Modeling Estuarine Morphodynamics under Combined River and Tidal Forcing

237 Pages·2014·28.593 MB·English

by  Guo, L

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Modeling estuarine
morphodynamics
under combined river
and tidal forcing
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This research is dedicated to studying long- Analysis of morphodynamic modeling results lin Leicheng GUO
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term estuarine morphodynamic behavior under exposes significant mechanisms inducing tidal e
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combined river and tidal forcing. Analysis residual sediment transport and controlling tu
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of river tides in the Yangtze River estuary long-term morphodynamic development. rin
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(YRE) in China, schematized morphodynamic Morphodynamic equilibria in 1D and 2D m
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modeling in 1D and 2D mode and simulations can be defined by vanishing rph
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morphodynamic modeling of the YRE based gradients of tidal residual sediment transports dy
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on a process-based numerical model (Delft3D) and meeting empirical morphodynamic am
are conducted. Morphodynamic sensitivities to relationships. ics
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river discharge magnitude and time variations, n
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tidal strength and tidal constituents are then This research indicates the value of r c
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systematically explored. numerical modeling in examining long-term m
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morphodynamic development in millennia in
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Analysis of river tides in the YRE reveals time scale. Understanding of the controls on riv
strong river-tide interactions and non-linear morphodynamic behavior in estuaries under e
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modulation of tides by river discharge. River river and tidal forcing is to the benefit of n
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discharge alters tidal asymmetries and managing estuaries’ functions in a long-term tid
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resultant tidal residual sediment transport. point of view. l fo
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PROPOSITIONS
pertaining to the thesis
Modeling estuarine morphodynamics under combined river and tidal forcing
by
Leicheng Guo
Delft, 8 December 2014

1. Non-stationary river flow modulates tidal dynamics non-linearly through friction.
(this thesis)
2. River-tide current interactions are of profound morphodynamic importance by
enhancing seaward sediment export. (this thesis)
3. A medium river discharge leads to deepest equilibrium estuarine depth. (this thesis)
4. Combination of different tidal constituents has a diversified impact on residual
sediment transport and associated tidal basin morphodynamics over large space and
long time scales. (this thesis)
5. Schematized models unveil the governing mechanisms of morphodynamic processes
in a more transparent way than more complex models. Thus schematized models are
more useful.
6. Nature is awesome in complexity and at the same time beautiful in simplicity. The
ultimate objective of science is to formulate simple and applicable laws from the
complex reality.
7. To pursue a doctoral degree in the Netherlands is like biking in a rainy, windy and
dark winter night. You need a light to show the way ahead.
8. Negative research results showing that certain methodologies do not work contribute
to science in the same way as positive results. Negative results deserve publication
and citation.
9. The long-term value of government mass sponsoring of doctoral candidates studying
abroad needs to be reflected by a reducing need to do that in the next generation.
10. Follow your heart in the Netherlands and follow your duty in China.

These propositions are regarded as opposable and defendable, and have been
approved as such by the supervisors Prof. dr. ir Dano (J.A.) Roelvink and Prof. dr.
Qing He.
STELLINGEN
behorende bij het proefschrift
Modeling estuarine morphodynamics under combined river and tidal forcing
Van
Leicheng Guo
Delft, 8 Dec 2014

1. Niet-stationaire rivier afvoer verandert getij dynamica op een niet-lineaire wijze door
toedoen van wrijving. (deze thesis)
2. Interacties tussen getij en rivier afvoer hebben een belangrijke invloed op de
morfodynamica doordat ze het zeewaarts transport vergroten. (deze thesis)
3. Een medium rivier afvoer leidt tot de grootste estuarine evenwichtsdiepte. (deze
thesis)
4. Combinatie van verschillende getij-constituenten heeft een brede invloed op
residuele sediment transporten en gerelateerde getij bekken morfodynamica over een
groot gebied en over een lange periode. (deze thesis)
5. Geschematiseerde modellen onthullen belangrijke morfodynamische processen op
een meer transparante manier dan complexe modellen. Daarom zijn
geschematiseerde modellen nuttiger.
6. De natuur heeft een overweldigende complexiteit, maar laat tegelijkertijd ook
schoonheid in eenvoud zien. Het uiteindelijke doel van wetenschap is om
eenvoudige en toepasbare wetten te formuleren uit de complexe realiteit.
7. Het volgen van een promotie traject in Nederland is als fietsen in een regenachtige,
winderige, donkere winter nacht. Je hebt licht nodig om de weg voorwaarts te zien.
8. Negatieve onderzoeksresultaten die laten zien dat bepaalde methodes niet werken
dragen net als positieve resulaten bij aan de wetenschap. Negatieve resultaten
verdienen daarom publicatie en citatie.
9. De lange termijn waarde van door de overheid gefinancierde buitenlandse doctoraal
studies moet worden gereflecteerd in een afname van het nut van die financiering in
volgende generaties.
10. Volg je hart in Nederland en doe je plicht in China.

Deze stellingen worden opponeerbaar en verdedigbaar geacht en zijn als zodanig
goedgekeurd door de promotoren Prof. dr. Ir. J.A. Roelvink en Prof. dr. Q. He.
MODELING ESTUARINE MORPHODYNAMICS
UNDER COMBINED RIVER AND TIDAL FORCING

径潮流作用下的河口长周期动力地貌模拟研究

Modeling estuarine morphodynamics
under combined river and tidal forcing

DISSERTATION

Submitted in fulfillment of the requirements of
the Board for Doctorate of Delft University of Technology
and of
the Academic Board of the UNESCO-IHE Institute for Water Education
for the Degree of DOCTOR
to be defended in public
on Monday, 8 December 2014 at 15:00 hours
in Delft, the Netherlands

by

Leicheng GUO
born in Ganzhou, Jiangxi, China

Bachelor of Engineering, Wuhan University, Wuhan, China
This dissertation has been approved by the promotors:
Prof. dr. ir. J.A. Roelvink
Prof. dr. Q. He

Composition of the Doctoral Committee:
Chairman Rector Magnificus, TU Delft
Vice-Chairman Rector of UNESCO-IHE
Prof. dr. ir. J.A. Roelvink UNESCO-IHE/ TU Delft, promotor
Prof. dr. Q. He East China Normal University, China, promotor
Dr. ir. M. van der Wegen UNESCO-IHE
Prof. dr. ir. Z.B. Wang Delft University of Technology
Prof. dr. D.A. Jay Portland State University, USA
Prof. dr. ir. A.E. Mynett UNESCO-IHE/ Delft University of Technology
Prof. dr. ir. M.J.F. Stive Delft University of Technology, reserve member

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© 2014, Leicheng Guo

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Cover image: modeled fluvio-deltaic morphodynamics after 3000 years

ISBN 978-1-138-02750-3 (Taylor & Francis Group)
This work is financially supported by the China Scholarship Council
(No.2009101208), the National Natural Science Foundation of China
(No.41276080), and the ReSeDUE project (No.60038881).

It is always advisable to have in mind a basically correct
mental picture of a physical phenomenon in order to guide one’s
intuition.
By P.H. LeBlond, 1978
In On tidal propagation in shallow rivers,
Journal of Geophysical Research, 83, C9, 4717-4721.