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首页> 美国政府科技报告 >Habitat Development Field Investigations Windmill Point Marsh Development Site James River, Virginia. Appendix F. Environmental Impacts of Marsh Development with Dredged Material: Sediment and Water Quality. Volume I. Characteristics of Channel Sediments Before Dredging and Effluent Quality During and Shortly After Marsh Habitat Development.
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Habitat Development Field Investigations Windmill Point Marsh Development Site James River, Virginia. Appendix F. Environmental Impacts of Marsh Development with Dredged Material: Sediment and Water Quality. Volume I. Characteristics of Channel Sediments Before Dredging and Effluent Quality During and Shortly After Marsh Habitat Development.

机译：栖息地开发实地调查风车点沼泽开发地点弗吉尼亚州詹姆斯河。附录F.用疏浚物质进行沼泽开发的环境影响：沉积物和水质。第一卷。在沼泽生境发育期间和之后的疏浚和污水质量前的河道沉积物特征。

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This volume is the first of a two-volume appendix presenting the results of chemical and sedimentological studies conducted at a dredged material marsh development site located near Windmill Point, on the tidal freshwater James River, 16 km below Hopewell, Virginia. Navigation channel sediments were collected in January 1975, before dredging and marsh development, and described according to their temperature, pH, oxidation reduction potential, percent water, percent volatile solids, particle size composition, mineralogy, and cation exchange capacity. Sediment interstitial water and total sediment concentrations of sulfides and various nutrients and metals were also documented. The relationships between channel sediment characteristics and the chemical quality of effluent leaving the diked marsh development site were studied under three different conditions: (a) in January, 1975--during actual dredging and dredged material disposal for marsh substrate development, (b) during dewatering (2-4 days after the completion of dredged material disposal operations), and (c) in May 1975- 3.5 months after dredging, before the beginning of marsh vegetation planting operations had begun or any extensive natural vegetation development had occurred. Particulate concentrations of chemical substances in the dike effluent during dredging were apparently influenced by oxidation and reduction reactions and solubilization from exchangeable or organic sediment phases. Effluent concentrations were compared with channel sediment concentrations.

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