【摘要】 灌区取水量和田间灌水量是首尾测算分析法测定提水灌区灌溉水利用系数的基本参数,针对水稻灌水频繁,逐次测定泵站提水量成本较高,且缺少土壤非饱和状态下准确测定田间灌水定额的有效方法的实际问题,提出了水泵净扬程修正法,对目前依据电量法估算提水量的技术进行了改进;提出了稻田非饱和土壤入渗水量的测试方法,并据此修正田间灌水量。田间测试结果表明:修正后的测试方法可使灌水量测量误差降低52%~86%;方法简单实用,易于操作,且设备要求低,适用于水稻节水灌区灌溉水利用系数的测试。更多还原

【Abstract】 The intake water quantity and the irrigation water quantity are the basic parameters to estimate the irrigation water utilization efficiency( IWUE) in lifting water irrigation districts by using the head-tail method. Due to the highfrequency irrigation of rice fields,high cost of successively water quantity measurement at pumping stations,and ineffective methods for measuring the amount of the irrigation water under the unsaturated soil conditions,this paper proposed a corrected method to improve the performance of the current electricity method in estimating the lifting water quantity. A method for measuring the amount of infiltrating water in unsaturated rice fields was also proposed to correct the amount of irrigation water in fields. Field measurements show that the measuring errors can be reduced by 52%- 86% with utilizing the corrected method. The method is simple,practical and easy to operate. The method has low request for equipments and is suitable for measuring the IWUE of water-saving irrigation for rice fields.更多还原