Landform evolution of the Nayar basin Garhwal Himalaya, Uttarakhand

Evolution of landform of the Nayar basin in the Garhwal Himalaya is a unique landform-ecosystem. It is due to diversity in lithology, geological structures and their impact on drainage patterns. The existing landforms of the basins are severely deteriorated by geocatastrophic processes like landslide, rock fall, soil creep and debris flow. Impact of morphological characters on the terrain is reflected by drainage basins of the area. The repetitive calculated values of all the morphometric parameters of different litho - tectonic zones were processed in the form of diagrams. The quantitative study of these morphometric parameters suggests that the basin shape, stream density, relief, ruggedness, stream frequency and circularity index are controlled by altitude and climate as well as nature of bed rocks. The morphometric parameters like absolute relief, relative relief, dissection index, drainage texture, drainage frequency and slope were analyzed and superimposed to workout homogeneity in landform units.