scholarly journals Modeling Dynamic Processes of Mondego Estuary and Óbidos Lagoon Using Delft3D

2021 ◽  
Vol 9 (1) ◽  
pp. 91
Author(s):  
Joana Mendes ◽  
Rui Ruela ◽  
Ana Picado ◽  
João Pedro Pinheiro ◽  
Américo Soares Ribeiro ◽  
...  
Keyword(s):  
Water Quality ◽  
Water Temperature ◽  
Temperature Limit ◽  
Source Model ◽  
Water Volume ◽  
Tidal Propagation ◽  
Mondego Estuary ◽  
Estuarine Systems ◽  
The One

Estuarine systems currently face increasing pressure due to population growth, rapid economic development, and the effect of climate change, which threatens the deterioration of their water quality. This study uses an open-source model of high transferability (Delft3D), to investigate the physics and water quality dynamics, spatial variability, and interrelation of two estuarine systems of the Portuguese west coast: Mondego Estuary and Óbidos Lagoon. In this context, the Delft3D was successfully implemented and validated for both systems through model-observation comparisons and further explored using realistically forced and process-oriented experiments. Model results show (1) high accuracy to predict the local hydrodynamics and fair accuracy to predict the transport and water quality of both systems; (2) the importance of the local geomorphology and estuary dimensions in the tidal propagation and asymmetry; (3) Mondego Estuary (except for the south arm) has a higher water volume exchange with the adjacent ocean when compared to Óbidos Lagoon, resulting from the highest fluvial discharge that contributes to a better water renewal; (4) the dissolved oxygen (DO) varies with water temperature and salinity differently for both systems. On the one hand, for Mondego Estuary during winter the DO levels mainly fluctuate with salinity. On the other hand, for Óbidos Lagoon, DO distribution is determined by both water temperature and salinity. During summer, the high residence time and water temperature limit the DO levels in both systems. The high transferability and superior stability of Delft3D make this model a foundation for realistic simulation and research of distinct estuarine systems, giving support to their maintenance and restoration.

scholarly journals Budidaya ikan mas (Cyprinus carpio) sistem akuaponik dengan padat penebaran berbeda

2019 ◽  
Vol 7 (2) ◽  
Author(s):  
Darwis Darwis ◽  
Joppy D. Mudeng ◽  
Sammy N.J. Londong
Keyword(s):  
Water Quality ◽  
Cyprinus Carpio ◽  
Stocking Density ◽  
Quality Parameters ◽  
Water Volume ◽  
Daily Growth ◽  
Growth And Survival ◽  
Experimental Fish ◽  
The Difference

This research aimed to determine the stocking density that support the best growth and survival rate of carp cultivated in aquaponic systems, and to study the water quality of carp culture with different stocking densities in aquaponic systems. The study used 12 aquaria measuring 40x40x40 cm each (water volume of 50 liters). The experimental fish are carp (Cyprinus carpio) weighing in average of 3.5 g/individual.  The fish were cultivated with different stocking densities as treatment, including A = 4; B = 7; C = 10 and D = 13 individuals/aquarium.  The fish were fed with pellet at 5%/body weight/day with a feeding frequency of two times a day. The study was conducted for 4 weeks. Data consisting of daily growth, survival and water quality parameters (temperature, pH, dissolved oxygen, ammonia, nitrite and nitrate) were measured once a week. The data obtained were analyzed by ANOVA. The results of the study showed that the difference in stocking density had no significant effect on the growth and survival of carp.  Water quality was in a reasonable range to support the growth and survival of carp cultivated with aquaponic systems.Keywords: cultivation, carp, aquaponics, stocking density, growth

Thermal stratification of Portuguese reservoirs: potential impact of extreme climate scenarios

2015 ◽  
Vol 6 (3) ◽  
pp. 544-560 ◽  
Author(s):  
Manuel C. Almeida ◽  
Pedro S. Coelho ◽  
António C. Rodrigues ◽  
Paulo A. Diogo ◽  
Rita Maurício ◽  
...  
Keyword(s):  
Water Quality ◽  
Water Temperature ◽  
Thermal Stratification ◽  
Climate Models ◽  
Climate Impacts ◽  
Water Volume ◽  
Quality Model ◽  
Runoff Reduction ◽  
The Mean ◽  
Water Uses

