Developing an Ecological and Migration System for Ichthyofauna on the Crişul Repede River Near the City Hall of Oradea

Abstract

proposes a technical solution to facilitate fish migration upstream the weir located on Crişul Repede River, near the Ferdinand Bridge from the Oradea Town. The proposed solution provides building of a system to facilitate fish migration, placed on the left bank of Crişul Repede, meant to restore the longitudinal connectivity of Crişul Repede River in front of the Ferdinand Bridge weir and to facilitate the access of the migratory fish species to upstream breeding habitats. The proposed migration system are based on the gravitational fall of water and will lead to the restoration of the longitudinal connection of the Crişul Repede River near the weir selected as case study, and will reconnect a habitat with a length of approximately 4 km, that will contribute to insuring of optimal conditions for developing migratory fish species present in the area

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

“…The hydromorphological pressures created by the presence of transversal constructions can lead to the interruption of longitudinal connectivity of rivers (Fehér et al 2012). Addressing flow regime modifications and migration/mobility stoppages are of high importance, but practically-engineered designs are becoming more available and consulted upon to restore natural systems (Kay and Voicu, 2013).…”

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). Limiting rivers only to minor river bed due to various hydraulic works, agricultural works, and industrial areas and construction of houses near rivers affects the functioning of these lotic ecosystems (Voicu and Voicu, 2015).…”

Principle and Design of Hatch Operation System for Fish Migrating Upstream-Downstream of the Discharge Sill

“…Although the impacts of dams on geomorphology and thermal regimes will remain, fish passage systems can provide some relief for migratory fish species in cases where dam removal is not an option. The subject of this article represents a European theme of great topicality and interest; the restoration of the water courses affected by hydromorphological pressures created by the presence of transversal works which lead to the interruption of longitudinal connectivity in rivers, halting fish migration and modifying the flow regime [Kay and Voicu 2013]. The need for longitudinal connectivity of watercourses is an essential condition of the Water Framework Directive approved by the European community and therefore it should be applied to all streams containing migratory species [Voicu and Merten 2014].…”