Dredging

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

Minimizing dredging disposal via sediment management in New York Harbor

Abstract: The Port of New York/New Jersey is naturally shallow, and therefore dredging is required to maintain depths necessary for navigation. About six million cubic yards of material must be dredged annually to maintain navigation channels and berthing areas. Opportunities for disposal of dredged materials in the metropolitan region are limited. The existing ocean disposal site that has, until recently, received the majority of dredged materials is nearing capacity. Under the new, more stringent, guidance for ocean disposal, a large percentage of the dredged material is not considered acceptable for ocean disposal because of contamination. This paper explores nondredging alternatives to reduce the volume of materials to be dredged, thus reducing the disposal volume. These alternatives include short-term options (e.g., reprofiling operations, in which sediments from high spots in berths are dragged to depressions in lower spots) and long-term sedimentation minimization options (e.g., subsurface berms or air bubblers deployed around berths and interpier areas). These methods require an understanding of sedimentation/circulation patterns of the harbor as a whole and the local area in which the specific methodology may be employed.

Underground pipeline dredging method

Abstract: The invention discloses an underground pipeline dredging method. The underground pipeline dredging method is characterized in that sludge in a pipeline is gathered to a designated position through a pipeline dredging device and then removed out of the pipeline through external force. By means of the underground pipeline dredging method, the dredging effect of the pipeline can be effectively improved, the amount of sludge in the pipeline is greatly lowered, the occurrence ratio of sludge in the pipeline is controlled below 5%, smoothness of the pipeline is ensured, and drainage efficiency of an urban drainage system is improved.

A Calibrated Longshore Transport Model for Richards Bay

Abstract: In order to plan maintenance dredging at the Port of Richards Bay, different studies were carried out. These were to determine the extreme dredging rates required in the long term and to predict quarterly, with the aid of a calibrated longshore sediment transport model, the volumes that should have been dredged and used to replenish the downdrift beaches.

The impact of two newly built port terminals in the eastern Gulf of Finland on sedimentation processes and coastal zone dynamics

Abstract: The natural coastal zone in the Luga Bay and Bjorkezund Strait are characterized by a positive sediment balance. Recent sediment extraction and significant depth increase within the dredging areas in the vicinity of the newly built oil and coal port terminals in Ust-Luga and Primorsk disturb the dynamic equilibrium and sediment balance in the coastal zone. This activity leads to a change in sediment flows, with a high rate of accumulation in ship channels and an increase of coastal erosion.

Assessment of three dredging plans for a wave-dominated inlet

Abstract: Many small wave-dominated inlets are naturally unstable and require regular dredging. To mitigate the costs of these operations, the dredged channels should be designed to bring the inlet close to equilibrium and minimise flood dominance. However, it is often unclear how to optimise the configuration of the channels. This study focuses on a small lagoon on the western Portuguese coast that has been subject to frequent and diverse interventions. A process-based morphodynamic model is applied to compare the dredging plan that has been followed for the last 15 years with two new alternatives. These alternative dredging plans increase the tidal prism and reduce flood dominance, mainly due to the higher channel cross-section. Secondary transverse channels do not affect the morphodynamics significantly. For future dredging operations, it is suggested that the bottom depth of the main natural channel be dredged to chart datum and a secondary channel be added to the previous channel with the same bottom depth and...