A Seminar On Recent Sediment Flux and its Implications to River and Delta Management in the GBM System

Date: April 3, 2018

A seminar on ‘Recent Sediment Flux and its Implications to River and Delta Management in the GBM System’ was held on 3rd April, 2018 at 3.30 PM at the Institute Building of BUET. Prof. Md. Munsur Rahman IWFM, BUET was the key speaker. Along with the faculty members of IWFM the key personals from different organizations, such as, BWDB, Dept. of Bangladesh Haor and Wetland Division, LGED, CEGIS, BEPZA participated in the seminar. This seminar was mainly on the sediment issues of GBM delta which were investigated through several nationally & internationally collaborative research projects namely ESPA Deltas, DECCMA, SATPRES, WARPO and BELMONT Forum of IWFM, BUET. The key findings of the seminar are as follows:

Sediment Flux and its implication to river and delta management in the GBM system is a critical issue of this age. The physical sustainability of riverine and deltaic environment is very much sensitive on the volume of water and sediment coming through upstream rivers and the way these fluxes recirculate within the delta system. In most of the planning doc

uments in Bangladesh, the total sediment flux is assumed as a constant value of around 1 billion tones per year. From recent model studies, the increasing trend of sediment flux are found for future climate change scenarios. But the historical time series data shows a decreasing trend of sedimentation which is around 750 MT/year in recent time. Studies on the total sediment load in the Ganges and the Brahmaputra show that the bed load is even decreasing in a higher rate than suspended load. This issue was one of the main features of this seminar. The sediment data scarcity issue has been identified too. Besides, the importance of this sediment flux in offsetting the future SLR (Sea Level Rise) and land subsidence has been discussed rigorously. The opportunities of using this sediment flux in River and Delta management have been discussed. Besides, special attention on the discussion/ negotiations on the sediment flux together with water sharing has been emphasized for reducing the damming effect at the upstream neighboring countries.