Article
Engineering, Environmental
Annette B. G. Janssen, Bram Droppers, Xiangzhen Kong, Sven Teurlincx, Yindong Tong, Carolien Kroeze
Summary: Chinese lakes, including ponds and reservoirs, are facing increasing threats from algal blooms, with unique lake characteristics influencing vulnerability. Eastern lakes in China, typically warmer and deeper, are more vulnerable to algal blooms, especially due to higher pollution levels. This assessment provides valuable information for policymakers to address regions most at risk of algal blooms.
Article
Environmental Sciences
Brenda Lara D. S. Carneiro, Maria de Jesus D. Rocha, Mario U. G. Barros, Walt Disney Paulino, Iran E. Lima Neto
Summary: This study analyzed the dynamics of thermal stratification and dissolved oxygen (DO) in nineteen tropical semiarid reservoirs. Based on the Relative Water Column Stability coefficient and seasonal variations, two new equations for quantifying anoxia duration in the wet and dry seasons were proposed. The results showed that these equations outperformed the original equation developed for temperate lakes in accurately quantifying anoxic events in tropical semiarid reservoirs.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Engineering, Civil
Jicheng Zhong, Fanyan Yang, Min Zhang, Chuanzhe Sun, Shaoming Wang, Qiaoshen Chen, Hongwei Wang, Lei Zhang
Summary: This study investigated methane emissions and their temporal and spatial variations in three cascade reservoirs in northern China. The results showed that the three reservoirs were persistent sources of atmospheric methane during the ice-free period, with high spatial and temporal variability. The key drivers of methane emissions varied among the reservoirs.
JOURNAL OF HYDROLOGY
(2023)
Article
Environmental Sciences
Carmen Patino-Alonso, Fernando Espejo, Santiago Zazo, Jose-Luis Molina
Summary: This research aims to create, apply, and provide a novel indicator called Circularity Index for Dams/Reservoirs (CIDR) to evaluate the water circularity level in dual dam/reservoir systems. The method has been successfully implemented in 18 dam/reservoir systems managed by the Duero River Basin in Spain. The CIDR provides a single indicator value ranging from 0 to 55, with a higher value indicating better water circularity management.
Article
Biodiversity Conservation
Martino E. Malerba, David B. Lindenmayer, Ben C. Scheele, Pawel Waryszak, I. Noyan Yilmaz, Lukas Schuster, Peter I. Macreadie
Summary: Agricultural practices have created numerous artificial water bodies for the provision of water to livestock. Farm dams, among other freshwater ecosystems, have high greenhouse gas emissions due to fertilizer and manure run-off. This study conducted a large-scale experiment in Australia to investigate the effects of installing fences to exclude livestock on water quality and greenhouse gas emissions. The results showed that fenced farm dams had lower nutrient content, improved water quality, and reduced methane emissions compared to unfenced dams. Dissolved oxygen was found to be the most important factor influencing carbon fluxes.
GLOBAL CHANGE BIOLOGY
(2022)
Article
Environmental Sciences
Meijie Liu, Xiaoyu Lei, Yanyan Zhou, Jingsi Gao, Yun Zhou, Linlin Wang, Jia Zhu, Xian-zhong Mao
Summary: Reservoir water in densely populated humid subtropical areas like Shenzhen, China, is under threat of eutrophication and water supply shortage due to economic growth, population increase, and urbanization. This study focused on an upstream reservoir of Shenzhen, identifying tributaries as major contributors to nitrogen and phosphorus loads, and proposing mitigation measures such as improving flow and reducing nutrients in tributaries. The study suggests short-term management strategies combining hydrodynamic improvement and phosphorus reduction, while highlighting the potential danger of excessive nitrogen for future water safety.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Engineering, Civil
Pedro Wirley Castro, Carlos Alberto Mantilla
Summary: Dams interrupt river continuity, causing sediment accumulation and reducing reservoir water storage capacity. This paper studied common strategies for managing water resources and reservoir sedimentation, and successfully implemented and evaluated different sediment management strategies at various parts of the reservoir to reduce overflows and stabilize storage capacity.
WATER RESOURCES MANAGEMENT
(2021)
Article
Geosciences, Multidisciplinary
Jida Wang, Blake A. Walter, Fangfang Yao, Chunqiao Song, Meng Ding, Abu Sayeed Maroof, Jingying Zhu, Chenyu Fan, Jordan M. McAlister, Safat Sikder, Yongwei Sheng, George H. Allen, Jean-Francois Cretaux, Yoshihide Wada
Summary: Dams and reservoirs are widespread human-made infrastructures, but there is a lack of comprehensive spatial inventories for them. Existing datasets either focus on dam quantity and spatial coverage or detailed attributes for limited dams. To bridge this gap, researchers have introduced a new dataset, GeoDAR, which provides spatially explicit information for dams and reservoirs worldwide. This dataset is expected to have significant implications for hydrologic modeling, water resource management, ecosystem health, and energy planning.
