Numerical modelling of free surface flows on round vertical slot fish passes

Koçal, Çiğdem
Dams and weirs built on the rivers block the flow and prevent fishes from migrating along the river. To overcome this problem, fish passes can be built at those blocked locations along the river by providing a gently sloped channel with low flow rates and enough water depth to allow fish to ascend. Considering the design process, understanding the hydrodynamics inside fish pass structures is important. By using three dimensional numerical simulations, parameters like flow rates, velocity, turbulence and water depth inside the fish pass can be obtained. In this study, a relatively new type of vertical slot fish pass called round vertical slot fish pass is investigated numerically and adopted to Uzungöl Weir-1. Comparing with the previous study of Özkaya (2014) on conventional vertical slot fish passes, it was observed that round vertical slot fish passes have advantage in terms of lower turbulent kinetic energy values inside the resting pools. It is also shown that with numerical modelling different design alternatives can be tested easily without the need of expensive physical models.


Numerical simulation of free surface flows at fish passages /
Özkaya, Kerem; Köken, Mete; Department of Civil Engineering (2014)
Hydroelectric dams build on the rivers block most of the flow section and leaves no space for the migrating fish along the rivers. Fish passages are built along the river at those locations to overcome this problem. Understanding the hydrodynamics inside these structures is essential in the design process. Parameters like discharge, velocity, acceleration and turbulence inside the fish passage can be obtained using three dimensional numerical simulations. Change in these parameters is investigated for diffe...
Evaluation of eutrophication control strategies for the Keban Dam reservoir
Soyupak, S; Mukhallalati, L; Yemisen, D; Bayar, A; Yurteri, C (1997-04-15)
The reservoir of the Keban Dam in eastern Anatolia is a very deep and large water body subject to significant seasonal water level fluctuations within a given hydrological year. At the present time, different sections of the reservoir have different trophic status and the upper portion of the reservoir, in particular, is eutrophic. In this regard, there is a need for the assessment of alternative strategies to be implemented for phosphorus and thus eutrophication control in this segment of the reservoir. In...
Seismic Performance Evaluation of Concrete Gravity Dams by Using Pseudo Dynamic Testing and Simulations
Aldemir, Alper; Binici, Barış (null; 2017-11-24)
Dams are one of the mostimportantinfrastructure components servingfor water storage and energyproduction.Experimental studies on the seismic response of concrete gravity dams are scarce due to the complications regarding thelargescaleof dams and their interaction with the reservoir. This study presents the results of recent novel pseudo-dynamic dam tests (PSD) along with the nonlinear finite element simulations of the specimens. The test specimens were 1/75 scaled version of the highest ...
Hydraulics Near Unscreened Diversion Pipes in Open Channels: Large Flume Experiments
Ercan, Ali; Kavvas, M. Levent; Carr, Kara; Hockett, Zachary; Bandeh, Hossein; Mussen, Timothy D.; Cocherell, Dennis; Poletto, Jamilynn B.; Cech, Joseph J.; Fangue, Nann A. (2017-04-01)
Most of the water diversions on the Sacramento and San Joaquin Rivers (California, United States) and their tributaries are currently unscreened. These unscreened diversions are commonly used for irrigation and are potentially harmful to migrating and resident fishes. A large flume (test section: 18.29 m long, 3.05 m wide and 3.20 m high) was used to investigate the hydraulic fields near an unscreened water diversion under ecologically and hydraulically relevant diversion rates and channel flow characterist...
Numerical modeling of dam breach in concrete gravity dams
mosaddeghi, farshid; Köken, Mete; Aydın, İsmail; Department of Civil Engineering (2021-9-08)
When a dam fails, a large amount of water is suddenly released that may create large flood waves capable of causing devastating impacts to downstream areas. This is even more important when the damage is caused by an earthquake, as it is unpredictable. The main objective of the research is a detailed simulating of the water surface profile from the first crack to the entire breaking of dams' body during earthquake using Finite Volume Method (FVM). The next objective is detecting of vulnerable zones on the d...
Citation Formats
Ç. Koçal, “Numerical modelling of free surface flows on round vertical slot fish passes,” Thesis (M.S.) -- Graduate School of Natural and Applied Sciences. Civil Engineering., Middle East Technical University, 2019.