Author(s): Sulan Lu, Yu Jiang, Xinfeng Zhang, Yue Li
Linked Author(s): Sulan Lu
Keywords: Numerical study, siltation, main channel, dredging, engineering.
Abstract: Zhuhai Gaolan harbor lies in Huangmao Bay. Severe siltation done irregularly in the main channel is a puzzling problem faced by the harbor recently. Variation characteristics of underwater bottom topography in the main channel during several years are analyzed. Large projects implemented nearby including upgrade of dredging in the main channel, dredger filling engineering, and Tieluwan breakwater construction are also of concern. Choosing the typical hydrological condition, with a 2d numerical models of wave, tidal flow and sediment, the paper simulates and analyzes the normal siltation in the main channel of Zhuhai Gaolan port, and the siltation changes caused by large projects mentioned above. In the simulation, the source intensity of different dredging boat and their position in the construction site are fully considered and represented. The result indicates that, the siltation rate in the main channel is 1. 015m/a normally. Yet, under the upgrade of dredging condition, the siltation in the main channel can increase from 0. 098m per month to 0. 450m per month. The siltation in the area is using grab dredger which increases less sediment comparatively due to the less sediment source. According to the simulation, the dredger filling project, 2km away which is located in the east of the channel with cutter-suction dredger, mainly increases the siltation about 10% in the sub channel nearby. The main channel retains its siltation rate with the increase of 0. 17% only. In addition, the effect of the Tieluwan breakwater construction is also studied. It concludes that, the siltation increases obviously in the south of Tieluwan breakwater. Yet the siltation of main channel decreases about 5. 37% because of the less sediment source and the stronger currents due to the narrower cross-section. To sum up, the upgrade dredging work is the key factor of the severe siltation in the main channel of Zhuhai Gaolan harbor
Year: 2017