OTHER INFORMATION

ERDC TN-DOER-N6

March 2000

OTHER INFORMATION: The position of the barge scows was monitored with Differential

Global Positioning System (DGPS) during transit and placement by an automated disposal surveil-

lance system (ADISS) installed and monitored by Science Applications International Corporation

of Newport, RI. The system provided an aid to operators for accurate positioning of the barges for

placement. The ADISS recorded the draft of the barges to determine the actual time of release of

the material from the barge (i.e., at the time of release, the draft of the barge changed quickly). The

data will be used for verification of MDFATE.

CONCLUSIONS: At this point, the mound has remained essentially intact. While the climate has

been mild during the monitoring period, it is still surprising that the mound has changed little given

the fine-grained nature of the material. However, the cohesiveness of the material is significant as

suggested by the peaked features in the mound. Laboratory analyses of the material to determine

its erodibility and consolidation characteristics are planned, as well as verification simulations using

LTFATE. That is, LTFATE will be used to couple the hydrodynamic data with observed bathymet-

ric changes and additional sediment analyses to improve the accuracy of the model for predicting

the fate of mixed-sediment dredged material placed nearshore.

POINTS OF CONTACT:

Contact the authors, Mr. Jack E. Davis (601-634-3006,

j.davis@cerc.wes.army.mil), Dr. Donald K. Stauble (601-634-2056, d.stauble@cerc.wes.army.

mil), Dr. Marian P. Rollings (601-634-2952, rollinm@mail.wes.army.mil), or the manager of the

Dredging Operations and Environmental Research Program, Dr. Robert M. Engler (601-634-3624,

englerr@mail.wes.army.mil). This technical note should be cited as follows:

Davis, J. E., Stauble, D. K., and Rollings, M. P. (1999). "Construction and monitoring

of a mixed-sediment mound offshore of Mobile Bay, Alabama," DOER Technical Notes

Collection (ERDC TN-DOER-N6), U.S. Army Engineer Research and Development

Center, Vicksburg, MS. www.wes.army.mil/el/dots/doer

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Hubertz, J. M., and Brooks, R. M. (1989). "Gulf of Mexico hindcast wave information," WIS Report 18, U.S. Army

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Johnson, B. H. (1990). "User's guide for models of dredged material disposal in open water, " Technical Report D-90-5,

U.S. Army Engineer Waterways Experiment Station, Vicksburg, MS.

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Scheffner, N. W., Thevenot, M. M., Tallent, J. R., and Mason, J. M. (1995). "LTFATE: A model to investigate the

long-term fate and stability of dredged material disposal sites; User's guide," Instruction Report DRP-95-1, U.S.

Army Engineer Waterways Experiment Station, Vicksburg, MS.

Stone, G. W., Wang, P., Pepper, D. A., Grymes, J. M., Roberts, H. H., Zhang, X., Hsu, S.A., and Huh, O.K. (1999).

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NOTE: The contents of this technical note are not to be used for advertising, publication,

or promotional purposes. Citation of trade names does not constitute an official endorse-

ment or approval of the use of such products.