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Diversion works
Published in P. Novak, A.I.B. Moffat, C. Nalluri, R. Narayanan, Hydraulic Structures, 2017
P. Novak, A.I.B. Moffat, C. Nalluri, R. Narayanan
The fish ladder proper consists of a series of traverses (cross-walls) and pools circumventing an obstruction (such as a weir or dam) for the fish to migrate to the head waters in easy stages. This is achieved by creating a series of drops of around 300mm–450mm between pools (Fig. 9.33) on a gradient of around 1 in 8 to 1 in 15 (for high heads). Rest pools of a larger size (normally twice the size of an ordinary pool) are also provided after every 5–6 pools.
Hydroelectricity and Ocean Energy Security
Published in Maria G. Burns, Managing Energy Security, 2019
EnvironmentMinimal environmental pollution: Limited fluid, air-borne, or greenhouse contaminants.There is minimal visual impact, especially if submerged or offshore.Natural landscape may appear industrialized when wave power equipment is installed closer to the coastline or offshore units are in shallow waters.Decreased seashore and leisure activities. The capabilities of greater impact of marine installation sites may possibly decrease marine routes, boating, and amusement locations.Sound disturbances. The motion of attenuators or point absorbers or aquatic motion and absorption in the OWC and overtopping equipment may possibly create excessive persistent sound. However, this sound cannot be considerably higher than the original sound of the ocean waves.Turbines are detrimental to flora and fauna. Ecological infrastructure solutions like fish passages or fish ladders are necessary. Environmental damages may occur in rivers located in the vicinity of dams, impacting nature’s flora and fauna. Several types of fish, like salmon, may be averted from moving upstream to spawn. Fish ladders and other technologies help fish rise up over dams and get into upstream breeding locations. However, the existence of wave power dams modifies their migration habits and damages fauna communities. Hydropower units may also trigger low dissolved oxygen levels within the water, which is damaging to river environments (NREL, 2010).
Renewable Energy
Published in Efstathios E. Michaelides, Energy, the Environment, and Sustainability, 2018
The dams prevent fish migration and restrict the waterways. This ecological impact may be mitigated by the installation of artificial “fish ladders,” where the fish are able to swim upstream in a bypass waterway. Because the turbines harm the salmon spawn, in several reservoirs along the Columbia River, young salmon is transported downstream by barges during the spawning season.
Ichthyoplankton drift through fishway in large dam: effect of hydrology, seasonal patterns and larvae condition
Published in Journal of Ecohydraulics, 2020
Patricia Sarai da Silva, Leandro Fernandes Celestino, Lucileine de Assumpção, Sergio Makrakis, João Henrique Pinheiro Dias, Elaine Antoniassi Luiz Kashiwaqui, Maristela Cavicchioli Makrakis
Fish ladders are structures built to reestablish the connectivity between upstream and downstream habitats fragmented by dams, and they should be based on available habitats and two-way passage (Celestino et al. 2019). Aside from adult movements, the downstream passage of fish eggs and larvae have been proposed as a requirement for an efficient fishway, as stated by Agostinho et al. (2007b) and Pompeu et al. (2012). The fish ladder at Porto Primavera Dam, in the Upper Paraná River, was built in 2001 to connect the downstream floodplain to reservoir tributaries (Celestino et al. 2019; Wagner et al. 2012). These tributaries are critical habitats for spawning, nursery (Da Silva et al. 2015, 2019) and recruitment (Marques et al. 2018). Since 2004 this fish ladder has been evaluated annually, regarding effectiveness, and the behavior of adult migratory movements is monitored (Bido et al. 2018; Celestino et al. 2019; Gutfreund et al. 2018; Makrakis et al. 2007; Wagner et al. 2012). So far, no information exists about the function of the fish ladder as a downstream dispersion route for early life stages of mainly migratory fishes.
Consideration of habitat quality in a river connectivity index for anadromous fishes
Published in Inland Waters, 2019
Amaia A. Rodeles, Pedro M. Leunda, Josu Elso, Jose Ardaiz, David Galicia, Rafael Miranda
Although the accessible spawning habitat for Atlantic salmon was significantly higher in 2016 than in 1992 in the 4 models, it represents only ∼10% of the watershed and is restricted to the middle and lower Bidasoa River basin (Fig. 2a–b, 3a–b). The poor breeding habitat accessibility results are the consequence of dam accumulation. Salmon must overcome numerous dams to reach high-quality spawning sites, and although many dams have fish ladders, these devices are only part of the solution because they slow migration and fatigue fish (Brown et al. 2013).
The role of hydropower in South Asia’s energy future
Published in International Journal of Water Resources Development, 2021
Ramesh Ananda Vaidya, David James Molden, Arun Bhakta Shrestha, Nisha Wagle, Cecilia Tortajada
Finally, on the ecosystem, to minimize the risk to aquatic species, the construction of fish ladders is important. Some impacts on flora and fauna can be mitigated by reducing noise, limiting vehicular movement and increasing awareness (Environment Resource Management (ERM), 2018).