The fluvial geomorphology of the lower Ebro (2002-2013): bridging gaps between management and research
DOI:
https://doi.org/10.18172/cig.2569Keywords:
sediment transport, sedimentary regime, flow regime, flushing flows, dams, river EbroAbstract
This paper summarises twelve years of research undertaken on the lower River Ebro (NE Spain). The research has been undertaken to achieve a fundamental understanding of the fluvial processes in this large Mediterranean river affected by flow regulation. Dams in the whole basin and, in particular, in the lower section of the river alter the Ebro’s flow and sedimentary regimes, thus affecting its physical and ecological functioning. Data obtained on hydrology, sediment transport and river channel dynamics (i.e. particle mobility, bed structure) have aided the design and implementation of flushing flows since 2002; the main objectives of these artificial releases were the control of excess growth of aquatic vegetation (i.e. macrophytes) and the maintenance of certain sedimentary activity in the channel downstream from the Mequinenza-Ribarroja-Flix Dam complex. Results highlight the sedimentary disequilibrium of the river, with the current sediment load equating to 1% of that estimated at the beginning of the 20th century in the absence of dams and under different land uses. Channel platform changes show that the channel has become more stable since dams were closed and a significant reduction of sediment availability has occurred, together reinforcing the sedimentary disequilibrium of the river. Monitoring of flushing flows has demonstrated their high sediment transport capacity. This suggests that, in combination with other restoration measures such as sediment injections, flushing flows could greatly benefit the riverine ecosystem, reducing macrophyte stands and maximizing the sediment delivery to the lowermost river reaches.
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References
Avendaño, C., Cobo, R., Sanz, M.E. y Gomez, J.L. 1997. Capacity situation in Spanish reservoirs. In Proceedings of the 19th Congress on Large Dams 74 (52), ICOLD, Florence, pp. 849-862.
Batalla, R.J., Vericat, D. 2009. Hydrological and sediment transport dynamics of flushing flows: implications for river management in large Mediterranean rivers. River Research and Applications 25 (3), 297-314.
Batalla, R.J., Vericat, D. 2011. An appraisal of the contemporary sediment yield in the Ebro Basin. Journal of Soils and Sediments 11, 1070-1081.
Batalla, R.J., Kondolf, G.M., Gomez, C.M. 2004. Reservoir-induced hydrological changes in the Ebro River basin, NE Spain. Journal of Hydrology 290, 117-136.
Batalla, R.J., Vericat, D., Palau, A. 2006. Sediment transport during a flushing flow in the lower Ebro River. In Rowan, J.S., Duck, R.W., Werritty, A. (eds.), Sediment Dynamics and the Hydromorphology of Fluvial Systems, IAHS Publication 306,Wallingford, UK, pp. 37-44.
Brune, G.M. 1953. The trap efficiency of reservoirs. Transactions of the American Geophysical Union 34, 407-418.
Church, M., McLean, D.G., Wolcott, J.F. 1987. River bed gravels: sampling and analysis. In Sediment Transport in Gravel-bed Rivers, Thorne, C.R., Bathurst, J.C., Hey, R.D. (eds), JohnWiley, Chichester, pp. 43-88.
Church, M. 2006. Bed material transport and the morphology of alluvial river channels. Annual Review of Earth and Planetary Sciences 34, 325-354.
Dodds, W.K., Biggs, B.J. 2002. Water velocity attenuation by stream periphyton and macrophytes in relation to growth form and architecture. Journal of the North American Benthological Society 21(1), 2-15.
Emmett, W.W. 1980. A field calibration of the sediment trapping characteristics of the Helley-Smith bedload sampler. US Geological Survey Professional Paper, 1139.
Grantham, T.E., Merenlender, A.M., Resh, V.E. 2010. Climatic influences and anthropogenic stressors: An integrated framework for streamflow management in Mediterranean-climate California, U.S.A. Freshwater Biology 55 (Suppl.1), 188-204.
Green, J. 2005. Further comment on drag and reconfiguration of macrophytes. Freshwater Biology 50, 2162-2166.
Guillén, J., Palanques, A. 1992. Sediment dynamics and hydrodynamics in the lower course of a river highly regulated by dams: the Ebro River. Sedimentology 39, 567-579.
