scholarly journals The response of Carlos Botelho (Lobo, Broa) reservoir to the passage of cold fronts as reflected by physical, chemical, and biological variables

2004 ◽  
Vol 64 (1) ◽  
pp. 177-186 ◽  
Author(s):  
J. G. Tundisi ◽  
T. Matsumura-Tundisi ◽  
J. D. Arantes Junior ◽  
J. E. M. Tundisi ◽  
N. F. Manzini ◽  
...  
Keyword(s):  
Management Strategies ◽  
Vertical Mixing ◽  
Continuous System ◽  
Cyanobacterial Blooms ◽  
Metropolitan Region ◽  
Climatological Data ◽  
Cold Fronts ◽  
Biological Variables ◽  
Physical Chemical ◽  
Shallow Reservoirs

This paper describes and discusses the impacts of the passage of cold fronts on the vertical structure of the Carlos Botelho (Lobo-Broa) Reservoir as demonstrated by changes in physical, chemical, and biological variables. The data were obtained with a continuous system measuring 9 variables in vertical profiles in the deepest point of the reservoir (12 m) coupled with climatological information and satellite images, during a 32-day period in July and August, 2003. During periods of incidence of cold fronts the reservoir presented vertical mixing. After the dissipation of the cold fronts a period of stability followed with thermal, chemical, and biological (chlorophyll-a) stratification. Climatological data obtained during the cold front passage showed lower air temperature, higher wind speed and lower solar radiation. The response of this reservoir can exemplify a generalized process in all shallow reservoirs in the Southeast Brazil and could have several implications for management, particularly in relation to the phytoplankton population dynamics and development of cyanobacterial blooms. Using this as a basis, a predictive model will be developed with the aim of advancing management strategies specially for the drinking water reservoirs of the Metropolitan Region of São Paulo.

The response of reservoirs of southeastern Brazil to the passage of cold fronts as reflected by physical, chemical and biological variables

2006 ◽  
Vol 29 (4) ◽  
pp. 2124-2128
Author(s):  
J.G. Tundisi ◽  
N.Y. Sebastien ◽  
T. Matsumura-Tundisi ◽  
J.E.M. Tundisi ◽  
N.F. Manzini
Keyword(s):  
Southeastern Brazil ◽  
Cold Fronts ◽  
Biological Variables ◽  
Physical Chemical

Toxic cyanobacterial blooms in a drinking water reservoir - causes, consequences and management strategy

2001 ◽  
Vol 1 (2) ◽  
pp. 237-246 ◽  
Author(s):  
M. Tarczyńska ◽  
Z. Romanowska-Duda ◽  
T. Jurczak ◽  
M. Zalewski
Keyword(s):  
Drinking Water ◽  
Management Strategies ◽  
Cyanobacterial Bloom ◽  
Water Reservoir ◽  
Dry Weight ◽  
Cyanobacterial Blooms ◽  
Potential Health ◽  
North East ◽  
Drinking Water Reservoir ◽  
Lowland Reservoirs

Eutrophication of reservoirs used for drinking water supplies is a very common problem, particularly in lowland reservoirs. Long water retention time (60-120 days) favours cyanobacterial bloom occurrence in Sulejów Reservoir, Poland. The localisation of the water intake in a bay exposed to north-east winds favoured the Microcystis bloom accumulation, which formed a 0.5 m thick dense scum for the first time in September 1999. Cyanobacterial hepatotoxins can pose a potential health problem because the presence of about 0.8 μg/l microcystins was detected in drinking water during three series of analysis. An investigation of the efficiency of each stage of water treatment processes in the elimination of microcystins showed that pre-chlorination, coagulation, and rapid sand filtration were ineffective in removing microcystins from water. Significant elimination was observed after ozonation and chlorination. The concentration of microcystins in bloom material was between 12 to 860 μg/g dry weight of phytoplankton biomass. Management strategies for reservoirs should consider the important role of ecohydrological processes, which are often very easy to regulate, and which can be useful for bio-manipulation of the water ecosystem.

scholarly journals Effects of Weir Construction on Phytoplankton Assemblages and Water Quality in a Large River System

