Water Science and Engineering 2017, 10(3) 175-183 DOI:   https://doi.org/10.1016/j.wse.2017.10.003  ISSN: 1674-2370 CN: 32-1785/TV

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Multi-scale nesting
Surge-fluvial flooding
Urban flooding
Multi-segmented boundary
Moving boundary

High-resolution flood modeling of urban areas using MSN_Flood

Michael Hartnett*, Stephen Nash

Department of Civil Engineering, National University of Ireland, Galway, Ireland


Although existing hydraulic models have been used to simulate and predict urban flooding, most of these models are inadequate due to the high spatial resolution required to simulate flows in urban floodplains. Nesting high-resolution subdomains within coarser-resolution models is an efficient solution for enabling simultaneous calculation of flooding due to tides, surges, and high river flows. MSN_Flood has been developed to incorporate moving boundaries around nested domains, permitting alternate flooding and drying along the boundary and in the interior of the domain. Ghost cells adjacent to open boundary cells convert open boundaries, in effect, into internal boundaries. The moving boundary may be multi-segmented and non-continuous, with recirculating flow across the boundary. When combined with a bespoke adaptive interpolation scheme, this approach facilitates a dynamic internal boundary. Based on an alternating-direction semi-implicit finite difference scheme, MSN_Flood was used to hindcast a major flood event in Cork City resulting from the combined pressures of fluvial, tidal, and storm surge processes. The results show that the model is computationally efficient, as the 2-m high-resolution nest is used only in the urban flooded region. Elsewhere, lower-resolution nests are used. The results also show that the model is highly accurate when compared with measured data. The model is capable of incorporating nested sub-domains when the nested boundary is multi-segmented and highly complex with lateral gradients of elevation and velocities. This is a major benefit when modelling urban floodplains at very high resolution.

Keywords Multi-scale nesting   Surge-fluvial flooding   Urban flooding   Multi-segmented boundary   Moving boundary  
Received 2016-12-12 Revised 2017-06-23 Online: 2017-07-30 
DOI: https://doi.org/10.1016/j.wse.2017.10.003
Corresponding Authors: Michael.Hartnett@nuigalway.ie (Michael Hartnett).
Email: Michael.Hartnett@nuigalway.ie
About author:


