Paper Title
ASSESSMENT OF RIVER CROSS-SECTION USING LINEAR, SLOPE BREAK METHOD AND SATELLITE DATA

Abstract
Abstract - River geometry is an important input data for understanding dynamics of a river system. The increased stress (flooding and siltation) on rivers had encouraged the use of hydraulic modelling in poorly gauged regions. Moreover, these approaches suffer from lack of knowledge about river bathymetry, which cannot be deduced on a regular basis due to practical constraints. This study looks into the feasibility of estimating minimum channel bed elevation (Z_min) using two methods (called "Linear method" and "Slope-Break method"). To assess their performance, simulated cross-sectional flow widths (w) were derived from 23 previously surveyed cross-sections, and channel bathymetry exposure varying from 10% to 90% of bankfull conditions was calculated using 17 years of daily discharge records. The results demonstrate that the Slope-Break approach outperforms the Linear method in estimating minimum channel bed elevation(Z_min) by identifying sites with two distinct hydraulic correlations (one for low flows and one for moderate to high flows). Keywords - Channel Bed Elevation, Channel Exposure, River Ganga, Hydraulic Relationships.