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Paper Information

Journal:   JOURNAL OF WATER AND SOIL (AGRICULTURAL SCIENCES AND TECHNOLOGY)   JANUARY-FEBRUARY 2017 , Volume 30 , Number 6 ; Page(s) 1808 To 1819.
 
Paper: 

STATISTICAL ANALYSIS OF MANNING'S ROUGHNESS COEFFICIENTS IN NON-VEGETATED CANALS FOR IRRIGATION AND DRAINAGE NETWORK OF MOGHAN

 
 
Author(s):  NASSERI A.*
 
* AGRICULTURAL ENGINEERING RESEARCH DEPARTMENT, EAST AZARBAIJAN AGRICULTURAL AND NATURAL RESOURCES RESEARCH AND EDUCATION CENTER, AREEO, TABRIZ, IRAN
 
Abstract: 

Introduction: Due to sensitiveness of flow to roughness coefficient (RC), selection of this coefficient is important in earth canals designing purposes. Precision selection of this coefficient is necessary for design and operation of earthen canals purposes. Overestimation of the actual amount of this coefficient will cause an underestimation for flow velocity. Accordingly, sedimentation in the earth canals will reduce canals' capacitances. Adversely, underestimation of this coefficient will cause an overestimation for flow velocity and water flux in the earth canals. It will also increase the risk of soil erosion in the channels. This coefficient is expressed by Manning, Chezy and Darcy Weisbach equations. While, hydraulic engineers have selected Manning equation to estimate the flow rate in open channels due to ease of use and acceptable precision in the application of this equation. Water for crop production in Moghan, as one of the most important agricultural centers in Iran, is supplied from Moghan-Meel diversion dam via main canal of irrigation and drainage network with a capacity of 80 m3 s-1 with a length of 116 km. All of the branched 63-channel from the main channel are earthen. Continual sedimentation in the earth canals reduced the capacity of them and re-estimation the capacity of this canals needs to the precise quantities of variables such as roughness coefficient. Because the overestimation of the actual value of the coefficient would reduce the canals’ capacity and underestimation of the coefficient increase the risk of erosion in earth canals. The analysis of the correlation among variables, regression, analysis of statistical distribution of variables, analysis of variance of variables and the analysis of the events probabilities for stochastic variables can be made by statistical methods. Therefore, these methods were applied to analysis of roughness coefficient in the earth canals. Also, due to the importance of roughness coefficient and significant sensitivity of the capacity to this coefficient, the current study was conducted to statistically analyze and to evaluate roughness coefficients in non-vegetated canals for irrigation and drainage network of Moghan (in North-west of Iran). The results of the research may be applied in the design, evaluation and utilization of networks, especially in the irrigation and drainage network of Moghan.

 
Keyword(s): EARTH CANALS, FLOW RESISTANCE COEFFICIENT, HYDRAULIC RESISTANCE, MANNING
 
 
References: 
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Citations: 
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APA: Copy

NASSERI, A. (2017). STATISTICAL ANALYSIS OF MANNING'S ROUGHNESS COEFFICIENTS IN NON-VEGETATED CANALS FOR IRRIGATION AND DRAINAGE NETWORK OF MOGHAN. JOURNAL OF WATER AND SOIL (AGRICULTURAL SCIENCES AND TECHNOLOGY), 30(6 ), 1808-1819. https://www.sid.ir/en/journal/ViewPaper.aspx?id=572184



Vancouver: Copy

NASSERI A.. STATISTICAL ANALYSIS OF MANNING'S ROUGHNESS COEFFICIENTS IN NON-VEGETATED CANALS FOR IRRIGATION AND DRAINAGE NETWORK OF MOGHAN. JOURNAL OF WATER AND SOIL (AGRICULTURAL SCIENCES AND TECHNOLOGY). 2017 [cited 2021August04];30(6 ):1808-1819. Available from: https://www.sid.ir/en/journal/ViewPaper.aspx?id=572184



IEEE: Copy

NASSERI, A., 2017. STATISTICAL ANALYSIS OF MANNING'S ROUGHNESS COEFFICIENTS IN NON-VEGETATED CANALS FOR IRRIGATION AND DRAINAGE NETWORK OF MOGHAN. JOURNAL OF WATER AND SOIL (AGRICULTURAL SCIENCES AND TECHNOLOGY), [online] 30(6 ), pp.1808-1819. Available: https://www.sid.ir/en/journal/ViewPaper.aspx?id=572184.



 
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