Sensitivity of the SHARC Model to Variations of Manning Coefficient and Effect of “n“ on the Sediment Materials Entry into the Eastern Water intake- A Case in the Dez Diversion Weir in Iran
Permanent rivers are the main sources of renewable
water supply for the croplands under the irrigation and drainage
schemes. They are also the major source of sediment loads transport
into the storage reservoirs of the hydro-electrical dams, diversion
weirs and regulating dams. Sedimentation process results from soil
erosion which is related to poor watershed management and human
intervention ion in the hydraulic regime of the rivers. These could
change the hydraulic behavior and as such, leads to riverbed and river
bank scouring, the consequences of which would be sediment load
transport into the dams and therefore reducing the flow discharge in
water intakes. The present paper investigate sedimentation process
by varying the Manning coefficient "n" by using the SHARC
software along the watercourse in the Dez River. Results indicated
that the optimum "n" within that river range is 0.0315 at which
quantity minimum sediment loads are transported into the Eastern
intake. Comparison of the model results with those obtained by those
from the SSIIM software within the same river reach showed a very
close proximity between them. This suggests a relative accuracy with
which the model can simulate the hydraulic flow characteristics and
therefore its suitability as a powerful analytical tool for project
feasibility studies and project implementation.
[1] Hedayat,N. [2005]. Improving The Performance Of Water Delivery In
The Dez & Moghan Irrigation Schemes In Iran, PhD Thesis , Cranfield
University , UK(2005).
[2] Operation and Maintenance of the North Khuzestan Irrigation and
Drainage Company (2009). KWAPA, Dezful, Iran.
[3] Department for International Development [2001]. "Sediment and
Hydraulic Analysis for Rehabilitation of Canals, "Software Manual, H.R
Wallingford, UK.
[4] Abshoori,A[2006]. Investigating the sedimentaatio process in settling
basin in irrigation netwrok of the Imam Khomeini agro-complex, MSc
Dissertation, Chamran University, Iran.
[5] Chadwick ,A[2008]. Hudraulics in civil environmental engineering ,3rd
translated by Mashal, M, Tehran University Press
[6] Shafaaee Bejestan,M[1994]. Sedimntation Hydraulics, first Edition,
University Of Chamran, Iran
[7] Najafi,L[2005]. Investigating the challenges of the water intake in
Diversion weirs and means of overcoming them-Case study in Dez
Diversion Dam In Dezful, Iran. MSc Dissertation, Khajeh Nasiradin
University, Tehran, Iran.Toosi.
[8] Ashkaria, S, Kiamanesh, H, and Hedayat, N[2010]. Simulation of the
flow pattern using Flow 3D software- a case study in the Dez diversion
Weir in Dezful, Iran. Proceedings: National Conference in water, soil,
palnt and mechanisation , Islamic Azad University, Dezful, Iran.
[9] Shirin,H, Hedayat, N, and kiamanesh ,[2010]. Analytical investigation
of the sedimientaion process and their underlying cause- a case study in
the Dez Diversion Weir in Dezful, Iran. Proceedings: National
Conference in water, soil, palnt and mechanisation , Islamic Azad
University, Dezful, Iran.
[10] Mansoujian, M.R[2008]. Crtiical iinvestigation of the sedimentation
processes in the water intakes using the SHARC software- A case study
of the Eastern Intake structure in Dezful. MSc dissertation, I.azad
University, Dezful, Iran.
[11] Najmaee, M[1994]. Applied hydraulics, 1st edition, Elmosanat
University Press, Tehran, Iran.
[12] Shirin, H[2009]. Investigating the sedimientaion process and their
underlying cause- A case study in the Dez Diversion Weir in Dezful,
Iran. M.Sc dessertation, Islamic Azad University, Dezful, Iran.
[13] Ahwazin, H[2007]. Numerical model of dez diversion Dam in Dezful,
Iran. M.Sc dessertation, Islamic Azad University, Dezful, Iran.
[1] Hedayat,N. [2005]. Improving The Performance Of Water Delivery In
The Dez & Moghan Irrigation Schemes In Iran, PhD Thesis , Cranfield
University , UK(2005).
