scholarly journals Seasonal changes of water quality in a tropical shallow and eutrophic reservoir in the metropolitan region of Recife (Pernambuco-Brazil)

2014 ◽  
Vol 86 (4) ◽  
pp. 1863-1872 ◽  
Author(s):  
FÁBIO H.P.C. DE OLIVEIRA ◽  
ANDRÉ L.S. CAPELA E ARA ◽  
CESAR H.P. MOREIRA ◽  
OSMAN O. LIRA ◽  
MARIA DO ROSÁRIO F. PADILHA ◽  
...  
Keyword(s):  
Water Quality ◽  
Pearson Correlation ◽  
Northeastern Brazil ◽  
Metropolitan Region ◽  
Total Hardness ◽  
Trophic State Index ◽  
Eutrophic Reservoir ◽  
Pearson Correlation Test ◽  
Apparent Color ◽  
Surface Reservoir

This study investigated the water quality in an urban eutrophic reservoir in Northeastern Brazil, considering the influence of seasonality. Monthly, samples were collected in the sub-surface reservoir. The following abiotic variables were analyzed: temperature, pH, dissolved oxygen, apparent color, turbidity, conductivity, fluoride, total nitrogen, chlorides, total dissolved solids, total hardness, iron, copper, manganese, aluminum, chlorophyll-a and phaeophytin. Total and thermotolerant coliforms were analyzed according to APHA (2012). Cyanobacteria density was quantified through its biomass. The data were analyzed using one- way ANOVA and Pearson correlation test. Higher values mean phytoplankton biomass (26.3mm3.L–1) occurred in the dry season, especially Planktothrix agardhii and Geiterinema amphibium, which occurred in 100% of samples. High trophic state index was detected throughout the year. Seasonality exerted some influence on both biotic and abiotc variables, leading to changes in water quality of the reservoir.

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 Assessment of Temporal Variation of Water Quality Parameters and the Trophic State Index in a Subtropical Water Reservoir of Bangladesh

2021 ◽  
Vol 4 (3) ◽  
pp. 164-184
Author(s):  
Md. Sirajul Islam ◽  
Yousuf Ali ◽  
Md. Humayun Kabir ◽  
Rofi Md. Zubaer ◽  
Nowara Tamanna Meghla ◽  
...  
Keyword(s):  
Water Quality ◽  
Chlorophyll A ◽  
Trophic State ◽  
Monsoon Season ◽  
Water Reservoir ◽  
Quality Parameters ◽  
Total Alkalinity ◽  
Total Hardness ◽  
Trophic State Index ◽  
State Index

This study was conducted to determine the suitability of water quality for fisheries management in Kaptai Lake from February 2019 to January 2020. Results showed that the temperature, transparency, TDS, pH, DO, EC, alkalinity and hardness were 20.9 to 31.8°C, 17 to 303 cm, 40 to 105 mg/L, 6.82 to 7.96, 6.1 to 7.65 mg/L, 75.33 to 172.33 µS/cm, 37 to 83 mg/L and 35 to 190 mg/L, respectively. However, nutrients as NH3, NO3-, NO2-, PO43- and SO42- were 0.01 to 0.05, 0.03 to 2.21, 36 to 96, 0.01 to 0.04 and 0.3 to 1.9 mg/L, respectively. Chlorophyll a and trophic state index (TSI) were 0.70 to 2.12 µg/L and 27.43 to 37.79, respectively. Study revealed that SO42-, DO and TDS were higher than the standard of ECR. On the other hand, NH3, NO3-, NO2-, PO43-, temperature, transparency, pH, EC, total hardness, total alkalinity, Chlorophyll a and TSI were within the standard levels. Concentrations of NO3-, NO2-, PO43-, Chlorophyll a and TSI (CHL) showed no significant variation with seasons. Conversely, TDS, transparency, EC, alkalinity, hardness, and SO42- were lower in monsoon compared to pre-monsoon and post-monsoon seasons. Besides, temperature, NH3, DO and TSI (SD) were higher in monsoon season. Results concluded that the Kaptai Lake is in mesotrophic condition with TSI (CHL) less than 40, and prominently there was a positive relationship between Chlorophyll a and Trophic State Index (TSI). In this regard, major nutrients and Chlorophyll a concentration in the Kaptai Lake may have an impact on the aquatic environment.

