“Slopes of the Yamuna & Chambal Ravines of Agra District: A Morphogenetic Analysis”

By : Chandra Bhan , Pankaj Kumar

Page No: 350-370

Abstract
Generally, in the evolution of landforms and their slopes, several agents of denudation are involved. But in the development of ravines slopes, the contribution of gully streams alone is far greater than any other agent. Innumerable new slopes are produced by the eroding action of fresh gullies in each rainy season. With time, they increase their lengths and enlarge their drainage areas. Factors of topography, lithology, climate and vegetative cover play insignificant role in the process of slope formation in the study area. All common types of natural slopes are found in the Yamuna & the Chambal ravines of the Agra district. Vertical slopes are most dominant in upper parts of gully basins and at cliffs on river banks, where gully streams end their journey. In the middle portions of basins of large streams, slopes are rectilinear in plan and very steep in gradient. Convexity is poorly developed and generally seen in the upper segments of valley slopes in middle portions of drainage areas. Concavity characterizes high gully banks particularly at the sites of the rotational slumping. For several decades, no appreciable change has been noticed in the morphology of slopes of river cliffs and scarps at gully heads. This fact suggests that dynamic equilibrium exists in the individual slopes or on some of their parts.

Authors :
Chandra Bhan : Former Head, Department of Geography, R.B.S. College, Agra.
Pankaj Kumar : Sr. Geographer, Map Division, O/o the Registrar General, India.
 

DOI: https://doi.org/10.32381/ATNAGI.2020.40.02.10