Facilitation Fish Migration above the Discharge Sill Located on the Ialomiţa River Near Cave Ialomicioara

Abstract

Longitudinal connectivity restoration of watercourses is a major duty for scientists (biologists, hydro engineers, chemists etc.) that, by the means of technical exchange via conferences, projects, workshops, universities, and institutions demonstrate the major importance of a natural (non-anthropic) function of the lotic ecosystems. On the Ialomiţa River, the discharge sills located downstream from Padina chalet block the migration of some fish species, such as the brown trout (Salmo trutta) and the bullhead (Cottus gobio), prohibiting access to foraging areas and springs. Water Framework Directive 60/2000 / EC provides a legal framework for restoring "good status" of longitudinal and lateral connectivity of watercourses. Our proposed solution I can be applied to other discharge sills and dams sized between 3m and 6m high, and, where feasible can utilize existing power sources of some discharge sills. Solution II's concepts allow the dimples inside the concrete plate to serve as a rest and recovery area for migratory species. Such benefits that ensure upstream/downstream fish migration while allowing discharge management to continue is unattainable in conventional systems. After solution II is applied the discharge sill does not lose any baseline characteristics while maintaining the original hydro-technical design objective, flood dissipation.

Difficulties With Existing Fish Passes and Their Renovation. The Pool Fish Pass on Dłubnia River in Krakow

“…Projects of unclogging the existing barriers in a form of either dams with inactive fish passes or water barrages without any systems supporting migration of fish were implemented on the rivers: Ialomiţa, Somes Mic and Micheşul, Someşul and Hârtibaciu in the Romanian Carpathians. As a result, bypasses for fish were designed, riffles with increased roughness and fish ladders (Voicu and Bretcan, 2014;Voicu et al, 2015;Voicu and Dominguez, 2016;Voicu and Miles, 2016;Voicu and Baki, 2017).…”

Technical Solutions to Mitigate Shifting Fish Fauna Zones Impacted by Long Term Habitat Degradation in the Bistra Mărui River – Study Case

“…In accordance with Water Framework Directive, river administrators must restore and maintain the longitudinal and lateral connectivity of rivers (Voicu and Merten, 2014). This is both a priority and a challenge for the specialists in the field (Voicu and Dominguez, 2016;Voicu and Baki, 2017). Restoring longitudinal connectivity is an essential component of the lotic ecosystems functions (Voicu and Breţcan, 2014) and must represent the basis of the protection of watercourses (Voicu et al, 2015).…”

Improvement of lateral connectivity in a sector of River Hârtibaciu (Olt/Danube Basin)

“…For this area which is under anthropic impact it is also necessary to restore the river, the adjacent floodplain and the connectivity between them as much as possible, with the proposed solutions being based on scientific adapted concepts (Voicu and Dominguez, 2016). Disrupted fish migration to wetlands and over cross hydraulic constructions are for design engineers a scientific challenge to be solved (Kay and Voicu, 2013).…”