scholarly journals Assessment of Seasonal Changes in Water Chemistry of the Ridracoli Water Reservoir (Italy): Implications for Water Management

Water ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 581 ◽  
Author(s):  
Simone Toller ◽  
Beatrice M. S. Giambastiani ◽  
Nicolas Greggio ◽  
Marco Antonellini ◽  
Ivo Vasumini ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Water Quality ◽  
Water Column ◽  
Seasonal Changes ◽  
Water Resource Management ◽  
Water Reservoir ◽  
Mixing Processes ◽  
Reservoir Water ◽  
Reservoir Water Level ◽  
Anoxic Conditions

The Ridracoli artificial basin is the main water reservoir of the Emilia-Romagna region (Northeast Italy). The reservoir was made by construction of a dam on the Bidente River in 1982. It is used as the main drinking water supply of the region and for hydropower production. The physical and chemical parameterseters (temperature, pH, electrical conductivity, and dissolved oxygen) of shallow water are continuously monitored whereas vertical depth profiles of water chemical data (major anions and cations, as well as heavy metals) are available on a bimonthly base. The dataset used in this research is related to the years 2015 and 2016. Data show that the reservoir is affected by an alternation of water stratification and mixing processes due to seasonal change in water temperature, density, and the reservoir water level. In late summer and winter months, the water column is stratified with anoxic conditions at the bottom. During the spring, on the other hand, when storage is at its maximum, water recirculation and mixing occur. The reservoir is characterized by a dynamic system in which precipitation, dissolution, and adsorption processes at the bottom affect water quality along the reservoir depth column. The temperature stratification and anoxic conditions at the reservoir bottom influence the concentration and mobility of some heavy metals (i.e., Fe and Mn) and, consequently, the quality of water that reaches the treatment and purification plant. This study is relevant for water resource management of the reservoir. Assessing the seasonal changes in water quality along the reservoir water column depth is fundamental to plan water treatment operations and optimize their costs. The reservoir assessment allows one to identify countermeasures to avoid or overcome the high concentrations of heavy metals and the stratification problem (i.e., artificial mixing of the water column, new water intakes at different depths operating at different times of the year, blowers, etc.).

scholarly journals Water quality and fish diversity of Federal University of Agriculture Abeokuta reservoir

2021 ◽  
Vol 39 (2) ◽  
pp. 150-155
Author(s):  
F. I. Adeosun ◽  
W. O. Abdul ◽  
A. A. Akinyemi ◽  
A. O. Agbon ◽  
O. C. Odebiyi
Keyword(s):  
Water Quality ◽  
Fish Species ◽  
Clarias Gariepinus ◽  
Quality Parameters ◽  
Fish Diversity ◽  
Suitable Habitat ◽  
Reservoir Water ◽  
Reservoir Water Level ◽  
Fish Yield ◽  
Ogun State

Federal University of Agriculture reservoir is one of the recently constructed in Abeokuta, Ogun state, Nigeria, therefore the need to assess the water quality, fish diversity and catch assessment of this new water body. Data on fish species were collected on a forthnight basis using multi-stage gillnet sampling techniques for four months (September- December, 2011). Three sampling stations were randomly selected from the entire reservoir. A variety of sampling methods were used at each site in order to reach every fish species. At the river channel and the floodplain sites, traps, cast nets (2.55cm mesh), seine nets (2.55 x 2 cm mesh), monofilament nylon gillnets (15.55 cm mesh), and hook and line were employed. Efforts were made in order to catch fish species in large abundance. Some sampled fish (dead) were collected and placed in cool boxes and examined within 18 hours of capture. Others were preserved in 15% formalin and stored for later examination. A total of 863 fish specimens were caught during the study period. These were identified and classified into 5 species belonging to 3 families. The percentage species composition of the harvest by numbers and weight for all fish species that contributed more than 1% in all the stations combined, were computed. Study of the physico-chemical parameter such as dissolved oxygen ranged from 5.03 to 7.19mg/l; 26 to 280C temperature; 64.8 to 148ppm alkaline; pH 6.67-6.90; 32.5 to 53.5m transparent; 8.86 to 13.72mg/l nitrate; 0.58 to 0.64mg/l phosphate; 0.024 to 0.069 o/oo saline; 103-270cm deep. pH and water temperature serve as variables since the fluctuation of one affects the values of others. The water quality parameters were favourable for fish production. The gillnet fisheries indicated that different mesh sizes of experimental gillnets were sensitive to different fish species. 67.2mm, 78.4mm and 112mm, mesh sizes were efficient in catching Clarias gariepinus, Barbus occidentalis and the Cichlids respectively. The study has shown that middle water was the most suitable habitat for fish in the reservoir. Water level and temperature were observed to guarantee high fish yield in the reservoir.

