Urban fluvial flood modelling using a two‐dimensional diffusion‐wave treatment, part 2: development of a sub‐grid‐scale treatment

Citations Over TimeTop 10% of 2005 papers

Abstract

Abstract This paper develops and tests a sub‐grid‐scale wetting and drying correction for use with two‐dimensional diffusion‐wave models of urban flood inundation. The method recognizes explicitly that representations of sub‐grid‐scale topography using roughness parameters will provide an inadequate representation of the effects of structural elements on the floodplain (e.g. buildings, walls), as such elements not only act as momentum sinks, but also have mass blockage effects. The latter may dominate, especially in structurally complex urban areas. The approach developed uses high‐resolution topographic data to develop explicit parameterization of sub‐grid‐scale topographic variability to represent both the volume of a grid cell that can be occupied by the flow and the effect of that variability upon the timing and direction of the lateral fluxes. This approach is found to give significantly better prediction of fluvial flood inundation in urban areas than traditional calibration of sub‐grid‐scale effects using Manning's n . In particular, it simultaneously reduces the need to use exceptionally high values of n to represent the effects of using a coarser mesh process representation and increases the sensitivity of model predictions to variation in n . Copyright © 2005 John Wiley & Sons, Ltd.

Related Papers

• → Linking Flow Regime, Floodplain Lake Connectivity and Fish Catch in a Large River-Floodplain System, the Volga–Akhtuba Floodplain (Russian Federation)(2011)41 cited
• → How Can We Identify Active, Former, and Potential Floodplains? Methods and Lessons Learned from the Danube River(2022)20 cited
• → Quantitative assessment of floodplain functionality using an index of integrity(2020)17 cited
• Methodology for determining floodway / flow conveyance extent in Australian floodplains(2018)
• Особенности пространственной организации и формирования локальных морфологических комплексов в пределах поймы реки Оки на ее рязанском участке(2014)