scholarly journals Yenice–Davutköy (Çanakkale) Sulama Göletlerinin Fizikokimyasal ve Mikrobiyolojik Kalitesinin Araştırılması

2017 ◽  
Vol 5 (12) ◽  
pp. 1595
Author(s):  
Kahraman Selvi ◽  
Seda Özdikmenli Tepeli ◽  
Burcu İleri ◽  
Ramazan Yıldız ◽  
Mehmet Ali Yücel
Keyword(s):  
Water Quality ◽  
Irrigation Water ◽  
Pearson Correlation ◽  
Oxygen Demand ◽  
Total Hardness ◽  
Strong Negative Correlation ◽  
Pollution Indicator ◽  
Nw Turkey ◽  
Nitrite Nitrate ◽  
High Level

The aim of this study is to determine seasonally water quality characteristics irrigation ponds. Surface water samples were collected from three different sampling points in Yenice and Davutköy irrigation ponds (NW Turkey) for four different seasons. The parameters of dissolved oxygen, pH, salinity, electrical conductivity, chemical oxygen demand, biochemical oxygen demand, ammonium, nitrite, nitrate, total hardness, chloride and sodium adsorption rate (SAR) were investigated for Yenice and Davutköy irrigation water quality. According the national and international water quality standards, physicochemical parameters were determined under permissible level. In addition, sampling ponds are located C1−S1 class of ABD salinity diagrams. This result means that salinity and sodium values of water are suitable for ecological system and can be using for irrigation. Furthermore, the microbial quality of irrigation water for the ponds were determined that rate of mesophyll and psychotropic bacteria are connected with temperature. It is detected that the term of low temperature is high level of psychotropic bacteria and the term of high temperature increase the number of mesophyll bacteria. Pearson correlation analysis between the results of the statistical psychotropic aerobic count and temperature significant was found a strong negative correlation (r= -0,635). Fecal pollution indicator as the number of E.coli stations in Davutköy pond in the summer sampling were determined 110 cfu/100ml and 50 cfu/100ml, respectively. E.coli was not detected other stations and sampling time. Finally, according to obtained analysis results are determined that water qualities for Yenice and Davutköy ponds are suitable for agriculture activities.

scholarly journals Water quality in four reservoirs of the metropolitan region of São Paulo, Brazil

2015 ◽  
Vol 27 (4) ◽  
pp. 370-380 ◽  
Author(s):  
Denise Amazonas Pires ◽  
Andrea Tucci ◽  
Maria do Carmo Carvalho ◽  
Marta Condé Lamparelli
Keyword(s):  
Water Quality ◽  
Sao Paulo ◽  
Environmental Data ◽  
Metropolitan Region ◽  
Trophic State Index ◽  
São Paulo ◽  
State Index ◽  
Components Analysis ◽  
Physical And Chemical ◽  
Guarapiranga Reservoir

Abstract Aim: This paper describes some limnological variables of four reservoirs with different trophic status (Billings, Guarapiranga, Jundiaí and Paiva Castro) of the Metropolitan Region of São Paulo, Brazil, aiming to characterize the water quality in these reservoirs. Methods Water sampling occurred between October 2011 and September 2012, on subsurface, at the pelagic compartment. Physical and chemical characteristics of water were evaluated, and the Trophic State Index (TSI) was calculated. Multivariate Principal Components Analysis (PCA) was used to ordinate sampling sites and periods in relation to environmental data. Results Two reservoirs were classified as eutrophic (Billings and Guarapiranga), one as mesotrophic (Jundiaí) and one as oligotrophic (Paiva Castro). The highest concentrations of total phosphorus, nitrogen and chlorophyll a were recorded in the eutrophic reservoirs. The lowest values of dissolved oxygen concentration were registered at Guarapiranga reservoir. Residence time in Paiva Castro reservoir was very low (one day); on the other hand, the highest value was recorded in Billings reservoir: 428 days.

