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Sustainable Dredging
| 题名： | Sustainable Dredging |
| 作者： | Ray TYSHING |
| 关键词： | Sustainable Dredging; Safe Navigable Waterways |
| 摘要： | The sustainable maintenance of safe navigable waterways for small commercial and public boating facilities through dredging is an ongoing task. This is often undertaken by the local waterways manager as a no cost or low cost to the user. Usually the sites to be dredged involve relatively small dredge volumes and the sites dredged are often managed on a case-bycase basis. Where the dredged materials are suitable as beach fill, the dredge spoil can be usefully pumped to shore to build up the beach. When the waterway interrupts the littoral transport, the dredged spoil can be managed to simulate natural transport processes by pumping sand to the downstream side of the works. GHD has recently assisted a local waterways manager to set up a dredging contract for all sites under their control. The role also includes providing technical advice and annual audit of works to help the authority manage the works. Under the contract 13 sites within Port Phillip Bay and Western Port Bay are dredged by a single contractor for a period of 3 years, with options for further extension of the contract subject to satisfactory performance. This is a major change in operating procedure compared to the piecemeal activities that have occurred in the past. The contractor has been delegated the responsibility to program the works and supply plant and equipment to meet agreed programs. This was initially based on the authority’s survey information, and then their own surveys as the project progressed. The contract commenced in November 2000 and provides to the authority the benefit and security of predictable unit costs for 3 years, an ongoing partnership with an experienced and reliable contractor, up to date dredging equipment for the sites, and predetermined annual dredging programs. The benefits to the contractor are security of tenure and income stream for 3 years, an opportunity to build a relationship with the client, a springboard for other business opportunities in this region, and an excellent marketing reference. The contract calls for a number of sites to be dredged at frequencies, which vary from "on demand" to once every three years. Site conditions vary from ocean swell and high tidal currents in the southern end of Port Phillip Bay, to relatively quiet river entrances subject to short period wind waves and negligible tidal stream. This paper provides an overview of the philosophies and considerations in setting up of the contract, audit considerations, the tender process and currently some of the challenges and difficulties in the implementation. |
| 总页数： | Proceedings of the 30th PIANC-AIPCN Congress. Sydney Australia. 22-26 Sept. 2002. pp8 |
| 报告类型： | 科技报告 |
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