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首页> 外文期刊>International Journal of Soil, Sediment and Water >Evaluating the Impacts of Uncertainty in Geomorphic Channel Changes on Predicting Mercury Transport and Fate in the Carson River System, Nevada
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Evaluating the Impacts of Uncertainty in Geomorphic Channel Changes on Predicting Mercury Transport and Fate in the Carson River System, Nevada

机译：评估内华达州卡森河系统中地貌通道变化的不确定性对预测汞迁移和命运的影响

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摘要

The Carson River is one of the most mercury contaminated fluvial systems in North America. Most of its mercury is affiliated with channel bank material and floodplain deposits, with the movement of mercury through this system being highly dependent on bank erosion and sediment transport processes. Mercury transport is simulated using three computer models: RIVMOD, WASP5, and MERC4. Model improvements include the addition of a bank package that accounts for flow history. The rates at which river stages are rising or falling will, in turn, impart time-dependant and vertically variable MeHg concentrations within the channel banks along the Carson River. Also, Lahontan Reservoir’s geomorphic characteristics have been refined along with the explicit tracking of a temporally and spatially varying colloidal fraction. The augmented and refined modeling approach results in more accurate and realistic simulation of mercury transport and fate. An extensive uncertainty analysis, involving characterizing the co-variance of two calibration parameters used to define bank erosion and overbank deposition, will define the degree of expected variation in model predictions relative to limitations posed by available field data.
机译：卡森河是北美受汞污染最严重的河流系统之一。它的大部分汞与河床岸物质和洪泛区沉积物有关，汞在该系统中的移动高度依赖于河岸侵蚀和沉积物的运输过程。使用三种计算机模型来模拟汞传输：RIVMOD，WASP5和MERC4。模型的改进包括添加了一个可记录流量历史记录的银行程序包。河流水位上升或下降的速率反过来将在卡森河沿岸的河道内赋予随时间变化且垂直变化的MeHg浓度。此外，随着对随时间和空间变化的胶体组分的显式跟踪，对Lahontan水库的地貌特征进行了改进。增强和完善的建模方法可以更准确，更实际地模拟汞的迁移和命运。广泛的不确定性分析，包括表征用于定义堤岸侵蚀和堤岸沉积物的两个校准参数的协方差，将定义模型预测相对于可用田间数据造成的局限性的预期变化程度。

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