DE-Lecture03-Tyoes-of-Projects

DE-Lecture03-Tyoes-of-Projects - Dredging Engineering...

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Unformatted text preview: Dredging Engineering Dredging Engineering Lecture 03 Lecture 03 Types of Dredging Projects Types of Dredging Projects Luis Prieto-Portar 2010 The Dredging Process: The dredging process consists of the following three stages: Excavation: involves the dislodgement and removal of sediments (soils and/or rocks) from the bottom of the water bodies. Transport of the excavated material : moving materials from the dredging areas to the site of utilization, disposal or intermediate treatment. This is generally achieved by one of the following methods: 1. In self-contained hoppers of the dredgers; 2. In barges; 3. Pumping through pipelines; 4. Using natural forces such as waves and currents. Utilization or disposal of dredged material: in construction projects, dredging is driven by the demand for dredged material. In navigation and remediation dredging, the project is driven by the objective of removing the material from its original place. Currently (2010) the dredging industry mines approximately 120 million metric tons of aggregate sediments, to depths of 100 to 130 meters. Equipment used for dredging: Dredging equipment, can be grouped into the following main categories: Mechanical dredges: are well suited to remove hard material and to work in confined areas. Hydraulic dredges: add large amounts of process water and change the original structure of sediments. Transport methods are pipeline and hopper transport. Other types of dredges : are dredgers built for specific tasks. Auxiliary equipment: is often needed in the dredging process and to transport the dredged material to the final placement site or to increase the production rates. The environmental effects of dredging must be studied and understood before the...
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This note was uploaded on 08/29/2011 for the course CGN 4930 taught by Professor Prieto-portar during the Summer '11 term at FIU.

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DE-Lecture03-Tyoes-of-Projects - Dredging Engineering...

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