2018 ◽  
Vol 15 (11) ◽  
pp. 2348 ◽  
Author(s):  
Hae-Jin Lee ◽  
Hae-Kyung Park ◽  
Se-Uk Cheon
Keyword(s):  
Water Quality ◽  
Chlorophyll A ◽  
River System ◽  
Large River ◽  
Anthropogenic Factors ◽  
Centric Diatom ◽  
Nakdong River ◽  
Biological Variables ◽  
Physical Chemical ◽  
The Nakdong River

Flow regulation is one of the most common anthropogenic factors affecting rivers worldwide. In Korea, 16 weirs were constructed along four major rivers from 2009 to 2012. This study aimed to elucidate initial changes in physical, chemical, and biological variables after the construction of consecutive weirs on the Nakdong River, a major large river system. Water quality variables and phytoplankton cell densities were investigated at eight representative sites and compared with the data recorded before the weir construction. There were spatial and temporal changes in the hydraulic retention time (HRT), total phosphorus (TP), and chlorophyll a concentrations among the eight weir sections. HRT increased after the weir construction, while TP and chlorophyll a tended to decrease from the middle to lower section of the Nakdong River. Furthermore, differences were observed in the phytoplankton community composition between 2006–2007 and 2013. There was a marginal decrease in the duration of centric diatom (Stephanodiscus hantzschii) blooms after weir construction. However, Microcystis aeruginosa proliferated more extensively during summer and autumn than it did before the weir construction. Our results suggest that changes in hydrological factors, in response to consecutive weir construction, may contribute to greater physical, chemical, and ecological variability.

scholarly journals Index-based and compliance assessment of water quality for a Brazilian subtropical reservoir

2018 ◽  
Vol 23 (5) ◽  
pp. 841-848 ◽  
Author(s):  
William Bonino Rauen ◽  
Ana Camila Ferraresi ◽  
Leila Maranho ◽  
Edinalva Oliveira ◽  
Rudhy Costa ◽  
...  
Keyword(s):  
Water Quality ◽  
Temporal Trends ◽  
Rank Correlation ◽  
Metropolitan Region ◽  
Biological Assessment ◽  
Trophic State Index ◽  
Reservoir Water ◽  
Spearman’S Rank Correlation ◽  
Physical Chemical

ABSTRACT The Passaúna catchment is part of the Upper Iguaçu watershed and includes a water supply reservoir for over 500,000 inhabitants of Curitiba metropolitan region. The aim of this study was to establish the state of reservoir water quality, and whether it has undergone any recent medium- and long-term variations. A physical-chemical-biological assessment was undertaken using nine indicators and three indexes: Water Quality Index (WQI), Trophic State Index (TSI) and Shannon-Weaver Index (H’) for macroinvertebrate diversity. Compliance with the prescribed quality standards for the water body was verified using frequency curves. Two WQI calculation approaches were contrasted to test for conditions of partial data unavailability. Temporal trends in key parameters were assessed using Spearman’s rank correlation coefficient. WQI results from 1991-2014 indicated that the water quality may be classified as good and improved in the final decade of such period, while most TSI results were in the oligotrophic/mesotrophic range, but with no significant temporal trend. The biodiversity result of H’=1.6 obtained with data acquired in 2014 indicated a moderately degraded ecosystem that is typically associated with flow regulation and a degree of water quality impairment. Such a multi-indicator integrated physical-chemical-biological monitoring approach comprised a robust framework for assessments of medium-long term aquatic health.

scholarly journals The climatic rhythm and blooms of cyanobacteria in a tropical reservoir in São Paulo, Brazil

2014 ◽  
Vol 74 (1) ◽  
pp. 72-78 ◽  
Author(s):  
I Ogashawara ◽  
JA Zavattini ◽  
JG Tundisi
Keyword(s):  
Water Quality ◽  
Meteorological Data ◽  
Polar Front ◽  
Sao Paulo ◽  
Cyanobacterial Blooms ◽  
Metropolitan Region ◽  
Integrated Analysis ◽  
Limiting Factor ◽  
São Paulo ◽  
Tropical Reservoir

