|New developments in environmental dredging: from scoop to sweep dredge|
Vandycke, S. (1997). New developments in environmental dredging: from scoop to sweep dredge, in: Waterbouwdag, 5 juni 1997, Holiday Inn Crowne Plaza Hotel, Antwerpen. pp. 1-7
In: (1997). Waterbouwdag, 5 juni 1997, Holiday Inn Crowne Plaza Hotel, Antwerpen. Technologisch Instituut: Antwerpen. different pagination pp., more
The Flemish Community is continuously looking to improve maintenance dredging works through careful selection of dredging and disposal locations and through the use of more efficient dredging equipment. Most sediment pollution consist of fine grained sediments. These sediments tend to settle in the entrance channels to sealocks, in harbour areas or other waterways with low currents. Therefore, special attention has to be paid to maintenance dredging procedures in these areas, in order to reduce both the economic and ecological impact of the removal of contaminated fine grained sediment.
To meet these environmental requirements and to achieve a cost-effective solution, a new type of dredge has been developed in co-operation with the Flemish Institute for Scientific-Technological Research Promotion in the Industry (IWT). This scoop dredge has been successfully tested in the access channel to the Kallo Lock and in the adjacent harbour area. Based on this experience and on environmental dragheads of trailing suction hopper dredges, further breakthrough in environmental dredging has been achieved. The sweep dredge combines the advantages of stationary dredges and trailers. The sweep dredge is able to work in shallow water and to remove very thin layers of polluted fine-grained sediments at high concentrations. The principles of both dredges have been patented worldwide.
This paper will discuss:
- The criteria for dredging and removal of contaminated fine-grained sediments in an economic and ecologically acceptable way.
- The development of the scoop dredge, the results of the dredging operations and the various test and monitoring programmes.
- The development of the sweep dredge and the evaluation of its characteristics.