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首页> 外文期刊>Journal of the American Water Resources Association >CHANNEL ROUGHNESS IN NORTH CAROLINA MOUNTAIN STREAMS
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CHANNEL ROUGHNESS IN NORTH CAROLINA MOUNTAIN STREAMS

机译：北卡罗莱纳州山脉的通道粗糙度

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摘要

Channel roughness, often described by Manning's n, is used to represent the amount of resistance that flow encounters, and has direct implications on velocity and discharge. Ideally, n is calculated from a long-term record of channel discharge and hydraulic geometry. In the absence of these data, a combination of photo references and a validated qualitative method is preferable to simply choosing n arbitrarily or from a table. The purpose of this study was to use United States Geological Survey (USGS) streamflow data to calculate roughness coefficients for streams in the mountains of North Carolina. Five USGS gage stations were selected for this study, representing drainage areas between 71.5 and 337 km~2. Photo references of the study sites are presented. Measured discharges were combined with hydraulic geometry at a cross-section to calculate roughness coefficients for flows of interest. At bankfull flow, n ranged between 0.039 and 0.064 for the five study sites. Roughness coefficients were not constant for all flows in a channel, and fluctuated over a large range. At all sites, roughness was highest during low-flow conditions, then quickly decreased as flow increased, up to the bankfull elevation.
机译：通道粗糙度通常用曼宁（Manning）的n来描述，用来表示流遇到的阻力量，并直接影响流速和流量。理想情况下，n是根据通道流量和水力几何形状的长期记录计算得出的。在没有这些数据的情况下，最好将照片参考和经过验证的定性方法相结合，而不是简单地从表中随意选择n。这项研究的目的是使用美国地质调查局（USGS）的流量数据来计算北卡罗来纳州山区河流的粗糙度系数。本研究选择了五个USGS量规站，代表了71.5至337 km〜2之间的流域。提供了研究地点的图片参考。将测得的流量与横截面的水力几何形状相结合，以计算感兴趣的流量的粗糙度系数。在全部流量下，五个研究地点的n介于0.039至0.064之间。对于通道中的所有流量，粗糙度系数不是恒定的，而是在较大范围内波动。在低流量条件下，所有位置的粗糙度最高，然后随着流量的增加而迅速降低，直至堤岸高度。

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