scholarly journals Water quality index and spatio-temporal perspective of a large Brazilian water reservoir

2020 ◽  
Author(s):  
Karla Lorrane de Oliveira ◽  
Ramatisa Ladeia Ramos ◽  
Sílvia Corrêa Oliveira ◽  
Cristiano Christofaro
Keyword(s):  
Water Quality ◽  
Water Quality Index ◽  
Quality Index ◽  
Water Quality Management ◽  
Water Reservoir ◽  
Material Transport ◽  
Reservoir Water ◽  
Canadian Council ◽  
Spatio Temporal ◽  
Ccme Wqi

Abstract The water spatio-temporal variability of the Irapé Hydroelectric Power Plant reservoir and its main tributaries was evaluated by analysing the temporal trend of the main parameters and applying the Canadian Council of Ministers of the Environment Water Quality Index (CCME WQI), considering data from 2008 to 2018. This reservoir is in Minas Gerais, Brazil, covering an area of approximately 142 km2, across seven municipalities. The dissolved iron (DFe) presented the highest percentage of standard violations (31.7% to 80.5%), with most frequencies being verified in the reservoir tributaries. The Mann–Kendall test indicated that the monitoring stations showed an increasing trend of 78.5% N–NH4+ and 64.1% DFe. During the evaluated period, the reservoir waters were classified as excellent (1.2%), good (61.3%), acceptable (29.5%), and poor (8.0%) according to the WQI for the proposed use. The poorest quality classes were more frequent in the tributaries, especially in the year 2009. The WQI seasonal assessment indicated a worsening during the rainy period in 57% of the stations, as a result of external material transport to the water bodies. The CCME WQI, in conjunction with temporal statistical analysis, contributed to the monitoring data interpretation, generating important information for reservoir water quality management.

scholarly journals Analysis of Heavy Metal Polution In River Mouths And Estuaries Tondano And Sario IN Manado City North Sulawesi

2014 ◽  
Vol 2 (1) ◽  
pp. 32
Author(s):  
Sandra Tilaar
Keyword(s):  
Heavy Metals ◽  
Water Quality ◽  
Heavy Metal ◽  
Environmental Monitoring ◽  
Water Column ◽  
Coastal Waters ◽  
Metal Analysis ◽  
Heavy Metal Analysis ◽  
North Sulawesi ◽  
River Mouths

This study aims to determine the concentration of heavy metal Hg and Pb in estuary waters Tondano and Sario River in the Bay of Manado, and compare the state of the estuary waters Tondano with Sario estuary waters. Information obtained from this study is expected to be useful for the management of the marine environment, particularly coastal waters, so the environmental monitoring and utilization of coastal areas can be better implemented. The study was conducted for 4 months from September to December 2013. Analasis heavy metal analysis was performed according to the instructions better for Hg, Zn and Pb. The content of Hg and Zn in the water column in the estuary waters Tondano and Sario still within tolerable levels. The content of Pb in the water column in the estuary waters and estuary Tondano and Sario has passed the specified levels and has passed the tolerable levels. Human activity continues to grow around the Gulf waters of Manado so may result in appropriate changes that can lead to contamination, because it is necessary to monitor water quality regularly and continuously.   Keywords: pollution, heavy metals, water quality   A b s t r a k Penelitian ini bertujuan mengetahui konsentrasi logam berat Hg dan Pb pada Perairan Muara Sungai Tondano dan Sungai Sario di Teluk Manado, serta membandingkan keadaan Perairan Muara Sungai Tondano dengan Perairan Muara Sungai Sario. Informasi yang diperoleh dari penelitian ini diharapkan dapat bermanfaat bagi pengelolaan lingkungan perairan, khususnya perairan pantai, sehingga pemantauan lingkungan dan pemanfaatan wilayah pesisir pantai dapat dilaksanakan lebih baik. Penelitian dilakukan selama 4 bulan sejak bulan September sampai dengan bulan Desember 2013. Analasis logam berat dilakukan menurut petunjuk analisis baik untuk Hg, Zn dan Pb. Kandungan Hg dan Zn pada kolom air pada perairan Muara Sungai Tondano dan Muara Sungai Sario masih dalam kadar yang ditoleransi. Kandungan Pb pada kolom air di perairan Muara Sungai Tondano dan Muara Sungai Sario telah melewati kadar yang ditetapkan dan telah melewati kadar yang ditoleransi. Adanya aktivitas manusia yang terus berkembang di sekitar Perairan Teluk Manado sehingga dapat mengakibatkan terjadinya perubahan-perubahan secara tepat yang dapat mengakibatkan pencemaran, karena itu perlu diadakan pemantauan kualitas air secara berkala dan berkesinambungan.   Kata kunci : pencemaran, logam berat, kualitas air

