4.5 Article

Spatial analysis of stream power using GIS: SLk anomaly maps

期刊

EARTH SURFACE PROCESSES AND LANDFORMS
卷 34, 期 1, 页码 16-25

出版社

WILEY
DOI: 10.1002/esp.1684

关键词

geomorphic indices; rivers; tectonic geomorphology; SLk maps; GIS

资金

  1. Spanish Ministry of Education [CD52006-00041]
  2. [BTE2003-01699]
  3. [CGL2004-03333/BTE]

向作者/读者索取更多资源

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.

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