贺州市2018—2023年农田灌溉水有效利用系数年间变化分析

Analysis on annual variation of effective utilization coefficient of farmland irrigation water in Hezhou City from 2018 to 2023

农田灌溉水有效利用系数是农作物利用的净灌溉水量与水源渠首处总灌溉引水量的比值,它反映灌区渠系输水和田间用水状况,能综合反映灌区灌溉工程状况、用水管理水平、灌溉技术水平等。贺州市选择了18个样点灌区,采用“首尾测定法”计算各样点灌区灌溉水有效利用系数并推算得全市农田灌溉水有效利用系数,通过对2018—2023年贺州市灌溉水有效利用系数年间变化对比分析,发现贺州市农田灌溉水有效利用系数逐年上升,预计在未来一段时间内仍将保持平缓增长态势。

As the ratio of the net irrigation water used by crops to the total irrigation water diversion at the head of water source canal,the effective utilization coefficient of farmland irrigation water can reflect the situation of canal water diversion,farmland water use and irrigation project,the water management level and irrigation technology level.The effective utilization coefficients of irrigation water were calculated by head and tail measuring method for the 18 sample irrigation zones selected in Hezhou City,based on which the effective utilization coefficient of farmland irrigation water of the whole city was calculated.Through the comparative analysis of the annual variation of the effective utilization coefficient of irrigation water from 2018 to 2023,it is found that the effective utilization coefficient of farmland irrigation water is increasing year by year in Hezhou City,and is expected to keep a gentle growth trend in the coming period.