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首页> 外文会议>Tenth International Conference on Tailings and Mine Waste; Oct 12-15, 2003; Vail, Colorado, USA >Seasonal variation of water chemistry and metals mobility in a watershed affected by acid rock drainage: case study in the Lake Creek Watershed, Colorado
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Seasonal variation of water chemistry and metals mobility in a watershed affected by acid rock drainage: case study in the Lake Creek Watershed, Colorado

机译：受酸性岩石排泄影响的流域中水化学和金属迁移率的季节性变化：科罗拉多州Lake Creek流域的案例研究

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摘要

The Colorado Geological Survey is conducting a NASA-funded study in Colorado's Lake Creek watershed to determine the ability of hyperspectral remote sensing to map mineralogy related to water quality within a hydrothermally altered watershed. Two sampling events were conducted, one during high-flow conditions in May, and one during low-flow (baseflow) conditions in September. Field data include water samples, streambed mineral precipitate samples, and streamflow measurements at each station, along the 20-mile reach starting in Peekaboo Gulch and continuing down Lake Creek to its confluence with the Arkansas River. Hydrothermal alteration zones in four of Lake Creek's tributaries - Peekaboo Gulch, Sayres Gulch, East Sayres Gulch, and La Plata Gulch - are sources of metals to the watershed. Mineral precipitation has occurred over much of the watershed in response to changes in the hydrogeochemical environment, for example by dilution and neutralization caused by influxes of clean tributaries. Preliminary data indicate that the precipitates are composed primarily of aluminum and iron oxyhydroxides, but also include concentrations of other trace metals, such as copper, nickel, and zinc, likely as co-precipitated or sorbed phases. The deposition of mineral precipitates occurs during both high and low flow, and is presumed to continue year-round. However, preliminary findings provide some interesting comparisons of hydrogeochemical characteristics between the two flow regimes. Low-flow conditions exhibit lower pH over a longer reach of the watershed than high flow, which translates to increased metals mobility and in turn deposition of mineral precipitates over a shorter reach of the watershed. Under high-flow conditions, dilution and neutralization occur higher in the watershed, causing mineral precipitation to occur farther upstream than during baseflow. Despite the overall improvement in water quality brought by high flow, the chemical loadings of most constituents increase during high flow. Water quality standards for most constituents are exceeded more frequently during low-flow conditions.
机译：科罗拉多州地质调查局正在美国国家航空航天局（NASA）资助下，在科罗拉多州的莱克克里克（Lake Creek）流域进行研究，以确定高光谱遥感绘制与热液化流域内与水质相关的矿物学的地图的能力。进行了两个采样事件，一个采样事件发生在5月的高流量条件下，一个采样事件发生在9月的低流量条件下。现场数据包括水样本，流态矿物沉淀物样本以及每个站点的流量测量，这些区域从Peekaboo Gulch开始一直到20英里，然后一直沿着Lake Creek一直流到与阿肯色河的汇合处。 Lake Creek的四个支流中的热液蚀变带-Peekaboo Gulch，Sayres Gulch，East Sayres Gulch和La Plata Gulch-是流域中金属的来源。响应水文地球化学环境的变化，例如，由于流入支流而造成的稀释和中和作用，许多流域发生了矿物沉淀。初步数据表明，沉淀物主要由铝和羟基氧化铁组成，但也包括其他痕量金属（如铜，镍和锌）的浓度，很可能是共沉淀或吸附相。矿物沉淀物的沉积在高流量和低流量期间都会发生，并且可能会全年持续。然而，初步发现提供了两种流态之间水文地球化学特征的一些有趣的比较。与高流量相比，低流量条件在分水岭较长的范围内显示出较低的pH值，这意味着金属迁移率增加，进而在较短的分水岭范围内沉积了矿物沉淀物。在高流量条件下，流域中的稀释和中和作用更高，导致矿物沉淀比基流过程更向上游发生。尽管高流量带来了水质的整体改善，但大多数成分在高流量过程中的化学负荷却增加了。在低流量条件下，大多数成分的水质标准被频繁地超过。

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