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首页> 外文期刊>Carbonates And Evaporites >Spring distributions and relationships with land cover and hydrogeologic strata in a karst landscape in Winona County, Minnesota, USA
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Spring distributions and relationships with land cover and hydrogeologic strata in a karst landscape in Winona County, Minnesota, USA

机译：美国明尼苏达州威诺纳县喀斯特地貌的春季分布及其与土地覆盖和水文地质层的关系

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摘要

Karst aquifers are important groundwater resources, but are vulnerable to contamination due to relatively rapid subsurface transport. Springs, points where the landscape and water table intersect and cold groundwater discharges, link aquifer systems with land surfaces and water bodies. As such, in many regions, they are critical to the viability of lakes, streams and cold-water fish communities. An understanding of where springs are located is important to watershed, fishery and environmental management efforts in karst regions. To better understand spatial distribution of springs and as a potential method for identifying variables that characterize locations of springs for improved land and watershed management, a nearest-neighbor analysis and a discriminant function analysis (DFA) of springs were conducted in Winona County, Minnesota, USA, a karst landscape. Nearestneighbor analysis examined the spatial spring distribution. Twenty-two variables describing the locations of springs were analyzed to ascertain their ability to discriminate correct aquifer unit or bedrock unit classification for each spring. Springs were clumped with the highest densities in the lowest elevations. Springs were correctly assigned to aquifer units and bedrock units with eight and 11 landscape variables, respectively. Forest land cover was the only land cover type contributing to spring discrimination. Consideration of upland human activities, particularly in forested areas, on spring discharge along with a better understanding of characteristics describing spring locations could lead to better management activities that locate and protect springs and their important contributions to regional ecohydrology.
机译：岩溶含水层是重要的地下水资源，但由于地下运输相对较快，因此容易受到污染。泉水是景观和地下水位相交的地方，地下水流很冷，将含水层系统与地面和水体联系起来。因此，在许多地区，它们对于湖泊，溪流和冷水鱼类群落的生存能力至关重要。了解泉水的位置对于喀斯特地区的流域，渔业和环境管理工作非常重要。为了更好地了解弹簧的空间分布，并作为一种确定弹簧位置特征的变量的潜在方法，以改善土地和流域管理，在明尼苏达州的威诺纳县进行了弹簧的最近邻分析和判别函数分析（DFA），美国，岩溶景观。最近邻分析检查了空间弹簧分布。分析了描述弹簧位置的22个变量，以确定它们区分每个弹簧的正确含水层单位或基岩单位分类的能力。泉水丛生，密度最低，海拔最高。分别正确地将弹簧分配给具有8个和11个景观变量的含水层单元和基岩单元。森林土地覆盖是造成春季歧视的唯一土地覆盖类型。考虑春季排放时的高地人类活动，特别是在森林地区，以及对描述春季位置的特征有更好的理解，可能会导致更好的管理活动来定位和保护春季及其对区域生态水文学的重要贡献。

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