| Effects of furrow microtopography and variability of section shape on irrigation quality and sensitivity analysis |
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| DOI：10.7606/j.issn.1000-7601.2016.06.18 |
| Key Words: furrow irrigation microtopography of furrow bottom furrow section shape variability irrigation uniformity irrigation efficiency sensitivity coefficient |
| Author Name | Affiliation | | NI Dong-ning | Water Conservancy and Civil Engineering College, Inner Mongolia Agricultural University, Hohhot Inner Mongolia 010018, China | | LI Rui-ping | Water Conservancy and Civil Engineering College, Inner Mongolia Agricultural University, Hohhot Inner Mongolia 010018, China | | SHI Hai-bin | Water Conservancy and Civil Engineering College, Inner Mongolia Agricultural University, Hohhot Inner Mongolia 010018, China | | MIAO Qing-feng | Water Conservancy and Civil Engineering College, Inner Mongolia Agricultural University, Hohhot Inner Mongolia 010018, China | | BIAN Li-jun | Sandy Area Irrigation Experiment Station,Ulanbuh Irrigation Field Administration, Bayannur, Inner Mongolia 015200, China | | LI Mao-hua | Water Authority of Bayannur Deng Kou, Bayannur, Inner Mongolia 015200, China |
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| Abstract: |
| In order to research the affect of spatial and temporal variability of furrow in water interface on irrigation quality, this paper made a statistical analysis to the measured data based on field experiments about variation of microtopography and section shape of furrow before and after irrigation. The results showed that: Over time, influence of irrigation and other factors, the Sd value that characterized furrow microtopography presented a decreasing trend and average reduced from 3.45 to 1.17, and the variability decreasing. The coefficient of variation was reduced from 0.17 to 0.09, the microtopography was tended to flat gradually. The standard deviation of P1 values that reflected the variation of the section shape showed an increasing trend, the standard deviation increased from 1.68 to 1.95, and the coefficient of variation increased from 0.47 to 0.53, but belonged to the weak variability. With the increase of the relative elevation of furrow bottom and the standard deviation of the section shape parameter, the irrigation quality indexes total showed a decreasing trend. Through the sensitivity analysis, the influence of two factors on irrigation uniformity was more than the irrigation efficiency, the average sensitivity coefficients were higher than 9.46% and 11.84%, and the effect of variation of microtopography was larger than section shape. |
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