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首页> 外文期刊>Open Journal of Modern Hydrology >Hydraulic Geometry, Hydraulics and Sediment Properties of Forest Brooks after Extensive Erosion from Upland Peatland Drainage
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Hydraulic Geometry, Hydraulics and Sediment Properties of Forest Brooks after Extensive Erosion from Upland Peatland Drainage

机译：高地泥炭地排水造成的广泛侵蚀后森林溪的水力几何形状，水力和泥沙特性

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摘要

Peatland drainage can affect headwater systems, causing changes in bed substrate composition and hydraulic geome-try in small brooks. We studied hydraulic geometry and sediment properties in 14 boreal forest brook reaches (width < 2 m), characterised by well-vegetated banks, high sinuosity and low width-to-depth ratio, in north-east Finland. The aims were to obtain information from channel geometry and to study brook response to extensive sediment load from land use. The results indicate that bed sediment in brooks is almost continuously mobile, which negatively reflect to ecological status of the brooks. These headwater meandering parts have limited sediment transport capacity and require a long period to recover from artificially increased sediment input from peat drainage. However, different reaches can be prioritised for restoration according to the characteristics of silted bed sediment or sediment origins. Brook width appeared to have large natural variation, causing great local velocity variations. This needs to be taken into consideration when restoring straightened reaches in small headwater areas, e.g., width in restored reaches cannot be uniform but should include variations.
机译：泥炭地的排水会影响水源系统，导致小溪的床底物成分和水力几何变化。我们研究了芬兰东北部14个北部森林溪流河段（宽度<2 m）的水力几何结构和沉积物特性，这些河床植被完好，弯曲度高，宽深比低。目的是从河道几何结构中获取信息，并研究溪流对土地利用引起的大量沉积物负荷的响应。结果表明，溪流中的河床沉积物几乎是连续移动的，这对溪流的生态状况产生了负面影响。这些源头蜿蜒的部分的泥沙输送能力有限，需要很长一段时间才能从泥炭排水系统中人为增加的泥沙输入中恢复。但是，根据淤泥床沉积物或沉积物来源的特征，可以优先考虑不同的河段进行修复。布鲁克宽度似乎具有较大的自然变化，从而导致较大的局部速度变化。在较小的上游水源地区恢复伸直的河段时需要考虑到这一点，例如，恢复的河段中的宽度不能统一，而应包括变化。

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