A dip-corrected discharge estimation method for a river system. (October 2022)

• Record Type: Journal Article
• Authors: Handique, Anurag; Baruah, Anupal; Sarma, Arup Kumar; Bhattacharjya, Rajib Kumar
• Is Part Of: Flow measurement and instrumentation. Volume 87(2022)
• Publication Date: 2022-10
• Subjects: Dip phenomenon -- Bed rugosity -- Discharge estimation -- Entropy theory -- Brahmaputra river -- Braided section; Fluid dynamic measurements -- Periodicals; Flow meters -- Periodicals; Fluides, Dynamique des -- Mesure -- Périodiques; Débitmètres -- Périodiques; 681.2805
• DOI: 10.1016/j.flowmeasinst.2022.102222
• Languages: English
• ISSNs: 0955-5986

Abstract

Abstract: This work proposes a novel dip corrected velocity distribution model in combination with the entropy theory for discharge estimation in a braided river. A modified form of the dip correction factor is derived by considering the topographical complexities and applied for assessing velocity profiles in river cross-sections. The velocity profiles at different verticals are computed by employing Shanon's entropy theory. The depth-averaged velocities at different cross-sections are estimated from the computed vertical velocity profiles and substituted in the area-velocity method for the discharge calculation. The model is applied to two study areas, Majuli and Umananda of the Brahmaputra River, having both simple and braided sections. The validation of the model is performed using the observed discharge data available at the nearby gauge site for low flow condition. Results indicate that the integration of bed rugosity factor in dip corrected velocity distributions improves the accuracy of discharge estimations. Highlights: A dip corrected improved velocity distribution model is proposed for a braided stream. The discharge estimation in a river system is improved by including the bed rugosity factor in the entropy model. A comparison of the discharges estimated from the present model with other approaches is made. Statistical analysis indicates improved accuracy in the velocity and discharge computation from the proposed model.