摘要
在陕西杨凌的冬小麦地及果树地进行了畦田规格和灌水技术要素对水流推进和消退过程、灌水效率及灌水均匀系数影响的田间试验,结果表明,文中给出的地面灌溉模型可较好地模拟畦田水流运动。根据灌水前、后土壤体积含水量计算了入渗水深均匀系数,结果表明,入渗水深均匀系数随畦宽的变化趋势与灌水效率相同,但可以达到0.75以上。对地面灌溉来说,高均匀系数并不一定意味着高灌水效率(田间水利用系数)。
Field experiments were conducted in the winter wheat and fruit trees farmlands of Yangling City, Shanxi Province, to investigate the impacts of the sizes of the borders and irrigation technique parameters on the water flow advance and recession, irrigation application efficiency and distribution uniformity (DU). The results showed that the surface irrigation model could simulate the border irrigation water flow movement effectively. The distribution uniformity is calculated according to the changes in soil moisture content. It was found that the DU varies with the border width in a similar tendency with application efficiency, and a high DU of greater than 0.75 is possible in most of the borders. The results suggested that a high DU value does not necessarily mean high application efficiency for surface irrigation.
出处
《中国农村水利水电》
北大核心
2005年第6期4-7,共4页
China Rural Water and Hydropower
基金
国家"十五"重大科技专项"现代节水农业技术与新产品"课题(20022AA2Z4211)。
关键词
地面灌溉
水流特性
数学模拟
灌水效率
灌水均匀度
surface irrigation
water flow performance
mathematic simulation
application efficiency
irrigation distribution uniformity
