Title: Modelling of stage-discharge relationship using optimisation techniques for Jhelum River in Kashmir Valley, NW Himalayas
Authors: Sheikh Umar; Mohammad Akbar Lone; Narendra Kumar Goel; Mohammad Zakwan
Addresses: Department of Civil Engineering, National Institute of Technology, Srinagar, J&K, India ' Department of Civil Engineering, National Institute of Technology, Srinagar, J&K, India ' Department of Hydrology, Indian Institute of Technology Roorkee, Roorkee-247667, India ' Department of Civil Engineering, Maulana Azad National Urdu University, Hyderabad, Telangana, India
Abstract: The modelling of a reliable stage-discharge rating curve is crucial for the estimation of accurate discharge at particular gauging stations which is essential for planning and managing water resources efficiently as well as floods. This study involves the development of rating curves by applying generalised reduced gradient (GRG) optimisation technique and conventional regression method (RM) and to evaluate the performance of two methods indices like mean absolute relative error (MARE), correlation coefficient (r), Willmott Index (WI) and Nash-Sutcliffe efficiency (NSE) were used along with the graphical interpretation. The outcomes of the analysis revealed that the GRG optimisation technique is most suitable for eight gauging stations on the Jhelum River. Moreover, in the graphical representation, there is close agreement between the observed and predicted discharge by the GRG technique. Furthermore, the study revealed that the GRG technique showed a highly positive correlation (r > 0.95) at all the eight sites between the observed and predicted discharge. Therefore, the GRG solver technique is most suitable for the estimation of discharge for the given stage, which can be recorded easily than streamflow even during floods.
Keywords: rating curve; optimisation-technique; generalised reduced gradient; GRG; stage; discharge.
International Journal of Hydrology Science and Technology, 2023 Vol.15 No.2, pp.140 - 153
Received: 15 Feb 2021
Accepted: 06 Jul 2021
Published online: 02 Feb 2023 *