Author(s): Xinfeng Zhang, Sulan Lu, Yu Jiang, Yaju Wu
Linked Author(s): Sulan Lu
Keywords: maintenance dredging scheme, numerical model, siltation, seasonal dredging, tidal dredging
Abstract: Zhuhai Gaolan harbor is the largest harbor in Huangmao Bay. It shows that upgrade dredging work is the key factor which causes the local serious siltation in the main channel of Gaolan harbor and harms the normal running of channel frequently. Based on a verified numerical model with wave, tidal current and sediment, using the typical hydrological conditions, the paper carries out research on the maintenance dredging scheme for the main channel of Zhuhai Gaolan port. In the paper, compared with no dredging, the effects of dredging in flood season, in dry season, in flood tide, in ebb tide are discussed. It indicates that, with the same dredging boat and the same work hours, dredging in dry season causes higher siltation increase than in flood season. In flood season, the normal siltation rate in the main channel without dredging work is 0. 125 m per month. And it rises to 0. 331 m per month during maintenance dredging, about 88. 4�104 m3 silting amount more in the main channel. And in dry season, the normal siltation rate in the main channel without dredging work is 0. 083 m per month. It rises to 0. 302 m per month during maintenance dredging, about 94. 1�104 m3 silting amount more in the main channel. The differences on siltation between dredging in flood tide and in ebb tide are simulated both in flood season and in dry season. The conclusions reach an agreement. Dredging in flood tide causes higher rising rate of siltation whatever the season. In flood season, the amount of additional siltation in the main channel during dredging in ebb tide is 59% less than dredging in flood tide. And in dry season the discrepancy is about 65%. It concludes that dredging during ebb tide in flood season is an optimal maintenance scheme for the main channel of Zhuhai Gaolan harbor
Year: 2017