Determination of channel length and tidal storage dimensions to support the tidal driven water circulation process in terantang reclamation unit

Abstract

Land reclamation efforts are still experiencing several obstacles, including the accumulation of toxic concentrations in the reclamation channel. The main influencing factors are tidal force, channel length, and tidal water storage dimensions. Simulation using the EFDC (Environmental Fluid Dynamic Code) was used to analyze these problems. This research was conducted on primary-secondary channels in Terantang reclamation unit in South Kalimantan, Indonesia. The first stage is the identification of hydrodynamic and water quality conditions, followed by modeling. The final stage is the simulation of flow patterns, water age, and dissolved iron concentration for several scenarios of channel length and tidal storage dimensions. The results showed that the simulation with 75% of the channel length with standard tidal storage provided an adequate water circulation pattern and water age, although it still had accumulated dissolved iron concentrations at the tidal storage. Better results for water circulation patterns, water age, and accumulation patterns of dissolved iron concentration were obtained at 50% of the channel length, but must be accompanied by adjustments to the tidal storage dimensions to 50% of the initial depth. All simulation results without using tidal storage show the accumulation of dissolved iron concentrations at the end of the channel which is indicated by the occurrence of water circulation patterns that are not in line with tidal patterns, and high water age.