EARTH SYSTEM SCIENCE DATA
(2022)
Article
Environmental Sciences
Yiyang Zhao, Suning Liu, Haiyun Shi
Summary: The study explores the correlations between reservoir characteristic factors (RCFs) of selected dams and related reservoirs and meteorological variables worldwide, finding complex relationships and differing impacts on different meteorological variables. The research shows that RCFs have a greater impact on precipitation than geographical factors, while evaporation is more sensitive to geographical factors.
ENVIRONMENTAL RESEARCH LETTERS
(2021)
Article
Environmental Sciences
Laura L. Lapham, Edward A. Hobbs, Jeremy M. Testa, Andrew Heyes, Melinda K. Forsyth, Casey Hodgkins, Curtis Szewczyk, Lora A. Harris
Summary: This study investigates the effect of engineered aeration on estuarine methane dynamics. The results show that bubble aeration increases air-water methane flux, while the addition of oxygen enhances methane oxidation. Regardless of aeration status, the estuary consistently releases methane to the atmosphere.
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2022)
Article
Environmental Sciences
Ahmad A. Tavakoly, Joseph L. Gutenson, James W. Lewis, Michael L. Follum, Adnan Rajib, William Clay LaHatte, Chase O. Hamilton
Summary: This study quantified the impact of dam regulations on streamflow and flood inundation by directly inserting operational daily flow release data at 175 dam locations into a streamflow simulation in the Mississippi River Basin. The inclusion of reservoir releases substantially improved the performance of the streamflow model, especially in the drier western region.
WATER RESOURCES RESEARCH
(2021)
Article
Geosciences, Multidisciplinary
Xinxin Wang, Xiangming Xiao, Yuanwei Qin, Jinwei Dong, Jihua Wu, Bo Li
Summary: Data and knowledge of surface water bodies are crucial for water resource management and sustainability. This study generated a dataset for large surface water bodies, dams, reservoirs, and lakes in China using satellite imagery. The dataset revealed that large surface water bodies accounted for a significant portion of China's total water area, with most dams and reservoirs concentrated in the south and east, and lakes predominantly found in the west and lower Yangtze River basin.
EARTH SYSTEM SCIENCE DATA
(2022)
Article
Multidisciplinary Sciences
Eduardo Dopico, Elena Arboleya, Sara Fernandez, Yaisel Borrell, Sonia Consuegra, Carlos Garcia de Leaniz, Gloria Lazaro, Cesar Rodriguez, Eva Garcia-Vazquez
Summary: River barriers, such as dams and reservoirs, have significant impacts on river dynamics and aquatic ecosystems. The importance of these barriers lies in the services they provide, such as water supply and low-carbon energy, which are increasingly critical due to climate change. A study conducted in two regions in Spain with contrasting climates and water security found that support for dams was higher in the drier region, where water shortages are more common. However, awareness of the impacts of dams was also higher in this region, indicating the need for involving local citizens in decision-making processes regarding water management.
SCIENTIFIC REPORTS
(2022)
Article
Marine & Freshwater Biology
Angela Maria Da Silva-Lehmkuhl, Saul Blanco, Denise C. Bicudo
Summary: We developed the Trophic Diatom Index for Reservoirs (TDIR) and compared it with other borrowed indices. TDIR showed good performance in classifying the trophic status of reservoirs.
Article
Environmental Sciences
Larissa Souza Passos, Eryka Costa de Almeida, Alexandre Villela, Adilson Nunes Fernandes, Marcelo Manzi Marinho, Levy Carvalho Gomes, Ernani Pinto
Summary: This study assessed the pollution extent of a crucial public water supply reservoir in southeastern Brazil. The findings revealed high concentrations of cyanobacteria and cyanotoxins in the reservoir, posing a significant ecological risk to aquatic life. Additionally, the analysis showed that levels of metals, metalloids, and fecal bacteria were below the maximum permitted limit according to Brazilian legislation.
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
(2022)
Article
Environmental Sciences
Suhas S. Shetye, Mandar Bandekar, Kuniyil Nandakumar, Siby Kurian, Mangesh Gauns, Shridhar Jawak, Anil Pratihary, S. Sai Elangovan, Bhagyashri R. Naik, Sethu Lakshmi, V. K. Aswathi
Summary: Anthropogenic activities release effluents containing nutrients and pathogenic bacteria that change coastal ecosystems. Sea foam, a type of marine pollution, was found in Goa, India, and it may have adverse effects on human health and the tourism industry.
