Browsing by Author "Mahamud, Upal"

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ANALYSIS OF MODELING RESULTS FOR RIVER BANK PROTECTION OF THE MOST VULNERABLE PART OF TAZUMUDDIN UPAZILA UNDER BHOLA DISTRICT
(R&D Wing, MIST, 2009-12) Aziz, Md. Abdul; Alam, Rubayat; Mahamud, Upal; Haque Khan, Zahirul
Bhola is the largest Island of Bangladesh situated in the south central region (latitude approximately from 430000N to 525000N and longitude 555000E to 590000E) of Bangladesh in the highly dynamic Meghna Estuary. In recent years the erosion along eastern shoreline of Bhola Island has become a serious issue. Attempts are taken to establish the base line condition to simulate the natural phenomena. Baseline condition for Tazumuddin Upazilla (under Bhola district) has been developed based on hydrodynamic and morphological modelling and historical data of bank line shifting, thalweg line shifting, bathymetric data, char movement etc. To calibrate and validate the model water levels and discharge are successfully calibrated. From modeling result, erosion/deposition pattern at and outside the protective works, new vulnerable areas due to revetment have been identified. Hydrodynamic (HD) simulations during ebb tide the maximum depth integrated near bank velocity is found within the range of 1.5-3.0 m/s along the riverbank of Tazumuddin and 1.0-1.5 m/s along the riverbank of Lalmohan. Morphological simulation shows the channel is further extended towards the south-east part. Further computational simulation showed that channel in front of Tazumuddin become deeper and it is extended more towards the south-east direction. From bathymetry survey data in May, 05 it is found that there is a tendency to deepen the channel in front of Tazumuddin where protective work was suggested and the deep channel is further extended towards south-east direction like simulation result. So it can be concluded that simulation result and real condition near Tazumuddin follows the same trend of channel development.
EXPERIMENTAL VERIFICATION OF THE INSIDE INTEGRATION METHOD (IIM) FOR THE SIMULATION OF SHALLOW WATER FLOW RUNNING ONTO A SLOPING GROUND
(2015-08-31) Abdul Aziz, Md.; Us Samad, Md Sohail; Mahamud, Upal; Nurul Huda, Md
This study shows the validation of a new numerical scheme with hydraulic experiment. The proposed scheme is a new computational scheme to solve shallow-water equations for surface waves shoaling on a slope. Experiment was carried out in a wave tank set on an oscillating bed, which can be moved, uniformly equal in both directions. Used flume had a flat bed of 50.5 cm and having a constant slope of 11.30 in one end whereas the other end is fixed with a vertical wall. As initial condition, water depth was 2cm, wave period was 3.5 s and the movement of the oscillating bed was 6 cm. From the comparisons of the time variation of the moving boundary and the water level along the tank, numerical computation was found to provide good agreement with laboratory experiments.