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Title: Investigation of mathematical models for the physical fate prediction of dredged material
Authors: Johnson, Billy H.
Keywords: Aquatic environments
Dredging spoil
Mathematical models
Publisher: U.S. Army Engineer Waterways Experiment Station.
Series/Report no.: Technical Report (Dredged Material Research Program (U.S.)) ; no. Technical Report D-74-1
Abstract: A literature search of technical journals coupled with contacts with other research groups has revealed that very little mathematical modeling of the physical fate of dredged material disposed of in an aquatic environment has been undertaken. The most significant modeling effort that has been found is a mathematical model for prediction of dispersion and settling in barged ocean disposal of wastes developed by R. C. Y. Koh and Y. C. Chang. This model allows for disposal of dredged material by instantaneous bottom dump as well as pumping the material through a pipe under a moving barge. In both disposal operations, the material is traced through three possible phases; namely, convective descent, dynamic collapse, and long-term diffusion. The dynamic collapse is also generalized to account for the possibility that the cloud hits the bottom. The major limitations of the model appear to be: (a) The model was strictly developed to study disposal in an ocean environment; and (b) There has been only limited laboratory and no field verification of the model; however, it should be noted that the model is conceptually well designed. For estuarine and riverine environments, no models capable of tracing dredged material from its initial release into the water column until it is stored on the bottom have been found. However, for the riverine environment, Schroeder and his associates at Oregon State University are currently developing a mathematical model for tracing dredged material released by pipeline discharge. The model is based upon pipeline discharge velocity, ambient fluid velocity, and particle settling velocity. Additional information should be obtained concerning the development and verification of this model to assess its applicability. As a result of the investigation of identified models and relevant transport studies, the following recommendations are offered: (a) In the ocean environment, sensitivity analyses and field verification of the Koh-Chang model are needed; (b) Model development in the area of predicting the short-term fate of dredged material in the vicinity of the disposal site is needed for the estuarine environment; and (c) No model development is recommended for the river disposal problem until further investigation of Schroeder's work is completed.
Description: Technical Report
Gov't Doc #: Technical Report D-74-1
Rights: Approved for Public Release; Distribution is Unlimited
Size: 88 pages / 8.949 Mb
Types of Materials: PDF/A
Appears in Collections:Technical Report

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