Residence Time Variation by Operation of Sihwa Tidal Power Plant in Outer Sea of Sihwa Lake

Abstract

Regression formulas between the difference of hydraulic head and the rate of interior water volume change, are induced. A three-dimensional numerical hydrodynamic model for the Asan Bay is constructed incorporating a module to compute water discharge through the permeable sea-walls at each computation time step by employing the formulas. Hydrodynamics for the period from 13th to 27th May, 2010 is simulated by driving forces of real-time reconstructed tide with major five constituents(M 2 , S 2 , K 1 , O 1 and N 2 ) and freshwater discharges from Asan, Sapkyo, Namyang and Seokmoon Sea dikes. The skill scores of modeled mean high waters, mean sea levels and mean low waters are excellent to be 96 to 100% in the interior of permeable sea-walls. Compared with the results of simulation to obstruct the flow through the permeable sea-walls, the maximum current speed increases by 0.05 to 0.10 m/s along the main channel and by 0.1 to 0.2 m/s locally in the exterior of the Outer Sea-wall of Inner Port. The maximum bottom shear stress is also intensified by 0.1 to 0.4 N/m 2 in the main channel and by more than 0.4 N/m 2 locally around the arched Outer Sea-wall. The module developed to compute the flow through impermeable seawalls can be practically applied to simulate and predict the advection and dispersion of materials, the erosion or deposion of sediments, and the local scouring around coastal structures where large-scale permeable sea-walls are maintained.

Hydraulic and Ecological Changes Under Drainage Gate Operations With Coupled Model Schism-Cosine in Saemangeum Basin, Korea

“…Jeong et al (2018b) simulated the hydraulic characteristics of the Saemangeum and Mangyeonggang river and Dongjingang river with climate change scenarios using Delft3D model. And Bae et al (2017) simulated the change of residence time in Sihwa lake under gate operation using the Lagrangian Particle Tracking (LPT) model. However, the operation of drainage gates were not represented in their models and downstream conditions were set by historical seawater level data.…”