In this study, virtual confluence of 30°, 45°, 60°, 75° type flowing into main channel was designed to comprehend occlusion phenomenon of the mouth of river, then performed numerical analysis using the RMA-2 and SED2D model of SMS according to application of 40m, 60m, 80m, 100m Training levee corresponding to main channel width ratio. Results of simulations analysis are summarized as follows. Applying appropriate Training levee length determined by numerical analysis results, Training levee dimension for occlusion reduction was studied through the analysis of velocity, water level, bed variation at the Gamchen confluence and Wichen confluence.

This research examined a rainfall-runoff relationship containing linearity by applying radar rainfall to grasp more accurate properties of rainfall. In addition, this research improved accuracy of estimated radar rainfall by applying a G/R(Gauge to Radar) technique compensating estimated radar rainfall through using a ratio relationship between estimated radar rainfall and observed ground rainfall. In order to verify applicability of distributed rainfall-runoff model from radar estimated rainfall, this research constructs a Vflo TM analysis system which is typical distributed rainfall-runoff model and analyzed a discharge aspect while changing the size of a lattice. This research proposed estimation and compensation of radar rainfall as well as the lattice size of distributed rainfall-runoff model.