关键词: 航道整治, 水文情势, 四大家鱼, 产卵场, 周天河段, 长江

Abstract: The study evaluated the impact of hydrologic regime change induced by waterway regulation project on the spawning ground of four major Chinese carps. The investigation was made on the spawning grounds at Zhoutian section of Jingjiang reach in Yangtze River．The flow regime, the water level, the flow velocity and other hydrologic conditions of this section were predicted and analyzed by using the two-dimensional hydrodynamic model．The results showed that after waterway regulation, the water level change was -0.01~0.01m and the flow velocity change was -0.1~0.15m/s, which would not affect flow regime during the spawning time. The submerged spur dikes led to changes in local velocity and nearby river bed, acting like an artificial fish reef, which was in favor of fertilization and incubation, providing a proper environment for shield, habitat and foraging. The project underwater immersed concrete pieces and riprap complicated the local river bed configuration, however, the influence range and degree was slight.

Key words: waterway regulation, hydrologic regime, four major Chinese carps, spawning grounds, Zhoutian section in Jingjiang River, Changjiang River