Investigation of energy loss in step-spillway with obstacles on the step using physical and Flow-3D model

Q: How can I download an article?

To download an article from SID, first log in to the site, search for the article title, and click on the 'Download Article' option.

Q: How can I download an ISI article?

To download an ISI article on SID, enter the keyword or article title in the search bar, view the relevant results, click on the desired article, and select the 'Download Article' option.

Q: How can I access the SID database?

To access the SID database, visit SID.ir, create an account, and log in to access scientific resources.

Q: Is downloading articles from SID free?

Some articles on SID are available for free, while others require payment. Details are specified on the article's page.

Afshoon H.R.; Kamanbedast a.a.; MASJEDI A.R.; Heidarnejad M.; BORDBAR A.

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

Journal Paper

Paper Information

Journal: Journal of Water and Soil Conservation Year:2019 | Volume:26 | Issue:2 Page(s): 137-156

Download Full-Text

Persian Verion

View:

503

Download:

Cites:

Information Journal Paper

Title

Investigation of energy loss in step-spillway with obstacles on the step using physical and Flow-3D model

Author(s)

Keywords

Energy dissipationQ1

Flow-3DQ1

ObstaclesQ1

Physical modelQ2

Stepped spillwayQ1

Abstract

Background and Objectives: To pass the excess water and floodwaters from upstream to downstream of the dams, a structure called "spillway" is used. This structure is vital and integral as they should be ready for operation at any time. Stepped spillways are introduced as a viable option for improvement of spillways facing problem when flowing the possible maximum flow rate. Stepped spillways consist of stairs which start near the crest and continue to lower heels. Increase of roughness leads to a uniform and continuous distribution energy of the flow over the spillway. This is of great benefit for designers as is no need to create a power reduction plant such as a relaxing pool (where energy should be dispersed at once), or in the case of need the dimensions of these structures will be reduced. Materials and Methods: In this study, to increase the roughness on the Stepped spillway, barriers are used to increase the Energy dissipation. For experimental tests, a flume with a 90 degree bend was used in Islamic Azad University of Ahvaz (IAU-A). y selecting different models of barriers on the Stepped spillway in three forms with three different lengths and widths and also using barriers individually and in combination with 5 different flow rates, A total of 140 tests were conducted. After analyzing the results, it was found that the Stepped spillway combined with respectively, triangular, rectangular and trapezoidal, reduced the depreciation and energy loss. Results: Triangular barriers, on average, increase the energy consumption by 15. 9%, rectangular barriers, on the average, increase the energy consumption by 13. 7% and tipping barriers by an average 11. 2% increase in energy depreciation compared to the control model. An increase in the length and width of the barriers results in an increase in dissipation and energy loss. The two-step barriers have the highest Energy dissipation and loss. By combining barriers on the two-stair Stepped spillway, there is an average of 14. 4 percent increase in Energy dissipation. Based on the observations, rise in the Froude number from 0. 32 to 1. 71 led to a decrease in dissipation and energy losses that is due to the immersion of the stairs below the water level and the reduction of the roughness of the stairs and with the increase of the intensity of the inflow phenomenon. The simulation results with the Flow-3D math model are close to the Physical model and on average only 6. 3% of errors are acceptable. Conclusion: After analyzing the results, it was found that in the combination of Stepped spillway with triangular, rectangular and trapezoidal Obstacles, decrease in energy depreciation and energy loss are noticable. Also, comparing the simulation results and the Physical model shows that the Flow-3D mathematical model find less bias with the Physical model and closer to reality.

Cites

No record.

References

No record.

Cite

APA: Copy

Afshoon, H.R., Kamanbedast, a.a., MASJEDI, A.R., Heidarnejad, M., & BORDBAR, A.. (2019). Investigation of energy loss in step-spillway with obstacles on the step using physical and Flow-3D model. JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES), 26(2 ), 137-156. SID. https://sid.ir/paper/156212/en

Vancouver: Copy

Afshoon H.R., Kamanbedast a.a., MASJEDI A.R., Heidarnejad M., BORDBAR A.. Investigation of energy loss in step-spillway with obstacles on the step using physical and Flow-3D model. JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES)[Internet]. 2019;26(2 ):137-156. Available from: https://sid.ir/paper/156212/en

IEEE: Copy

H.R. Afshoon, a.a. Kamanbedast, A.R. MASJEDI, M. Heidarnejad, and A. BORDBAR, “Investigation of energy loss in step-spillway with obstacles on the step using physical and Flow-3D model,” JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES), vol. 26, no. 2 , pp. 137–156, 2019, [Online]. Available: https://sid.ir/paper/156212/en

Related Journal Papers