Graduate Thesis Or Dissertation

Disposal of sandy pipeline dredge spoils by end dumping

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  • Channel maintenance operations in the rivers and harbors of the United States annually require the disposal of over 320 million cubic meters of dredge spoils. As the availability of suitable land sites diminishes, open water disposal presents an attractive yet controversial alternative method. For open water disposal to be acceptable, the fate of the spoils which are discharged in the water must be predictable. The study described in this thesis was an effort to examine the validity, in field conditions, of an analytical model for predicting hydraulic dredge spoil fate. The analytical model was developed as part of an earlier laboratory study of open-water .dredge spoiling. The model employs the vector sum of spoil particle settling velocity and forward velocity in the water to compute particle trajectory for sand spoils. The forward velocity was determined by superimposing the ambient velocity of the receiving water upon the velocity induced by the dredge pipeline discharge. Investigation of the model in field conditions was accomplished by sampling sediment in the spoil plume from an operating hydraulic dredge, and comparing the data gathered with model predictions. The results obtained indicate the analytical model proposed is a usable means of locating spoil areas in dredging operation planning.
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