Interpolation of Fluvial Morphology Using Channel-Oriented Coordinate Transformation: A Case Study from the New Jersey Shelf
Interpolation of Fluvial Morphology Using Channel-Oriented Coordinate Transformation: A Case Study from the New Jersey Shelf
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使用面向河道的坐标变换插值河流形态：新泽西陆架案例研究
DOI：
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发表时间：
2004
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通讯作者：
S. Nordfjord
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作者：
J. Goff;S. Nordfjord
我们提出了一种新的方法来插值通道形态，该方法结合了从地理到基于通道的坐标系统的转换。变换空间中的插值可以通过通道方向的任何变化来强制执行形态的下游连续性和边缘描绘。转换由“通道中心线”引导，该中心线通过地理空间近似地跟踪通道的路径；坐标以沿中心线和穿过中心线的距离表示。精确的插值需要足够的轨迹线密度来明确地跟踪从一条轨迹线到下一条轨迹线的通道。通过首先沿着由信道thalweg和边缘定义的路径（必须由用户选择）以及沿边缘和thalweg之间的若干中间路径进行插值，确保信道连续性。每个通道完成的插值转换回地理坐标，并通过最大深度准则处理通道合流。该方法仅应用于新泽西陆架上用高分辨率啁啾地震数据绘制的浅埋河道，但应适用于更广泛的陆上和地下河流系统。
We present a new methodology for interpolating channel morphology that incorporates a transformation from geographic to channel-based coordinate systems. Interpolation in the transformed space enables enforcement of downstream continuity of morphology and edge delineation through any changes in channel direction. The transformation is guided by a “channel center line,” which approximately tracks the path of the channel through geographic space; coordinates are given in distance along and across the center line. Accurate interpolation requires a track line density sufficient to unambiguously trace channels from one track line to the next. Channel continuity is ensured by first interpolating along paths defined by the channel thalweg and edges, which must be chosen by the user, and along several interim paths between the edges and thalweg. The completed interpolations for each channel are transformed back into geographic coordinates, and channel confluence is handled through a maximum depth criterion. The method is applied here to shallowly buried channels mapped with high-resolution chirp seismic data on the New Jersey shelf, but should be applicable to a wide range of subaerial and buried fluvial systems.