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Quantifying fine sediment sources in the northeast branch of the Anacostia River using trace elements and radionuclides.

机译：使用微量元素和放射性核素定量分析Anacostia河东北支的细沙来源。

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Fine sediment sources were characterized in an urban watershed, the Northeast Branch of the Anacostia River, which drains to the Chesapeake Bay. Concentrations of 63 elements and two radionuclides were measured in possible sediment sources and suspended sediment collected at the watershed outlet during storm events. Methodology for selecting tracers was developed so the sediment fingerprinting method could effectively determine the relative quantity of sediment contributed by each source to the suspended fraction. The amount of enrichment of trace elements in sediment sources and suspended sediment was determined by calculating enrichment ratios, which are ratios of the normalized concentration of elements in the sample relative to their average normalized concentration in the Earth's upper continental crust. Streambanks contributed the highest relative quantity of sediment in the fall and spring while upland areas contributed mostly during winter. Street residue contributed 12% on average and was the source most concentrated in anthropogenically enriched elements.

机译：精细的沉积物源的特征是城市流域，即Anacostia河的东北支流，该支流排入切萨皮克湾。在暴风雨期间，测量了可能的沉积物来源和流域出口收集的悬浮沉积物中63种元素和两种放射性核素的浓度。开发了选择示踪剂的方法，以便通过泥沙指纹法可以有效地确定每种来源对悬浮物贡献的泥沙的相对量。沉积物源和悬浮沉积物中痕量元素的富集量是通过计算富集率确定的，富集率是样品中元素的归一化浓度相对于地球上地壳中元素的平均归一化浓度之比。在秋季和春季，河床对沉积物的相对贡献最大，而在冬季，高地地区的贡献最大。街头残留物平均贡献了12％，是人为致富元素中最集中的来源。

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作者
Devereux, Olivia Harcourt.;
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作者单位

University of Maryland, College Park.;

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授予单位 University of Maryland, College Park.;
学科 Geology.;Agriculture Soil Science.
学位 M.S.
年度 2006
页码 104 p.
总页数 104
原文格式 PDF
正文语种 eng
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Quantifying fine sediment sources in the northeast branch of the Anacostia River using trace elements and radionuclides.

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