The present study sought to develop a methodology to analyse water quality based on the concepts and methods of climate and climatology. Accordingly, we attempted to relate hydro- and limnometeorological techniques and methodologies to a rhythmic analysis technique developed within the context of the Brazilian geographical climatology. Our goal was to assess and analyse cyanobacterial blooms, the main index of water quality for the reservoirs of the “Alto Tietê” Basin and, consequently, the Metropolitan Region of São Paulo, an area of high environmental complexity due to its high degree of development and high population density. The meteorological data used were collected by the Institute of Astronomy, Geophysics and Atmospheric Sciences at the University of São Paulo meteorological station, and the limnological data were collected through the Hydrological Monitoring System implemented by SABESP in the Billings and Guarapiranga Reservoirs and the laboratory of the same entity. The rhythmic and integrated analysis showed that the process of cyanobacterial blooms is dependent on a combination of meteorological factors as temperature and wind intensity that may disrupt the stability of the reservoir, providing the conditions necessary for the development of cyanobacteria during the stabilisation process. The pace of the Atlantic Polar Front Entrance during the winter in São Paulo is a limiting factor for the growth of cyanobacteria because of their high frequency, thus maintaining the balance of the reservoir throughout this period. The weather types those could cause a instability in the water column were: Cold Front entrance (66.67%), conflict between masses (22.22%) and the Tropical Instability Line (11.11%). The possibility for prevention and forecasting periods advise when these reservoirs should not be used, mainly with regard to recreational activities.

scholarly journals Control and remediation methods for eutrophic lakes in the past 30 years

2020 ◽  
Vol 81 (6) ◽  
pp. 1099-1113 ◽  
Author(s):  
Yuan Zhang ◽  
Pingping Luo ◽  
Shuangfeng Zhao ◽  
Shuxin Kang ◽  
Pengbo Wang ◽  
...  
Keyword(s):  
New Technologies ◽  
Management Strategies ◽  
Cyanobacterial Blooms ◽  
Small Scale ◽  
Short Term ◽  
Eutrophic Lakes ◽  
Lake Ecosystems ◽  
The Past ◽  
Incomplete Removal

Abstract Accelerated eutrophication, which is harmful and difficult to repair, is one of the most obvious and pervasive water pollution problems in the world. In the past three decades, the management of eutrophication has undergone a transformation from simple directed algal killing, reducing endogenous nutrient concentration to multiple technologies for the restoration of lake ecosystems. This article describes the development and revolution of three remediation methods in application, namely physical, chemical, and biological methods, and it outlines their possible improvements and future directions. Physical and chemical methods have obvious and quick effects to purify water in the short term and are more suitable for small-scale lakes. However, these two methods cannot fundamentally solve the eutrophic water phenomenon due to costly and incomplete removal results. Without a sound treatment system, the chemical method easily produces secondary pollution and residues and is usually used for emergency situations. The biological method is cost-effective and sustainable, but needs a long-term period. A combination of these three management techniques can be used to synthesize short-term and long-term management strategies that control current cyanobacterial blooms and restore the ecosystem. In addition, the development and application of new technologies, such as big data and machine learning, are promising approaches.

scholarly journals The Radial Growth of Picea wilsonii Was More Restricted by Precipitation Due to Climate Warming on Mt. Guandi, China

Forests ◽  
2021 ◽  
Vol 12 (11) ◽  
pp. 1602
Author(s):  
Xiaoxia Huang ◽  
Xiaoneng Sun ◽  
Yuan Jiang ◽  
Feng Xue ◽  
Minghao Cui ◽  
...  
Keyword(s):  
Climate Warming ◽  
Tree Growth ◽  
Radial Growth ◽  
Management Strategies ◽  
Ring Width ◽  
Elevational Gradient ◽  
Summer Drought ◽  
Clear Trend ◽  
Biological Variables ◽  
Picea Wilsonii

