Khemisara Kulmart. One-dimensional mathematical model of time-dependent salinity measurement and controlling in Chao Phraya river for water supply process. Doctoral Degree(Applied Mathematics). King Mongkut's Institute of Technology Ladkrabang. Central Library. : King Mongkut's Institute of Technology Ladkrabang, 2020.
One-dimensional mathematical model of time-dependent salinity measurement and controlling in Chao Phraya river for water supply process
Abstract:
The main objectives of this research were to develop a mathematical model and use finite-difference numerical techniques to estimate one-dimensional salinity of water along Chao Phraya River and to control salinity intrusion at Samlae Pump Station, located near the estuary of Chao Phraya River. The mathematical model was used to simulate the diffusion and advection of salinity along the river and the salinity intrusion into Chao Phraya River. The results from the salinity transportation and distribution model show that the mathematical equation was acceptably suitable for estimation of salinity values in the Chao Phraya River near Samlae Pump Station. The model was calibrated to find the proper parameters values for this use. This mathematical model was developed to calculate advection and diffusion of salt in water. It was able to do so when there were enough data on the diffusion rate of salt as well as the characteristics of the water passages: cross sectional area, positions of nodes, volume of water flow, salinity dilution rate, dissolution rate and the amount of salt dissolved in each part of a water passage. The estimates from the model were in acceptably good agreement with the actual measured values from the field. The findings from this study can be used as suggestions for setting up some water-management measures to control salinity intrusion along Chao Phraya River and lessen its impact on tap water production for Bangkok Metropolitan in the future.