Abstract:
The study presented in this thesis focuses on the hydrodynamic and sedimentation assessment of
the Rabnabad Channel in Bangladesh using the Delft3D model. It examines a 134 km section of
the channel, including a 75 km dredging line, to understand hydrodynamic and morphological
changes. The primary focus of the research is to simulate and analyze hydrodynamic and sediment
transport phenomena within the channel. Utilizing data from 2023, including bathymetry, water
level, discharge, and sediment data provided by the Payra Port Authority, the study seeks to
understand the significant variations in water level, velocity, and discharge from upstream to
downstream, especially under tidal influence.
The Delft3D modeling system, renowned for its capacity to simulate complex hydrodynamic
behaviors influenced by tides, rivers, winds, and coastal currents, is employed to execute this task.
The study utilizes the software's FLOW module for simulating hydrodynamic flow, which solves
unsteady shallow water equations in both two and three dimensions. This has allowed for the
analysis of flow conditions, sediment transport, and morphological developments in the channel.
One key aspect of this research has been the calibration and validation of the Delft3D model
against real-world data. This step has been crucial to ensure the accuracy and reliability of the
model's predictions. The study acknowledges the limitations of mathematical models and
emphasizes the importance of comparing model results with actual field data to avoid drawing
incorrect inferences.
In conclusion, the study provides valuable insights into the hydrodynamic and sedimentation
characteristics of the Rabnabad Channel, contributing significantly to the understanding of its
behavior and aiding in effective channel management and maintenance strategies. The application
of the Delft3D model in this context demonstrates its versatility and effectiveness in
hydrodynamic and sediment transport modeling.
