. Effects of gravel morphology on fine sediment accumulation and survival of incubating salmon eggs. Salmon; Sedimentation and deposition Research. term experiments, fine sediment is less than mm) were then added at the weir entrance, and the steady rate of flow maintained for 3 hours. The gravel-filled cans were then removed, oven-dried, and weighed to determine the amount of added sediment which accumulated during the duration of flow. Preliminary tests indicated that if these experiments were run at decreasing discharge rates, the "erosion pave- ment" or "rock armor"
. Effects of gravel morphology on fine sediment accumulation and survival of incubating salmon eggs. Salmon; Sedimentation and deposition Research. term experiments, fine sediment is less than mm) were then added at the weir entrance, and the steady rate of flow maintained for 3 hours. The gravel-filled cans were then removed, oven-dried, and weighed to determine the amount of added sediment which accumulated during the duration of flow. Preliminary tests indicated that if these experiments were run at decreasing discharge rates, the "erosion pave- ment" or "rock armor" developed on the gravel surface was adequate to preclude fine sediment transport in the channel and into the cans prior to addition of the finer sediment. Disturbance resulting from burial of the sample cans was kept to a minimum and is not believed to have appreciably affected the sediment measurements. Long Term Fine Sediment Accumulation and Salmon Egg Survival Ten stainless steel-mesh cylinders, each 4 cm deep and cm in diameter were fabricated to serve as artificial "redds" (fig. 6). Three gravel types were used in this portion of the study: 1) Round, stream-washed gravel to cm in diameter, composed primarily of argillite and greenstone. 2) Broken angular gravel, to cm in diameter, composed mainly of quartzite. 3) Natural gravel from East Creek, which was made up of the above types and which was somewhat platy in form. The round and angular gravels were the same type as those used in the short term fine sediment accumula- tion tests (in the long term experi- ments, fine sediment is less than mm).. 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 Meehan, William R. cn; Swanston, Douglas N; Pacific Northwest Forest and Range Experiment Station (Portland, Or.
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