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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Characterization of the spatial variability of channel morphology
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Characterization of the spatial variability of channel morphology

机译：通道形态空间变异性的表征

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The spatial variability of two fundamental morphological variables is investigated for rivers having a wide range of discharge (five orders of magnitude). The variables, water-surface width and average depth, were measured at 58 to 888 equally spaced cross-sections in channel links (river reaches between major tributaries). These measurements provide data to characterize the two-dimensional structure of a channel link which is the fundamental unit of a channel network. The morphological variables have nearly log-normal probability distributions. A general relation was determined which relates the means of the log-transformed variables to the logarithm of discharge similar to previously published downstream hydraulic geometry relations. The spatial variability of the variables is described by two properties: (1) the coefficient of variation which was nearly constant (0.13 - 0.42) over a wide range of discharge; and (2) the integral length scale in the downstream direction which was approximately equal to one to two mean channel widths. The joint probability distribution of the morphological variables in the downstream direction was modelled as a first-order, bivariate autoregressive process. This model accounted for up to 76 per cent of the total variance. The two-dimensional morphological variables can be scaled such that the channel width-depth process is independent of discharge. The scaling properties will be valuable to modellers of both basin and channel dynamics. Published in 2002 John Wiley & Sons, Ltd.
机译：对于流量范围广（五个数量级）的河流，研究了两个基本形态变量的空间变异性。在河道连接处（主要支流之间的河段），在58至888个等距横截面处测量了水面宽度和平均深度等变量。这些测量提供数据以表征信道链路的二维结构，该信道链路是信道网络的基本单元。形态变量几乎具有对数正态概率分布。确定了一般关系，该关系将对数转换后的变量的均值与排放的对数相关，类似于先前发布的下游水力几何关系。变量的空间变异性由两个特性来描述：（1）变异系数在较大的放电范围内几乎恒定（0.13-0.42）; （2）下游方向的整体长度尺度大约等于一到两个平均通道宽度。下游方向上的形态变量的联合概率分布被建模为一阶二元自回归过程。该模型最多占总差异的76％。可以对二维形态学变量进行缩放，以使通道宽度-深度过程与放电无关。比例属性对于盆地和河道动力学的建模者将是有价值的。出版于2002年John Wiley＆Sons，Ltd.

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