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Iranian Water Researches Journal
Effective Geometrical parameters on discharge coefficient of gated piano key weir


 submission: 22/10/2019 | acception: 03/01/2020 | publication: 01/10/2020

DOI 

Authors
Masood Akbari1*, Farzin Salmasi2, Hadi Arvanaghi3, Masoud Karbasi4, Davood Farsadizadeh5

1-University of Tabriz،masood.akbari@gmail.com

2-Associated professor of Department of Water Engineering, University of Tabriz،salmasi@tabrizu.ac.ir

3-Associated professor of Department of Water Engineering, University of Tabriz،arvanaghi@tabrizu.ac.ir

4-Associated professor of Department of Water Engineering, University of Zanjan،m.karbasi@znu.ac.ir

5-Professor of Department of Water Engineering, University of Tabriz،farsadi@tabrizu.ac.ir



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Abstract

Rainfed cultivation is one of the best ways to rich the sustainable development with optimal use of green water. About 75 percent of the world's cultivated areas are rainfed, which forms important part of the international economy. For a long time rainfed cultivation has been a common method in low-rainfall areas of Iran and mentioned method is one of the main ways of producing crops yet. Rainfall is an important factor in rainfed agriculture, so its limitations and non-conformity with planting season can reduce the production efficiency. Wheat growing period consists of three seasons of the year. Rainfall in spring, fall and winter is effective on wheat growth. Cereal grains, especially wheat, are the most important food source in the world. After cereals, legumes are considered to be the main human food source and have significant nutritional and agricultural importance. In addition to being high in quality and valuable, suitable and complementary protein for cereals in the nutritional pattern, lentils are also among the legumes that stabilize the air nitrogen in the soil, which lends itself to crop rotation. Thus, intermittent cultivation of rainfed wheat with rainfed lentil is an important factor in stabilizing production in the developing countries. Given that Iran is in arid and semi-arid regions and its population is growing, it is important to plan, and evaluate the past in order to predict the future. Zanjan province is the fifth country with 6.9% of total grains production. In this study, the effect of precipitation in water requirement of these two important products and their water stress has been studied in the climatic conditions of Zanjan plain. Zanjan province is located at the longitude of 47º 10' to 50 º 5' East and the latitude of 35º 25'37º10' North. The area of Zanjan province is about 39369 square kilometers. According to the De Marten climate classification, the tropical, temperate and subtropical climatic zones can be identified at the applied level. Average rainfall over the past decade has been reported as 301 mm. For conducting this study, statistical data including meteorological and crop yield data 2004-2014 obtained from the Meteorological and Agriculture-Jahad Organization, respectively. Zanjan synoptic station with the latitude and longitude of 48º 31' East and 36º 39' North, respectively, is located 1663 meters above the sea level. In the last 50 year, the annual precipitation trend has been decreasing and this trend is affecting the water availability of rainfed plants in the region and can decrease yield of crops. Although in the long term the average temperature trend is slightly constant, the yield has also declined with decreasing rainfall. Regarding the importance of wheat and lentil in arid lands of Zanjan plain, these two main rainfed crops were investigated in this study by determining the regression relationship between yield and evapotranspiration with precipitation and water stress coefficient. The results showed that the average evapotranspiration values of wheat and lentil for Zanjan plain during the study period were 398 and 262 mm and the mean temporal stress coefficients were 36 and 33%, respectively. Regression analysis showed the highest correlation between actual evapotranspiration and yield. The highest correlation was observed between temporal stress coefficient and yield of rainfed wheat. But, in lentils this trend was different and the correlation between water stress coefficient (Ks) and yield was more than the precipitation and lentil yield. For 25% decrease in precipitation, wheat yield reduced almost 18%. Generalizing this issue, the response to water stress coefficient of the product or Ky become 1.14. The regression equation also indicated that in case of being precipitation about 300 mm, wheat yield in the area will be near one tone. For 25% decrease in precipitation, wheat yield reduced about 22%. According to figures, the fitted model was significant and well-acted; and during the growth period of these crops, lack of water supply caused water stress as well as severe yield loss. The occurrence of high tension time percentage of 25% for wheat and 20% for lentil in all years of the study period confirms that the climatic potential of the region does not reach the standard requirements of plants, so it is not possible to achieve optimal performance. Hence, new methods of tillage, conservation agriculture and supplemental irrigation are recommended for achieving high yield, as well as the expected cultivation method for crops.




Keywords

Gated Piano Key (GPK) weir  Discharge coefficient (Cd)  Multiple linear regression  Multiple nonlinear regression  Experimental model. 



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Citation
اکبری م. سلماسی ف. ارونقی ه. کرباسی م. و فرسادی‌زاده د. 1399. پارامترهای هندسی مؤثر بر ضریب دبی سرریز کلید پیانویی دریچه‌دار. مجله پژوهش آب ایران. 38: 115-121




References

Akbari M. Salmasi F. Arvanaghi H. Karbasi M. and Farsadizadeh D. 2019. Application of Gaussian Process Regression Model to Predict Discharge Coefficient of Gated Piano Key Weir, Water Resources Management. 33(11): 3929-3947

Anderson R. M. and Tullis B. P. 2012. Comparison of Piano Key and Rectangular Labyrinth Weir Hydraulics. Journal of Hydraulic Engineering. 138(4): 358-361

Bilhan O. Emiroglu M. E. and Kisi O. 2011. Use of artificial neural networks for prediction of discharge coefficient of triangular labyrinth side weir in curved channels. Advances in Engineering Software. 42(4): 208-214

Emiroglu M. E. and Kisi O. 2013. Prediction of Discharge Coefficient for Trapezoidal Labyrinth Side Weir Using a Neuro-Fuzzy Approach. Water Resources Management. 27(5): 1473-1488

Emiroglu M. E. Bilhan O. and Kisi O. 2011. Neural networks for estimation of discharge capacity of triangular labyrinth side-weir located on a straight channel. Expert Systems with Applications. 38(1): 867-874

Henderson F. M. 1966. Open channel flow. 1-522

Hien T. C. Son H. T. and Khanh M. 2006. Results of some piano keys weir hydraulic model tests in Vietnam. Paper presented at the Proc. 22nd ICOLD Congress, Barcelona. Q87(R39): 581-596

Kabiri-Samani A. and Javaheri A. 2012. Discharge coefficients for free and submerged flow over Piano Key weirs. Journal of hydraulic research. 50(1): 114-120

Laugier F. 2007. Design and construction of the first Piano Key Weir spillway at Goulours dam. International journal on hydropower and dams. 14(5): 94

Laugier F. Lochu A. Gille C. Leite Ribeiro M. and Boillat J. L. 2009. Design and construction of a labyrinth PKW spillway at Saint-Marc dam, France. Hydropower & Dams. 16(LCH-ARTICLE-2009-023): 100-107

Lempérière F. 2011. New labyrinth weirs triple the spillways discharge. Water and Eenrgy International. 68(11): 77-78

Lempérière F. and Jun G. 2005. Low Cost Increase of Dams Storage and Flood Mitigation: The Piano Keys Weir, Q. 53 R. 2.06 International Commission on Irrigation and Drainage. Paper presented at the Nineteenth Congress Beijing. 1-19

Lempérière F. and Ouamane A. 2003. The Piano Keys weir: a new cost-effective solution for spillways. International Journal on Hydropower & Dams. 10(5): 144-149

Machiels O. Erpicum S. Archambeau P. Dewals B. and Pirotton M. 2013. Parapet Wall Effect on Piano Key Weir Efficiency. Journal of Irrigation and Drainage Engineering. 139(6): 506-511






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