Reduced Models (and control) of in-situ decontamination of large water resources
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1 Reduced Models (and control) of in-situ decontamination of large water resources Antoine Rousseau, Alain Rapaport To cite this version: Antoine Rousseau, Alain Rapaport. Reduced Models (and control) of in-situ decontamination of large water resources. Sino-French Conference on Modeling, Mathematical Analysis and Computation, Jun 2017, Xiamen, China. pp.27, 2017, < <hal > HAL Id: hal Submitted on 21 Jun 2017 HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.
2 Reduced Models (and control) of in-situ decontamination of large water resources Antoine ROUSSEAU, Inria, Team LEMON (Montpellier) In honor of my brother in sciences Claudius June 9th, 2017, SFC2MAC, Xiamen Joint work with Alain Rapaport (INRA) Antoine ROUSSEAU Decontamination of large water resources SFC2MAC, Xiamen 1 / 19
3 Outline 1 Introduction : the Taihu problem 2 A simple ODE model 3 A PDE-based model for the lake 4 Back to ODEs Antoine ROUSSEAU Decontamination of large water resources SFC2MAC, Xiamen 2 / 19
4 Outline 1 Introduction : the Taihu problem 2 A simple ODE model 3 A PDE-based model for the lake 4 Back to ODEs Antoine ROUSSEAU Decontamination of large water resources SFC2MAC, Xiamen 3 / 19
5 Applicative Framework Polluted Taihu (algae), Yangtze Delta plain, Wuxi, China. Courtesy Desert Research Institute Objectives : use a bioreactor to remove pollution from the lake do it as efficiently as possible Antoine ROUSSEAU Decontamination of large water resources SFC2MAC, Xiamen 4 / 19
6 Bioremediation problem Parameters and unknowns - V L and V R the volumes of the resource and bioreactor, - X R the biomass concentration in the bioreactor, - S L and S R the pollutant concentrations, - µ( ) the biomass growth law, - Q = Q(t) the pump discharge, controlled by the user. Antoine ROUSSEAU Decontamination of large water resources SFC2MAC, Xiamen 5 / 19
7 Outline 1 Introduction : the Taihu problem 2 A simple ODE model 3 A PDE-based model for the lake 4 Back to ODEs Antoine ROUSSEAU Decontamination of large water resources SFC2MAC, Xiamen 6 / 19
8 ODE-based model : the homogeneous case S L = S L (t) X R = µ(s R) X R Q V R X R, S R = µ(s R) X R + Q V R (S L S R), S L = Q V L (S R S L), Antoine ROUSSEAU Decontamination of large water resources SFC2MAC, Xiamen 7 / 19
9 ODE-based model : the homogeneous case S L = S L (t) X R = µ(s R) X R Q V R X R, S R = µ(s R) X R + Q V R (S L S R), S L = Q V L (S R S L), Chemostat equations : J. Monod ( ) Antoine ROUSSEAU Decontamination of large water resources SFC2MAC, Xiamen 7 / 19
10 ODE-based model : the homogeneous case S L = S L (t) X R = µ(s R) X R Q V R X R, S R = µ(s R) X R + Q V R (S L S R), Slow-fast approximation : S L = Q V L (S R S L), ε = V R /V L 1 Reference : Gajardo et al, Automatica Antoine ROUSSEAU Decontamination of large water resources SFC2MAC, Xiamen 8 / 19
11 ODE-based model : the homogeneous case S L = S L (t) X R = µ(s R) X R Q V R X R, S R = µ(s R) X R + Q V R (S L S R), Slow-fast approximation : S L = Q V L (S R S L), ε = V R /V L 1 Reference : Gajardo et al, Automatica Theorem (case µ(x) = µ X) For any X R (0) > 0 and S R (0) = S L > 0, our system has a unique global solution. In addition, there exists a critical flow rate Q c > 0, depending on S L, such that asymptotically : if Q > Q c, then ( S R (s), X R (s) ) converges towards (S L, 0), if 0 < Q < Q c, then ( S R (s), X R (s) ) converges towards (S R, X R ) with S R = Q µv R < S L. Antoine ROUSSEAU Decontamination of large water resources SFC2MAC, Xiamen 8 / 19
12 Optimal flow rate for the bioremediation (linear µ) Back to the lake equations... What is the best flow rate Q? S L = Q ( Q S L ), V L µ V R Antoine ROUSSEAU Decontamination of large water resources SFC2MAC, Xiamen 9 / 19
13 Optimal flow rate for the bioremediation (linear µ) Back to the lake equations... What is the best flow rate Q? S L = Q ( Q S L ), V L µ V R Q(t) = µ V R 2 S L(t) Antoine ROUSSEAU Decontamination of large water resources SFC2MAC, Xiamen 9 / 19
14 Optimal flow rate for the bioremediation (linear µ) Back to the lake equations... What is the best flow rate Q? S L = Q ( Q S L ), V L µ V R Q(t) = µ V R 2 S L(t) Antoine ROUSSEAU Decontamination of large water resources SFC2MAC, Xiamen 9 / 19
15 Outline 1 Introduction : the Taihu problem 2 A simple ODE model 3 A PDE-based model for the lake 4 Back to ODEs Antoine ROUSSEAU Decontamination of large water resources SFC2MAC, Xiamen 10 / 19