scholarly journals Influencing Factors Analysis of Taiwan Eutrophicated Reservoirs

Water ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 1325 ◽  
Author(s):  
Marsha Savira Agatha Putri ◽  
Jr-Lin Lin ◽  
Lin-Han Chiang Hsieh ◽  
Yasmin Zafirah ◽  
Gerry Andhikaputra ◽  
...  
Keyword(s):  
Water Quality ◽  
Trophic State ◽  
Oxygen Demand ◽  
Principal Component ◽  
Quality Parameters ◽  
Water Quality Parameters ◽  
Total Hardness ◽  
Trophic State Index ◽  
Weather Factors ◽  
Domestic Water

Treatment cost and quality of domestic water are highly correlated with raw water quality in reservoirs. This study aims to identify the key factors that influence the trophic state levels and correlations among Carlson trophic state index (CTSI) levels, water quality parameters and weather factors in four major reservoirs in Taiwan from 2000 to 2017. Weather (e.g., air temperature, relative humidity, total precipitation, sunlight percentage and cloud cover) and water quality parameters (e.g., pH, chemical oxygen demand, suspended solids (SS), ammonia, total hardness, nitrate, nitrite and water temperature) were included in the principal component analysis and absolute principal component score models to evaluate the main governing factors of the trophic state levels (e.g., CTSI). SS were washed out by precipitation, thereby influencing the reservoir transparency tremendously and contributing over 50% to the CTSI level in eutrophicated reservoirs (e.g., the Shihmen and Chengchinghu Reservoirs). CTSI levels in the mesotrophic reservoir (e.g., Liyutan Reservoir) had strong correlation with chlorophyll-a and total phosphorus. Results show that rainfall/weather factors were the key driving factors that affected the CTSI levels in Taiwan eutrophicated reservoirs, indicating the need to consider basin management and the impacts of extreme precipitation in reservoir management and future policymaking.

scholarly journals Sensitivitas dan Kelayakan Indeks Biotik Menggunakan Makroavertebrata untuk Menentukan Status Kesehatan Sungai

2021 ◽  
Vol 26 (1) ◽  
pp. 151-158
Author(s):  
Luk luk Il Maknuun ◽  
Majariana Krisanti ◽  
Yusli Wardiatno
Keyword(s):  
Water Quality ◽  
Pearson Correlation ◽  
Water Quality Monitoring ◽  
The Other ◽  
Quality Monitoring ◽  
Biotic Indices ◽  
Natural Conditions ◽  
The Status ◽  
Pearson Correlation Test ◽  
Simple Matrix

Water-quality monitoring using macroinvertebrates has been developed by several countries to determine their water qualities. Meanwhile in Indonesia, water quality monitoring has not been developed to adapt to Indonesia’s natural conditions. Some researchers use the existing biotic indices such as FBI, LQI, SIGNAL, and others. Therefore, this study aims to determine the status of water quality using several biotic indices and to compare the sensitivity and feasibility of indices on monitoring activities using simple matrix and Pearson correlation test. The interpretation results of FBI, LQI, and Singscore to determine water quality on each station in Brantas, Opak, Progo, and Cileungsi Rivers were different. The Pearson’s correlations test showed that the sensitivities are different between rivers. Those results are affected by the river conditions and also the activities around the rivers which release the pollution into the river. The FBI index showed the greatest score number of sensitivities among the other indexes.   Keywords: macroinvertebrate, monitoring, river, sensitivity

scholarly journals Water Study of Physical, Chemical and Heavy Metals Parameters in River Indus and its Tributaries, Sindh, Pakistan