Habersack, H.M., Laronne, J.B. 2001. Bed load texture in an alpine gravel bed river. Water Resources Research 37(12), 3359-3370.
Hicks, D.M., Goring, D. 2009. Modifying flushing flows in the Mohawango River to mitigate downstream effects. NIWA Client Report CHC2009-164, November 2009.
Hutchinson, S.E., Sklar, F.H., Roberts, C. 1995. Short-term sediment dynamics in a southeastern USA spartina marsh. Journal of Coastal Research 11, 370-380.
Ibáñez, C., Prat, N., Duran, C., Pardos, M., Munné, A., Andreu, R., Caiola, N., Cid, N., Hampel, H., Sánchez, R.F., Trobajo, R. 2008. Changes in dissolved nutrients in the lower Ebro river: causes and consequences. Limnetica 27 (1), 131-142.
Kellerhals, R., Bray, D.I. 1971. Sampling procedures for coarse fluvial sediments. Journal of the Hydraulics Division ASCE 97 (HY8), 1165-1180.
Kemp, W.M., Boynton, W.R., Stevenson, J.C., Twilley, R.R., Means, J.C. 1983. The decline of submerged vascular plants in the upper Chesapeake Bay: summary of results concerning possible causes. Marine Technology Society Journal 17, 78-89.
Kondolf, G.M. 1998. Hungry water: effects of dams and gravel mining on river channel. Environmental Management 21 (4), 533-551.
Kondolf, G.M., Wilcock, P.R. 1996. The flushing flow problem: defining and evaluating objectives. Water Resources Research 32 (8), 2589-2599.
Ligon, F., Dietrich, W.E., Trush, W.J. 1995. Downstream ecological effects of dams: a geomorphic perspective. BioScience 45 (3), 183-192.
Négrel, P., Roy, S., Petelet-Giraud, E., Millot, R., Brenot, A. 2007. Long-term fluxes of disolved and suspended matter in the Ebro River Basin (Spain). Journal of Hydrology 342, 249-260.
Nikora, V., Larned, S., Nikora, N., Debnath, K., Cooper, G., Reid, M. 2008. Hydraulic resistance due to aquatic vegetation in small streams: field study. Journal of Hydraulic Engineering 134 (9), 1326-1332.
Novoa, M. 1984. Precipitaciones y avenidas extraordinarias en Catalunya. In Jornadas de Trabajo sobre Inestabilidad de laderas en el Pirineo, Barcelona, pp. 1-15.
Palanques, A. 1987. Dinámica sedimentaria, mineralogía y microcontaminantes inorgánicos de las suspensiones y de los sedimentos superficiales en el margen continental del Ebro. PhD Thesis, University of Barcelona, Barcelona.
Palau, A., Batalla, R., Rosico, E., Meseguer, A., Vericat, D. 2004. Management of water level and design of flushing floods for environmental river maintenance downstream of the Riba-roja reservoir (lower Ebro River, NE Spain). HYDRO 2004: A New Era for Hydropower, Porto, Portugal, 18-20 October 2004.
Petts, G.E. 1984. Impounded rivers: perspectives for ecological management. Wiley, New York, 326 pp.
Poulos, S.E., Collins, M.B. 2002. A quantitative evaluation of riverine water/sediment fluxes to the Mediterranean basin: natural flows, coastal zone evolution and the role the dam construction. In S.J. Jones, L.E. Frostick (eds.) Sediment Flux to Basins: Causes, Controls and Consequences, Special Publications 191, Geological Society, London, UK, 227-245.
Prats, J., Dolz, J., Armengol, J. 2009. Variabilidad temporal en el comportamiento hidráulico del curso inferior del río Ebro. Ingeniería del Agua 16 (4), 259-272.
Rice, S., Church, M. 1996. Sampling surficial fluvial gravels: the precision of size distribution percentile estimates. Journal of Sedimentary Research 66 (3), 654-665.
Rørslett, B., Johansen, S.W. 1996. Remedial measures connected with aquatic macrophytes in Norwegian regulated rivers and reservoirs. Regulated Rivers: Research and Management 12 (4-5), 509-522.