Changes in water temperature and stratification dynamics can have a significant effect on hydrodynamics and water quality in reservoirs. Therefore, to assess future climate impacts, projections of three regional climate models for Europe, under the IPCC A1B emission scenario (2081–2100), were used with the CE-QUAL-W2 water quality model to evaluate changes in the thermal regime of 24 Portuguese reservoirs, representing different geographic regions, morphologies, volumes and hydrological regimes. Simulation results were compared with reference simulations for the period 1989–2008 and changes in water temperature and thermal stratification characteristics were evaluated. Future inflow scenarios were estimated from precipitation-runoff non-linear correlations and outflows were estimated considering present water uses, including hydropower, water supply and irrigation. Results suggest a significant increment in the mean water temperature of the reservoirs for the entire water volume and at water surface of 2.3 and 2.5 °C, respectively, associated with a runoff reduction of approximately 23%. Overall, variations in annual stratification patterns are characterized by changes in the mean annual length of stratification anomaly that ranged from −21 to +39 days. Results also show the influence of depth and volume over the reservoir's temperature anomaly, highlighting the importance of future water uses and operation rule curves optimization for reservoirs.

scholarly journals A NOTE ON THE ECOSYSTEM HEALTH OF A GLACIER-FED RIVER PINDER FROM CHAMOLI GARHWAL, UTTARAKHAND

2019 ◽  
Vol 14 (2) ◽  
Author(s):  
K L Bisht ◽  
A K Dobriyal ◽  
H R Singh
Keyword(s):  
Water Quality ◽  
Water Temperature ◽  
Fish Species ◽  
Ecosystem Health ◽  
Biological Productivity ◽  
Ecological Characteristics ◽  
Plankton Species ◽  
Population Quality

The paper deals with a summarized account of ecological characteristics and biological productivity of river Pinder which is well known for its water quality conducive for the most important schizothoracine fishery of Uttarakhand. It was observed that the low water temperature and clarity of water favours good populations of phytobenthos and macrozoobenthos which in their turn supports the population quality of fishes. Overall 32 plankton species, 23 macrozoobenthic and 24 fish species were recorded.

scholarly journals A new charophyte habitat with a stabilized good ecological potential of mine water

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Agnieszka Napiórkowska-Krzebietke ◽  
Andrzej Robert Skrzypczak
Keyword(s):  
Water Quality ◽  
Trace Elements ◽  
Mine Water ◽  
Trophic Conditions ◽  
Toxic Risk ◽  
Toxic Cyanobacteria ◽  
The One ◽  
Water Ecosystems ◽  
Ecological Potential

AbstractEach newly-created pond which is supplied with mine water gives the opportunity to study a unique ecosystem in context of possible conditions for biotic live. Therefore, this research aimed to assess a phytoplankton-based ecological potential against the trophic conditions and the risk of contamination with trace elements, and demonstrate the possibility to stabilize at least good water quality of a clarification pond. The gradual decrease in turbidity-related variables (including suspended solids and iron) and nutrients, on the one hand, and an increase in phytoplankton-related indicators, on the other hand, were the most evident. Besides, relative stability in trace elements (the best water quality class), trophic level (slightly eutrophic level) and ecological potential (maximum potential), and relative instability in sulfates and calcium were also recorded. The final stabilization of water habitat resulted in abundant growth of charophyte Nitella mucronata. This all suggested a new ecological opportunity for settlement of a rare species and important for biodiversity enhancement. Furthermore, the study revealed that a clarification pond did not pose any toxic risk from the elevated content of trace elements or the growth of toxic or potentially toxic cyanobacteria which is essential for proper functioning and management of water ecosystems.

scholarly journals Quality of the Surface Water in the Ratka Small Water Reservoir

2021 ◽  
Vol 906 (1) ◽  
pp. 012097
Author(s):  
Zuzana Sabová
Keyword(s):  
Water Quality ◽  
Surface Water ◽  
Organic Carbon ◽  
Water Temperature ◽  
Slovak Republic ◽  
Water Reservoir ◽  
Field Measurements ◽  
Small Water ◽  
The Government

