空间尺度对灌区灌溉水利用效率影响分析

Effect of Spatial Scale on Irrigation Water Use Efficiency in Irrigation District

通过两种方法对灌区的灌溉定额及田间水利用效率进行计算,分析不同空间尺度对其计算结果的影响,并对照首位法计算结果,验证本研究计算结果的准确性。结果表明,实测法与水量平衡法对计算田间水利用效率与灌溉水利用效率的不确定度较低,计算结果较为准确。通过首位法计算的灌区灌溉水利用效率大于上述两种方法的计算结果,其原因主要在于灌区内的水会经过多次利用,而首位法在计算时考虑了这种情况的发生,所以其计算结果偏大。

In this study, two methods were used to calculate the irrigation quota and water use efficiency of irrigation area, and the effects of different spatial scales on the results were analyzed, to verify the accuracy of the results of this study. The results show that the uncertainty of the two methods is lower and the calculation results are more accurate. The irrigation water use efficiency calculated by the first-order method is larger than that calculated by the above two methods. The main reason is that the water in the irrigation area will be used many times, and the first-order method takes this situation into account in the calculation, so the calculation result is too large.