Transitional climate zones (TCZ) are characterized by instability due to rapid changes in climate and biological variables, and trees growing there are particularly sensitive to climate change. Therefore, knowledge about the shifted relationships of tree growth in response to climate warming will shape regional forest conservation and management strategies. China has experienced rapid warming in recent decades. However, how tree growth in semihumid to semiarid regions, such as the Guandi Mountains, responds to more sophisticated changes in the hydrothermal combination is not yet clear. In this study, we used tree-ring width data from three sites along an elevational gradient in the Guandi Mountains to present the response of Picea wilsonii Mast. radial growth to increasing temperature and elevational differences in the relationship between tree growth and climate. The results indicated that the Guandi Mountains have experienced rapid warming with a clear trend toward aridity. From 1959 to 1995, the radial growth of P. wilsonii was mainly influenced by temperature, while it was controlled by both temperature and precipitation after rapid warming in 1996. From 1959 to 2017, this species showed a generally consistent growth–climate relationship at different elevations in the Guandi Mountains. However, the radial growth of trees at higher elevations had a higher climatic correlation than at lower elevations, and it was more conditioned by higher summer temperatures and precipitation in December of the previous year. These results suggested that P. wilsonii was more susceptible to drought and high temperatures due to a warming climate and that more attention should be devoted to forest management, especially the adverse consequences of summer drought on P. wilsonii.

scholarly journals Evaluación, Física, Química y Biológica de compostas tipo bocashi elaboradas con estiércol de bovino, ovino, cerdo y conejo más una vermicomposta

2019 ◽  
pp. 33-40
Author(s):  
Alicia De Luna-Vega ◽  
María Luisa García-Sahagún ◽  
Enrique Pimienta-Barrios ◽  
Eduardo Rodríguez-Guzmán
Keyword(s):  
Seed Germination ◽  
Root Development ◽  
Indoleacetic Acid ◽  
Biological Variables ◽  
Physical Chemical ◽  
Minimum Requirements ◽  
Agronomic Quality ◽  
Organic Compost

Some composts can produce phytotoxins that inhibit the development of plants and the absorption of nutrients by an excess of indoleacetic acid if the compost is not mature. In the present work, the objective is to evaluate the quality of the compost by means of direct tests of phytotoxicity and agronomic quality with different composts. To determine the quality as organic compost and vermicompost fertilizer were considered physical, chemical and biological variables according to existing manuals. The results obtained for these variables were: In the physical, chemical and biological variables, all the parameters are fulfilled according to the norm. Seed germination of vegetables increased with respect to the control in 14.93%, possibly due to the presence of some root development promoter found in the compost. With regard to survival the witness was inferior by 3.08% Although the amount of nutrients found in composts are not so high, they comply with the minimum requirements of the regulations to be used as a substrate in horticultural applications. Conclusion, the results of this study indicate that the compost elaborated with any type of residue can be used as a substrate in seedbeds of chili, onion or other vegetables to induce germination and accelerate the development of plants.

scholarly journals Public health responses to toxic cyanobacterial blooms: perspectives from the 2016 Florida event

Water Policy ◽  
2018 ◽  
Vol 20 (5) ◽  
pp. 919-932 ◽  
Author(s):  
James S. Metcalf ◽  
Sandra Anne Banack ◽  
James T. Powell ◽  
Fiona J. M. Tymm ◽  
Susan J. Murch ◽  
...  
Keyword(s):  
Management Strategies ◽  
Cyanobacterial Bloom ◽  
Cyanobacterial Blooms ◽  
World Health ◽  
Lake Okeechobee ◽  
Recreational Water ◽  
State Of Emergency ◽  
Guideline Values ◽  
Health Organization ◽  
World Health Organization Guideline

Abstract In June 2016, massive cyanobacterial blooms occurred in the St. Lucie River in Florida, caused by nutrient and cyanobacterial-laden water releases from Lake Okeechobee. We independently collected and analyzed bloom material for cyanotoxin diversity and concentrations. The concentrations of microcystins, potent hepatotoxins, present in the bloom material greatly exceeded World Health Organization Guideline Values for drinking and recreational water. We also detected the neurotoxins anatoxin-a(S) and β-N-methylamino-L-alanine (BMAA). The Florida State Governor declared a state of emergency, but many affected aquatic recreational areas in St. Lucie County remained open during the bloom event without adequate hazard notification to citizens. During the bloom event, issues with preparedness, communication, sampling, analysis, closures and contingencies were observed. We suggest better ways that cyanobacterial bloom events can be predicted, managed, and mitigated in the future throughout the world. As similar problems with cyanobacterial bloom frequency and occurrence present worldwide, understanding governmental responses to the 2016 Florida incident can help in the development of effective mitigation and management strategies for future bloom events.

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