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|Title:||Houston-Galveston navigation channels, Texas project; navigation channel sedimentation study, phase 2|
|Authors:||Tate, Jennifer N. (Jennifer Noelle), 1978-|
Berger, Rutherford C.
Houston-Galveston Ship Channel
|Publisher:||Coastal and Hydraulics Laboratory (U.S.)|
Engineer Research and Development Center (U.S.)
|Series/Report no.:||ERDC/CHL TR ; 08-8.|
The U.S. Army Engineer District, Galveston, recently enlarged the Houston Ship Channel in depth and width. Preliminary evaluations of the enlarged channel indicate a higher than anticipated rate of deposition in the channel reach near Atkinson Island. A Coastal and Hydraulics Laboratory investigation (Tate and Berger 2006) was charged with determining if this higher deposition rate is a permanent feature or only a temporary issue. A preliminary study focused on the change in currents, as determined by the model, from the pre-enlarged channel to the new configuration and a sediment tracer analysis. The results of this study determined that the dredging should have been only about 20-30 percent higher than for the pre-enlarged channel. This implies that the large increase is due to other considerations, such as dredge disposal escape, channel dimension equilibrating, or vessel impacts on the shoaling. This preliminary study used the sediment model in an unvalidated state for early results to aid planning. In addition to an unvalidated model, other limitations were that the sediment pathways and loadings were not modeled but assumed. A more general validated tool will be able to estimate the causes of the shoaling with the enlarged channel and suggest approaches to reduce the deposition rate. A full sediment model of the area will be useful to direct decisions to try to reduce dredging and dredging costs. Knowing that there are many factors that contribute to sediment transport, the logical next step is to develop and validate the sediment model. With a validated sediment model, testing and decision making can be made while considering many factors simultaneously. This report presents the sediment model validation process and comparison of the model to field data. The end result is a model that is capable of reproducing tides, circulation, salinity, and sediment transport in Galveston Bay.
|Appears in Collections:||Technical Report|