[2] Operation and Maintenance of the North Khuzestan Irrigation and
Drainage Company (2009). KWAPA, Dezful, Iran.
[3] Department for International Development [2001]. "Sediment and
Hydraulic Analysis for Rehabilitation of Canals, "Software Manual, H.R
Wallingford, UK.
[4] Abshoori,A[2006]. Investigating the sedimentaatio process in settling
basin in irrigation netwrok of the Imam Khomeini agro-complex, MSc
Dissertation, Chamran University, Iran.
[5] Chadwick ,A[2008]. Hudraulics in civil environmental engineering ,3rd
translated by Mashal, M, Tehran University Press
[6] Shafaaee Bejestan,M[1994]. Sedimntation Hydraulics, first Edition,
University Of Chamran, Iran
[7] Najafi,L[2005]. Investigating the challenges of the water intake in
Diversion weirs and means of overcoming them-Case study in Dez
Diversion Dam In Dezful, Iran. MSc Dissertation, Khajeh Nasiradin
University, Tehran, Iran.Toosi.
[8] Ashkaria, S, Kiamanesh, H, and Hedayat, N[2010]. Simulation of the
flow pattern using Flow 3D software- a case study in the Dez diversion
Weir in Dezful, Iran. Proceedings: National Conference in water, soil,
palnt and mechanisation , Islamic Azad University, Dezful, Iran.
[9] Shirin,H, Hedayat, N, and kiamanesh ,[2010]. Analytical investigation
of the sedimientaion process and their underlying cause- a case study in
the Dez Diversion Weir in Dezful, Iran. Proceedings: National
Conference in water, soil, palnt and mechanisation , Islamic Azad
University, Dezful, Iran.
[10] Mansoujian, M.R[2008]. Crtiical iinvestigation of the sedimentation
processes in the water intakes using the SHARC software- A case study
of the Eastern Intake structure in Dezful. MSc dissertation, I.azad
University, Dezful, Iran.
[11] Najmaee, M[1994]. Applied hydraulics, 1st edition, Elmosanat
University Press, Tehran, Iran.
[12] Shirin, H[2009]. Investigating the sedimientaion process and their
underlying cause- A case study in the Dez Diversion Weir in Dezful,
Iran. M.Sc dessertation, Islamic Azad University, Dezful, Iran.
[13] Ahwazin, H[2007]. Numerical model of dez diversion Dam in Dezful,
Iran. M.Sc dessertation, Islamic Azad University, Dezful, Iran.
@article{"International Journal of Earth, Energy and Environmental Sciences:54104", author = "M.R.Mansoujian and A.Rohani and N.Hedayat and M.Qamari and M. Osroosh", title = "Sensitivity of the SHARC Model to Variations of Manning Coefficient and Effect of “n“ on the Sediment Materials Entry into the Eastern Water intake- A Case in the Dez Diversion Weir in Iran", abstract = "Permanent rivers are the main sources of renewable
water supply for the croplands under the irrigation and drainage
schemes. They are also the major source of sediment loads transport
into the storage reservoirs of the hydro-electrical dams, diversion
weirs and regulating dams. Sedimentation process results from soil
erosion which is related to poor watershed management and human
intervention ion in the hydraulic regime of the rivers. These could
change the hydraulic behavior and as such, leads to riverbed and river
bank scouring, the consequences of which would be sediment load
transport into the dams and therefore reducing the flow discharge in
water intakes. The present paper investigate sedimentation process
by varying the Manning coefficient "n" by using the SHARC
software along the watercourse in the Dez River. Results indicated
that the optimum "n" within that river range is 0.0315 at which
quantity minimum sediment loads are transported into the Eastern
intake. Comparison of the model results with those obtained by those
from the SSIIM software within the same river reach showed a very
close proximity between them. This suggests a relative accuracy with
which the model can simulate the hydraulic flow characteristics and
therefore its suitability as a powerful analytical tool for project
feasibility studies and project implementation.", keywords = "Sediment transport, Manning coefficient, Eastern Intake, SHARC, Dez River.", volume = "4", number = "8", pages = "344-6", }