2021 ◽  
Vol 64 (2) ◽  
pp. 103-109
Author(s):  
Waqar Ahmad ◽  
Arif Zubair ◽  
Haq Nawaz Abbasi ◽  
Muhammad Imran Nasir
Keyword(s):  
Heavy Metals ◽  
Water Quality ◽  
Pearson Correlation ◽  
Oxygen Demand ◽  
Total Alkalinity ◽  
World Health ◽  
Total Hardness ◽  
Indus River ◽  
Average Value ◽  
Permissible Limits

This study was conducted to investigate the water quality of the Indus river, Sindh, Pakistan. A total of 41 locations were selected along the Indus river and its tributaries for the collection of surface water samples. Twenty-one physico-chemical parameters and heavy metals were analyzed and the data were interpreted through different statistical techniques. In the current study, eleven parameters including iron, copper, zinc, electrical conductivity (EC), total dissolved solids (TDS), pH, potassium, sodium, nitrate, sulfate, and chloride with an average value 0.13 mg/L, 0.04 mg/L, 0.16 mg/L, 733 µS/L, 211.2 mg/L, 7.6, 8.9 mg/L, 107.4 mg/L, 8.01 mg/L, 102 mg/L, 140 mg/L respectively and were within permissible limits set by the World Health Organization (WHO) for drinking water. Whereas, average values of cadmium, mercury, lead, total alkalinity (TA), chemical oxygen demand (COD), total hardness (TH) and turbidity were found 0.004 mg/L, 0.007 mg/L, 0.02 mg/L, 920 mg/L, 103 mg/L, 262 mg/L and 186.2 NTU respectively, higher than permissible limits. Pearson correlation matrix and cluster analysis were used to understand similarities and differences between variables. The variation in the correlation of different parameters shows the complexity of the water quality.    

Spatiotemporal clustering, social inequities and the risk of leptospirosis in an endemic area of Brazil: a retrospective spatial modelling

2020 ◽  
Author(s):  
Katyucia O C de Souza ◽  
José Augusto P Góes ◽  
Matheus S Melo ◽  
Paula M G Leite ◽  
Lucas A Andrade ◽  
...  
Keyword(s):  
Urban Areas ◽  
Spatial Regression ◽  
Temporal Trends ◽  
Spatial Dynamics ◽  
Secondary Data ◽  
The State ◽  
Scan Statistics ◽  
Northeastern Brazil ◽  
Metropolitan Region ◽  
Social Inequities

Abstract Background Leptospirosis is an endemic disease in Brazil of social and economic relevance related to behavioural and socioenvironmental factors. This study aimed to analyse the spatiotemporal distribution of the incidence of leptospirosis and its association with social determinants in health in a state of northeastern Brazil. Methods An ecological study of temporal series with techniques of spatial analysis using secondary data of the cases of leptospirosis notified in the Information System of Notifiable Diseases of the state of Sergipe (2008–2017) was conducted. The analysis of temporal trends was performed using Poisson regression. Spatial analyses were performed using the Moran index, the local empirical Bayesian model, scan statistics and spatial regression. Results The incidence rate decreased from 3.66 to 1.44 cases per 100 000 inhabitants in 2008 and 2017, respectively. Leptospirosis was associated with social inequities, mostly affecting males aged 20–49 y living in urban areas. The space-time scan indicated the formation of a risk cluster in municipalities in the metropolitan region of the state. Conclusions The data indicated the persistence of leptospirosis transmission, maintaining a pattern of high endemicity in some municipalities associated with social inequities. The study showed the temporal and spatial dynamics of the disease to better target specific actions for prevention and control.

scholarly journals Groundwater quality assessment using water quality index (WQI) under GIS framework

