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A simple numerical model for water quality assessment with constant absorption around nok phrao island of trang river
(2020-01-01)
Kraychang, Witsarut
;
Pochai, Nopparat
Nok Phrao Island is given to the island by the indigenous people. It is located near the Trang estuary with several rivers flowing through. Since this island is the assembly point of different river currents, it consequently causes problems with the quality of water. This island area accumulates different pollution such as municipal and industrial pollution. This problem affects today life of the local people such as their occupation, healthy, and ecosystem. However, there are some problems which are still unsolved because of many influential factors which cannot yet be identified. In order to overcome these obstacles, mathematical models could be useful before conducting operations on the Nok Phrao Island. In this research, mathematical models were applied to assess the water quality at Nok Phrao Island by assuming observation points in the models to get a pollutant concentration before and after the implementation of biological treatment from the wastewater treatment station. The mathematical models proposed in this research could be recommended for the assessment of the standard water quality at Nok Phrao Island to account for the increase in population or growth of industries around Nok Phrao Island in the future.
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Numerical simulation of water-quality model on flooding using revised lax-diffusive and modified siemieniuch-gladwell methods
(2019-12-01)
Subklay, Kanawoot
;
Pochai, Nopparat
In 2011, Thailand has been confronted a largest flooding. The mass of water has been drenched from many main and branch rivers to cover wide areas. The residents who lived in the flooding area have to build a manmade sandbag dike to protect their village. The flooding has been taken for a long time meanwhile the flooding water becomes contaminated. There are some residents in their flooding area want to drain their contaminated water to a nearest area. They have been destroyed their sandbag dike. Consequently, the dispute among residents is occurred. In this research, a mathematical simulation of a water-quality on a long period flooding using a couple of two models is proposed. The first model is the one-dimensional shallow water equations that provide the water elevation and velocity. The second model is a one-dimensional advection-dispersion equation that provides the water pollutant concentrations after the sandbag dike has been destroyed. A revised Lax-diffusive is used to approximate the solution of the first model. Consequently, the numerical solutions of the second model are obtained by using the traditional and modified Siemieniuch-Gladwell schemes.
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Numerical simulations of a water quality model in a flooding stream due to dam-break problem using implicit and explicit methods
(2017-02-17)
Subklay, Kanawoot
;
Pochai, Nopparat
The heavy monsoon rains have been drenched flooding along the rivers and reservoirs. The residents try to construct the sandbag dike to protect their village. If the residents have encountered flood for long period, the water pollutant must be increase. The villagers want to drain the water to another areas. The residents of another village are not agree to receive the drained-polluted water from them. The simulation of water-quality is required to compromise these problem. The simulation process of water-quality model is require the input as the water flow velocities after the villagers dike has been destroyed but there is lack of field data on the flooding period. In this research, the dam-break model is used to describe unsteady dike failure flow. A couple of mathematical models is used to simulate water-quality in the problem. The first model is the dam-break model that provides the velocity fields and elevation of water. The second model is the dispersion model that provides the pollutant concentration fields. A modified Lax-diffusive method for solving a dam-break model is proposed. At each step, the flow velocity fields calculated from the first model are the input into the second model as the field data. The explicit and implicit methods are subsequently employed in the dispersion model. This paper proposes a simply remarkable alteration to the Lax-diffusive method, the implicit methods and the explicit methods so as to make it more accurate without any significant loss of computational efficiency. The numerical techniques indicate that this model can be applied for simulation of water-quality in long-term flooding cases are proposed.
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Numerical treatment to a water-quality measurement model in an opened-closed reservoir
(2015-12-01)
Kraychang, Witsarut
;
Pochai, Nopparat
Measuring the water quality in water sources or the Monkey Cheeks Project with opened-closed reservoir. It can be measured by the field measurement, using the water quality monitoring tools and the water quality models consist of hydrodynamic model and dispersion model, to calculate the quality of the water. Hydrodynamic model, using the shallow water equation as a governing equation, is used to describe the water current, having source of wave maker and bottom topography as the required data, bringing about the elevation and velocities of water. Dispersion model, using the advection-diffusion equation as the governing equation, is used to describe the spread of the pollutant concentration of water, having pollutant concentration at point source and calculated water velocities from the first model as the input data, bringing the time-dependent pollutant concen- tration of water at any point. In this research, the three-dimensional surface fitting technique is employed, the anisotropic bottom topography data is represented by a surface function in the hydrodynamic model, in order to have a more realistic water current and water quality approximations in opened-closed reservoir.

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