Environmental Effects of Dredging. Construction of a Shallow-Water Gravel Bar Habitat Using Dredged Material.

摘要

This note provides information on techniques, materials, and equipment necessary to construct a shallow-water aquatic habitat in small to medium-sized rivers using coarse-grained sediments. Two important attributes of flowing water systems (current velocity and substrate type) influence community characteristics, feeding strategies, and density of aquatic organisms (Hynes 197O). Typically in the upper reaches of streams, the substrate consists of cobbles and gravel; in the middle and lower reaches where current velocities are reduced, sands and silts pre-dominate. Darters, minnows, immature caddisflies, and true flies are fast-water inhabitants, whereas bluegill, other sunfishes, aquatic worms, and mosquito larvae are better adapted for slack-water habitats.