. Effects of beach nourishment and borrowing on marine organisms. Beaches; Marine animals. Figure 7. Nesting sea turtle. 6. Water and Sediment Quality. Problems with anoxic sediments and nutrient release in the nearshore zone of a high-energy beach as a result of beach nourishment do not appear to be major because the fine materials that are high in organics are generally moved offshore and sulfides are rapidly oxidized. The material remaining on the beach is usually similar or larger in grain size to that before nourishment. High-energy beaches are usually composed of coarse material that all
. Effects of beach nourishment and borrowing on marine organisms. Beaches; Marine animals. Figure 7. Nesting sea turtle. 6. Water and Sediment Quality. Problems with anoxic sediments and nutrient release in the nearshore zone of a high-energy beach as a result of beach nourishment do not appear to be major because the fine materials that are high in organics are generally moved offshore and sulfides are rapidly oxidized. The material remaining on the beach is usually similar or larger in grain size to that before nourishment. High-energy beaches are usually composed of coarse material that allows oxy- genated water to penetrate, preventing the accumulation of sulfides and saturating the sediment pore space with oxygen (Cox, 1976). Although some nutrients may be released into the water as a result of nourishing the beach, they are usually rapidly diluted because of the mixing process. Reilly and Bellis (1978) reported on the use of dredged material from a navigation channel that contained fine material and clay high in organics for beach nourishment. They noted that the release of the fine sediments from the beach temporarily inhibited the reestablishment of the beach macrofauna. However, CERC's studies of using nourishment materials from offshore that is similar to the beach sediments did not find these problems with suspended sediments, anoxic sediment, or excess nutrients. To minimize potential problems, sediments used for beach nourishment should closely match the composition of the natural beach sediments, have a low percentage of fine material, and be low in organic content. McLachlan, et al. (1981) cautioned that because of the species rich- ness of the beach environment and the cellular circulation patterns nearshore, the beach system may be more sensitive to effluents than is readily apparent. 22. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these ill
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