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Benjamin GRELIER - Dr. en hydroclimatologie-hydrologie


University degrees:

Doctoral degree in Geography of University of Lorraine (France) and in Sciences and Technologie of University of Liège (Belgium).

Master degree in Geography of University of Lorraine (France), in the field of Water resources - Management and Planning.

Engineering degree in International Agro-Development of ISTOM (France).



My doctoral works set up at the interface of areas of climatology, hydrology and hydraulic. Ojectives of me PhD thesis was to carry up a climate change impact study on hydrological hazards (low and high flows) in the transnational Meuse basin (France, Belgium). It was co-directed by Gilles DROGUE of the LOTERR lab (Univ. Lorraine) and Michel PIROTTON of the HECE lab (Univ. Liège).

Following my objectives, research axes are as following:

- statistical study of links between meso-scale atmospheric circulation and surface hydrological/climatological variables;

- statistical regionalization of IPCC/CMIP-5 outputs and reconstitution of historical series;

- rainfall-runoff empirical global modelling and frequency analysis;

- use of hydraulic modelling for river-overflow analysis.


Current research projects involvements/interests:

- Meuse model intercomparison study: transnational (NL, B, D, L, F) volontary effort on comparing hydrological models and symposiums on the Meuse basin.

- Chimere 21: research project on climate change impacts on low flows in the french part of the Meuse basin (project leader: IRSTEA),

- RECRET: Reconstitution of historical high and low flows in the french Moselle basin (leader: LOTERR, Univ. Lorraine),

- EPAMA partnership: production of hydrological projections for subcatchments of the french Meuse basin (EPAMA: public territorial basin institute).




My Master 2 works consisted in carrying on a hydromorphological diagnosis on two small rivers in the north of Alsace (France) and propose a plan of renaturation measures.


For my final engineering study works, I carried on a diagnosis on soil degradation in a small catchment mainly used for vetiver and subsitence crops in Haïti, based on a coupled physical and agro-socio-economic approach, and proposed a set of agro-environmental measures for ravine and fields planning.



I was in charge of a 64 h/year teaching commitment (2015/2016, 2016/2017) during my PhD contract.

Teaching fields:

- basis notions and concepts in physical geography: géology and biogeography (Bachelor 1),

- tutorials in urban heat island (Bachelor 1),

- tutorials in flood risk study and management (Bachelor 1),

- tutorials in basic computer and desktop tools (Bachelor 1),

- tutorials in hydrologic analysis programming, Scilab (Master 2).

Responsabilities: courses and teaching preparation, short field trip accompagnying and management, student assessment preparation and marking, participation to semestrial department jury.


Skills and tools


- statistical methods and analysis: multivariate regressions, classification, frequency analyisis,

- modelling: regionalisation, hydrological modelling (GR4J), use of hydraulic modelling (WOLD 1D),

- computing programmation: formatting, processing and data analysis and graphic representation (Matlab, Scilab),

- GIS: database, spatial processing, cartography (Qgis),

- desktop: MS and Libreoffice Suite, LaTeX,

- computer environment: Windows, Linux (Ubuntu),

- oral presentation, scientific/popularization and report writing,

- field and interview survey preparation and conducting.



- french: mother tong,

- english: operationnal (understanding, speaking, writing),

- spanish: basis (understanding, speaking, writing).




Article dans une revue3 documents

  • B. Grelier, Gilles Drogue, Michel Pirotton, Pierre Archambeau, Emilie Gernez. Peut-on estimer l'effet du changement climatique sur l'écoulement à l'exutoire d'un bassin sans modèle pluie-débit ? Un test de la méthode de transfert climat-écoulement par régression dans le bassin transnational de la Meuse. Climatologie, Association internationale de climatologie, 2017, 14 (Volume 14), pp.48-81. 〈http://lodel.irevues.inist.fr/climatologie/index.php?id=1232〉. 〈10.4267/climatologie.1232〉. 〈hal-01695680〉
  • T. De Boer-Euser, L. Bouaziz, J. De Niel, C. Brauer, B. Dewals, et al.. Looking beyond general metrics for model comparison - lessons from an international model intercomparison study. Hydrology and Earth System Sciences, European Geosciences Union, 2017, 21, pp.423-440. 〈10.5194/hess-21-423-2017〉. 〈hal-01586363〉
  • T. De Boer-Euser, L. Bouaziz, C. Brauer, G. Drogue, F. Fenicia, et al.. Looking beyond general metrics for model evaluation - lessons from an international model intercomparison study. Geophysical Research Abstracts, 2016, 18. 〈hal-01714397〉

Communication dans un congrès3 documents

  • B. Grelier, Gilles Drogue, Michel Pirotton, Pierre Archambeau. Testing the climatic resilience to floods on the Ourthe River, Belgium. “Resilience to Global Changes - Anticipating the Unexpected”, Seventh International Conference on Flood Management (ICFM7), Sep 2017, Leeds, United Kingdom. 2017, 〈http://www.icfm7.org.uk/〉. 〈hal-01684878〉
  • B. Grelier, Gilles Drogue, Michel Pirotton, Pierre Archambeau, Benjamin Dewals. An alternate approach for assessing impacts of climate change on water resources : Combining hazard likelihood and catchment sensitivity. Erpicum Sébastien; Dewals Benjamin; Archambeau Pierre; Pirotton Michel. 4th IAHR Europe Congress, Jul 2016, Liège, Belgium. CRC Press, Sustainable Hydraulics in the Era of Global Change, 〈http://www.iahr2016.ulg.ac.be/〉. 〈hal-01679767〉
  • B. Grelier, Gilles Drogue. Comment introduire de la "bonne incertitude" dans les projections climatiques ? Vers la construction d'un "stress-test" climatique dans le bassin transnational de la Meuse.. Erpicum Michel. XXVIIIème Colloque de l’AIC, Jul 2015, Liège, Belgique. Modélisation & Variabilités, 2015, 〈http://www.climato.be/aic/colloques.html〉. 〈hal-01679862〉

Thèse1 document

  • B. Grelier. Aléa climatique et débits des cours d’eau dans le bassin transnational de la Meuse - Co-variabilité, changements possibles et impact sur les débordements. Hydrologie. Université de Lorraine; Université de Liège, 2017. Français. 〈NNT : 2017LORR0243〉. 〈tel-01706685v2〉