| Cite this article: | 郭佳雯,蒲迅赤,黄瑞仙.渠道走向及几何尺寸对灌溉水增温的影响研究[J].灌溉排水学报,2021,(1):-. |
| guojiawen,puxunchi,huangruixian.渠道走向及几何尺寸对灌溉水增温的影响研究[J].灌溉排水学报,2021,(1):-. |
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| DOI： |
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| Study on the Influence of Channel Orientation and Geometrical Size on Irrigation Water Temperature Increase |
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guojiawen, puxunchi, huangruixian
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State Key Lab. of Hydraulics and Mountain River Eng.
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| Abstract: |
| The growth and development of crops need a certain temperature, but both the well irrigation method in the north of China and the reservoir water storage irrigation in the South will cause low irrigation water temperature. If the water temperature is too low in the process of irrigation, it will reduce the photosynthesis of plants, inhibit the water absorption of roots, and affect the absorption of minerals, thus breaking the development law of crops, and ultimately leading to the reduction of grain production. Therefore, it is necessary to take certain measures to increase the irrigation water temperature. 【Objective】The objective is to explore the influence of the direction and size of the channel itself on the irrigation water temperature, from the perspective of the optimization of the direction and size of the channel to improve the heating efficiency of the irrigation water. 【Method】Some experiment were conducted. We established a calculation model of water surface temperature, and verified the accuracy of the model through experiments On this basis, We used this model to calculate the increasing temperature range of irrigation channel water under nine conditions. The nine conditions are as follows: the width depth ratio of the river channel in the north-south direction is 2:1, 1.5:1 and 1:1, the width depth ratio of the river channel in the east-west direction is 2:1, 1.5:1 and 1:1, and the width depth ratio of the river channel at an angle of 45 ° between the east-west direction and the east-west direction is 2:1, 1.5:1 and 1:1. 【Result】The experiment shows that the model has a certain precision and accuracy. The simulation results show that under the same conditions, the channel with largest ratio of width to depth in east-west direction had the highest heating efficiency. When the channel trend is the same, the width depth ratio is different, the channel with a width-depth ratio of 2:1 had a heating efficiency of 42.4%～526%, which was higher than that with a ratio of 1:1. And when the width depth ratio of channels is the same, the trend is different, the channel with east-west direction had a heating efficiency of 58.45%～296%, which was also higher than that with north-south direction. 【Conclusion】Therefore, we can draw the following conclusions: (1) the mathematical model of irrigation water temperature increase established in this paper has a certain precision and accuracy, and can be used in the calculation of the actual process; (2) under the same conditions, the greater the width depth ratio, the better the channel temperature increase efficiency. Therefore, in the possible case, the channel width depth ratio should be maximized to increase the natural temperature increase efficiency of irrigation water; (3) In the case of the same section area, width depth ratio and time interval, the closer the channel is to the East-West trend, the better the effect of increasing temperature is. Therefore, if possible, the channel should be close to the east-west direction to increase the natural warming efficiency of irrigation water. |
| Key words: Channel direction; Geometric size; Irrigation water; Solar radiation; Water temperature |
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