沿海滩涂淤泥质黏土水盐迁移试验分析

我国沿海滩涂土壤盐渍化程度较高,作为土壤生态环境问题之一备受关注,研究土壤水盐运动规律是改良盐渍化土壤的理论基础。以沿海滩涂淤泥质黏土为研究对象,基于土壤盐分静态迁移试验和室内一维土柱试验,对淤泥质黏土盐分迁移规律和机理进行分析。结果显示:在静置状态下,相同迁移时间内,水体体积越多,盐分迁移速度越快,盐分迁移率越高;在一维水动力弥散条件下,水力坡度越大,水动力弥散作用越显著,盐分迁移的速度越快,盐分迁移率越高。

Experimental analysis on soil water and salt migration of mucky clay in coastal shoal

The soil salinization degree of coastal shoal is high in China, which is one of soil ecological environment problems attracting much attention. The rules of soil water and salt migration are the theoretical foundation of improving the soil salinization. Based on the static soil salt migration test and indoor one-dimensional soil column test, mucky clay in coastal shoal was studied, and the migration pattern and mechanism of salt in mucky clay were analyzed. Results show that under the static state, the migration velocity and migration rate of salt are positively correlated with water volume in the same time. Under the condition of one-dimensional hydrodynamic dispersion, the migration velocity and migration rate of salt increase with the hydraulic gradient and the hydrodynamic dispersion.