher levels of secondary inorganic aerosol. Although the SIA components did not contribute significantly to the PM10 oxidative reactivity, they were correlated with the oxidative potential measurements. This suggests that the contribution of SIA to PM oxidative toxicity cannot be ignored.
ATMOSPHERIC ENVIRONMENT
(2024)
Article
Environmental Sciences
Natalie Allen, Jan Gacnik, Sarrah M. Dunham-Cheatham, Mae Sexauer Gustin
Summary: Accurate measurement of atmospheric reactive mercury is challenging due to its reactivity and low concentrations. The University of Nevada, Reno Reactive Mercury Active System (RMAS) has been shown to be more accurate than the industry standard, but has limitations including long time resolution and sampling biases. Increasing the sampling flow rate negatively affected RM concentrations, but did not impact the chemical composition of RM captured on membranes.
ATMOSPHERIC ENVIRONMENT
(2024)
Article
Environmental Sciences
Chin-Yu Hsu, Wei-Ting Hsu, Ching-Yi Mou, Pei-Yi Wong, Chih-Da Wu, Yu-Cheng Chen
Summary: This study estimated the daily exposure concentrations of PM2.5 for elderly individuals residing in different regions of Taiwan using land use regression with machine learning (LUR_ML) and microenvironmental exposure (ME) models. The accuracy of the models varied across regions, with the ME models exhibiting higher predictions and lower biases. The use of region-specific microenvironmental measurements in the ME model showed potential for accurate prediction of personal PM2.5 exposure.
ATMOSPHERIC ENVIRONMENT
(2024)
Article
Environmental Sciences
Xiaohan Si, Kerrie Mengersen, Chuchu Ye, Wenbiao Hu
Summary: This study found that there is an interactive effect between air pollutants and weather factors, which significantly affects influenza transmission. Future research should consider the interactive effects between pollutants and temperature or humidity to evaluate the environment-influenza association.
ATMOSPHERIC ENVIRONMENT
(2024)
Article
Environmental Sciences
Luxi Xu, Ruijun Xu, Yunshao Ye, Rui Wang, Jing Wei, Chunxiang Shi, Qiaoxuan Lin, Ziquan Lv, Suli Huang, Qi Tian, Yuewei Liu
Summary: This study aimed to evaluate the impact of ambient air pollution on hospital admissions for angina. The results showed that exposure to ambient particulate matter, sulfur dioxide, nitrogen dioxide, carbon monoxide, and ozone are associated with an increased risk of hospital admissions for angina. The association with nitrogen dioxide exposure was found to be the strongest.
ATMOSPHERIC ENVIRONMENT
(2024)
Article
Environmental Sciences
Xinyu Yu, Man Sing Wong, Majid Nazeer, Zhengqiang Li, Coco Yin Tung Kwok
Summary: This study proposes a novel method to address the challenge of missing values in satellite-derived AOD products and creates a comprehensive daily AOD dataset for the Guangdong-Hong Kong-Macao Greater Bay Area. By reconstructing missing values and developing a new model, the derived dataset outperforms existing products and agrees well with ground-based observations. Additionally, the dataset exhibits consistent temporal patterns and more spatial details.
ATMOSPHERIC ENVIRONMENT
(2024)
Article
Environmental Sciences
Yidan Zhang, Yifan Xu, Bo Peng, Wu Chen, Xiaoyu Cui, Tianle Zhang, Xi Chen, Yuan Yao, Mingjin Wang, Junyi Liu, Mei Zheng, Tong Zhu
Summary: This study developed a sensitive method to measure the metallic components of atmospheric fine particulate matter (PM2.5) and compared the results with different analysis methods. The concentrations of metallic components in personal PM2.5 samples were found to be significantly different from corresponding fixed-site samples. Personal sampling can reduce exposure misclassifications, and measuring metallic components is useful for exploring health risks and identifying sources of PM2.5.
ATMOSPHERIC ENVIRONMENT
(2024)
Review
Environmental Sciences
Jamie Leonard, Lea Ann El Rassi, Mona Abdul Samad, Samantha Prehn, Sanjay K. Mohanty
Summary: Increasing concentrations of microplastics in the Earth's atmosphere could have adverse effects on ecosystems and human health. The deposition rate of airborne microplastics is influenced by both land use and climate, and a global analysis suggests that climate may have a greater impact on the concentration and deposition rate of microplastics than land use.
ATMOSPHERIC ENVIRONMENT
(2024)
Article
Environmental Sciences
Tian Zhou, Xiaowen Zhou, Zining Yang, Carmen Cordoba-Jabonero, Yufei Wang, Zhongwei Huang, Pengbo Da, Qiju Luo, Zhijuan Zhang, Jinsen Shi, Jianrong Bi, Hocine Alikhodja
Summary: This study investigated the long-range transport and effects of North African and Middle Eastern dust in East Asia using lidar observations and model simulations. The results showed that the dust originated from multiple sources and had a long transport time. The vertical distribution of the dust was found to be crucial for assessing its impacts.
ATMOSPHERIC ENVIRONMENT
(2024)