Recent publications

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Communs et services urbains : un croisement fructueux ?
Bernard de Gouvello, Sylvy Jaglin
, Metropolis / Université Paris-Est Marne la Vallée 2021, N° 124-125 (2), pp.1-11. ⟨10.3917/flux1.124.0001⟩
Microplastic and microfiber fluxes in the Seine River: Flood events versus dry periods
Robin Treilles, Johnny Gasperi, Romain Tramoy, Rachid Dris, Anaïs Gallard, Chandirane Partibane, Bruno Tassin
, Elsevier, 2021, pp.150123. ⟨10.1016/j.scitotenv.2021.150123⟩
Transfer dynamics of macroplastics in estuaries – New insights from the Seine estuary: Part 3. What fate for macroplastics?
R. Tramoy, Johnny Gasperi, L. Colasse, C. Noûs, B. Tassin
, Elsevier, 2021, 169, pp.112513. ⟨10.1016/j.marpolbul.2021.112513⟩
Assessing the thermal regime of poorly monitored reservoirs with a combined satellite and three-dimensional modeling approach
Najwa Sharaf, Bruno J. Lemaire, Ali Fadel, Kamal Slim, Vinçon-Leite Brigitte
, Taylor & Francis, 2021, 11 (3), pp.302-314. ⟨10.1080/20442041.2021.1913937⟩
Evaluation of trace metal accumulation in six vegetable crops intercropped with phytostabilizing plant species, in a French urban wasteland
Xavier Laffray, Kamal Toulaïb, Clarisse Balland-Bolou-Bi, Matthieu Bagard, Luis Leitao, David Huguenot, Vanessa Alphonse, Samir Abbad-Andaloussi, Alexandre Livet, Noureddine Bousserrhine, Juliette Leymarie, Anne Repellin
, Springer Verlag, In press, ⟨10.1007/s11356-021-14512-2⟩

Supervisory authorities

Member of


The Water, Environment and Urban Systems Laboratory (Leesu) is a research group shared by École des Ponts ParisTech and Université Paris-Est Créteil (Research group numbered 200920634U)

Director : Régis Moilleron

Deputy Director : Marie-Christine Gromaire
Deputy Director : Gilles Varrault

The research object of Leesu is urban water, through various approaches:

  • Hydrological and physical studies (water runoff, transfer through urban systems, lake studies),
  • Biogeochemical studies about emissions, fate and impacts of chemical and microbiological contaminants in the city/device/receiving environment continuum,
  • Studies about politics, water uses, practices and their evolutions.

The Leesu develops a multi- and interdisciplinary research, an applied and involved research in environmental sciences. Our research is in line with major societal issues such as the development of a sustainable city that is resilient to change, the optimization of water resources, the protection of groundwater and aquatic ecosystems...

Its ambition is to develop innovative concepts for sustainable water management in a resilient city, founded in fields of expertise developed in the last 10 years: modeling and the use of models, micro-pollutants and pathogens in human-impacted catchment basins, multiscale approaches, limnology, urban water uses, and urban planning. The approach is interdisciplinary, a balance between in situ observations and/or in controlled lab conditions, and their interpretation, culminating in quantitative and predictive models.

Long-lasting partnerships

Leesu anchors its activities in close and lasting operational partnerships with local authorities in the Paris region and with industrial companies in the water sector.

These partnerships are developed in the Urban Hydrology Observatory OPUR and relies on high-frequency data acquisition, field monitoring devices, as well as Chemical and microbiological analytical platforms. Various sociological investigation techniques (qualitative and quantitative) are also used to understand the social and political uses as well as the implementation of water solutions.

In France, Leesu is a major actor in the field of urban hydrology and has close relationships with other similar observatories, OTHU (Lyon) and ONEVU (Nantes), members of the URBIS network. Leesu is also a member of an Observatory of alpine lakes (OLA). Leesu researchers are also members of national working groups (ANSES, AFNOR, ASTEE, CEP).

International collaborations

Leesu members have close and long-term international collaborations with Brasil (UFMG) and Lebanon (Université Libanaise and Lebanese National Research Center). Since 2014, partnerships have been developed with China and projects started with Vietnam and Africa.
Leesu members are also involved in international scientific networks:

  • Working Group of the Joint committee of urban drainage (IWA/IAHR)
  • Working Group Microplastics of the ISO
  • NORMAN network (Network of reference laboratories, research centres and related organisations for monitoring of emerging environmental substances)

Leesu introduction - DON’T DELETE

LEESU website in english. This article must not be deleted

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Leesu organisation

Leesu administrative organisation, Lab Council and Scientific committee

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Leesu in numbers

Some figures on Leesu members and scientific production

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Leesu highlights from 2014 to 2018

Le Leesu a identifié trois «faits marquants» au cours de la période 2014 - 2018. Plus que des réalisations ponctuelles, ils correspondent à des évolutions structurelles profondes dans la stratégie de (...)

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Leesu archives

Leesu data prior to 2016

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