Roura, M. 2004. Incidència de l’embassament de Mequinensa en el transport de sòlids en suspensió i la qualitat de l’aigua del riu Ebre. PhD Thesis, Facultat de Biologia, Universitat de Barcelona, Barcelona, 145 pp.
Sabaté, J. 2012. Disseny i planificació d’una actuació pilot de restauració fluvial al tram baix del riu Ebre en base a l’anàlisi i diagnosi de l’evolució morfològica. Projecte de final de grau d’enginyeria forestal, Escola Tècnica Superior d’Enginyeria Agrària (ETSEA), Universitat de Lleida, Lleida.
Sanz, M.E., Avendaño, C., Cobo, R. 1999. Influencia de los embalses en el transporte de sedimentos hasta el río Ebro (España). In Proceedings of the Congress on Hydrological and geochemical processes in large-scale river basins, HIBAM, Shahin, p. 1985.
Shaw, E.M. 1983. Hydrology in Practice. Van Nostrand Reinhold, London, 539 pp.
Shields, A. 1936. Anwendung der Aehnlichkeitsmechanik und der turbulenzforschung auf die Geschiebebewegung [Application of similarity principles and turbulence research to bedload movement]. Mitteilungen der Preußischen Versuchsanstalt für Wasserbau, 26, Preußischen Versuchsanstalt fürWasserbau, Berlin.
Surian, N., Rinaldi, M. 2003. Morphological response to river engineering and management in alluvial channels in Italy. Geomorphology 50, 307-326.
Surian, N., Cisotto, A. 2007. Channel adjustments, bedload transport and sediment sources in a gravel-bed river, Brenta River, Italy. Earth Surface Processes and Landforms 32, 1641-1656.
Tena, A., Batalla, R.J. 2013. The sediment budget of a large river regulated by dams (the lower River Ebro, NE Spain). Journal of Soils and Sediments 13, 966-980.
Tena, A., Batalla, R.J., Vericat, D., López-Tarazon, J.A. 2011. Suspended sediment dynamics in a large regulated river over a 10-year period (the lower Ebro, NE Iberian Peninsula). Geomorphology 125, 73-84.
Tena, A., Batalla, R.J., Vericat, D. 2012. Reach-scale suspended sediment balance Downstream from dams in a large Mediterranean river. Hydrological Sciences Journal 57, 831-849.
Tena, A., Ksiazek, L., Vericat, D., Batalla, R.J. 2013. Assessing the geomorphic effects of a flushing flow in a large regulated river. River Research and Applications 29, 876-890.
Varela, J., Gallardo, A., López de Velasco, A. 1986. Retención de sólidos por los embalses de Mequinenza y Ribarroja. Efectos sobre los aportes al Delta del Ebro, In M. Mariño (ed.), El sistema integrado del Ebro. Madrid, Gráficas Hermes, pp. 200-219.
Vericat, D., Batalla, R.J. 2004. Efectos de las presas en la dinámica fluvial del curso bajo del río Ebro. Cuaternario y Gemorfología 18 (1-2), 37-50.
Vericat, D., Batalla, R.J. 2006. Sediment transport in a large impounded river: the lower Ebro, NE Iberian Peninsula. Geomorphology 79, 72-92.
Vericat, D., Batalla, R.J., García, C. 2006. Breakup and reestablishment of the armour layer in a highly regulated large gravel-bed river: the lower Ebro. Geomorphology 76, 122-136.
Wilcock, P.R., Kondolf, G.M., Matthews, W.V.G., Barta, A.F. 1996. Specification of sediment maintenance flows for a large grave-bed river. Water Resources Research 32 (9), 2911-2921.
Wilcock, R.J., Champion, P.D., Nagels, J.W., Croker, G.F. 1999. The influence of aquatic macrophytes on the hydraulic and physico-chemical properties of a New Zealand lowland stream. Hydrobiologia 416, 203-214.
Williams, G.P., Wolman, M.G. 1984. Downstream effects of dams in alluvial rivers. US Geological Survey, Professional Paper, 1286, 83 pp.
Wolman, M.G. 1954. A method of sampling coarse bed material. Transactions of the American Geophysical Union 35, 951-956.
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