Volume 12, Issue 2 - June 2012
Download (8.736KB, PDF) |
- Abstract / Resumo
- References / Bibliografia
- Citations / Citações
Revista de Gestão Costeira Integrada
Volume 12, Número 2, Junho 2012, Páginas 117-129
DOI: 10.5894/rgci272
Submission:
March 11, 2011; Evaluation: May 24, 2011; Reception of revised
manuscript: August 12, 2011; Accepted: September 16, 2011; Available
on-line: 15 Dezembro 2011
Modeling Basin Infilling Processes in Estuaries using two different approaches: An Aggregate Diffusive Type Model and a Processed Based Model
Modelação do Preenchimento Sedimentar em Estuários. Comparação de duas abordagens: Modelo Difusivo de Parâmetros Agregados e Modelo de Processos Físicos
P. Laginha Silva@, 1, F. Martins1, T. Boski1, R. Sampath1
@ - Corresponding author: [email protected]
1 - Universidade do Algarve – CIMA, Campus da Penha 8005-139 Faro, Portugal.
E-mails: [email protected], [email protected], [email protected], [email protected]
ABSTRACT
Long term basin infilling simulations are traditionally carried out
using synthetic models. The usual reasons for the preference of these
types of models over the more elaborated process based models are the
heavy computational needs and the poor knowledge of the processes in
presence.
The main objective of this article is to show that computational power
and numerical methods are now reaching a state that these long term
simulations can be affordably obtained using state-of-the-art
process-based models. To accomplish this, the morphodynamic model, that
solves explicitly the mass conservation equation for the bathymetry
evolution and then actualizes the bathymetry, are used to perform long
term simulations for the estuarine bathymetry evolution.
The results are compared with a traditional synthetic aggregate
parameters basin infilling model of the diffusive type. It is shown
that the process based models, while conceptually different, produce
physically meaningful and comparable results with the diffusive type
models. Moreover, they enable the simulation of conditions not allowed
by the formulation of diffusive type models with acceptable
computational times, as for example the addition of tide and river
input.
Keywords: Morphodynamic modeling, Basin infilling, sediment dynamics, aggregate diffusive type model, Process Based Model.
RESUMO
As simulações de preenchimento sedimentar de longo termo são
tradicionalmente realizadas através de modelos de parâmetros agregados.
A justificação invocada para a utilização desses modelos em vez dos
modelos baseados em processos físicos, mais elaborados, relaciona-se
com as maiores necessidades computacionais destes últimos e com fraco
conhecimento dos processos presentes.
O principal objectivo deste artigo é mostrar que actualmente o poder
computacional e os métodos numéricos possibilitam que essas simulações
de longo-termo possam ser resolvidas utilizando modelos de processos
físicos. O modelo Mohid para além de ser morfodinâmico resolve ainda a
equação de conservação de massa para a evolução da batimetria que
depois actualiza a batimetria.
Os resultados são comparados com os obtidos por um modelo difusivo de
preenchimento sedimentar tradicional. Embora conceptualmente
diferentes, os modelos baseados em processos produzem resultados
fisicamente significativos e comparáveis com os modelos do tipo
difusivo. Os modelos baseados em processos permitem a simulação de
condições impossíveis de formular com os modelos do tipo difusivos em
escalas temporais computacionalmente aceitáveis.
Palavras-chave:Modelação
Morfodinâmica, Preenchimento Sedimentar, Dinâmica Sedimentar, Modelo
Difusivo de Parâmetros Agregados e Modelo de Processos Físicos
Ackers,
P.; White, W.R. (1973) – Sediment Transport: New Approach and Analysis.
Journal of the Hydraulics Division (ISSN: 0044-796X), 99(11):2041-2060.
ASCE - (American Society of Civil Engineers), Reston, Virginia, U.S.A.
Allen,
P.A.; Allen, J.R. (1990) – Basin Analysis: Principles and Applications.
445p., Blackwell Scientific Publications, Oxford, U.K. ISBN: 0632024232
Arakawa,
A.; Lamb, V.R. (1977) – Computational design of the basic dynamical
processes of the UCLA general circulation model. In: J. Chang (ed.),
Methods in Computational Physics, 17: 173-265, Academic Press, New
York, NY, U.S.A. ISBN: 0124608175.
Bernardes,
M.E.C.; Davidson, M.A.; Dyer, K.R.; George, K.J. (2006) – Towards
medium term (order of months) morphodynamic modelling of the Teign
estuary, UK. Ocean Dynamics, 56(3-4):186-197. DOI: 10.1007/s10236-005-0039-9.
Briggs, L.I.; Pollack, H.N. (1967) – Digital model of evaporate sedimentation. Science, 155(3761):453-456. DOI: 10.1126/science.155.3761.453.
Cao,
Z.; Carling, P.A. (2002) - Mathematical modeling of alluvial rivers:
reality and myth. Part 2: Special issues. Proceedings of the
Institution of Civil Engineers Water & Maritime Engineering,
154(4):297-307. DOI: 10.1680/wame.2002.154.4.297.