VİLƏŞÇAY SU ANBARININ SUYUNUN KEYFİYYƏTİNİN KİMYƏVİ GÖSTƏRİCİLƏRƏ GÖRƏ QİYMƏTLƏNDİRİLMƏSİ

2021 ◽  
Vol 1 (1) ◽  
pp. 106-115
Author(s):  
C.A. Məmmədova
Keyword(s):  
Water Quality ◽  
Ionic Composition ◽  
Water Reservoir ◽  
Water Hardness ◽  
World Health ◽  
Concentration Limit ◽  
Reservoir Water ◽  
Chemical Indicators ◽  
Sodium And Potassium ◽  
Hydrological Station

Abstract: The article is devoted to the assessment of water quality according to chemical indicators in the vileshchay water reservoir, which is the main source of drinking water supply in Masalli region. The study used the results of the analysis of water samples covering the years 1994-2017 of the Shikhlar hydrological station operating on the vileshchay, the main source of nutrition of the reservoir. The basic ions and water hardness were determined. The results of the analysis were compared with the existing Sanitary Norms and Regulations, as well as with the World health Organization's permissible Solidarity limit, and the results obtained were analyzed. unlike other lankaran rivers, vileshchay water belongs to the chlorine class of the sodium and potassium group, as the river is dominated by chlorine from anions and sodium and potassium from cations during the year. Keywords: Vileshchay reservoir, water quality, ionic composition, water hardness, permissible concentration limit.

scholarly journals PENGGUNAAN RESERVOIR TERHADAP PERFORMA UDANG WINDU (Penaeus monodon Fabricius) YANG DIBUDIDAYAKAN SECARA TRADISIONAL (The Use of Reservoirs to the Performance Tiger Shrimp (Penaeus monodon Fabricius) on Culture Traditional Pond)

2017 ◽  
Vol 13 (1) ◽  
pp. 52
Author(s):  
Titik Susilowati ◽  
Tristiana Yuniarti ◽  
Fajar Basuki
Keyword(s):  
Water Quality ◽  
Biomass Production ◽  
Penaeus Monodon ◽  
Water Reservoir ◽  
T Test ◽  
Phytoplankton Abundance ◽  
Reservoir Water ◽  
Tiger Shrimp

 Penelitian ini bertujuan untuk mengetahui produksi biomassa,  kelulushidupan udang windu (Penaeus monodon Fabricius) dan kelimpahan fitoplankton yang dibudidayakan di tambak tradisional dengan reservoir dan tanpa reservoir. Penelitian dilakukan dengan menggunakan metode deskriptif   Padat tebar udang windu 2 ekor/m2.  Pemeliharaan dilakukan selama 3 bulan (ukuran konsumsi). Data produksi udang dan kelimpahan plankton dianalisis dengan Uji-T dan data kualitas air yang diperoleh dianalisis secara deskriptif. Hasil penelitian menunjukkan bahwa produksi udang windu pada tambak dengan menggunakan reservoir dan tanpa reservoir berbeda nyata  (p<0.050) dengan nilai 48.8 ± 25.90 kg pada tambak dengan menggunakan reservoir dan 9 ± 7.31 kg pada tambak tanpa reservoir. Sedangkan kelimpahan fitoplankton tidak menunjukkan perbedaan nyata (p > 0.05) dengan nilai 16.37 ± 4.24 sel / L untuk tambak reservoir dan 15.73 ± 2.20 sel / L  untuk tambak tanpa reservoir. Kualitas air media tambak dengan reservoir yaitu  suhu: 26.8 – 31.0oC. DO : 1.25-8.86 mg/L., pH air : 7.5-9.2., kecerahan : 25-47.5 cm., kedalaman air : 75-95 cm dan nilai salinitas 5-21 ppt. Sedangkan tambak tanpa reservoir suhu: 24.7-32.4oC., DO : 1.25-8.46 mg/L. pH air : 8.0-9.1. kecerahan : 25.5-40 cm., kedalaman air : 70-90., salinitas: 9-18 ppt. Berdasarkan hasil penelitian dapat disimpulkan bahwa penggunaan reservoir pada budidaya udang windu tradisional dapat meningkatkan produksi udang monodon (P. monodon Fabricius)   The aim of the research is determining the biomass production of tiger shrimp (P. monodon .F) and abundance of phytoplankton which is maintained in a traditional pond with water reservoir and without using water reservoir. The method that is used in this deskriptif  Two treatment. namely traditional pond with water reservoir and without using water reservoir. Rearing the shrimp was done until 3 mount. Data biomass production shrimp were  analysed with T-test and data water quality were analyzed descriptively. The result shows that the pond cultivation using water reservoir and without water reservoir significant effect ( p < 0.05) on the biomass production of tiger shrimp to the ponds by using a reservoir with a mean 49.8 ± 23.90 kg and 9 ± 6.31 for pons without a reservoir. While the pond using water reservoir and without reservoir have not significant effect ( p > 0.05) on the phytoplankton abundance of 16.37 ± 4.24 cell / L for the pond by using a reservoir and 15.73 ± 2.20 cell / L for the pond without a reservoir. Water quality for temperature: 26.8 – 31.0oC., DO : 1.25-8.86 mg/L., pH : 7.5-9.2., brightness : 25-47.5 cm., depth : 75-95 cm and  salinity 5-21 ppt for ponds by using a reservoir and temperate 24.7 – 31.0oC., DO : 1.25-8.46 mg/L., pH : 8.0-9.1., brightness : 25.5-40 cm., depth : 70-95 cm and  salinity 9-18 ppt without reservoir.  From the data conclude that traditional pond with water reservoir can improve the biomass production of tiger shrimp to the pond.  

