. Coastal hydraulic models. Hydraulic models. Figure 3-42. Columbia River entrance (after Herrmann and Simmons, 1966; Herrmann, 1974). 5 miles, and the average annual maintenance dredging amounts to about to million cubic yards. A 5,30Q-£oot-long jetty B CFig- 3-42) was authorized for the Columbia River entrance to reduce maintenance dredging in the entrance channel. The Wauna-Lower Westport Bar (Fig. 3-5) is located between river miles 41 and 45 on the Columbia River and is considerably upstream from the extent of saltwater intrusion. For the 35- by 500-foot channel, the average annua
. Coastal hydraulic models. Hydraulic models. Figure 3-42. Columbia River entrance (after Herrmann and Simmons, 1966; Herrmann, 1974). 5 miles, and the average annual maintenance dredging amounts to about to million cubic yards. A 5,30Q-£oot-long jetty B CFig- 3-42) was authorized for the Columbia River entrance to reduce maintenance dredging in the entrance channel. The Wauna-Lower Westport Bar (Fig. 3-5) is located between river miles 41 and 45 on the Columbia River and is considerably upstream from the extent of saltwater intrusion. For the 35- by 500-foot channel, the average annual maintenance dredging was about 315,000 cubic yards. Model tests were made to determine the changes in hydraulic and shoaling characteristics that would be effected by en- larging the channel to 40 by 600 feet and to develop an optimum improve- ment plan to minimize the cost of maintenance dredging in the enlarged channel. (6) Purpose of Model Study. The model study was conducted to determine: (a) the need for and to develop optimum plans for rehabilita- tion of existing entrance jetties, (b) the most effective means of reduc- ing the cost of maintenance dredging in the navigation channels, and (c) the effects of the proposed interior channel enlargement from 35 by 500 feet to 40 by 600 feet. (7) The Model. The Columbia River Estuary model reproduced the lower 52 miles of the estuary (see Fig. 3-5) and was constructed to lin- ear scales of 1:500 horizontally and 1:100 vertically. The model (a com- bination fixed- and movable-bed type) was about 560 feet long, 130 feet wide at its widest point, and covered an area of about 48,000 square feet. 27. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hudson, Robert Y. Fort Belvoir, Va. : U. S. Coastal Engineering Research Center ; Springfield, Va. : available from
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