16 The non-homogeneous case : S L = S L (t, x, y) Navier Stokes & transport equations in the resource u t + u u ν u u + p = 0, S L t u = 0, + u S L ν S S L = 0. Boundary conditions u in(t) = A Q(t), u out(t) = A Q(t), B.C on S L Antoine ROUSSEAU Decontamination of large water resources SFC2MAC, Xiamen 11 / 19
17 Simulations Circular lake : 1 pump Antoine ROUSSEAU Decontamination of large water resources SFC2MAC, Xiamen 12 / 19
18 Comparing models Pollution concentration in the lake with ODE (black) and PDE (red) Antoine ROUSSEAU Decontamination of large water resources SFC2MAC, Xiamen 13 / 19
19 Outline 1 Introduction : the Taihu problem 2 A simple ODE model 3 A PDE-based model for the lake 4 Back to ODEs Antoine ROUSSEAU Decontamination of large water resources SFC2MAC, Xiamen 14 / 19
20 Active and dead zones model New ODE model Ẋ = µ(s R )X Q V R X, S R = µ(s R )X + Q V R (S 1 S R ), S 1 = Q V 1 (S R S 1 ) + d V 1 (S 2 S 1 ), S 2 = d V 2 (S 1 S 2 ). Antoine ROUSSEAU Decontamination of large water resources SFC2MAC, Xiamen 15 / 19
21 Active and dead zones model New ODE model Ẋ = µ(s R )X Q V R X, S R = µ(s R )X + Q V R (S 1 S R ), S 1 = Q V 1 (S R S 1 ) + d V 1 (S 2 S 1 ), S 2 = d V 2 (S 1 S 2 ). Existence, uniqueness, optimal control for two zones Gajardo, Ramírez, Rapaport, Riquelme. Bioremediation of natural water resources via optimal control techniques. BIOMAT 2011, , World Sci. Publ., Hackensack, NJ, Two parameters we can play with : V 1 V 1 + V 2 and d. Antoine ROUSSEAU Decontamination of large water resources SFC2MAC, Xiamen 15 / 19
22 Comparing models (with A. Rapaport and S. Barbier) Optimization on the parameters V 1 V 1 + V 2 and d Pollution concentration in the lake 1 ODE (black) 2 ODEs (blue) Best parameter d vs viscosity ν S (dashed blue) PDE (red) Best meansquare fit (plain red) Antoine ROUSSEAU Decontamination of large water resources SFC2MAC, Xiamen 16 / 19
23 In summary... Antoine ROUSSEAU Decontamination of large water resources SFC2MAC, Xiamen 17 / 19
24 Conclusion The take home message is... we have designed a first model and questioned it, we proposed a more complicated (too much?) one, we took an intermediary model, which seems satisfactory, on which optimal control can be done. Antoine ROUSSEAU Decontamination of large water resources SFC2MAC, Xiamen 18 / 19
25 Conclusion The take home message is... we have designed a first model and questioned it, we proposed a more complicated (too much?) one, we took an intermediary model, which seems satisfactory, on which optimal control can be done. BUT : is the reference (PDE) model a realistic model? Antoine ROUSSEAU Decontamination of large water resources SFC2MAC, Xiamen 18 / 19
26 Conclusion The take home message is... we have designed a first model and questioned it, we proposed a more complicated (too much?) one, we took an intermediary model, which seems satisfactory, on which optimal control can be done. BUT : is the reference (PDE) model a realistic model? Certainly not... Antoine ROUSSEAU Decontamination of large water resources SFC2MAC, Xiamen 18 / 19
27 Conclusion The take home message is... we have designed a first model and questioned it, we proposed a more complicated (too much?) one, we took an intermediary model, which seems satisfactory, on which optimal control can be done. BUT : is the reference (PDE) model a realistic model? Certainly not... The more we fail, the more chances we have to succeed Antoine ROUSSEAU Decontamination of large water resources SFC2MAC, Xiamen 18 / 19
28 Thank you for your attention A few references... P. Gajardo, J. Harmand, H. Ramírez, A. Rapaport and V. Riquelme Minimal time bioremediation of natural water resources. Automatica 2011 P. Gajardo, H. Ramírez, A. Rapaport and V. Riquelme Bioremediation of natural water resources via optimal control techniques. BIOMAT 2012 A. Rousseau Texte public de l agrégation externe de mathématiques A. Rapaport, A. Rousseau and J. Harmand. Procédé de traitement d une ressource fluide, programme d ordinateur et module de traitement associés. Patent No : FA FR , S. Barbier, A. Rapaport et A. Rousseau. Modelling of biological decontamination strategies of a water resource in natural environment. Journ. Sci. Comp, A. Rousseau, A. Rapaport, A. Pacholik and C. Leininger Action Dépollution. Serious game. Antoine ROUSSEAU Decontamination of large water resources SFC2MAC, Xiamen 19 / 19
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