Abstract
All rivers undergo changes in channel geometry downstream
systematically. A river adjusts its channel geometry
(width,depth,cross-sectional area)within the limitations imposed by
discharge, channel lithology. As not much studies on channel geometry on
large monsoon-fed rivers. Therefore, in this study an attempt will be
made to understand the fluvial geomorphological characteristics and
variation for 2 decades of major Indian Peninsular River namely Krishna,
in terms of channel geometry, discharge. Present study focusses on
channel geometry changes downstream for a large Peninsular River . The
Krishna River is the third largest river in India.Cross-sectional data
for a downstream gauging sites during 1990-2010is downloaded from India
Water Resources Information System (India-WRIS) WebGIS. portal. Channel
Geometry parameters in terms of Channel Cross-Section
Area,Width,Depth,Wetted Perimeter,Hydraulic Radius,Form Ratio are
derived from the data involving 9 sites on main river. The Graphs
indicate as the maximum discharge increases with corresponding increase
in Cross-Sectional Area,Width,Depth,Wetted Perimeter,Form
Ratio,Velocity,Hydraiulic Radius is observed with corresponding decrease
in Mean Velocity downstream.Channel forms upstream to downstream becomes
less steep.APower-log regression equation carried out to evaluate the
level of confidence between the parameters.