2021 ◽  
Vol 11 (2) ◽  
Author(s):  
Arjun Ram ◽  
S. K. Tiwari ◽  
H. K. Pandey ◽  
Abhishek Kumar Chaurasia ◽  
Supriya Singh ◽  
...  
Keyword(s):  
Water Quality ◽  
Groundwater Quality ◽  
Water Quality Index ◽  
Quality Index ◽  
Uttar Pradesh ◽  
Granite Gneiss ◽  
Total Hardness ◽  
Human Consumption ◽  
Anthropogenic Contamination ◽  
Quality Of Water

AbstractGroundwater is an important source for drinking water supply in hard rock terrain of Bundelkhand massif particularly in District Mahoba, Uttar Pradesh, India. An attempt has been made in this work to understand the suitability of groundwater for human consumption. The parameters like pH, electrical conductivity, total dissolved solids, alkalinity, total hardness, calcium, magnesium, sodium, potassium, bicarbonate, sulfate, chloride, fluoride, nitrate, copper, manganese, silver, zinc, iron and nickel were analysed to estimate the groundwater quality. The water quality index (WQI) has been applied to categorize the water quality viz: excellent, good, poor, etc. which is quite useful to infer the quality of water to the people and policy makers in the concerned area. The WQI in the study area ranges from 4.75 to 115.93. The overall WQI in the study area indicates that the groundwater is safe and potable except few localized pockets in Charkhari and Jaitpur Blocks. The Hill-Piper Trilinear diagram reveals that the groundwater of the study area falls under Na+-Cl−, mixed Ca2+-Mg2+-Cl− and Ca2+-$${\text{HCO}}_{3}^{ - }$$ HCO 3 - types. The granite-gneiss contains orthoclase feldspar and biotite minerals which after weathering yields bicarbonate and chloride rich groundwater. The correlation matrix has been created and analysed to observe their significant impetus on the assessment of groundwater quality. The current study suggests that the groundwater of the area under deteriorated water quality needs treatment before consumption and also to be protected from the perils of geogenic/anthropogenic contamination.

scholarly journals Assessment of Trophic Responses of a Reservoir to Seasonal and Annual Variations in Monsoon

Water ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2117
Author(s):  
Su-mi Kim ◽  
Hyun-su Kim
Keyword(s):  
Water Quality ◽  
Trophic State ◽  
Monsoon Season ◽  
Phytoplankton Growth ◽  
Phosphorus Loading ◽  
Nutrient Concentrations ◽  
Trophic State Index ◽  
Post Monsoon ◽  
Post Monsoon Season ◽  
State Index

The variations in water quality parameters and trophic status of a multipurpose reservoir in response to changing intensity of monsoon rain was investigated by applying a trophic state index deviation (TSID) analysis and an empirical regression model to the data collected in two periods from 2014 to 2017. The reservoir in general maintained mesotrophic conditions, and Carlson’s trophic state index (TSIc) was affected most by TSITP. Nutrient concentrations, particularly phosphorus, did not show strong correlations with precipitation, particularly in the period with weak monsoon, and a significant increase in total phosphorus (TP) was observed in Spring 2015, indicating the possibility of internal phosphorus loading under decreased depth and stability of water body due to a lack of precipitation. TSIChl was higher than TSISD in most data in period 1 when a negligible increase in precipitation was observed in the monsoon season while a significant fraction in period 2 showed the opposite trend. Phytoplankton growth was not limited by nutrient limitation although nutrient ratios (N/P) of most samples were significantly higher than 20, indicating phosphorus-limited condition. TSID and regression analysis indicated that phytoplankton growth was limited by zooplankton grazing in the Spring, and that cell concentrations and community structure in the monsoon and post-monsoon season were controlled by the changing intensity of the monsoon, as evidenced by the positive and negative relationships between community size and cyanobacterial population with the amount of precipitation in the Summer, respectively. The possibility of contribution from internal loading and an increase in cyanobacterial population associated with weak monsoon, in addition to potential for nutrient enrichment in the post-monsoon season, implies a need for the application of more stringent water quality management in the reservoir that can handle all potential scenarios of eutrophication.

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