均匀坡度下考虑三偏差的滴灌系统流量偏差率的计算
Calculation of flow deviation rate of drip irrigation system taking three deviation rates into account on uniform slopes
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摘要: 为了精确地模拟滴灌系统流量偏差率，使滴灌系统的设计既经济又可靠，该文以考虑地形坡度及水力偏差的流量偏差率的计算方法为基础，根据不利组合原则与概率论知识，深入分析了制造偏差对滴灌系统流量偏差率的影响，并通过进一步水力计算和数学推理，建立了均匀坡度下滴灌系统流量偏差率与制造偏差率、水力偏差率及地形偏差率三者之间的函数关系，推导出考虑三偏差的流量偏差率计算公式。该公式不但可以用来模拟不同保证率下的滴灌系统流量偏差率，而且简便实用，可直接应用于滴灌工程设计中。Abstract: Based on the method for calculating flow deviation of drip irrigation system taking hydraulic deviation and terrain slope into account, according to the disadvantage combination principle and the probability theory, the effect of manufacturing deviation on flow deviation rate was analyzed to imitate flow deviation of drip irrigation system accurately for designing drip irrigation system economically and credibly. The relationships between flow deviation rate and manufacturing deviation rate, hydraulic deviation rate and terrain deviation rate in drip irrigation system were established on uniform slopes by hydraulic calculation and mathematic consequence. Taking the three deviation rates into account, a formula for computing the flow deviation rate was deduced. The formula can simulate flow deviation rate at different guarantee rates for a drip irrigation system, which is simple and practical. It can be used in the design of drip irrigation project.
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Keywords:
- irrigation /
- flow rate /
- mathematical models /
- uniform slope /
- drip irrigation system /
- deviation rate
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