Numerical simulation of flow in a fishway of Karkheh-Hamidieh diversion dam and environmental considerations to investigate possibility of fishway use in Mazandaran Province

Document Type: Research Paper

Authors

1 Department of Civil Engineering, Tonekabon Branch, Islamic Azad University

2 Ramsar

Abstract

Pool and weir is a type of fishway that provides a route for fish to migrate to dam
upstream. The effective parameters for fish swimming include velocity, water depth and
turbulence. Several rubber dams have been under construction in Mazandaran Province, but
the necessary structures have not been built around them yet. When constructing these rubber
dams, numerical models can be used to evaluate flow velocity and currently in Iran there is
also the possibility of comparing the results with field measurements at Karkhe-Hamidieh
dam of Khuzestan Province. In this paper, the three-dimensional equations governing shallow
water in the weir and orifice fishway were solved using the suitable models of turbulence, and
the flow pattern and turbulence were calculated. The results of flow simulation and field
measurements using Micromollineh were also compared. The final result showed that the
velocity lines in submerged and non-submerged modes with constant velocity were similar to
those estimated by Micromollineh - about 0.469 mps. We suggest it is not necessary to reduce
the flow rate in a submerged state using devices such as baffles. The small Cyprinidae fishes
are able to cross the fishway due to the slow flow of non-submerged state. In case of nonsubmerged
state, there is a need to reduce the flow rate.

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