A Synergic Approach of Dredging Disposal and Extraction of Sand with Reference to Hugli Estuary
The channel leading to the Haldia Dock Complex (HDC) create unpredicted flow field resulting nonlinear sediment transport over critical stretches during different season. Thus, the irregular sediment transport siltation and fall in navigable depth in the shipping channel remained permanent cause of worry. Therefore, maintenance dredging by Trailer Suction Hopper Dredgers (TSHD) is necessary. In the context of dredging-disposal scenario, an innovative synergic dredging disposal treatment plan has been conceptualized to reuse the dredged material by extracting sand through the plants installed on barges and thereafter transport it through waiting barges. This paper deals with the methodology involved in the entire chain of events: dredging by THSD disposal through barges-transport to installed sand washing plants over another big barge-extraction of sand-transfer to waiting barges-supply for industrial use in geotechnical engineering that justifies reuse of materials giving boost to other industry and increases. The entire operation will be on the barge and this will be unique innovative concept applicable for Hugli estuary where the mode of shore disposal could not be taken up due to paucity of land and other occupational hazard. This will also serve the purpose of shore disposal cum silt trap dredging aimed to reduce siltation and recirculation yielding decrease in annual dredging quantity in long run.
