【摘要】 灌溉水有效利用系数是评价农田灌溉用水效率的主要指标。在冶河灌区选取四支和五支典型支渠开展田间试验,采用动水法测定渠道输水损失,利用土壤含水率差值测算田间净灌水量,最后估算灌溉水有效利用系数。试验结果表明:冶河灌区典型区灌溉水有效利用系数为0.623,而渠道输水损失占损失比重为72.7%,是影响灌溉水有效利用系数的主要因素。冶河灌区灌溉水有效利用系数测定方法对于改善河北省大型灌区灌溉节水工程措施有着重要的借鉴意义。更多还原

【Abstract】 Irrigation water utilization efficiency is an quantitative indicator to evaluate irrigation water utilization efficiency of farmland.The 4#and 5#branch canals were selected as typical cases in the Yehe irrigation district,and dynamic water method was used to measure canal conveyance water loss,and net field irrigation water was estimated by soil water content difference before and after irrigation.Finally,the irrigation water utilization efficiency was calculated.The results show that water utilization efficiency is about 0.623 in typical area of Yehe irrigation district,and the loss proportion of canal conveyance water loss is 72.7%,which is the main factor influencing the irrigation water utilization efficiency.The method of irrigation water utilization efficiency of Yehe irrigation distrct will improve irrigation watersaving projects,which has a great reference in Hebei Province.更多还原