Abstract The aim of the contribution is to evaluate the state of the quality of the surface water in the Ratka small water reservoir and its surroundings. The Ratka small water reservoir is included in fishing grounds; it is therefore necessary to know the quality of the surface water. The work is focused on an evaluation of the surface water quality indicators, i.e., the water temperature, pH reaction, content of the nitrate nitrogen, nitrite nitrogen, and the ammonia nitrogen, the chemical oxygen demands, and the total organic carbon. The analysis was divided into field measurements and laboratory measurements. Three sampling points were identified, from which samples were regularly taken. For water temperature and pH reaction, the field measurements were performed every month during 2019 and for other selected indicators of water quality, the field measurements were performed during April – September 2019. The laboratory analyses were realized in 2019 (summer, winter) and were focused only on samples from the Ratka small water reservoir. To evaluate the results, they were compared with the recommended values found in the valid Regulation of the Government of the Slovak Republic No. 269/2010 Coll. After evaluating the results of the study, increased values indicators of quality of the surface water were found water temperature, pH reaction, N — NO2 , chemical oxygen demands and total organic carbon. Phosphate contents are also present in the water. The results showed that the Ratka small water reservoir, due to the increased values of the mentioned indicators of the quality of the surface water, does not meet the set conditions of the Government of the Slovak Republic. The significance of this study can be seen not only in the importance of water quality assessment from the practical point of view, but also in the need to perform these analyses, especially in areas where no water quality assessments have been performed so far, an example of which is the Ratka small water reservoir assessed in this study.

scholarly journals Groundwater quality assessment of Dashtestan using WQI index in 2007

2021 ◽  
Author(s):  
Omid Memarian Sorkhabi
Keyword(s):  
Water Quality ◽  
Economic Development ◽  
Quality Index ◽  
Poverty Reduction ◽  
The Other ◽  
Groundwater Quality Assessment ◽  
Management Measures ◽  
Quality Of Water ◽  
The One

Abstract Water is a major source of economic development, social security and poverty reduction. The value of this resource on the one hand and its limitation on the other hand has led to increased management measures to maintain the quantity and quality of water by different communities. In this research, the water quality index (WQI) for the Dehroud and Tang Eram regions of Dashtestan in 2007 has been investigated. The average WQI in 2007 is 66,798. WQI was better off in the Northeast in 2007 than in the Southeast. The maximum values of PH, TDS and EC in 2007 are 7.9, 5000 and 7500, respectively.

scholarly journals Efektivitas ekstrak daun pandanwangi sebagai insektisida nabati dalam mengurangi jumlah lalat selama penjemuran ikan patin asin

Jurnal Zona ◽  
2021 ◽  
Vol 1 (2) ◽  
pp. 42-49
Author(s):  
Hilyati Fadhlah ◽  
Feliatra Feliatra ◽  
Rahman Karnila
Keyword(s):  
Water Quality ◽  
Staphylococcus Aureus ◽  
Human Health ◽  
Research Methods ◽  
Leaf Extract ◽  
Statistical Test ◽  
Economic Conditions ◽  
The One ◽  
Service Data

The size of the fly population at the time of Salted Catfish production (SC) is one of theimportant problems that will have an impact on the health and deterioration of fish quality, as well ashaving an impact on socio-economic conditions. Flies are mechanical vectors for the transmission ofdiseases carried through microorganisms Staphylococcus aureus (S.aureus). To deal with this problemproducers use chemical insecticides which are sometimes used at inappropriate dosages, so that they willadversely affect human health and the environment. therefore it is used by Fragrant Pandan Leaves(FPL) which have chemicals as poisons for vectors and safe for humans. This study aims to identify thecontamination of S.aureus bacteria in SC from Penyasawan Village, to analyze the effectiveness of FPLextracts in reducing the number of flies in the process of drying the SC on product acceptance. Usingexperimental research methods, with RAL, it was carried out at the UPTD laboratory for fish diseasesand the water quality of the Kampar Regency Fisheries Service. Data were analyzed using the One-WayANOVA statistical test. The results showed that, for the most part Salted Catfish from PenyasawanVillage is identified contamination of Staphylococcus aureus bacteria. Pandan Wangi Leaf Extract caneffectively reduce the density of flies that perch during drying of Salted Catfish with the highestconcentration having the greatest resistance to the flies of flies. Salted Catfish soaked in Pandan Wangileaves are in demand by consumers

scholarly journals PEMANFAATAN Azolla sp. UNTUK PENURUNAN KANDUNGAN COD DALAM LIMBAH LAUNDRY