scholarly journals Characteristics of Arsenic Leached from Sediments: Agricultural Implications of Abandoned Mines

2019 ◽  
Vol 9 (21) ◽  
pp. 4628 ◽  
Author(s):  
Soonho Hwang ◽  
Younggu Her ◽  
Sang Min Jun ◽  
Jung-Hun Song ◽  
Goontaek Lee ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Water Quality ◽  
Agricultural Land ◽  
Temporal Variations ◽  
Management Plan ◽  
Abandoned Mines ◽  
Reservoir Water ◽  
Sediment Types ◽  
Hydrochemical Composition ◽  
Arsenic Leaching

Heavy metals, including arsenic from abandoned mines, are easily transported with sediment and deposited in waterbodies such as reservoirs and lakes, creating critical water quality issues when they are released. Understanding the leaching of heavy metals is necessary for developing efficient water quality improvement plans. This study investigated how arsenic leaches from different soil and sediment types and responds to hydrologic conditions to identify areas susceptible to arsenic contamination. In this study, batch- and column-leaching tests and sequential extraction procedures were used to examine arsenic leaching processes in detail. The results showed that most arsenic-loaded sediments accumulated in the vicinity of a reservoir inlet, and arsenic in reservoir beds have a higher leaching potential than those from agricultural land and stream beds. Arsenic deposited at the bottom of reservoirs had higher mobility than that in the other soils and sediments, and arsenic leaching was closely associated with the acidity of water. In addition, arsenic leaching was found to be responsive to seasons (wet or dry) as its mobilization is controlled by organic compounds that vary over time. The results suggested that temporal variations in the hydrochemical composition of reservoir water should be considered when defining a management plan for reservoir water quality.

scholarly journals Seasonal Water Quality and Algal Responses to Monsoon-Mediated Nutrient Enrichment, Flow Regime, Drought, and Flood in a Drinking Water Reservoir

2021 ◽  
Vol 18 (20) ◽  
pp. 10714
Author(s):  
Md Mamun ◽  
Usman Atique ◽  
Ji Yoon Kim ◽  
Kwang-Guk An
Keyword(s):  
Water Quality ◽  
Drinking Water ◽  
Flow Regime ◽  
Nutrient Enrichment ◽  
Water Reservoir ◽  
Reservoir Water ◽  
Chl A ◽  
Drought And Flood ◽  
Drinking Water Reservoir

