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Table of contents
RESUME ETENDU EN FRANÇAIS
0.1 État de l’art
0.2 Objectifs de l’étude
0.3 Étude expérimentale de la chasse hydraulique
0.3.1 Expérimentations d’une chasse hydraulique dans un collecteur parisien
0.3.2 Résultats des analyses expérimentales
0.4 Étude numérique de la chasse hydraulique
0.3.1 Présentation des modèles
0.3.2 Comparaison des résultats de deux modèles
0.5 Conclusions générales
CHAPTER 1 INTRODUCTION
1.1 General background
1.2 Aims and objectives
1.3 Synopsis and feature of current thesis
CHAPTER 2 LITERATURE REVIEW ON SEDIMENT TRANSPORT UNDER THE SEWER FLUSHING
2.1 Sediment-transport mechanisms in open channels
2.1.1 Generalities on hydrodynamics and sediment transport
2.1.2General aspects of sediment transport in open channels
2.2 In-sewer solids
2.2.1 Generalities
2.2.2 Negative effects of sediments in sewer networks
2.2.3 Content of deposited load in sewers
2.2.4 Consolidation of deposits in combined sewers
2.3 Movement of solids in sewers
2.3.1 Deposition (settling) and accumulation of sediments in sewers
2.3.2 Erosion of sewer deposits
2.3.3 Transport of sediments
2.3.4 Available studies concerning modelling sewer sediment transport
2.4 Sewer cleaning methods
2.4.1 Sewer flushing
2.4.2General evaluation of flush performance
2.5 Experimental and Numerical investigations on flushing
2.5.1 Experimental analysis of flushing in sewers
2.5.2 Laboratory studies
2.5.3 Numerical studies of flushing in sewers
CHAPTER 3 EXPERIMENTAL METHODOLOGY AND MEASUREMENT CAMPAIGN
3.1 Generality
3.2 The experimental pilot sewer channel
3.2.1Aim of the flushing test and choice of the pilot channel
3.2.2Characteristics of the pilot system
3.3 Protocol of the flush experimentation
3.3.1 Phases of the flush test
3.3.2 Measuring flow- and sediment-related parameters
3.3.3 Video recording during the flush
CHAPTER 4 RESULTS OF THE FIELD EXPERIMENTS
4.1 Recorded data during the experiment
4.1.1 Collected data and missing information
4.1.2 Data preparation
4.2 Results of the experimental test
4.2.1 Gate operation during the test
4.2.2 Videos recorded from surface and cunette cameras
4.2.3 Analysis of the hydrodynamics of the flush operation
4.2.4 Deposit evolution due to the flush
4.2.5 Modification of the deposit grain-size distribution
4.2.6 Organic fraction in bed sediments
4.2.7 Complementary parameters
4.3 Performance of the experimental flushing test in Des Coteaux combined sewer
CHAPTER 5 UNSTEADY FLOW NUMERICAL MODELLING OF SEDIMENT TRANSPORT UNDER SEWER FLUSHING
5.1 General overview
5.2 The unsteady flow model for uniform sediment transport
5.2.1 General introduction to the flushing mechanism
5.2.2 Governing equations for flow and sediment phases
5.2.3 Bed-load transport evaluation
5.2.3 Numerical scheme and solution
5.2.4 Domain discretization
5.2.5 Initial and boundary conditions
5.3 The unsteady flow model for non-uniform sediment transport
5.3.1 Governing equations for flow and sediment phases
5.3.2 Scheme, initial and boundary conditions in non-uniform model
CHAPTER 6 MODEL APPLICATION TO THE FLUSH EXPERIMENT PARIS SEWER
6.1 Data preparation for simulation by both uniform and non-uniform sediment-transport models
6.1.1 Modelling the geometry of the sewer channel
6.1.2 Basic input data for the uniform sediment-transport model
6.1.3 Basic input data for the non-uniform sediment-transport model .
6.1.4 Initial, internal and boundary conditions for uniform and non-uniform sediment-transport approaches
6.2 Results from the simulations with the uniform sediment-transport model
6.2.1Results of the hydraulics of the flush
6.2.2Results concerning the sediment-bed evolution
6.3 Results from the simulation with the non-uniform sediment-transport model
6.3.1 Model consistency test
6.3.2 Hydraulics of the flush
6.3.3 Results of the sediment-transport processes
6.4 Sensitivity analysis of the model parameters
CHAPTER 7 CONCLUSIONS AND FUTURE PERSPECTIVES
7.1 Summary and general conclusions
7.2 Future works and perspective
REFERENCES
APPENDIXES