2016 ◽  
Vol 18 (2) ◽  
pp. 67 ◽  
Author(s):  
Ammelia Mentari ◽  
Namastra Probosunu ◽  
Ratih Ida Adharini
Keyword(s):  
Water Quality ◽  
Water Temperature ◽  
Effective Time

This research aims to know the ability of Azolla sp. to improve the water quality of laundry wastewater based on COD. This research applied 6 treatments with 3 replications using Completely Randomize Design (CRD) analysis. The treatment consists of P0 (0 gram), P1 (50 gram), P2 (100 gram), P3 (150 gram), and P4 (200 gram) which was placed in a tank that contains 30 liters of laundry wastewater with 50% dilution. The parameters of water quality such as COD, pH, water temperature, and biomass were being observed in every 7 days for 21 days. The result showed that Azolla sp. has the ability to improve the quality of the water from laundry wastewater, especially in lowering the COD level. The results showed that the laundry wastewater’s COD decreases from 133,43 mg/L to 41,52 mg/L. The density and the effective time of Azolla sp. in improving the quality of laundry wastewater is on 7 days of 150 gram treatment or 14 days of 50 gram treatment

scholarly journals The water quality of streams located in large urban agglomeration, case study of the SłuŻewiecki Stream

2018 ◽  
Vol 44 ◽  
pp. 00193 ◽  
Author(s):  
Małgorzata Wojtkowska ◽  
Magdalena Matula ◽  
Paulina Kozińska
Keyword(s):  
Water Quality ◽  
Field Research ◽  
Capital City ◽  
Factors Affecting ◽  
Urbanized Area ◽  
Poor Water Quality ◽  
The Subject ◽  
The One

The quality assessment of watercourse, located in a highly urbanized area was the goal of research. The SłuŻewiecki Stream, which flows in the southern part of the capital city of Warsaw is the subject of study. The aim of the research was to determine the tendency of the water quality changes in the SłuŻewiecki Stream, flowing in the highly urbanized area and being a sink of the non-point and industry sources of pollutions as well as the surface runoffs which comes from its catchment. The field research was conducted along the entire length of the stream in 2015 and 2016. The water samples were collected monthly from a depth to 20 cm. Water quality tests were carried out in accordance with the valid analytical methods. The obtained results point to poor water quality. Therefore it can be conducted that the development and use of the direct catchment is the one of main factors affecting the water quality in SłuŻewiecki Stream. The tributaries, often not inventoried, from built-up, populated areas, are the most polluted. Tributaries contain large amount of organic compounds and nutrients.

Is it possible to influence water temperature and quality in the river seine upstream of Paris in summer by managing the upstream reservoirs?

1995 ◽  
Vol 31 (8) ◽  
pp. 67-77 ◽  
Author(s):  
K. Malatre ◽  
Ph. Goose
Keyword(s):  
Water Quality ◽  
Water Temperature ◽  
Significant Influence ◽  
River Flow ◽  
Simulation Models ◽  
Considerable Improvement ◽  
Water Release ◽  
River Seine ◽  
Supply Water

There are four major reservoirs upstream of Paris, on the Seine, Aube, Marne and Yonne rivers. These reservoirs partially prevent flooding in winter and spring, and supply water in summer to maintain a minimum river flow. The quantitative and qualitative impact of summer water releases from dams on temperature and quality of downstream rivers has been assessed, thanks to a measurement survey conducted in 1990 and 1991 and use of simulation models. Two types of reservoirs are distinguished: – the Yonne reservoir, directly on the river, which is rather deep and can have a significant influence on the near downstream temperature, but hardly any just upstream of the Seine confluence – the Seine, Aube and Marne reservoirs, bypassing the rivers, which are shallow and have a very moderate impact on downstream temperatures. The study of an experimental water release on the Seine showed that for this second type of reservoir it is difficult to achieve considerable improvement in water quality in the downstream rivers by means of reservoir releases in summer, except locally in cases of significant pollution inputs. Among the ten parameters under study, conductivity and alkalinity were the only ones measured whose values could be affected by the dam release over a distance greater than 100 km downstream.

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