蒸渗仪生命周期分析

Life Cycle Analysis of Lysimeter

潜水蒸发观测数据的准确性和连续性是衡量蒸渗仪性能的主要指标,是保证潜水蒸发研究成果准确性的基础。以新疆昌吉地下水均衡试验场1992~2015年潜水蒸发观测数据的月缺测率和月异常率为指标,对蒸渗仪生命周期进行划分。结果表明,蒸渗仪的生命周期可划分为形成期(1992~1998年)、成长-成熟期(1999~2010年)、衰退期(2011~2015年)。蒸渗仪测筒内土体由自然释水、密实阶段逐渐呈现稳定状态,观测资料连续性和完整性逐渐变好,后期仪器出现明显老化现象,观测资料连续性较差。设备因素、人为影响和外部环境均是导致蒸渗仪缺测和异常情况的原因。

The accuracy and continuity of the observed data of phreatic water evaporation is the main index to measure the perfor-mance of the lysimeter,and the basis to ensure the accuracy of phreatic water evaporation research results.The life cycle of lysimeter was divided according to the monthly missing rate and monthly abnormal rate of phreatic water evaporation observation data from 1992 to 2015 in changji groundwater balance test station,Xinjiang.The results show that the life cycle of lysimeter could be divided into formation period(1992-1998),growth-maturity period(1999-2010)and decline period(2011-2015).The soil in the measuring cylinder of lysimeter gradually presents stable state from the natural water release and compaction stage,and the instrument appears obvious aging phenomenon in the later stage;the continuity and integrity of observation data gradually becomes better,and the continuity in the later period is poor.Equipment factors,human influence and external environment are the reasons for the missing and abnormal conditions of the lysimeter.