Frédéric Soulignac
École des ponts ParisTech
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Publication
Featured researches published by Frédéric Soulignac.
FEMS Microbiology Ecology | 2015
Adélaïde Roguet; Grégory S. Laigle; Claire Thérial; Adèle Bressy; Frédéric Soulignac; Arnaud Catherine; Gérard Lacroix; Ludwig Jardillier; Céline Bonhomme; Thomas Lerch; Françoise Lucas
Over the past decade, neutral theory has gained attention and recognition for its capacity to explain bacterial community structure (BCS) in addition to deterministic processes. However, no clear consensus has been drawn so far on their relative importance. In a metacommunity analysis, we explored at the regional and local scale the effects of these processes on the bacterial community assembly within the water column of 49 freshwater lakes. The BCS was assessed using terminal restriction fragment length polymorphism (T-RFLP) of the 16S rRNA genes. At the regional scales, results indicated that the neutral community model well predicted the spatial community structure (R(2) mean = 76%) compared with the deterministic factors - which explained only a small fraction of the BCS total variance (less than 14%). This suggests that the bacterial compartment was notably driven by stochastic processes, through loss and gain of taxa. At the local scale, the bacterial community appeared to be spatially structured by stochastic processes (R(2) mean = 65%) and temporally governed by the water temperature, a deterministic factor, even if some bacterial taxa were driven by neutral dynamics. Therefore, at both regional and local scales the neutral community model appeared to be relevant in explaining the bacterial assemblage structure.
Environmental Modeling & Assessment | 2017
Frédéric Soulignac; Brigitte Vinçon-Leite; Bruno J. Lemaire; José Rodolfo Martins; Céline Bonhomme; Philippe Dubois; Yacine Mezemate; Ioulia Tchiguirinskaia; Daniel Schertzer; Bruno Tassin
Urban lakes provide many ecosystem services, e.g., flood control, nature protection, coolness island, recreation. Hydrodynamic models will increasingly be used to enhance these benefits. We present the first validation of a three-dimensional (3D) hydrodynamic model on a small shallow lake with high resolution and high frequency measurements. Lake Créteil, France (area 0.4 km2, mean depth 4.5 m, and catchment area 1 km2) is a former gravel pit and now part of a regional park. The model Delft3D-FLOW was calibrated on a one-month period, with continuous measurements of temperature at five depths at the center of the lake and at three depths at two other stations, and with current speed profiles at the centre of the lake. The model was then verified on 18 1-month periods with similar temperature measurements. The model reproduced very well the temperature dynamics, including the alternation between mixing and stratification periods and internal wave patterns. The mean absolute errors over the five depths at the central point remained below 0.55∘C in spring and summer, the most favorable seasons for phytoplankton growth. Horizontal temperature differences, which rose up to 3∘C at the beginning of stratification periods, were also well reproduced, as well as current speeds. These results are very promising for assessing nutrient and pollutant diffusion, settling and resuspension, as well as for understanding how phytoplankton blooms start in small shallow lakes.
Archive | 2019
Yi Hong; Chenlu Li; Bruno J. Lemaire; Frédéric Soulignac; José Rodolfo Martins; Adélaïde Roguet; Françoise Lucas; Brigitte Vinçon-Leite
Urban stormwater discharges contribute to the fecal contamination of recreational lakes. It is essential to assess the spatial and temporal distribution of fecal bacterial indicators in the receiving waterbodies, to prevent public health risks. This study develops for the first time in continental waters an integrated monitoring and modelling approach, linking the SWMM and Delft-3D models and including a detailed monitoring of the stormwater discharge and at different points of the lake, for assessing Escherichia coli (E.coli) dynamics in stormwater discharges and the receiving urban lake. This integrated approach is applied to a recreational shallow lake and its adjacent urban catchment, with a single stormwater outlet which discharges into the lake. The SWMM model parameters are calibrated and validated with continuous measurements of the flow rate and mean concentration of E. coli in the stormwater discharge measured during each rainfall event. Using the simulated flow rate and E. coli concentration at the sewer outlet, the Delft3D-FLOW-WAQ model simulates E. coli transport in the urban lake with previously calibrated hydrodynamic parameters and default values of E. coli parameters. Comparing simulations with E. coli concentrations measured at different points in the lake, this integrated modelling approach yields promising results. Further studies will focus on the development of automatic model coupling and parameter optimisation, as well as on the evaluation of long-term impacts and management scenarios.
Environmental Modelling and Software | 2018
Louise Bruce; Marieke A. Frassl; George B. Arhonditsis; Gideon Gal; David P. Hamilton; Paul C. Hanson; Amy L. Hetherington; John M. Melack; Jordan S. Read; Karsten Rinke; Anna Rigosi; Dennis Trolle; Luke Winslow; Rita Adrian; Ana I. Ayala; Serghei A. Bocaniov; Bertram Boehrer; Casper Boon; Justin D. Brookes; Thomas Bueche; Brendan D. Busch; Diego Copetti; Alicia Cortés; Elvira de Eyto; J. Alex Elliott; Nicole Gallina; Yael Gilboa; Nicolas Guyennon; Lei Huang; Onur Kerimoglu
Ecological Modelling | 2017
Onur Kerimoglu; Stéphan Jacquet; Brigitte Vinçon-Leite; Bruno J. Lemaire; Frédéric Rimet; Frédéric Soulignac; Dominique Trevisan; Orlane Anneville
Journal of Great Lakes Research | 2018
Frédéric Soulignac; Pierre-Alain Danis; Damien Bouffard; Vincent Chanudet; Etienne Dambrine; Yann Guénand; Tristan Harmel; Bastiaan Willem Ibelings; Dominique Trevisan; Rob Uittenbogaard; Orlane Anneville
5th IAHR Europe Congress – New challenges in hydraulic research and engineering | 2018
Vinçon-Leite Brigitte; Francesco Piccioni; Bruno J. Lemaire; Yi Hong; Denis Plec; Céline Casenave; Frédéric Soulignac
XXXIII Congress – International Society of Limnology | 2016
Brigitte Vinçon-Leite; Bruno J. Lemaire; Frédéric Soulignac; Arthur Scriban; Honorine Roche; Xi Jiang; Philippe Dubois; Raphael Peiffer; Denis Plec; Arnaud Catherine; Catherine Quiblier; Jean-François Humbert; Cécile Bernard
Journée scientifique du SOERE OLA « Modélisation des écosystèmes lacustres » | 2016
Frédéric Soulignac; Bruno J. Lemaire; José Rodolfo Martins; Brigitte Vinçon-Leite
9th Symposium for European Freshwater Sciences | 2015
Adélaïde Roguet; Frédéric Soulignac; José Rodolfo Martins; José Alves de Sousa; Felipe Mendes dos Santos; Bruno J. Lemaire; Françoise Lucas; Brigitte Vinçon-Leite