Carter,
T.R.; la Rovere, E.L. (2001) - Developing and Applying Scenarios. In:
McCarthy, J.J.; Canziani, O. F.; Leary, N.A.; Dokken, D.J.; White, K.S.
(eds.), Climate change 2001: impacts, adaptation and vulnerability,
pp.145-190, Third Assessment Report of the Intergovernmental Panel on
Climate Change (IPCC), Contribution of Working Group II, Cambridge
University Press, Cambridge, U.K. ISBN: 0521807689. Available: http://www.grida.no/climate/ipcc_tar/wg2/pdf/wg2TARchap3.pdf
Coelho,
H.; Neves, R.; White, M.; Leitão P.; Santos, A. (2002) - A Model for
Ocean Circulation on the Iberian Coast. Journal of Marine Systems,
32(1-3):153-179. DOI: 10.1016/S0924-7963(02)00032-5.
Flemmings,
P.B.; Jordan, T.E. (1989) – A synthetic stratigraphic model of foreland
basin development. Journal of Geophysical Research (ISSN 0148–0227),
94(B4):3851-3866, AGU - American Geophysical Union,. New York, NY,
U.S.A..
Gabriel, S.; Martins, F. (2008). –
First Results of a Long Term Morphodynamic Process Based Model. Journal
of Coastal Research (ISSN: 0749-0258), SI56(2):952-955. Available: http://e-geo.fcsh.unl.pt/
ICS2009/_docs/ICS2009_Volume_II/952.955_S.Gabriel_ICS2009.pdf
Goldenfeld, N.; Kadanoff, L.P. (1999) – Simple lessons from complexity. Science, 284(5411):87-89. DOI: 10.1126/science.284.5411.87.
Hibma,
A.; Schuttelaars, H.M.; Wang, Z.B. (2003) – Comparison of longitudinal
equilibrium profiles of estuaries in idealized and process-based
models. Ocean Dynamics, 53(3):252-269. DOI: 10-1007/s10236-003-0046-7.
Lyn,
D.A. (2007) – Turbulence Models for Sediment Transport Engineering. In:
Garcia, M. H. (ed.), Sedimentation Engineering: Processes, Management,
Modeling and Practice, pp.763-826, American Society of Civil Engineers,
Reston, VA, U.S.A. ISBN: 9780784408148.
Martins,
F.; Neves, R.; Leitão, P. (1998) – A three-dimensional hydrodynamic
model with generic vertical coordinate. In: V. Babovic & L. C.
Larsen (eds.), Hydroinformatics ‘98: proceedings of the third
International Conference on Hydroinformatics, Vol. 2, pp. 1403-1410,
Leiden, The Netherlands. ISBN: 9789054109853. Available: http://sapientia.ualg.pt/bitstream/10400.1/124/1/MARThr.pdf
Martins,
F.; Neves, R.; Leitão, P.; Silva, A. (2001) - 3D modeling in the Sado
estuary using a new generic coordinate approach. Oceanologica Acta,
24(Supplement 1):51-62. DOI: 10.1016/S0399-1784(01)00092-5.
Miranda,
R.; Braunschweig, F. ; Leitão, P. ; Neves, R. ; Martins, F. ; Santos A.
(2000) – MOHID 2000 - A coastal integrated object oriented model. In:
W.R. Blain & C.A. Brebbia (eds.), Ecology and the Environment
(Hydraulic Engineering Software VIII), 40:393-401.
DOI: 10.2495/HY000371.
Paola, C. (2000) – Quantitative models of sedimentary basin filing. Sedimentology, 47(Supplement):121-178. DOI: 10.1046/j.1365-3091.2000.00006.x
Paola,
C.; Heller, P.L.; Angevine, C.L. (1992) – The large-scale dynamics of
grain-size variation in alluvial basins, 1: Theory. Basin Research,
4(2):73-90, Laramie, Wy, U.S.A. DOI: 10.1111/j.1365-2117.1992.tb00145.x
Schuttelaars,
H.M.; de Swart, H.E. (2000) – Multiple morphodynamic equilibria in
tidal embayments. Journal of Geophysical Research,
105(C10):24105-24118. DOI: 10.1029/2000JC900110.
Schwarzacher, W. (1966) – Sedimentation in a subsiding basin. Nature, 210(5043):1349-1350. DOI: 10.1038/2101349a0.
Tipper,
J.C. (1992) – Landforms developing and basing filing: Three-dimensional
simulation of erosion, sediment transport, and deposition. In: R. Pflug
& J.W. Harbaugh (eds.), Computer Graphics in Geology. Lectures
Notes in Earth Sciences, Vol. 41, pp.155-170. Springer-Verlag, Berlin,
Germany. DOI: 10.1007/BFb0117794.
Wentworth,
C.K. (1922) – A scale of grade and class terms for clastic sediments.
The Journal of Geology, 30(5):377-392. Available http://www.jstor.org/stable/30063207.
Werner, B.T. (1999) – Complexity in natural landform patterns. Science, Vol. 284, 284(5411):102-104. DOI: 10.1126/science.284.5411.102.
em construção