Suspended sediment estimation using geo-spatial and mathematical modelling techniques in kobadak river

Abstract

Suspended Sediment is one of the most important features of sediment management in river navigation, erosion, dredging, design and operation of hydraulic infrastructure in coastal areas.Due to a lack of upstream flow and obstructions along the floodplain, Kobadak river catchments have faced complex sediment management concerns in recent decades.Regular monitoring to understand sediment dynamics is essential but not currently available. It is applied a 1D hydrodynamic and advection-dispersionmodule (Mike 11) to estimate since the boundary conditions were generated by the reflectance of satellite images where measured data was not available.The Model has been calibrated by observed water levels, discharge and suspended sedimentin 2011 and 2012 respectively. Based on the model for the Kobadak River, the minimum, average, and maximum SSC increase from upstream to downstream. Moreover, the net export-import of suspended sediment at the Kobadak-Shibsa confluence were 1.66 and 1.81 million tons (2011), and 1.32 and 1.50 million tons (2012) respectively. Furthermore, the net sediment deposition for the years 2011 and 2012 were 0.15 and 0.17 million tons, respectively. Approximately 0.09 million tons of suspended sediment have been deposited during the monsoon, which represents 60% of the annual deposit; the remaining 40% has been deposited during the dry and pre-monsoon.Thereafter, Suspended Sediment Estimation using Geo-spatial and Mathematical Modelling Techniques in the Kobadak River considering is the new concepts of suspended sediment movement.It is hoped that the results would help sediment management authorities in addressing sediment related problems through a technical approach.