Dr Roser Casas-Mulet

  • Room: Level: 04 Room: 401
  • Building: Engineering Block D
  • Campus: Parkville

Research interests

  • Ecohydraulics
  • Freshwater ecosystems
  • Hyporheic zone
  • Regulated rivers
  • Stream temperature


I am Research fellow in the Department of Infrastructure Engineering at the University of Melbourne. I obtained my PhD in Environmental Engineering at the Norwegian University of Science and Technology, Trondheim, and my MSc and BSc in Forestry Engineering and Natural Resources Management at the University of Lleida, Catalonia, Spain, with a one-year stage at the University of Aberdeen, Scotland, UK.

My general research interests lie on the analysis of environmental changes occurring in rivers, particulary in regulated systems where more often difficult decisions on how best to balance water demands and environmental protection need to be made. I have experience in the topic from both a pure research and applied angles, providing me with the view that firm scientific understanding on environmental processes should be the base for the management of aquatic ecosystems.

To date, my lines of research have focused on the interlinks between physical and ecological processes in freshwater ecosystems. I have studied river systems at several spatial scales, from the biological response to physical changes in the hyporheic zone (patch-scale), the hydraulic modelling of dynamic mesohabitats and drying-out areas at the reach scale, to the analysis of environmentally friendly hydropower operations at the catchment scale.

Currently, following up from my PhD research, I am interested on the physical processes occurring in the the hyporheic zone and areas of groundwater upwelling during  hydrological disturbances (flood, drought) in extreme climatic conditions (heat, cold). I am particularly interested in the role of these areas to buffer extreme water temperatures, and their potential to serve as aquatic ecology refugia for key organisms. Such research will be very valuable for the future management of regulated rivers in the context of a changing climate.

