scholarly journals A new approach for designing a hypolimnetic oxygenation system to improve the water quality in tropical reservoirs

2020 ◽  
Vol 7 (4) ◽  
pp. 277-285
Author(s):  
Mashallah Moridi ◽  
Neamatollah Jaafarzadeh Haghighi Fard ◽  
Abdolrahim Pazira ◽  
Fazel Amiri ◽  
Esmaeil Kouhgardi
Keyword(s):  
Water Quality ◽  
New Approach ◽  
Tropical Reservoirs ◽  
Hypolimnetic Oxygenation

A New Approach to Water Quality Objectives: Development of a Tissue-Based Site-Specific Objective for a Bioaccumulative Pollutant

2009 ◽  
Vol 2009 (6) ◽  
pp. 984-1006
Author(s):  
Karen Cowan ◽  
Earl Byron ◽  
Samuel Luoma ◽  
Theresa Presser ◽  
Gary Santolo ◽  
...  
Keyword(s):  
Water Quality ◽  
Site Specific ◽  
New Approach ◽  
Specific Objective ◽  
Water Quality Objectives

A NEW APPROACH TO ASSESSING WATER QUALITY RISK

2018 ◽  
Vol 3 (3) ◽  
pp. 1-9
Author(s):  
Stephen Westgate ◽  
Matthew Robertson
Keyword(s):  
Water Quality ◽  
New Approach ◽  
Quality Risk

A Method for Water Quality Remote Retrieva Based on Support Vector Regression with Parameters Optimized by Genetic Algorithm

2011 ◽  
Vol 383-390 ◽  
pp. 3593-3597 ◽  
Author(s):  
Tong Di He ◽  
Jian Wei Li
Keyword(s):  
Genetic Algorithm ◽  
Water Quality ◽  
Support Vector Regression ◽  
Field Data ◽  
Quality Parameters ◽  
Support Vector ◽  
Routine Method ◽  
Spectral Image ◽  
New Approach ◽  
Improve Water Quality

In order to improve water quality retrievals of multi-spectral image accurately, this paper puts forward a method for water quality remote retrieva based on support vector regression with parameters optimized by genetic algorithm. The method uses SPOT-5A data and the water quality field data, chose four representative water quality parameters, support vector regression are trained and tested, the parameters of support vector regression are optimized by genetic algorithms. The result of experiment shows that the method has more accuracy than the routine method. It provides a new approach for remote sensing monitoring of environment.

Coping with Water Quality Problems due to Hypolimnetic Anoxia in Central Ontario Lakes

1997 ◽  
Vol 32 (2) ◽  
pp. 391-405 ◽  
Author(s):  
Gertrud Nürnberg
Keyword(s):  
Water Quality ◽  
Binding Capacity ◽  
Oxygen Depletion ◽  
Eutrophic Lakes ◽  
Niagara Escarpment ◽  
Softwater Lakes ◽  
Phosphorus Accumulation ◽  
Hypolimnetic Oxygenation ◽  
Quantitative Manner ◽  
Water Outflow

Abstract Many lakes experience oxygen depletion in their hypolimnia during summer or winter stratification. This study investigates the remedial actions that are available to combat the harmful effects of hypolimnetic anoxia in three types of Central Ontario lakes with different trophic states. In more eutrophic lakes, e.g., Lake Wilcox, southern Ontario, much phosphorus accumulates in the hypolimnion during anoxia and represents ca. 60% of the annual P budget. To diminish the detrimental effects of such a high internal phosphorus load, withdrawal of the hypolimnetic waters, together with damming of the surface water outflow, has been suggested. In oligo- to mesotrophic Chesley Lake, on the Niagara Escarpment, phosphorus accumulation in the hypolimnion is only slight and metals with a binding capacity for phosphorus are available. Here a hypolimnetic oxygenation has been suggested to alleviate the stress on fish and also to prevent further P release from the sediments. Lakes in the District of Muskoka are softwater lakes because of their location on the Canadian Shield. Although the geochemistry of the catchment typically renders these lakes nutrient poor and oligotrophic, long-term development on their shores has led to phosphorus accumulation in the sediments that is released under anoxic conditions in some lakes. To prevent the deterioration of the water quality in these lakes, water quality models to manage and control future development in its watersheds, as those of the district municipality, should include anoxia and internal P recycling in a quantitative manner.

scholarly journals Influence of the use and the land cover of the catchment in the water quality of the semiarid tropical reservoirs

2018 ◽  
Vol 7 (7) ◽  
pp. 389
Author(s):  
Herika Cavalcante ◽  
Patrícia Silva Cruz ◽  
Leandro Gomes Viana ◽  
Daniely De Lucena Silva ◽  
José Etham De Lucena Barbosa
Keyword(s):  
Water Quality ◽  
Supervised Classification ◽  
Vegetation Index ◽  
Normalized Difference Vegetation Index ◽  
Landsat 8 ◽  
Dissolved Phosphorus ◽  
Sparse Vegetation ◽  
Tropical Reservoirs

The aim of this study was to evaluate some parameters of water quality of semiarid reservoirs under different uses and occupation of the catchment’s soil. For this, the reservoirs Acauã and Boqueirão, belonging to the Paraíba do Norte river watershed and Middle and Upper course sub catchments, respectively, were studied. For this, water samples were collected in August, September and October 2016. From these samples, total and dissolved phosphorus, nitrate, nitrite, ammonia, chlorophyll, dissolved and suspended solids were analyzed. In addition, images of the Landsat 8 satellite were acquired for the calculation of the Normalized Difference Vegetation Index (NDVI), and for the supervised classification of the use and occupation of the sub catchments. Thus, it was observed that, in general, the Acauã reservoir presented values of phosphorus and nitrogen and solids larger than the Boqueirão reservoir, due to the greater urban area, even though it had a smaller total area of the basin. Both reservoirs presented low vegetation rates and high areas of sparse vegetation and exposed soil, increasing the propensity to soil erosion and the transport of nutrients from the basin to the reservoirs, making water quality worse or impossible.

scholarly journals Impact of Methane Oxidation in Tropical Reservoirs on Greenhouse Gases Fluxes and Water Quality

2005 ◽  
pp. 529-560 ◽  
Author(s):  
Sandrine Richard ◽  
Philippe Gosse ◽  
Alain Grégoire ◽  
Robert Delmas ◽  
Corinne Galy-Lacaux
Keyword(s):  
Water Quality ◽  
Greenhouse Gases ◽  
Methane Oxidation ◽  
Tropical Reservoirs
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