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In this paper, we present an analysis of relationship between the drainage pattetn and structure of the bedrock in the southern Sahyadri that represents a part of the Precambrian Southern Granulite Terrain India We have interpreted the lineaments from shaded relief maps prepared from the Shuttle Radar Topography Mission elevation data. The study area is divided into four blocks and the drainage pattern of each block is compared with the lineaments visually and statistically. Coincidence of the two datasets is quite strong implying a predominant control of structures on the drainage pattern. Drainage pattern is remarkably consistent with the Precambrian structural features like shear zones, metamorphic foliation, axial traces of folds and joints suggesting the dominant control exerted by the Precambrian structures on the present-Day drainage. The drainage divide of the region broadly follows the lithological boundaries. Thus, it can be considered that the large-scale parameters of drainage viz basin shape, size etc are controlled by lithology while the orientation, pattern and length of individual streams are controlled by structural features of the underlying rocks.

Keywords

Structural Control, Drainage Pattern, Precambrian Mountainous Terrain, Sahyadri, Southern Granulite Terrain, India.

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