土木工程學系Shih, Shang-ShuShang-ShuShihLee, Hong-YuanHong-YuanLee2008-03-072018-07-092008-03-072018-07-092007-02http://ntur.lib.ntu.edu.tw//handle/246246/64173By selecting fish as the indicator specie, the variations of fish habitat area ad diversity between flooding and normal discharge period were investigated in this study. Meanwhile a quasi-two-dimensional model, NETSTARS, and a horizontal two-dimensional model, TABS-2, were employed to simulate the hydraulic characteristics of the Lan-yang Estuary in the presence and absence of the groyne. Both fixed-bed and mobile-bed conditions were investigated. WUA method was also used to evaluate the fish habitat improvement efficiency by combining the numerical modeling results and fish suitability curve. In the flooding period, installing groyne will increase the slow-velocity area that can enlarge the refuge area for fish. The effects of sediment transport in the mobile case show that increased sediment deposition would reduce fish habitat area, a finding that is integral to effective long-term habitat management. Adversely, the results in the normal discharge period show that the fish habitat area will increase without groyne. If the flooding risks are not taken into account, the simulation provided the fish habitat area will expand with the less number and the shorter length of groyne.118401 bytesapplication/pdfen-USnumerical model, groyne, WUA, fish habitat improvement, sediment transportjournal articlehttp://ntur.lib.ntu.edu.tw/bitstream/246246/64173/1/Using groyne to improve fish habitat diversity in tidal estuary, 6th International Symposium on Ecohydraulics.pdf