摘要
节水灌溉是沈阳水利多年持续研究的课题。节水新概念,是减少无效的蒸腾与蒸发量。而有效降水量,是一项计算ET值,综合腾发量的重要参数。本文对有效降水量的概念进行了阐述,从降水特性,土壤特性,作物腾发及灌溉管理四个方面分析了有效降水量的影响因素。此外,还介绍了在不同情况下对有效降水量应选用的不同的估算方法。在沈阳市节水灌溉项目中,选用一般估算方法和经验估算方法两种适宜的有效降水量估算方法,对其进行了正确估算。
Water-saving irrigation is a durative research project for Ministry of Water Resources of Shenyang. A new concept of water saving is reduction of useless evaporation and evapotranspiration. But effective precipitation is a important parameter by calculating ET value and synthesizing evapotranspiration. In this paper, we make an illustration of effective precipitation, and analyze the influential factors from the characters of precipitation, soil properties, crop evapotranspiration and irrigation management. Furthermore, we should utilize different estimation methods in different situations. In Shenyang＂ s water-savingirrigation program, a general estimation method and experimental estimation method are chosen for the accurate estimation of effective precipitation.
出处
《气象水文海洋仪器》
2009年第1期96-100,共5页
Meteorological,Hydrological and Marine Instruments
关键词
节水灌溉
有效降水量
估算
特性
water-saving irrigation
effective precipitation
estimation
characters
