- Page 3: THESISFor obtaining the doctorate d
- Page 6: 3. utilisation de ce modèle pour
- Page 10 and 11: L’ensemble de ces indices permet
- Page 12 and 13: 2. Modélisation du système fluvia
- Page 14 and 15: 3. Caractéristiques principales de
- Page 17: ForewordsThis thesis pursues an env
- Page 22: framework for which it was develope
- Page 25 and 26: PART 1: PRESENTATION OF THE STUDY5
- Page 27 and 28: 1. The Nhue-To Lich river basins1.1
- Page 29 and 30: 3.77 m for low and high irrigation,
- Page 31 and 32: 1.2.2. RainfallFigure 1.1.4: Monthl
- Page 33 and 34: Over the whole year, the monthly av
- Page 35 and 36: Figure 1.1.15: Pie chart of land us
- Page 37 and 38: 2. Data base constructionIn order t
- Page 39 and 40: 2.2. Organization of the field surv
- Page 41 and 42: confluence point. The other points
- Page 43 and 44: In summary, the frequency of the ex
- Page 45 and 46: Point Time Level Discharge Cross-se
- Page 47 and 48: conducted independently from the sc
- Page 49 and 50: Figure 1.2.7: DO in on-boat surveyF
- Page 51 and 52: Figure 1.2.9 presents the photos of
- Page 53 and 54: degradable organic fraction in tota
- Page 55 and 56: natural products chemistry led by P
- Page 57 and 58: The analysis of chlorophyll-a is ca
- Page 59 and 60: small comparison between DOC, BOD m
- Page 61 and 62: 3. Hydrology of the Nhue-To Lich ri
- Page 63 and 64: Figure 1.3.3: Gate structure at the
- Page 65 and 66: The rating curve at Cau Den was als
- Page 67 and 68: counted here is constantly distribu
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4. Water quality of the Nhue-To-Lic
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Figure 1.4.5: DO extracted from mon
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the contrary, the low correlation o
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Figure 1.4.13: PCA of the upstream
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anthropogenic impact is short at th
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In conclusion, the seasonal variati
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NO3 in nitrification process requir
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PART 2: MODELLING OF THE NHUE-TOLIC
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IntroductionOne objective of this t
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definition of the system identifies
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Y = [(Σ((x c - x m ) 2 /x m,a )/n]
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3. The validation criteria are form
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1.2.2. Hydrodynamics and hydraulics
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AQUASIM's second task is to perform
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QUAL2 was specifically designed to
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UK; Wallingford Software 1994); 8 =
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system will be declared in the next
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The performance of parameter estima
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Based on these 3 factors, we have c
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The lengths of the first, the secon
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Figure 2.2.2: Rear Thuy Phuong dam
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2.3.3. Biochemical conceptual schem
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1973; Yen, 1979; French, 1985). The
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+ Heterotrophic growth on dissolved
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The loss of heterotrophic biomass i
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O 2 /l)P/l)S NH4 : concentration of
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In contrast, the Nhue river is ofte
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2.4.2.1.4. Estimation of the kineti
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In fresh water environment, the equ
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+ NH 4 exchangeIn this equation, th
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τ cd : critical shear stress for d
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The critical shear stress for erosi
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2.4.2.2.6. Precipitation/dissolutio
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The table 2.2.9 represents complete
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3.2. Initial and boundary condition
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N1TLSpecies Prior simulation After
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3.3. Simulation prior to calibratio
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adsorption in our river. The decrea
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and an intermediate class 2 with
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3. The half-saturation coefficients
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negligible factor in the polluted a
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3.5. Results of the post-calibratio
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conceptual scheme and in providing
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case of inundation. We suppose that
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the inconsistence data employed in
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4. Simulation of the transient stat
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water discharge can dilute the diss
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this modelling period with previous
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4.4.1.3. Estimation of accumulative
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4.4.2.2. Boundary conditions for un
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Figure 2.4.19: Initial condition of
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The diurnal variation is another tr
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Figure 2.4.29: Simulated and measur
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August 1 st to 4 th 2003. Of which
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The wind speed was predicted from t
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occurrence is regular whenever rain
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Figure 2.4.47: Boundary condition o
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Figure 2.4.55: Simulated and measur
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Figure 2.4.59: Turbidity at NT1 in
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PART 3: DISCUSSION167
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IntroductionIn the previous parts,
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Figure 3.1.1: Average chlorophyll-a
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In conclusion, with high nutrient l
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Dissolved oxygen (g O 2 /m 2 /d) NH
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- DO balanceFigure 3.1.9: Dissolved
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- NH 4 balanceFigure 3.1.11: NH 4 b
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Figure 3.1.14: NH 4 balance in summ
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Figure 3.1.15: Exponential relation
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2. Investigations toward restoratio
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Figure 3.2.3: Simulation based on d
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The distance of recovery is hardly
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upstream inflow. It also implies th
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So far, the wastewater of the Hanoi
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The simulation results of two varia
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Figure 3.2.17: DO at NT2 in differe
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Figure 3.2.21: Evolution of DO at d
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As shown in simulation results, the
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Conclusion and perspectivesConclusi
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processes which were not measured.
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1. Annex 1: Experimental protocols
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PO 4P totalRange Method Standardsol
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- Analytical methods+ BOD: Water sa
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MgClSO 4HCO 3TraceelementsRange Met
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2. Annex 2: Estimation of organic m
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Ratios between heterotrophic bacter
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- To assess the individual local pa
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δmabsj=1n∑n i=1sijParameter rank
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The above definition has a simple i
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4. Annex 4: Mathematical formulas i
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⎛∧ ⎜j = ⎜QC⎜⎝iQ ⎞∂C
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6. Annex 6: Stoichiometric coeffici
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Subs. ValueUnitaerobic sediment exc
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kwind⎛= ⎜⎝ 3.6e1−1 225 10
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DO evolution in Bell Jar experiment
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Firstly of all, NH 4 and DO behave
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Results of Bell Jar experiment at T
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As clearly observed in the figure a
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10. Annex 10: Parameter estimation
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and parameter estimation. It is exp
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First of all, an experimental layou
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ate of phytoplankton also ranks low
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ReferencesAalderink R.H., Klaver N.
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Brown L.C. and Barnwell T.O. (1987)
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Henze M., Grady C.P.L., Gujer W., M
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Liss, P.S. and Slater, P.G. (1974)
- Page 281 and 282:
Prieur N. (2001) Dynamique des cont
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Smith, V. H., Tilman G. D., and Nek
- Page 285:
Zonneveld C. (1998) A cell-based mo