Fractional Governing Equations of Diffusion Wave and Kinematic Wave Open-Channel Flow in Fractional Time-Space. I. Development of the Equations

Kavvas M. L., Ercan A.

JOURNAL OF HYDROLOGIC ENGINEERING, vol.20, no.9, 2015 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 20 Issue: 9
  • Publication Date: 2015
  • Doi Number: 10.1061/(asce)he.1943-5584.0001136
  • Journal Name: JOURNAL OF HYDROLOGIC ENGINEERING
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Keywords: Unsteady open channel flow, Fractional diffusion wave, Fractional kinematic wave, DISPERSION MODEL, HURST PHENOMENON, ADVECTION
  • Middle East Technical University Affiliated: No

Abstract

In this study the fractional governing equations for diffusion wave and kinematic wave approximations to unsteady open-channel flow in prismatic channels in fractional time-space were developed. The governing fractional equations were developed from the mass and motion conservation equations in order to provide a physical basis to these equations. A fractional form of the resistance formula for open-channel flow was also developed. Detailed dimensional analyses of the derived equations were then performed in order to ensure dimensional consistency of the derivations. It is shown that these fractional equations of unsteady open-channel flow are fundamentally nonlocal in terms of nonlocal fluxes. The derived fractional governing equations of diffusion wave and kinematic wave open-channel flow can accommodate both the long-memory nonlocal behavior of open-channel flow as well as its local, finite memory behavior, as is numerically demonstrated in the accompanying paper by the authors. (C) 2014 American Society of Civil Engineers.