The numerical simulations were performed to analyze the advection-diffusion processes of dredging-induced turbidity plume
using RMA2 and RMA4 models in Bunam reservoir, Seosan, Chungnam. Field survey was also performed to measure the
turbidity using the multi water quality monitoring system (YSI6600EDS). In the field survey, the vertical and horizontal
distributions of the turbidity were measured during the dredging operation in Bunam reservoir. RMA2 model was used to
simulate the velocity distributions in both the whole domain and the 2nd part of Bunam reservoir. RMA4 model was also
used to simulate the concentration distribution in only the 2nd part of Bunam reservoir, where the dredging work were
conducted. The comparison of the simulation results with the field data for the advection-diffusion of the turbidity plume
using the concentration ratio concepts shows that the numerical model can be applied to analyze the environmental impact
of dredging works.