ENVIRONMENTAL MONITORING AND ASSESSMENT
(2021)
Article
Environmental Sciences
Suhas S. Shetye, Siby Kurian, P. J. Vidya, Mangesh Gauns, Damodar M. Shenoy, S. G. Aparna, K. Nandakumar, Supriya G. Karapurkar
Summary: The study investigated the seasonal and temporal variation of total organic carbon (TOC) in the eastern Arabian Sea, revealing spatial changes in TOC concentrations in the top 100 meters during the North east and South west monsoons. High TOC levels were associated with Arabian Sea high saline waters advected from the Arabian Gulf, potentially influencing TOC enhancement in the region. Despite low primary productivity, excess TOC supported a high abundance of bacteria.
MARINE POLLUTION BULLETIN
(2021)
Article
Multidisciplinary Sciences
Balamurugan Sadaiappan, Chinnamani PrasannaKumar, V. Uthara Nambiar, Mahendran Subramanian, Manguesh U. Gauns
Summary: Copepods are the dominant zooplankton species, and it is important to study copepod-associated bacteriobiomes to understand specific bacterial taxa and their role in biogeochemical cycles. Machine learning models and PICRUSt2 analysis were used to analyze 16S rDNA gene sequences of CAB from five copepod genera, predicting important sub-OTUs in each. The CAB of Pleuromamma spp. had potential genes for methanogenesis and nitrogen fixation, while Temora spp. had genes for sulfate reduction and cyanocobalamin synthesis. Both Pleuromamma spp. and Temora spp. had potential genes involved in iron transport.
SCIENTIFIC REPORTS
(2021)
Article
Ecology
Priya Brata Das, Mangesh Gauns, Alexandra Stock, Syed Wajih Ahmad Naqvi
Summary: The study in the Arabian Sea revealed distinct characteristics in heterotrophic flagellate and ciliate communities in different physicochemical environments. Flagellates showed a preference for nitrate- and nitrite-rich zones, while ciliates were more diverse. Lower diversity was found in both ciliates and flagellates in estuarine waters.
Correction
Environmental Sciences
G. Narvenkar, S. W. A. Naqvi, S. Kurian, D. M. Shenoy, A. K. Pratihary, H. Naik, S. Patil, A. Sarkar, M. Gauns
ENVIRONMENTAL MONITORING AND ASSESSMENT
(2021)
Article
Oceanography
A. V. Chndrasekhararao, Siby Kurian, P. J. Vidya, Mangesh Gauns
Summary: The study investigated seasonal and inter-annual variations of phytoplankton characteristics in the NEAS using in situ data, highlighting the influence of SWM and NEM on phytoplankton productivity. Larger phytoplankton were supported during NEM while smaller groups were supported during late SWM, with a significant contribution of picoplankton in NEAS productivity, as influenced by ENSO and IOD. Comparison with US-JGOFS data showed comparable marker pigments over recent years but large inter-annual variability challenges long-term interpretation of phytoplankton composition changes. Long-term time-series observations in the Arabian Sea are recommended for understanding phytoplankton composition changes under climate change.
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
(2022)
Article
Environmental Sciences
Suhas S. Shetye, K. Nandakumar, Siby Kurian, Mangesh Gauns, Damodar M. Shenoy, Hema Naik, P. J. Vidya, Supriya G. Karapurkar
Summary: This study presents the seasonal and spatial distribution of total organic carbon (TOC) in the coastal waters of the eastern Arabian Sea. The results show higher TOC off Kochi compared to Goa and Mangalore, which may be due to stronger upwelling along the Kerala coast. Seasonal data indicate that high TOC is observed during specific periods, and the high concentrations during the fall inter monsoon (FIM) are a combination of various factors.
ENVIRONMENTAL MONITORING AND ASSESSMENT
(2022)
Review
Oceanography
Siby Kurian, Damodar M. Shenoy, V. P. Akhi, Pratima M. Kessarkar, Mangesh Gauns, Suhas S. Shetye, Muhamed Kabeer, Apsara P. Vijayan, Anand Methar, Supriya Karapurkar, A. V. Chndrasekhararao, S. W. A. Naqvi
Summary: Sediment traps were used to study particle sinking in the ocean water column. Data on fluxes, concentrations, and isotopic composition of carbon and nitrogen were collected from three traps deployed at different depths in the Bay of Bengal. The study highlights the seasonal and inter-annual variations in riverine suspended particulate material and emphasizes the need for continued time-series studies to understand long-term changes in component fluxes.
