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- W2318117573 abstract "Dredging practices constitute a challenge for developing and maintaining harbour and fluvial activities. They also present a contamination risk of coastal waters which can affect the ecosystems. The unsuitability and restriction to marine disposal of dredged sediments leads ultimately the managers to provide a treatment ashore because of the great volume to be treated. The first concepts to reduce the considerable amounts of sediment were drawn up. Remediation techniques are available and can remove, reduce, immobilise or confine the pollutants. Selection of these techniques depends upon the management policy being applied at each site. The need for maintaining safely navigable waterways in the most efficient way leads to think about in-situ solution which keeps up the sediments. The nautical bottom concept was developed and implemented in several major ports. This concept however requires dedicated measurements of the rheological conditions. In order to assess the nautical depth for dredged sediments from Le Havre (France) harbour, shearing tests using a rheometer were carried out in laboratory. The computed viscosity curves (flow curves) were derived from measured corresponding shear rate value. These curves show that this mud material will be able to flow when external shear stress exceeds a threshold value which is close to 30 Pa and this mud will lose its internal strength completely at shear stress values of about 150 Pa. This means that in situ sediment conditioning will principally be applicable to this mud (mainly silt) material. The long experience of maintenance dredging in Emden (Germany) port has shown that a highly effective technique to achieve and to keep the navigability of corresponding mud material can be applied." @default.
- W2318117573 created "2016-06-24" @default.
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- W2318117573 date "2015-01-01" @default.
- W2318117573 modified "2023-09-28" @default.
- W2318117573 title "Rheological behaviour of marine sediments for assessing nautical depth" @default.
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- W2318117573 doi "https://doi.org/10.5150/cmcm.2015.022" @default.
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