Dredging

About: Dredging is a research topic. Over the lifetime, 3300 publications have been published within this topic receiving 28325 citations.

Influence of harbour construction on mud accumulation in the Scheldt estuary

Abstract: The bottom sediments of the turbidity maximum area of the Scheldt estuary were mapped in 1999 using echo sounding, sidescan sonar and grain-size analyses of bottom sediments Four sediment types, sand, muddy sand, sandy mud and mud were recognised Mud, with very little sand, occurs mainly in the access channels to the sluices giving access to the harbour docks of Antwerp The sediments of the main channel have a sandier texture One might conclude that the total mud stock in the middle estuary has increased, both between 1964–1986 and 1986–1999, but on the contrary the mud supply from the river, the mud stock in the river channel and the mud supply to the lower estuary have all decreased The increase in the mud stock in the area as a whole was completely at the expense of mud deposition in the access channels to the sluice gates giving access to the harbour of Antwerp The mud stock in the river channel decreased over the years because of a decreasing mud supply from the river The mud stock in the rive

Method for treating deposits

Abstract: In a device for treating deposits, in particular sediments from dredging waters, the material to be treated containing its inorganic (stones, gravel, sand etc.) and organic (wood, roots, etc.) constituents is classified in sequential stages. To increase the throughput with saving of energy, a dewatering screw 12 is provided for the second stage.

Processes and mechanism of effects of sludge dredging on internal source release in lakes

Abstract: Simulated research of internal loading and collecting and analyzing the samples from the lakes were carried out before and after dredging in polluted suburb lakes, Wuli Lake (Wuxi City) and Xuanwu Lake (Nanjing City). The research results showed that dredging can inhibit internal loadings in a certain degree in a short term. The discrepancy of dredging effect and technical level, namely dredging quality, by different dredging methods will result in a difference of control of lake internal loadings. The internal loadings' reversion will gradually appear along with the biogeochemical processes, including suspended particle precipitation, hydrodynamic disturbance and microbio-transformation. The reversion rate mainly depends on the dredging method and the change of interfacial processes on the newborn surface layer. The higher nutrient contents and organic matter in the sediment will enhance water-sediment interfacial processes and nutrients regeneration. It is very important to study the physicochemical and biological character of lacustrine sediments before dredging for determining the dredging methods and predicting their environmental effect.