PROGRESS IN OCEANOGRAPHY
(2023)
Article
Environmental Sciences
Albertina B. Dias, Siby Kurian, Neethu T. Vijayan, Mangesh Gauns, Rahul Khichi, Anil K. Pratihary, Sidhesh G. Borker, Damodar M. Shenoy
Summary: Gonyaulax polygramma, a bloom-forming dinoflagellate, has been observed repeatedly in the southeastern Arabian Sea. In October 2021, a reddish-brown water patch off the coast of Kannur, India was identified as Gonyaulax polygramma using microscopy and pigments analysis. The bloom was dominated by Gonyaulax polygramma, with high concentrations of peridinin, chlorophyll-a, and dimethylsulfide. Satellite data was also used to detect and monitor the bloom. Due to its recurrent occurrence, regular satellite monitoring is proposed.
ENVIRONMENTAL MONITORING AND ASSESSMENT
(2023)
Article
Environmental Sciences
Bhagyashri R. Naik, Mangesh U. Gauns, Damodar M. Shenoy
Summary: The study reveals that the marine phytoplankton produces a dominant biogenic sulphur anti-greenhouse gas known as dimethylsulphide (DMSP). It shows that DMSP concentration increases during different growth stages and reaches its maximum during the stationary phase. Exposure to first light after a dark phase or early mornings leads to elevated levels of DMS.
MARINE POLLUTION BULLETIN
(2023)
Article
Environmental Sciences
Suhas Shetye, Anil Pratihary, Damodar Shenoy, Siby Kurian, Mangesh Gauns, Hema Uskaikar, Bhagyashri Naik, K. Nandakumar, Sidhesh Borker
Summary: Global oceans are experiencing changes in phytoplankton community composition due to various environmental stressors. The Arabian Sea is particularly affected, with harmful algal blooms replacing diatoms during winter. Recent studies have shown that dissolved silicate (DSi) limitation and changes in Silicon (Si)/Nitrogen (N) ratios are responsible for these changes. Rice husk, with its phytoliths, is shown to be an important source of bioavailable DSi for oceanic phytoplankton, increasing diatom abundance and reducing harmful algal blooms.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Review
Chemistry, Multidisciplinary
Balamurugan Sadaiappan, Preethiya Balakrishnan, C. R. Vishal, Neethu T. Vijayan, Mahendran Subramanian, Mangesh U. Gauns
Summary: Machine learning is a computer algorithm that predicts meaningful output or categorizes complex systems based on large amounts of data. In the field of chemical and biological oceanography, it is applied for predicting nitrogen levels, carbon dioxide pressure, detecting planktonic forms, classifying mammals based on acoustics, and predicting hypoxic conditions and harmful algal bloom events. It also helps in constructing databases for various species and better understanding the ocean's chemistry and biology.
Article
Environmental Sciences
S. Sai Elangovan, Mangesh U. Gauns
Summary: We conducted a study on the composition of microzooplankton communities in the waters off Candolim, Goa. We examined the communities throughout the year 2013 at four different stations. We recorded a total of 30 species belonging to 24 genera, including loricate ciliates, aloricate ciliates, heterotrophic dinoflagellates, and copepod nauplii. The abundance of microzooplankton varied spatially, with higher abundance in offshore stations and lower abundance in near-shore stations. The dominance of heterotrophic dinoflagellates was observed in the near-shore stations and during spring inter-monsoon in all coastal waters.
ENVIRONMENTAL MONITORING AND ASSESSMENT
(2023)
Article
Ecology
K. Nandakumar, Suhas S. Shetye, Siby Kurian, S. G. Aparna, Mangesh Gauns, Shrikant Dora
Summary: Understanding the physical properties and biological responses in the marine ecosystem is crucial for evaluating the ocean's role in anthropogenic carbon dioxide emissions. This study investigates the effects of southwest monsoon upwelling, oceanic fronts, and mesoscale eddies on nutrient supply and phytoplankton production in the Arabian Sea. The findings reveal distinct features and highlight the importance of these processes in shaping phytoplankton biomass in the region.
REGIONAL STUDIES IN MARINE SCIENCE
(2023)
Article
Environmental Sciences
Suhas Shetye, Sahina Gazi, Arundhathy Manglavil, Damodar Shenoy, Siby Kurian, Anil Pratihary, Gayatri Shirodkar, Rahul Mohan, Albertina Dias, Hema Naik, Mangesh Gauns, Kuniyil Nandakumar, Sidhesh Borker
Summary: The most abundant coccolithophore species found in the eastern Arabian Sea is Gephyrocapsa oceanica, which showed malformation in low pH waters during the Southwest Monsoon. Satellite data indicates a high abundance of coccolithophores in recent years, especially during warm El Nino years. This highlights the need for a better understanding of the fate of coccolithophores in high-CO2 and warmer oceans.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)