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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Spatial analysis of stream power using GIS: SLk anomaly maps
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Spatial analysis of stream power using GIS: SLk anomaly maps

机译：使用GIS的流功率空间分析：SLk异常图

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摘要

The stream length-gradient index (SL) shows the variation in stream power along river reaches. This index is very sensitive to changes in channel slope, thus allowing the evaluation of recent tectonic activity and/or rock resistance. Nevertheless, the comparison of SL value,; from rivers of different length is biased Clue to the manner in which the index is formulated, thus making correlations of SL anomalies along different rivers difficult. Therefore, When undertaking a comparison of SL values of rivers of different lengths, a normalization factor must be used. The graded river gradient (K) has already been used in some studies to normalize the SL index. In this work, we explore the relationships between the graded river gradient (K), the SL index and the stream power, proposing the use of a re-named SLk index, which enables the comparison of variable-length rivers, as well as the drawing of SLk anomaly maps. We present here a GIS-based procedure to generate SLk maps and to identify SLk anomalies. in order to verify the advantages of this methodology, we compared in SLk map of the NE border of the Granada basin with both simple river profile-knickpoint identification and with all SL map. The results show that the SLk map supplies good results with defined anomalies and suitably reflects the main tectonic and lithological features of the Study area. Copyright (C) 2008 John Wiley and Sons, Ltd.
机译：河流长度梯度指数（SL）显示了沿河段的河流水力变化。该指数对河道斜率的变化非常敏感，因此可以评估近期的构造活动和/或岩石抵抗力。尽管如此，SL值的比较;来自不同长度河流的偏差偏向于该指数的制定方式，因此使得沿不同河流的SL异常之间的关联变得困难。因此，在比较不同长度的河流的SL值时，必须使用归一化因子。已在某些研究中使用渐变河坡度（K）来标准化SL指数。在这项工作中，我们探索了分级河坡度（K），SL指数和河流功率之间的关系，提出了使用重命名的SLk指数的方法，该指数可以比较变长河和河流。 SLk异常图的绘制。我们在这里介绍一个基于GIS的过程，以生成SLk映射并识别SLk异常。为了验证该方法的优势，我们在格拉纳达盆地东北边界的SLk图中比较了简单的河流剖面拐点识别和所有SL图。结果表明，SLk图提供了定义好的异常的良好结果，并适当反映了研究区的主要构造和岩性特征。版权所有（C）2008 John Wiley and Sons，Ltd.

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