Physical Habitat Simulation with ANFIS Method

This study presents physical habitat simulations to investigate the impact of weir removal on the composition of fish community in a river. The study site is a 900 m long reach in the Gongneung-cheon Stream in Korea, at the middle of which the weir was located. Fish monitoring revealed that lentic fishes were dominant before the weir removal, however lotic fishes became dominant after the weir removal. The ANFIS method, a data-driven method, was used for the habitat simulation with River2D for hydraulic simulation. The distribution of highly suitable portion for each fish species were given before and after weir removal. It was shown that the physical habitat simulation successfully predicts the change in the composition of fish community after the weir removal. The simulated results were compared with those from the knowledge- based model.