Recent publications

  1. Miller, KA.; Casas-mulet, R.; De Little, SC.; Stewardson, MJ.; Koster, WM.; Webb, JA. Deficiencies in our understanding of the hydro-ecology of several native Australian fish: a rapid evidence synthesis. Marine and Freshwater Research. CSIRO PUBLISHING. 2018, Vol. 69, Issue 8, pp. 1208-1221. DOI: 10.1071/MF17241
  2. De Little, SC.; Casas-mulet, R.; Patulny, L.; Wand, J.; Miller, KA.; Fidler, F.; Stewardson, MJ.; Webb, JA. Minimising biases in expert elicitations to inform environmental management: Case studies from environmental flows in Australia. Environmental Modelling & Software. ELSEVIER SCI LTD. 2018, Vol. 100, pp. 146-158. DOI: 10.1016/j.envsoft.2017.11.020
  3. Casas-mulet, R.; Lakhanpal, G.; Stewardson, MJ. The relative contribution of near-bed vs. intragravel horizontal transport to fine sediment accumulation processes in river gravel beds. Geomorphology. ELSEVIER SCIENCE BV. 2018, Vol. 303, pp. 299-308. DOI: 10.1016/j.geomorph.2017.12.013
  4. Arora, M.; Casas-mulet, R.; Costelloe, JF.; Peterson, TJ.; Mccluskey, AH.; Stewardson, MJ. IMPACTS OF HYDROLOGICAL ALTERATIONS ON WATER QUALITY. . ACADEMIC PRESS LTD-ELSEVIER SCIENCE LTD. 2017, pp. 101-126. DOI: 10.1016/B978-0-12-803907-6.00006-1
  5. Casas-mulet, R.; Alfredsen, KT.; Mccluskey, AH.; Stewardson, MJ. Key hydraulic drivers and patterns of fine sediment accumulation in gravel streambeds: A conceptual framework illustrated with a case study from the Kiewa River, Australia. Geomorphology. Elsevier BV. 2017, Vol. 299, pp. 152-164. DOI: 10.1016/j.geomorph.2017.08.032
  6. Casas-mulet, R.; Alfredsen, KT.; Mccluskey, AH.; Stewardson, MJ. Key hydraulic drivers and patterns of fine sediment accumulation in gravel streambeds: A conceptual framework illustrated with a case study from the Kiewa River, Australia. GEOMORPHOLOGY. ELSEVIER SCIENCE BV. 2017, Vol. 299, pp. 152-164. DOI: 10.1016/j.geomoiph.2017.08.032
  7. Wilkes, MA.; Neverman, AJ.; Casas-mulet, R.; Adeva-bustos, A.; Mccluskey, AH.; Ouellet, V.; Vanzo, D.; Franklin, PA.; Silva, AT. Early careers on ecohydraulics: challenges, opportunities and future directions. Journal of Ecohydraulics. Taylor & Francis. 2016, Vol. 1, Issue 1-2, pp. 102-107. DOI: 10.1080/24705357.2016.1249423
  8. Saltveit, SJ.; Alfredsen, KT.; Casas-mulet, R. Establishing mitigation strategies for salmonid gravel stages in hydropeaking rivers. . The University of Melbourne. 2016, pp. 1-4.
  9. Casas-mulet, R.; Saltveit, SJ.; Alfredsen, KT. Hydrological and thermal effects of hydropeaking on early life stages of salmonids: A modelling approach for implementing mitigation strategies.. Science of The Total Environment. Elsevier BV. 2016, Vol. 573, pp. 1660-1672. DOI: 10.1016/j.scitotenv.2016.09.208
  10. Casas-mulet, R.; Alfredsen, K.; Brabrand, A.; Saltveit, SJ. Hydropower operations in groundwater-influenced rivers: implications for Atlantic salmon, Salmo salar, early life stage development and survival. Fisheries Management and Ecology. WILEY. 2016, Vol. 23, Issue 2, pp. 144-151. DOI: 10.1111/fme.12165
  11. Casas-mulet, R.; Mccluskey, A.; Stewardson, M.; Lakhanpal, G.; Gee, EM. The effect of clogging, bed-forms and bioturbation on hyporheic exchange: experimental studies at the flume scale. 11TH INTERNATIONAL SYMPOSIUM ON ECOHYDRAULICS. The University of Melbourne. 2016.
  12. Casas-mulet, R.; King, E.; Hoogeveen, D.; Duong, L.; Lakhanpal, G.; Baldwin, T.; Stewardson, MJ.; Webb, JA. Two decades of ecohydraulics: trends of an emerging interdiscipline. Journal of Ecohydraulics. Taylor & Francis. 2016, Vol. 1, Issue 1-2, pp. 16-30. DOI: 10.1080/24705357.2016.1251296
  13. Casas-mulet, R.; Lakhanpal, G.; Stewardson, M. Vertical and Horizontal Fine Sediment Accumulation During Fluctuating Flows: Outcomes from Flume Experiments. 11TH INTERNATIONAL SYMPOSIUM ON ECOHYDRAULICS. The University of Melbourne. 2016.
  14. Casas-mulet, R.; Alfredsen, K.; Boissy, T.; Sundt, H.; Ruther, N. PERFORMANCE OF A ONE-DIMENSIONAL HYDRAULIC MODEL FOR THE CALCULATION OF STRANDING AREAS IN HYDROPEAKING RIVERS. River Research and Applications. WILEY-BLACKWELL. 2015, Vol. 31, Issue 2, pp. 143-155. DOI: 10.1002/rra.2734
  15. Casas-mulet, R.; Alfredsen, K.; Brabrand, A.; Saltveit, SJ. Survival of eggs of Atlantic salmon (Salmo salar) in a drawdown zone of a regulated river influenced by groundwater. Hydrobiologia. SPRINGER. 2015, Vol. 743, Issue 1, pp. 269-284. DOI: 10.1007/s10750-014-2043-x
  16. Casas-mulet, R.; Alfredsen, K.; Hamududu, B.; Timalsina, NP. The effects of hydropeaking on hyporheic interactions based on field experiments. Hydrological Processes. WILEY-BLACKWELL. 2015, Vol. 29, Issue 6, pp. 1370-1384. DOI: 10.1002/hyp.10264
  17. Casas-mulet, R.; Saltveit, SJ.; Alfredsen, K. THE SURVIVAL OF ATLANTIC SALMON (SALMO SALAR) EGGS DURING DEWATERING IN A RIVER SUBJECTED TO HYDROPEAKING. River Research and Applications. WILEY. 2015, Vol. 31, Issue 4, pp. 433-446. DOI: 10.1002/rra.2827
  18. Casas-mulet, R.; Alfredsen, K.; GarcĂ­a-escudero Uribe, A. A cost-effective approach to predict dynamic variation of mesohabitats at the river scale in Norwegian systems. International Journal of River Basin Management. Informa UK Limited. 2014, Vol. 12, Issue 2, pp. 145-159. DOI: 10.1080/15715124.2014.917314
  19. Casas-mulet, R.; Alfredsen, K.; Killingtveit, A. Modelling of environmental flow options for optimal Atlantic salmon, Salmo salar, embryo survival during hydropeaking. Fisheries Management and Ecology. WILEY-BLACKWELL. 2014, Vol. 21, Issue 6, pp. 480-490. DOI: 10.1111/fme.12097
  20. Gilvear, DJ.; Spray, CJ.; Casas-mulet, R. River rehabilitation for the delivery of multiple ecosystem services at the river network scale. Journal of Environmental Management. ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD. 2013, Vol. 126, pp. 30-43. DOI: 10.1016/j.jenvman.2013.03.026

View a full list of publications on the University of Melbourne’s ‘Find An Expert’ profile