Freshwater reservoirs are a crucial source of urban drinking water worldwide; thus, long-term evaluations of critical water quality determinants are essential. We conducted this study in a large drinking water reservoir for 11 years (2010–2020). The variabilities of ambient nutrients and total suspended solids (TSS) throughout the seasonal monsoon-mediated flow regime influenced algal chlorophyll (Chl-a) levels. The study determined the role of the monsoon-mediated flow regime on reservoir water chemistry. The reservoir conditions were mesotrophic to eutrophic based on nitrogen (N) and phosphorus (P) concentrations. An occasional total coliform bacteria (TCB) count of 16,000 MPN per 100 mL was recorded in the reservoir, presenting a significant risk of waterborne diseases among children. A Mann–Kendall test identified a consistent increase in water temperature, conductivity, and chemical oxygen demand (COD) over the study period, limiting a sustainable water supply. The drought and flood regime mediated by the monsoon resulted in large heterogeneities in Chl-a, TCB, TSS, and nutrients (N, P), indicating its role as a key regulator of the ecological functioning of the reservoir. The ambient N:P ratio is a reliable predictor of sestonic Chl-a productivity, and the reservoir was P-limited. Total phosphorus (TP) had a strong negative correlation (R2 = 0.59, p < 0.05) with the outflow from the dam, while both the TSS (R2 = 0.50) and Chl-a (R2 = 0.32, p < 0.05) had a strong positive correlation with the outflow. A seasonal trophic state index revealed oligo-mesotrophic conditions, indicating a limited risk of eutrophication and a positive outcome for long-term management. In conclusion, the Asian monsoon largely controlled the flood and drought conditions and manipulated the flow regime. Exceedingly intensive crop farming in the basin may lead to oligotrophic nutrient enrichment. Although the reservoir water quality was good, we strongly recommend stringent action to alleviate sewage, nutrient, and pollutant inflows to the reservoir.

scholarly journals Static analysis of a high arch dam

2019 ◽  
pp. 45-57
Author(s):  
Yaser Ghafoori ◽  
Andrej Kryžanowski ◽  
Dejan Zupan
Keyword(s):  
Water Level ◽  
Static Analysis ◽  
Three Dimensional ◽  
Water Reservoir ◽  
Arch Dam ◽  
Three Dimensional Model ◽  
High Arch Dam ◽  
Reservoir Water ◽  
Reservoir Water Level ◽  
Arch Dams

The paper presents the design and static analysis of a high arch dam. A feasibility study was conducted on the dam in the 90s and a preliminary layout was designed. However, the dam’s construction phase has been never started. In this paper, the design and layout of the dam under consideration are in accordance with the US manuals for the design of arch dams. The structure’s three-dimensional model was entered into the program SAP2000 and three-dimensional solid finite elements were used to discretize the model. This paper considers the hydrostatic pressure of the water reservoir and concrete self-weight. The analysis was performed for both the maximum and the minimum designed water level and for the case when the reservoir is empty. Special attention is given to the boundary conditions of the dam at its abutments and foundation. The results show that the planned layout is good for the dam’s construction. The arch dam’s curve transfers the loads to the abutments. The significant role of the foundation rigidity and the reservoir water level in the stress distribution and nodal displacements within the arch dam is observed.

scholarly journals Water Level Decline in a Reservoir: Implications for Water Quality Variation and Pollution Source Identification

2020 ◽  
Vol 17 (7) ◽  
pp. 2400
Author(s):  
Zixiong Wang ◽  
Tianxiang Wang ◽  
Xiaoli Liu ◽  
Suduan Hu ◽  
Lingxiao Ma ◽  
...  
Keyword(s):  
Water Quality ◽  
Water Level ◽  
Principal Component ◽  
Ammonia Nitrogen ◽  
Pollution Source ◽  
Biological Action ◽  
Pollution Sources ◽  
Reservoir Water ◽  
Reservoir Water Level ◽  
Water Level Decline

Continuous water-level decline makes the changes of water quality in reservoirs more complicated. This paper uses trend analyses, wavelet analysis and principal component analysis-multiple linear regression to explore the changes and pollution sources affecting water quality during a period of continuous reservoir water level decline (from 65.37 m to 54.15 m), taking the Biliuhe reservoir as an example. The results showed that the change of water level of Biliuhe reservoir has a significant 13-year periodicity. The unusual water quality changes during the low water level period were as follows: total nitrogen continued to decrease. And iron was lower than its historical level. pH, total phosphorus, and ammonia nitrogen were higher than historical levels and fluctuated seasonally. Permanganate index increased as water level decreased after initial fluctuations. Dissolved oxygen was characterized by high content in winter and relatively low content in summer. The pollutant sources of non-point source pollution (PC1), sediment and groundwater pollution (PC2), atmospheric and production & domestic sewage (PC3), other sources of pollution (PC4) were identified. The main source of DO, pH, TP, TN, NH4-N, Fe and CODMn were respectively PC3 (42.13%), PC1 (47.67%), PC3 (47.62%), PC1 (29.75%), PC2 (47.01%), PC1 (56.97%) and PC2 (50%). It is concluded that the continuous decline of water level has a significant impact on the changes and pollution sources affecting water quality. Detailed experiments focusing on sediment pollution release flux, and biological action will be explored next.

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