基于Gardner模型的黔西南土壤水分特征分析

【目的】了解黔西南州不同地区土壤剖面(0~60 cm)持水特性的差异。【方法】在实验室内利用压力膜仪法测定了各土壤的水分特征曲线,并分析其土壤水分特征。【结果】黔西南州各植烟县不同土层土壤水分特征曲线匀可采用Gardner模型拟合,不同烟区土壤水分常数及持水特性有明显差异。其中兴义、贞丰、安龙和普安土壤持水性能强弱表现为40~60 cm>20~40 cm>0~20 cm,晴隆和兴仁烟区土壤持水性能表现为20~40 cm>40~60 cm>0~20 cm;各植烟县烟田0~20 cm土层土壤持水性强弱顺序为兴义,安龙,晴隆,贞丰,普安和兴仁;20~40 cm土层土壤的持水性强弱顺序为兴义,安龙,晴隆,兴仁,贞丰和普安;40~60 cm土层土壤的持水性强弱顺序为兴义、安龙、普安、晴隆、贞丰和兴仁。【结论】同一植烟县深层土壤持水能力强于表层土壤,不同植烟县间的土壤持水性也存在明显差异。

Structural Damage Assessment by an Embedded Fiberoptic Sensor Array and Its ANN Signal Processor

A novel type of two-dimensional damage assessment system for real time monitoring the structural health of composite structure is described. The configuration of the embedded fiberoptic sensor array and the model of the artificial neural network (ANN) are discussed. The experimental system and results show that the system can monitor a damage of structures with potential application in areas such as space aeronautics, civil engineering, etc.