The Choice of Stage-Discharge Relationship for the Ganges and Brahmaputra Rivers in Bangladesh | Zendy

M. Monirul Qader Mirza | Zendy

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The Choice of Stage-Discharge Relationship for the Ganges and Brahmaputra Rivers in Bangladesh

Author(s) -

M. Monirul Qader Mirza

Publication year - 2003

Publication title -

hydrology research

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.665

H-Index - 48

eISSN - 1996-9694

pISSN - 0029-1277

DOI - 10.2166/nh.2003.0010

Subject(s) - rating curve , logarithm , hydrology (agriculture) , estimator , stage (stratigraphy) , flood warning , environmental science , mathematics , flood myth , flood control , goodness of fit , polynomial , statistics , geology , geography , geomorphology , geotechnical engineering , mathematical analysis , sediment , paleontology , archaeology

The Ganges and Brahmaputra are the two largest rivers in Bangladesh. Discharge estimations of these rivers from a stage-discharge relationship or rating curve are crucial for flood warning/control/mitigation and water resources development. So far, logarithmic rating curves have been widely used in Bangladesh. The suitability of semi-logarithmic, polynomial and quadratic rating curves has not been investigated. In this study, all four recognised stage-discharge relationships were examined for the Ganges and Brahmaputra rivers. Unbiased least squares estimators were determined for the segmented logarithmic and semi-logarithmic rating curves. This enhanced their efficiency in inter-and extrapolating discharges from the given river stages. Based on detailed analysis and goodness-of-fit criteria, segmented logarithmic and third order polynomial rating curves were found to be the best for the Ganges and Brahmaputra rivers, respectively.

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