Application of 2D Morphological Model to Assess the Response of Karnafuli River due to Capital Dredging
Journal of Water Resources and Ocean Science
Volume 2, Issue 3, June 2013, Pages: 40-48
Received: Jun. 23, 2013;
Published: Jul. 20, 2013
Views 2641 Downloads 177
Sarfaraz Alam, Department of Water Resources Engineering, Bangladesh University of Engineering and Technology, Dhaka, Bangladesh
M. Abdul Matin, Department of Water Resources Engineering, Bangladesh University of Engineering and Technology, Dhaka, Bangladesh
The major sea port of Bangladesh is the Chittagong port located on the right bank of Karnafuli river of Bangladesh. This river port is considered as the lifeline of the economic activities of the country due to its increasing trade demand. Many port facilities have been planned to be implemented in future to meet this increasing demand. Due to manmade interventions the river flow becomes interrupted and thereby may cause the change in river morphology. Recently Chittagong Port Authority (CPA) has undertaken 3.5 Mm3 Capital Dredging and 2.5 km long bank protection initiative from 3rd Karnafuli bridge to Sadarghat jetty. This study focuses mainly on the application of 2D mathematical model to assess the response of the river due to such development works on Karnafuli River. Necessary data have been collected from CPA and the model was set using the bathymetry of 2009. The river reach between Kalurghat and Khal no-18 has been selected for the study purpose. Time series discharge and water level data were used as boundary condition at upstream and downstream consecutively. Calibration and validation have been carried out with the recent water level data at Sadarghat and Khal no-10. After hydrodynamic calibration and validation the model was adjusted to match the change in bed level with the observed data. Different hydrodynamic and morphological assessments like variation of velocity, sediment transport and bed level changes have also been studied. It was further used to assess the effect of Capital dredging and Bank Protection near Sadarghat area. Model result shows slight increase in velocity and sediment transport due to project implementation. It also changes the rate of erosion/ deposition at some location of the selected reach. It is hoped that the results of the model simulation will be helpful to suggest the effect of possible future development work to be implemented on this river.
M. Abdul Matin,
Application of 2D Morphological Model to Assess the Response of Karnafuli River due to Capital Dredging, Journal of Water Resources and Ocean Science.
Vol. 2, No. 3,
2013, pp. 40-48.
Alam, S. and Matin, M. A. (2012). "Application of Delft3d mathematical model in the river karnafuli for two dimensional simulation." ICACE 2012-Conference Proceeding,CUET, Chittagong. pp:7
Chittagong Port Authority (CPA 2010a), Capital Dredging and Bank Protection with Jetty Facilities; Report on "Mathematical Model Study on the Effect of 3rd Karnafuli Bridge on the Navigability of Karnafuli River within Port Limit." Dept. of WRE, BRTC, BUET, 2010
Chittagong Port Authority (CPA 2010b), "Mathematical Model study on the Effect of Korean (KEPZ) Project and Karnafuli River- Effect of Construction of a RCC Jetty on the left Bank of Karnafuli in the vicinity of the river." Dept. of WRE, BRTC, BUET, 2010
Chittagong Port Authority (CPA 2010c), Field Survey Report: "Capital dredging and bank protection with jetty facilities from Sadarghat jetty to 3rd Karnafuli bridge", July 2010, pp:32-39
Chittagong Port Authority (CPA 1987), "Mathematical Model Study of the River Karnafuli." Dept. of WRE and IFCDR, BRTC, BUET, 1987
Delft3D-Flow user manual (2011). "Simulation of multi-dimensional hydrodynamic flows and transport phenomena, including sediments." Version 3.15, revision 14499. pp:373,356
DHI, BUET (1990a), "Mathematical Model Study of Pussur-Sibsa River System and Karnafuli River Entrance", Interim Report, Volume 1 and 2
DHI, BUET(1990b), "Mathematical Model Study of Pussur-Sibsa River System and Karnafuli River Entrance", Final Report, ANNEX 1: Collection and Analysis of Data
L.C. van Rijn and D.J.R. Walstra(2003), "Modeling sand transport in Delft3D-Online", WL| Delft Hydraulics, Report, pp:15-17
Schellingerhout, J (2012), "Modeling bio-physical interactions by tube building worm", Bachelor Assignment, Advanced Technology, University of Twente. Pp:17
L.C. van Rijn (1984) "Sediment Transport, Part II; Suspended load transport", Journal of Hydraulic Engineering, vol.110, no.11; pp:1613-1641
Wang, Li ( 2007), "Modelling of Cohesive Sediment Transport in the Maasmond Area", MSc Thesis (WSE-HI.07-18).