flood speed
1.The tidal current in this sea area is reversing current, and the duration of flood current is short than that of ebb current. During the spring, summer and winter, the averaged ebb current speed is greater than the averaged flood current speed. The maximun current speed reaches 1.82 m/s, occurring in summer, and the averaged current speed is 0.7 m/s.
2.In this paper, the characteristics of tidal current distribution in Zhapu section of Hangzhou Bay are analyzed and discussed, using the synchronous observed tidal current data obtained from 8 stations of Zhapu section during September, 2000. The results show that in the section, two current cores with a greater speed occur at flood race, the current speed in the southern part is greater than that in the northern part, and the flood current speed is greater than the ebb current speed.
7.Due to issues of Dongting lake districts flood composition, the evolution of sediment flow, the river and lake (R&L) distribution characteristic as well as the layout of R &L-dredging engineering, the article simulated the model of the Dongting Lake terrain change by using the GIS technology and adopted the limited volumetric method to establish the two-dimensional hydraulics computation model of lake in order to forecast the water level, the flow capacity, the speed of flow and changes of flow field after implemented the project, which have provided the reliable theoretic basis for the decision-making and implementation of renovation for river course, canal and harbor and river course-dredging engineering.
