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Implementation of a two-way coupled atmospheric-hydrological system for environmental modeling at regional scale

Pereira, Fabio LU ; de Moraes, Marcio A. E. and Bertacchi Uvo, Cintia LU (2014) In Hydrology Research 45(3). p.504-514
Abstract
This work describes the two-way coupling performed between the regional atmospheric model Brazilian Regional Atmospheric Modeling System (BRAMS) and the hydrological model MGB-IPH. As a first step of the atmosphere-hydrology coupling, only the water balance variables were coupled. Differences in temporal and spatial scales between MGH-IPH and BRAMS were analyzed. By default, MGB-IPH has a daily time step whereas BRAMS uses smaller time steps. Thus, accumulated rainfall values from BRAMS were used to feed MGB-IPH. On the other hand, daily values of evapotranspiration from MGB-IPH were provided to BRAMS. This procedure was assumed as a daily loop in the simulations. Differences in spatial scales were avoided by using the same grid size (10 x... (More)
This work describes the two-way coupling performed between the regional atmospheric model Brazilian Regional Atmospheric Modeling System (BRAMS) and the hydrological model MGB-IPH. As a first step of the atmosphere-hydrology coupling, only the water balance variables were coupled. Differences in temporal and spatial scales between MGH-IPH and BRAMS were analyzed. By default, MGB-IPH has a daily time step whereas BRAMS uses smaller time steps. Thus, accumulated rainfall values from BRAMS were used to feed MGB-IPH. On the other hand, daily values of evapotranspiration from MGB-IPH were provided to BRAMS. This procedure was assumed as a daily loop in the simulations. Differences in spatial scales were avoided by using the same grid size (10 x 10 km) in both models, in such a way that neither upscaling nor downscaling was necessary. The coupled system was tested for the Rio Grande basin situated in south-eastern Brazil by comparing results from BRAMS with results from the coupled system for the same period, with the same input data. Outputs from the runs were compared to water vapor satellite images. The results from the coupled model tests indicated that its predictions of rainfall distribution were more accurate than BRAMS. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
atmospheric model, distributed hydrological model, two-way coupling
in
Hydrology Research
volume
45
issue
3
pages
504 - 514
publisher
IWA Publishing
external identifiers
  • wos:000338913600016
  • scopus:84906216514
ISSN
1998-9563
DOI
10.2166/nh.2013.335
project
MERGE
language
English
LU publication?
yes
id
333695ee-5c3c-47a2-9268-a8f6cea49863 (old id 4598840)
date added to LUP
2014-09-05 11:23:42
date last changed
2017-01-01 05:41:01
@article{333695ee-5c3c-47a2-9268-a8f6cea49863,
  abstract     = {This work describes the two-way coupling performed between the regional atmospheric model Brazilian Regional Atmospheric Modeling System (BRAMS) and the hydrological model MGB-IPH. As a first step of the atmosphere-hydrology coupling, only the water balance variables were coupled. Differences in temporal and spatial scales between MGH-IPH and BRAMS were analyzed. By default, MGB-IPH has a daily time step whereas BRAMS uses smaller time steps. Thus, accumulated rainfall values from BRAMS were used to feed MGB-IPH. On the other hand, daily values of evapotranspiration from MGB-IPH were provided to BRAMS. This procedure was assumed as a daily loop in the simulations. Differences in spatial scales were avoided by using the same grid size (10 x 10 km) in both models, in such a way that neither upscaling nor downscaling was necessary. The coupled system was tested for the Rio Grande basin situated in south-eastern Brazil by comparing results from BRAMS with results from the coupled system for the same period, with the same input data. Outputs from the runs were compared to water vapor satellite images. The results from the coupled model tests indicated that its predictions of rainfall distribution were more accurate than BRAMS.},
  author       = {Pereira, Fabio and de Moraes, Marcio A. E. and Bertacchi Uvo, Cintia},
  issn         = {1998-9563},
  keyword      = {atmospheric model,distributed hydrological model,two-way coupling},
  language     = {eng},
  number       = {3},
  pages        = {504--514},
  publisher    = {IWA Publishing},
  series       = {Hydrology Research},
  title        = {Implementation of a two-way coupled atmospheric-hydrological system for environmental modeling at regional scale},
  url          = {http://dx.doi.org/10.2166/nh.2013.335},
  volume       = {45},
  year         = {2014},
}