Preprints
https://doi.org/10.5194/nhess-2021-259
https://doi.org/10.5194/nhess-2021-259

  03 Sep 2021

03 Sep 2021

Review status: this preprint is currently under review for the journal NHESS.

Compound flood modelling framework for rainfall-groundwater interactions

Francisco Peña1,2,3,4,5, Fernando Nardi1,3, Assefa Melesse4, Jayantha Obeysekera5, Fabio Castelli2, René M. Price3,4, Todd Crowl3, and Noemi Gonzalez-Ramirez6 Francisco Peña et al.
  • 1WARREDOC, University for Foreigners of Perugia, Perugia, 06123, Italy
  • 2Department of Civil and Environmental Engineering (DICEA), University of Florence, Florence, 50139, Italy
  • 3Institute of Environment (InWE), Florida International University, Miami, FL, 33199, USA
  • 4Department of Earth and Environment, Florida International University, Miami, FL, 33199, USA
  • 5Sea Level Solutions Center, Florida International University, Miami, FL, 33181, USA
  • 6Riada Engineering, Inc. P.O. Box 104, Nutrioso, AZ 85932, USA

Abstract. Compound floods are an active area of research where the complex interaction between pluvial, fluvial, coastal or groundwater flooding are analyzed. A number of studies have simulated the compound flooding impacts of precipitation, river discharge and storm surge variables with different numerical models and linking techniques. However, groundwater flooding is often neglected in flood risk assessments due to its sporadic frequency - as most regions have water tables sufficiently low that do not exacerbate flooding conditions -, isolated impacts and considerably less severity in respect to other types of flooding. This paper presents a physically-based, loosely-coupled modelling framework using FLO-2D and MODFLOW-2005 that is capable to simulate surface-subsurface water interactions to represent compound flooding events in North Miami. FLO-2D, responsible of the surface hydrology and infiltration processes, transfers the infiltration volume as recharge to MODFLOW-2005 until the soil absorption capacity is exceeded, while MODFLOW-2005 return exchange flow to the surface when groundwater heads are higher than the surface depth. The model calibration is based on three short-lived storm events that as individual processes represent minimum flooding conditions but in combination with pre-existing high-water table levels results in widespread flooding across the study area. Understanding groundwater flood risk is of particular interest to low-elevation coastal karst environments as the sudden emergence of the water table at ground surface can result in social disruption, adverse effects to essential services and damage infrastructure. Results are validated using FEMA’s severe repetitive loss (SRL) property records and crowdsourced data. Further research should assess the exacerbated impacts of high tides and sea level rise on water tables under current and future climate projections.

Francisco Peña et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on nhess-2021-259', Anonymous Referee #1, 20 Sep 2021
  • RC2: 'Comment on nhess-2021-259', Anonymous Referee #2, 21 Sep 2021

Francisco Peña et al.

Francisco Peña et al.

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Short summary
Groundwater flooding, a rare phenomenon that is gradually increasing in low-elevation coastal cities due to higher water tables, is often neglected in flood risk mapping due to its sporadic frequency and considerably less severity in respect to other types of flooding. A loosely coupled flood model is used to simulate the interplay between surface and subsurface flooding mechanisms simultaneously. This work opens new horizons on the development of CF models from a holistic perspective.
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