<abstract xmlns="http://www.w3.org/1999/xhtml"><p> Existence of piedmont zone in a river bed is a critical parameter from among numerous variations of topographical, geological and geographical conditions that can significantly influence the river flow scenario. Downstream flow situation assessed by routing of upstream hydrograph may yield higher flow depth if existence of such high infiltration zone is ignored and therefore it is a matter of concern for water resources planning and flood management. This work proposes a novel modified hydrodynamic model that has the potential to accurately determine the flow scenario in presence of piedmont zone. The model has been developed using unsteady free surface flow equations, coupled with Green-Ampt infiltration equation as governing equation. For solution of the governing equations Beam and Warming implicit finite difference scheme has been used. The proposed model was first validated from the field data of Trout Creek River showing excellent agreement. The validated model was then applied to a hypothetical river reach commensurate with the size of major tributaries of Brahmaputra Basin of India. Results indicated a 10% and 14% difference in the maximum value of discharge and depth hydrograph in presence and absence of piedmont zone respectively. Overall this model was successfully used to accurately predict the effect of piedmont zone on the unsteady flow in a river.</p></abstract>

Existence of piedmont zone in a river bed is a critical parameter from among numerous variations of topographical, geological and geographical conditions that can significantly influence the river flow scenario. Downstream flow situation assessed by routing of upstream hydrograph may yield higher flow depth if existence of such high infiltration zone is ignored and therefore it is a matter of concern for water resources planning and flood management. This work proposes a novel modified hydrodynamic model that has the potential to accurately determine the flow scenario in presence of piedmont zone. The model has been developed using unsteady free surface flow equations, coupled with Green-Ampt infiltration equation as governing equation. For solution of the governing equations Beam and Warming implicit finite difference scheme has been used. The proposed model was first validated from the field data of Trout Creek River showing excellent agreement. The validated model was then applied to a hypothetical river reach commensurate with the size of major tributaries of Brahmaputra Basin of India. Results indicated a 10% and 14% difference in the maximum value of discharge and depth hydrograph in presence and absence of piedmont zone respectively. Overall this model was successfully used to accurately predict the effect of piedmont zone on the unsteady flow in a river.

A modified hydrodynamic model for routing unsteady flow in a river having piedmont zone

Dept. of Civil Engineering, Indian Institute of Technology, Guwahati,

Journal of Hydrology and Hydromechanics

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Existence of piedmont zone in a river bed is a critical parameter from among numerous variations of topographical, geological and geographical conditions that...

A modified hydrodynamic model for routing unsteady flow in a river having piedmont zone

Published Online: Dec 08, 2016

Page range: 60 - 67

Received: Oct 19, 2015

Accepted: Jul 26, 2016

DOI: https://doi.org/10.1515/johh-2016-0052

Keywords
Groundwater flow, Numerical modeling, Piedmont zone, Green-Ampt. Equation, Surface water equation

© 2016

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

A modified hydrodynamic model for routing unsteady flow in a river having piedmont zone

Published Online: Dec 08, 2016

Page range: 60 - 67

Received: Oct 19, 2015

Accepted: Jul 26, 2016

DOI: https://doi.org/10.1515/johh-2016-0052

KeywordsGroundwater flow, Numerical modeling, Piedmont zone, Green-Ampt. Equation, Surface water equation

© 2016

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Keywords
Groundwater flow, Numerical modeling, Piedmont zone, Green-Ampt. Equation, Surface water equation