河北石津灌区水循环组份特征及用水水平分析

Analysis of water cycle components characteristics and water use level of Shijing Irrigation Scheme in Hebei province

选择河北省石津灌区作为研究区，利用收集的灌区资料分析灌区2004～2006年水循环组份特征，发现灌区水资源组成结构中灌溉和降雨所占比例为42％，潜水补给所占比例为16．5％，灌域降水量、潜水位和作物腾发量年内变化皆表现出了一定的规律性．选择渠系水利用系数、灌溉效率以及3个水分生产率指标计算了2004～2007年冬小麦生育期内灌区用水水平，结果表明渠系水利用系数和灌溉水利用系数2004～2007年平均值分别为0．51和0．4，而考虑了水资源在时间上的重复利用后，得到灌溉效率为0．66，通过计算灌域不同尺度水分生产率，发现该指标随着尺度的增大而减小，说明水平回归水很少．

Some second-hand data such as irrigation water amount, crop yield, groundwater level and so on in 2004-2006 are collected to analyze the characteristics of water cycle components in Wangjiajing Irrigation Scheme （WJJ）. The results indicate that the proportion of irrigation water and precipitation to the whole of water resources are both 42%, and that of subsurface contribution to water soil reservoir from capillary rise is 16.5%. Precipitation, groundwater level and crop actuarial ET show some variation regularities. The average value of the canal delivery performance ratio is 0.51 and that of irrigation performance ratio is 0.4 ; while irrigation efficiency（IE） obtains a higher value of 0.66 ; because the scenario that the seepage to groundwater in irrigation season can be reuse by capillary rise is taken into account by this index. Irrigation water productivity （WP1）, gross inflow productivity （WPg） and depletion water productivity （WPD） get lower with the scale increase because the influence of spatial scale effect is not so notable.