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An efficient and stable hydrodynamic model with novel source term discretization schemes for overland flow and flood simulations

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posted on 31.07.2018, 08:32 authored by Xilin Xia, Qiuhua LiangQiuhua Liang, Xiaodong Ming, Jingming Hou
Numerical models solving the full 2-D shallow water equations (SWEs) have been increasingly used to simulate overland flows and better understand the transient flow dynamics of flash floods in a catchment. However, there still exist key challenges that have not yet been resolved for the development of fully dynamic overland flow models, related to (1) the difficulty of maintaining numerical stability and accuracy in the limit of disappearing water depth and (2) inaccurate estimation of velocities and discharges on slopes as a result of strong nonlinearity of friction terms. This paper aims to tackle these key research challenges and present a new numerical scheme for accurately and efficiently modeling large-scale transient overland flows over complex terrains. The proposed scheme features a novel surface reconstruction method (SRM) to correctly compute slope source terms and maintain numerical stability at small water depth, and a new implicit discretization method to handle the highly nonlinear friction terms. The resulting shallow water overland flow model is first validated against analytical and experimental test cases and then applied to simulate a hypothetic rainfall event in the 42 km2Haltwhistle Burn, UK.

Funding

This work is funded by the NERC SINATRA and TENDERLY projects (grant NE/K008781/1) and REMATCH project (grant NE/P015476/1).

History

School

  • Architecture, Building and Civil Engineering

Published in

Water Resources Research

Volume

53

Issue

5

Pages

3730 - 3759

Citation

XIA, X. ... et al, 2017. An efficient and stable hydrodynamic model with novel source term discretization schemes for overland flow and flood simulations. Water Resources Research, 53 (5), pp.3730-3759.

Publisher

American Geophysical Union (AGU) © The Authors

Version

VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution 4.0 International (CC BY 4.0) licence. Full details of this licence are available at: http://creativecommons.org/licenses/by/4.0/

Acceptance date

06/04/2017

Publication date

2017-05-05

Notes

This is an Open Access Article. It is published by the American Geophysical Union under the Creative Commons Attribution 4.0 International Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/4.0/

ISSN

0043-1397

eISSN

1944-7973

Language

en