Abt, S.R., Wittler, R.J., Taylor, A., Love, D.J., 1989. Human stability in a high flood hazard zone. Water Resources Bulletin 25(4), 881−890. http://dx.doi.org/10.1111/j.1752-1688.1989.tb05404.x.
Altenau, E.H., Pavelsky, T.M., Bates, P.D., Neal, J.C., 2017. The effects of spatial resolution and dimensionality on modeling regional-scale hydraulics in a multichannel river. Water Resources Research 53(2), 1683−1701. http://dx.doi.org/10.1002/2016WR019396.
Apel, H., Aronica, G.T., Kreibich, H., Thieken, A.H., 2009. Flood risk analyses: How detailed do we need to be? Natural Hazards 49(1), 79−98. http://dx.doi.org/10.1007/s11069-008-9277-8.
Bates, P.D., Horritt, M.S., Fewtrell, T.J., 2010. A simple inertial formulation of the shallow water equations for efficient two-dimensional flood inundation modelling. Journal of Hydrology 387(1−2), 33−45. http://dx.doi.org/10.1016/j.jhydrol.2010.03.027.
Blayo, E., Debreu, L., 2005. Revisiting open boundary conditions from the point of view of characteristic variables. Ocean Modelling 9(3), 231−252. http://dx.doi.org/10.1016/j.ocemod.2004.07.001.
DHI, 2007. Mike 21 Flow Model: Hydrodynamic Module User Guide. DHI Water and Environment.
Falconer, R.A., Chen, Y.P., 1991. An improved representation of flooding and drying and wind stress effects in a 2-D tidal numerical model. In: Proceedings of Institution of Civil Engineers, Part 2: Research and Theory 91, pp. 659−678. Institution of Civil Engineers, London.
Fewtreel, T.J., Duncan, A., Sampson, C.C., Neal, J.C., Bates, P.D., 2011. Benchmarking urban flood models of varying complexity and scale using high resolution terrestrial lidar data. Physics and Chemistry of the Earth 36(7−8), 281−291. http://dx.doi.org/10.1016/j.pce.2010.12.011.
Jonkman, S.N., Penning-Rowsell, E., 2008. Human instability in flood flows. Journal of the American Water Resource Association 44(5), 1208−1218. http://dx.doi.org/10.1111/j.1752-1688.2008.00217.x.
Keller, R.J., Mitsch, B., 1993. Safety Aspects of Design Roadways and Floodways. Urban Water Research Association of Australia, Melbourne.
Koch, S.E., McQueen, J.T., 1987. A survey of nested grid techniques and their potential for use within the mass weather prediction model. In: NASA Technical Memorandum 87808. National Aeronautics and Space Administration.
Korres, G., Lascaratos, A., 2003. A one-way nested eddy resolving model of the Aegean and Levantine Basins: Implementation and climatological runs. Annales Geophysicae 21, 205–220. http://dx.doi.org/10.5194/angeo-21-205-2003.
Liang, D., Lin, B., Falconer, R.A., 2007. Linking one- and two-dimensional models for free surface flows. Proceedings of the Institution of Civil Engineers Water Management 160(3), 145−151. http://dx.doi.org/10.1680/wama.2007.160.3.145.
Marchesiello, P., McWilliams, J., Shchepetkin, A., 2003. Open boundary conditions for long-term integration of regional oceanic models. Ocean Modelling 3(1−2), 1−20. http://dx.doi.org/10.1016/S1463-5003(00)00013-5.
Miyakoda, K., Rosati, A., 1977. One-way nested grid models: The interface conditions and the numerical accuracy. Monthly Weather Review 105(1977), 1092−1107.
Muis, S., Güneralp, B., Jongman, B., Aerts, J.C., Ward, P.J., 2015. Flood risk and adaptation strategies under climate change and urban expansion: A probabilistic analysis using global data. Science of the Total Environment, 538, 445−457. http//dx.doi.org/10.1016/j.scitotenv.2015.08.068
Nash, S., 2010. Development of an Adaptive Mesh Inter-Tidal Circulation Model. Ph. D. Dissertation. National University of Ireland Galway, Galway.
Nash, S., Hartnett, M., 2014. Development of a nested coastal circulation model: Boundary error reduction. Environmental Modelling & Software 53, 65−80. http://dx.doi.org/10.1016/j.envsoft.2013.11.007.
Nguyen, P., Thorstensen, A., Sorooshian, S., Hsu, K., AghaKouchak, A., Sanders, B., Koren, V., Cui, Z.T., Smith, M. 2016. A high resolution coupled hydrologic-hydraulic model (HiResFlood-UCI) for flash flood modeling. Journal of Hydrology 541, 401-420. http://dx.doi.org/10.1016/j.jhydrol.2015.10.047.
Nycander, J., Doos, K., 2003. Open boundary conditions for barotropic waves. Journal of Geophysical Research 108(C5), 3168–3187. http://dx.doi.org/10.1029/2002JC001529.
Olbert, A.I., Hartnett, M., 2010. Storms and surges in Irish coastal waters. Ocean Modelling 34(1−2), 50−62. http://dx.doi.org/10.1016/j.ocemod.2010.04.004.
Palma, E.D., Matano, R.P., 1998. On the implementation of passive open boundary conditions for a general circulation model: The barotropic mode. Journal of Geophysical Research 103(C1), 1319−1341. http://dx.doi.org/10.1029/97JC02721.
Pullen, J., Allen, J.S., 2001. Modeling studies of the coastal circulation off the northern coast of California: Statistics and patterns of wintertime flow. Journal of Geophysical Research 106(C11), 26959−26984. http://dx.doi.org/10.1029/2000JC000548.
Roed, L.P., Cooper, C., 1987. A study of various open boundary conditions for wind-forced barotropic numerical ocean models. Elsevier Oceanography Series, 45, 305−335. http://dx.doi.org/10.1016/S0422-9894(08)70454-9.
Xia, J., Falconer, R.A., Lin, B., Tan. G., 2011. Numerical assessment of flood hazard risk to people and vehicles in flash floods. Environmental Modelling and Software 26(8), 987−998. http://dx.doi.org/10.1016/j.envsoft.2011.02.017.
Zhang, D.L., Chang, H.R., Seaman, N.L., Wamer, T.T., Fritsch, J.M., 1986. A two-way interactive nesting procedure with variable terrain resolution. Monthly Weather Review 114, 1330−1339. http://dx.doi.org/10.1175/1520-0493(1986)114<1330:ATWINP>2.0.CO;2.

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