摘要
蒸渗测坑现有的地下自动供排水装置水量的计算是采用单次水量固定,用计数器采集电磁阀动作次数,然后计算总水量,该方法忽略了供排水柱(有机玻璃材料)内径沿高度方向的差异,以及水柱内水位波动对水位保持器的影响所带来的误差,同时自动控制的电器元件安装在地下,影响使用寿命,造成前期投入较大、维修费用较高。为了解决这一问题,对现有装置进行了改进,改进装置用高精度流量仪表直接测量进入平水箱的水量,用水力自动控制方法维持蒸渗测坑水位在一定区间波动,该装置可以完成现有装置所有功能。用模拟蒸发实验对两种装置的供水精度进行比较,实验表明,改进装置供水量的测量精度接近或优于现有装置,初步估算前期投入可节省投资20%~30%,且运行维护简单。
At present,the total water quantity in the lysimeter of underground automatic water supply and drainage device is calculated by using a single fixed water quantity and the movement times value of the electromagnetic.This method ignores the difference of the inner diameter of the water supply and drainage column(PMMA material)along the height direction and the error caused by the water level fluctuation in the water column,which affects the water level holder.At the same time,the service life of automatic control of the electrical components is reduced for its poor environment in the underground,resulting in a large initial investment and high maintenance costs.In order to solve this problem,the existing device is improved by using a high-precision flow meter to directly measure the amount of water entering the horizontal tank,and a hydraulic automatic control method is used to keep the water level of the lysimeter fluctuating in a certain range.The device can perform all the functions of the existing device.The experimental results show that the measuring accuracy of the improved device is close to or better than that of the existing device,the initial investment can be saved by 20%~30%,and the operation and maintenance are simple.
作者
黄汉生
HUANG Han-sheng(School of Water Resources and Hydropower Engineering,Wuhan University,Wuhan 430072,China)
出处
《节水灌溉》
北大核心
2022年第2期95-100,共6页
Water Saving Irrigation
关键词
蒸渗测坑试验
试验装置
供排水装置
农田灌溉试验
test of lysimeter
test apparatus
water supply and drainage device
field irrigation test
