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首页> 外文期刊>Journal of the American Water Resources Association >Using Fly Ash as a Marker to Quantify Culturally-Accelerated Sediment Accumulation in Playa Wetlands
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Using Fly Ash as a Marker to Quantify Culturally-Accelerated Sediment Accumulation in Playa Wetlands

机译：用粉煤灰作为标记量化普拉亚湿地的文化加速沉积物积累

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摘要

Wetlands in the Rainwater Basin in Nebraska are vulnerable to sediment accumulation from the surrounding watershed. Sediment accumulation has a negative impact on wetland quality by decreasing the depth and volume of water stored, and the plant community species composition and density growing in the wetland. The objective of this study was to determine the amount of sediment that has accumulated in five selected wetlands in the Rainwater Basin in Nebraska. Soil cores were taken at five or six locations along transects across each wetland. This study used the fly ash, which is generated by coal-burning locomotives that were present generally in the late 1800s and early 1900s, as a marker to quantify the sediment deposition rates. The cores were divided into 5cm sections and the soils were analyzed using a fly ash extraction and identification technique. Results indicate that the average depth of sediment ranged from 23.00 to 38.00cm. The annual average depth of sediment accumulation ranged from 0.18cm/yr to 0.29cm/yr. The annual sediment accumulation rate from both wind erosion and water erosion in these five sampling wetlands was between 1.946 and 3.225kg/m(2)/yr. The results of this research can be used to develop restoration plans for wetlands. The fly ash testing technology can also be applied to other areas with the railroads across the United States.
机译：内布拉斯加州雨水盆地的湿地易受周围流域沉积物的影响。沉积物的堆积通过减少水的蓄积深度和数量，以及湿地中植物群落物种的组成和密度的增长，对湿地质量产生不利影响。这项研究的目的是确定内布拉斯加州雨水盆地中五个选定湿地中积累的沉积物数量。沿每个湿地的样带在五个或六个位置取土芯。这项研究使用了通常在1800年代末和1900年代初存在的燃煤机车产生的粉煤灰作为量化沉积物沉积速率的标志。将岩心分成5cm的部分，并使用粉煤灰提取和鉴定技术对土壤进行分析。结果表明，沉积物的平均深度在23.00至38.00厘米之间。年平均沉积物沉积深度在0.18cm / yr至0.29cm / yr之间。在这五个采样湿地中，由于风蚀和水蚀造成的年沉积物累积速率在1.946和3.225kg / m（2）/ yr之间。这项研究的结果可用于制定湿地恢复计划。粉煤灰测试技术也可以应用于遍及美国的铁路的其他地区。

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