Measurement of Tidal Fluctuation Using MATLAB-Based Program and Development of Salinity Intrusion Model for Coastal Region of Bangladesh Using VISUAL MODFLOW by B.S. Pushpendue Biswas, Aseya Khatun, Md. Tauhid-Ur-Rahman, Bijit Kumar Banik

Measurement of Tidal Fluctuation Using MATLAB-Based Program and Development of Salinity Intrusion Model for Coastal Region of Bangladesh Using VISUAL MODFLOW 

B.S. Pushpendue Biswas¹,  Aseya Khatun¹,  Md. Tauhid-Ur-Rahman², Bijit Kumar Banik²

Department of Civil and Environmental Engineering, Shahjalal University of Science and Technology, Sylhet, Bangladesh

Abstract: The groundwater in coastal region has got immense attention by different researchers through mainly emphasizing on the dynamic interaction between groundwater and seawater. Due to the increase in development in coastal regions, it is important to ensure proper coastal management and coastal protection techniques in order to avoid various coastal hydro-geological, engineering, and environmental problems such as seawater intrusion, stability of coastal engineering structures, beach dewatering for construction purposes, and deterioration of the marine environment. The study area was selected as Kazibacha under Bathiaghata upazila of Khulna district. The surface water data was collected from Institute of water Modeling (IWM) for Rupsha river, Kazibacha point. Whereas two groundwater well such as well21 (N22041.241, E89031.691) and well22 (N22041.038, E89031.604) were considered for the analysis. Both surface and groundwater data were taken for the duration of 25-03-12 to 31-03-12 with an interval of 10 minutes. The datum for all the data was taken as mean sea level. Two tide components M2 and S2 were used. MATLAB-based software named TIDAL is used in order to analyze the interaction of ground water and surface water based on analytical solutions suggested by Li et. al. (2007). By applying moving average introduced by Serfes (1991) the mean water level of Rupsa river at Kazibacha point was computed as 2.27 m. Based on the software prediction the aquifer properties such as the transmissibility of well21 and well22 was found as 51.8 and 129.5 m2/h respectively and the hydraulic conductivity of well21 and well22 was found as 0.690 m/h and 1.73 m/h respectively which was very close to BWDB report. Moreover the amplitude analysis suggests that the tidal influence of the Rupsha river on the nearby groundwater of the eastern bank might be active within 100 m range. It can further be stated that if the surface water of Rupsha river in any case gets contaminated through salinity intrution or something else then the nearby groundwater within 100 m range might also get effected in different range. Another study is made on salinity intrusion modeling. For this we have choosen the lower Meghna near Raipur upazila (23° 3' 0" North, 90° 46' 0" East) of Lakshmipur district. By using Visual MODFLOW and secondary data a salinity intrusion model is made. Visual Modflow SEAWAT was used as experimental basis to simulate the salt water transport to shallow aquifers. To remove complexity a constant head boundary was assigned to entire model domain. The model simulation was run for 20 years’ time step. Model result shows a rapid transport of salt for first eight years. After eight years salt transport speed is rather slow but gradually the concentration of salt in the next twelve years (in the time scale of 20 years) will reaches the amount which is alarming compared to national standards. From the analysis it is seen that the salinity may cover almost half the area of the aquifer.See more

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