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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >The effect of bidirectional flow on tidal channel planforms
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The effect of bidirectional flow on tidal channel planforms

机译：双向流动对潮汐通道平面的影响

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Salt marsh tidal channels are highly sinuous. For this project, field surveys and aerial photographs were used to characterize the planform of tidal channels at China Camp Marsh in the San Francisco Bay, California. To model the planform evolution, we assume that the topographic curvature of the channel centreline is a key element driving meander migration. Extraction of curvature data from a planimetric survey, however, presents certain problems because simple calculations based on equally distanced points on the channel axis produce numerical noise that pollutes the final curvature data. We found that a spline interpolation and a polynomial fit to the survey data provided us with a robust means of calculating channel curvature. The curvature calculations, combined with data from numerous cross-sections along the tidal channel, were used to parameterize a computer model. With this model, based on recent theoretical work, the relationship between planform shape and meander migration as well as the consequences of bidirectional flow on planform evolution have been investigated. Bank failure in vegetated salt marsh channels is characterized by slump blocks that persist in the channel for several years. It is therefore possible to identify reaches of active bank erosion and test model predictions. Our results suggest that the geometry and evolution of meanders at China Camp Marsh, California, reflect the ebb-dominated regime.
机译：盐沼的潮汐通道高度弯曲。对于该项目，现场调查和航拍照片被用来表征加利福尼亚旧金山湾中国营沼泽地潮汐通道的平面形式。为了模拟平面形状的演化，我们假设通道中心线的地形曲率是驱动河曲迁移的关键因素。然而，从平面测量中提取曲率数据存在某些问题，因为基于通道轴上等距点的简单计算会产生数值噪声，从而污染最终曲率数据。我们发现，样条插值和多项式拟合到调查数据为我们提供了一种计算通道曲率的可靠方法。曲率计算与潮汐通道中许多横截面的数据相结合，可用于对计算机模型进行参数化。该模型基于最新的理论工作，研究了平面形状与曲折迁移之间的关系以及双向流动对平面演化的影响。盐沼河道的堤岸倒塌的特征在于坍塌块在河道中持续了数年。因此，有可能确定活跃的河岸侵蚀范围并测试模型预测。我们的研究结果表明，加利福尼亚中国沼泽地的蜿蜒曲折的几何形状和演化反映了退潮统治时期。

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