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Benjamin GRELIER - PhD in Hydroclimatology-hydrology


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. The objective of my 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 laboratory (Univ. Lorraine) and Michel PIROTTON of the HECE laboratory (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 (Discharge-duration-Frequency 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.

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


Other professional experiences:

I recently conducted a monitoring & evaluation study as part of an agriculture development program in Malawi (2 catchment areas), aiming at assessing the rate of adoption by beneficiary farmers, of agricultural practices promoted by the project. As a result, recommendations are proposed according to the agricultural and projects contexts (4 months - 2019).


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 (6 months - 2014).


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 (5.5 months - 2012).



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, R),

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

- Field survey & interviews: structured and semi-structured interviews, questionnaire elaboration, construction of a linked entering collected data-database program (LibreOffice Base),

- desktop: LibreOffice, MSOffice, LaTeX,

- computer environment: Windows, Linux (Ubuntu),

- oral presentation, scientific/popularization and report writing,

- study team management & supervision.



- french: mother tong,

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

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




Journal articles6 documents

  • Laurène J E Bouaziz, Fabrizio Fenicia, Guillaume Thirel, Tanja de Boer-Euser, Joost Buitink, et al.. Behind the scenes of streamflow model performance. Hydrology and Earth System Sciences, European Geosciences Union, 2021, 25 (2), pp.1069-1095. ⟨10.5194/hess-25-1069-2021⟩. ⟨hal-03137812v2⟩
  • Claire Delus, Benjamin Grelier, Didier Francois, Gilles Drogue, Jean-Philippe Vidal, et al.. Évaluation et comparaison de séries de précipitations historiques dans des sous-bassins versants de la Meuse et de la Moselle, 1871-2004. climatologie, edp sciences, 2019, 16, pp.52-71. ⟨10.4267/climatologie.1378⟩. ⟨hal-02946283⟩
  • Benjamin Grelier, Pierre Archambeau, Michel Pirotton, Gilles Drogue. Quels scénarios de débordement de l'Ourthe (Belgique) en réponse à une variabilité climatique long terme ?. Physio-Géo - Géographie Physique et Environnement, AERES, 2019, 13, pp.25-51. ⟨10.4000/physio-geo.7423⟩. ⟨hal-02108841⟩
  • 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, edp sciences, 2017, 14, pp.48-81. ⟨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, 2017, 21 (1), 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⟩

Conference papers5 documents

  • C. Delus, B. Grelier, D. Francois, G. Drogue, Jean-Philippe Vidal, et al.. Comparaison de séries climatiques historiques dans les bassins versants de la Meuse et de la Moselle. Bases de données et modèles climatiques. Séminaire de la commission "Changements climatiques et territoires" du CNFG, CRC, Mar 2019, Dijon, France. pp.23. ⟨hal-02609259⟩
  • 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), water@leeds (water research centre at the University of Leeds), Sep 2017, Leeds, United Kingdom. ⟨hal-01684878⟩
  • B. Grelier, Gilles Drogue, Michel Pirotton, Pierre Archambeau, Benjamin J. Dewals. An alternate approach for assessing impacts of climate change on water resources : Combining hazard likelihood and catchment sensitivity. 4th IAHR Europe Congress, University of Liege - ArGEnCo Department - Hydraulics in environmental and civil engineering (HECE), Jul 2016, Liège, Belgium. ⟨hal-01679767⟩
  • L. Bouaziz, T. de Boer-Euser, C. Brauer, G. Drogue, F. Fenicia, et al.. Looking beyond general metrics for model evaluation - lessons from an international model intercomparison study. EGU General Assembly 2016, Apr 2016, Vienna, Austria. pp.1. ⟨hal-02603438⟩
  • 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.. 28ème Colloque de l’AIC, Université de Liège - Faculté des Sciences - Laboratoire de Climatologie, Jul 2015, Liège, Belgique. ⟨hal-01679862⟩

Conference poster1 document

  • Hajar El Khalfi, Claire Lang-Delus, Gilles Drogue, Sébastien Lebaut, Luc Manceau, et al.. Low flow characterization and forecasting in a non-stationary context. The XIth Scientific Assembly of the international Association of Hydrological Sciences, May 2022, Montpellier, France. ⟨hal-03705434⟩

Theses1 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⟩