期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 771, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2020.144768
关键词
Dams; Restoration ecology; Stream connectivity; Multicriteria analysis; Invasive species control
资金
- Project Reviving Douro Basin - MAVA
- Foundation pour la Nature
- GEOTA-Grupo de Estudos de Ordenamento do Territorio e Ambiente
- FCT-Portuguese Foundation for Science [UIDB/04033/2020]
- FCT-Portuguese Foundation for Science and Technology [UIDB/00616/2020]
The study focused on prioritizing dam removal in the Portuguese part of Douro River, mainly considering obsolete barriers (small dams, weirs). A spatial multicriteria decision analysis (GIS-MCDA) was used for prioritization, taking into account a diversity of parameters such as connectivity and fish biodiversity losses, habitat degradation, negative effects on water quality and ecological conditions, and socio-economic factors.
The longitudinal dimension of river connectivity has been significantly disrupted by barriers to compensate for water demand in the long periods of water scarcity in the Iberian Peninsula. The scale of this modification is widespread in the Portuguese part of Douro River network where, side to side with agriculture water demand, there is a constant increase in hydropower production. Thus, native species in Iberian freshwater systems, performing reproductive migrations along the rivers, are strongly affected by the amplification of fragmentation caused by the tremendous density of transversal obstacles in this river basin. We aimed to prioritize dam removal in the Portuguese part of Douro River, mainly considering obsolete barriers (small dams, weirs) based on a spatial multicriteria decision analysis (GIS-MCDA) based on a prioritization procedure. A diversity of parameters were used to prioritize (rank) the dam's suitability for removal, considering the losses of connectivity and fish biodiversity, habitat degradation, negative effects on water quality and ecological conditions, and socio-economic factors. Different weights were assigned to the different attributes in each criterion according to their importance. The analysis also included a significant constraint: the potential spreading of exotic invasive fish species if connection was reestablished through dam removal. This procedure started with the georeferencing of 1201 transversal obstacles that were further characterized for their relative permeability to fish migration. In conclusion the model used allowed to identify 158 priority barriers, as well as the 5 most fragmented tributaries, which means the most impacted by river regulation. In 8 cases the barriers were big dams (> 15 m), whereas in the remaining 150 were weirs. From a final rank of 20 most impacting structures, the MCDA results also identified two cases where potential removal could trigger the additional impact to native fish species related to the sprawl of alien populations. (C) 2021 Elsevier B.V. All rights reserved.
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