Calibration of a 1D/1D urban flood model using 1D/2D model results in the absence of field data
Само за регистроване кориснике
2011
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Recently increased flood events have been prompting researchers to improve existing coupled flood-models such as one-dimensional (1D)/1D and 1D/two-dimensional (2D) models. While 1D/1D models simulate sewer and surface networks using a one-dimensional approach, 1D/2D models represent the surface network by a two-dimensional surface grid. However their application raises two issues to urban flood modellers: (1) stormwater systems planning/emergency or risk analysis demands for fast models, and the 1D/2D computational time is prohibitive, (2) and the recognized lack of field data (e. g. Hunter et al. (2008)) causes difficulties for the calibration/validation of 1D/1D models. In this paper we propose to overcome these issues by calibrating a 1D/1D model with the results of a 1D/2D model. The flood-inundation results show that: (1) 1D/2D results can be used to calibrate faster 1D/1D models, (2) the 1D/1D model is able to map the 1D/2D flood maximum extent well, and the flooding limits sati...sfactorily in each time-step, (3) the 1D/1D model major differences are the instantaneous flow propagation and overestimation of the flood-depths within surface-ponds, (4) the agreement in the volume surcharged by both models is a necessary condition for the 1D surface-network validation and (5) the agreement of the manholes discharge shapes measures the fitness of the calibrated 1D surface-network.
Кључне речи:
calibration / coupled models / flood extents / urban floodingИзвор:
Water Science and Technology, 2011, 64, 5, 1016-1024Финансирање / пројекти:
- Urban Flood Management Research Priority Area of the Flood Risk Management Research Consortium (FRMR
- UK Engineering and Physical Sciences Research Council (EPSRC) / Engineering and Physical Sciences Research Council GR/S76304/01
- NERC
- DEFRA
- EA
- Scottish Executive
- Rivers Agency (Northern Ireland)
- UKWIR
- Portuguese Foundation for Science and Technology (FCT) PTDC/AAC-AMB/101197/2008
DOI: 10.2166/wst.2011.467
ISSN: 0273-1223
PubMed: 22214046