scholarly journals Numerical modelling of FC bacteria using a dynamic and variable mortality rate

2020 ◽  
Vol 10 (3) ◽  
pp. 569-579
Author(s):  
Siavash Mohammadi ◽  
Seyed Mahmood Kashefipour
Keyword(s):  
Water Quality ◽  
Numerical Model ◽  
Mortality Rate ◽  
Model Comparison ◽  
Empirical Equation ◽  
Water Quality Management ◽  
Environmental Parameters ◽  
Accurate Estimate ◽  
Effective Parameters ◽  
Decay Coefficient

Abstract Faecal coliform (FC) microorganisms are one of the most important indicators in water quality management, since their presence reveals the possibility of existence of other dangerous microorganisms, leading to higher health risks. An accurate estimate of the concentration of this indicator helps better evaluation of the water pollution in riverine basins; thus, it is essential for future developments. The FC mortality rate depends on the physical, chemical, and biological processes in rivers. These processes are generally affected by environmental conditions. In this study, the decay coefficient (K) or mortality rate are related to the environmental parameters such as temperature, turbidity, pH, and salinity by an empirical equation. The results showed that turbidity and temperature are the most effective parameters. Moreover, an empirical equation was developed utilizing numerical model calibration, which describes the relationship of the mortality rate (K) with water temperature and turbidity. This equation was then added to the water quality module of the FASTER numerical model. Comparison of the measured FC concentrations with the predicted values obtained from the numerical model showed that the model accuracy significantly improved for the dynamic and variable decay coefficient.

AVAILABILITY OF NUMERICAL MATHEMATICAL MODELS TO SOLVE THE APPLIED PROBLEMS OF WATER QUALITY MANAGEMENT OF SHELF ECOSYSTEMS

2017 ◽  
Author(s):  
Kira Slepchuk ◽  
Kira Slepchuk ◽  
Tatyana Khmara ◽  
Tatyana Khmara
Keyword(s):  
Water Quality ◽  
Water Quality Management ◽  
Environmental Parameters ◽  
Biogenic Elements ◽  
Quality Model ◽  
Impurity Transport ◽  
Initial Stage ◽  
Sevastopol Bay ◽  
Phytoplankton Variability ◽  
Result Interpretation

The problems appeared during development and calibration of one-dimensional (vertical resolution) biogeochemical block of water quality model, are discussed. It is extremely useful in the initial stage of shelf ecosystems research because of its simplicity in as implementation as result interpretation. To describe the environmental parameters dynamics we used the Model for Estuarine and Coastal Circulation Assessment, which consists of hydrodynamic model; model of conservative impurity transport; chemical and biological model. The seasonal of biogenic elements and phytoplankton variability in the Sevastopol Bay is studied as an example.

scholarly journals Pollution Spread Analysis In The Malá Nitra River By Using Of 1-D Model

2014 ◽  
Vol 17 (2) ◽  
pp. 38-42
Author(s):  
Yvetta VELÍSKOVÁ ◽  
Peter HALAJ ◽  
Marek SOKÁČ ◽  
Viliam BÁREK
Keyword(s):  
Water Quality ◽  
Numerical Model ◽  
Input Data ◽  
Dispersion Coefficient ◽  
Management Practice ◽  
Water Quality Management ◽  
Longitudinal Dispersion ◽  
Toxic Substances ◽  
Longitudinal Dispersion Coefficient ◽  
Mean Values

Abstract The Water Framework Directive (WFD) is a key initiative aimed at improving water quality throughout the EU. The development of the computer technologies enables us to solve the ecological problems in water management practice very efficiently. The mathematical and numerical modelling allows evaluating various situations of contaminants spread in rivers (from everyday wastewater disposal through the fatal discharges of toxic substances) without immediate destructive impact on the environment. The paper deals with 1-dimensional numerical model HEC-RAS and its response on various values of dispersion coefficient. This parameter is one of the most important input data for simulation of pollution spread in streams. There were performed tracer experiments in the Malá Nitra River and results of these measurements are compared with results of numerical simulations. The values of the longitudinal dispersion coefficient were estimated from this comparison. The range of mean values of this coefficient determined on the base of numerical model application was 0.05 – 0.13 m2 s−1, for the other flow condition it was 0.07 – 2.5 m2 s−1 or 0.28 – 0.6 m2 s−1. The next task was carrying out the model sensitivity analysis, which means to evaluate input data influences, especially longitudinal dispersion coefficient, on outputs computed by 1-dimensional simulation model HEC-RAS. According to the results it can be said that the model HEC-RAS responds to longitudinal dispersion coefficient value changes adequately, suitably and proportionately. The application of the model HEC-RAS demonstrated the eligibility for simulation of pollution spread in streams, which means that it is a suitable tool allowing a reasonable support in decision making process connected to river water quality management.

AVAILABILITY OF NUMERICAL MATHEMATICAL MODELS TO SOLVE THE APPLIED PROBLEMS OF WATER QUALITY MANAGEMENT OF SHELF ECOSYSTEMS

2017 ◽  
Author(s):  
Kira Slepchuk ◽  
Kira Slepchuk ◽  
Tatyana Khmara ◽  
Tatyana Khmara
Keyword(s):  
Water Quality ◽  
Water Quality Management ◽  
Environmental Parameters ◽  
Biogenic Elements ◽  
Quality Model ◽  
Impurity Transport ◽  
Initial Stage ◽  
Sevastopol Bay ◽  
Phytoplankton Variability ◽  
Result Interpretation

The problems appeared during development and calibration of one-dimensional (vertical resolution) biogeochemical block of water quality model, are discussed. It is extremely useful in the initial stage of shelf ecosystems research because of its simplicity in as implementation as result interpretation. To describe the environmental parameters dynamics we used the Model for Estuarine and Coastal Circulation Assessment, which consists of hydrodynamic model; model of conservative impurity transport; chemical and biological model. The seasonal of biogenic elements and phytoplankton variability in the Sevastopol Bay is studied as an example.

Water Quality Management – A Total Catchment Management Approach

1989 ◽  
Vol 21 (2) ◽  
pp. 281-288 ◽  
Author(s):  
W. J. Hawkins ◽  
D. A. Geering
Keyword(s):  
Water Quality ◽  
Quality Management ◽  
Water Quality Management ◽  
Management Approach ◽  
Catchment Management ◽  
Know How ◽  
Wild And Scenic Rivers ◽  
Resource Managers ◽  
Resource Protection ◽  
Development Resource

Water quality standards set in the past have not helped resource managers in the decisions that they face in seeking sustainable development. Resource managers are looking for meaningful information on water quality so as to evaluate the resource, set priorities for action, and to monitor progress. Resource managers need to know how water quality affects, and is affected by, catchment uses and activities. Examples of three wild and scenic rivers, the Nymboida, Murrumbidgee, and Hawkesbury/Nepean River systems, demonstrate how a ‘Total Catchment Management' approach to resource use and resource protection has advantages for water quality management.

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