农田排水沟水体与底泥中盐分迁移研究  

Salinity Variation in Water and the Sediments of Drainage Ditches in a Saline Agricultural Environment

作　　者：潘延鑫[1] 罗纨[1] 贾忠华[1] 李进[1] 陈远[1] 

机构地区：[1]西安理工大学西北旱区生态水利工程重点实验室,西安710048

出　　处：《水土保持学报》2012年第5期182-185,共4页Journal of Soil and Water Conservation

基　　金：国家自然科学基金项目(51079122);陕西省教育厅重点实验室科研计划项目(2010JK712)

摘　　要：基于陕西卤泊滩农田排水沟底泥盐分年内跟踪监测数据,探讨试验区排水沟底泥盐分的迁移特性和分布情况。研究结果表明:当前条件下研究区排水沟底泥盐分沿着水流汇集的方向和底泥层深度方向均有一定的累积,对流和水动力弥散是排水沟底泥盐分运动的主要机制;沟底泥盐分含量与水体水量呈负相关关系,而与水体盐分含量呈良好的正相关关系,且相关系数达到0.93;水体水量的变化是引起其本身和底泥盐分含量变化的主要因素。Based on salinity monitoring of water and sediments in drainage ditches in the Lubotan reclamation area of Shaanxi,China,the pattern and distribution of salinity in drainage ditches were studied in this paper.The results showed that salts were partially stored in the underlying sediments,but mostly transported to the downstream along the ditches.The salinity variation was mainly caused by the advection and hydrodynamic dispersion from the freshwater entering the ditch system in the end of irrigation events.The observed salinity of the ditch sediment was negatively correlated to the volume of water in the ditch,while the salinity of water body was positively correlated to the water volume（r=0.93）.The change in water volume in drainage ditches was the major driving force for salinity variation in the ditch system.

关 键 词：排水沟 底泥 电导率 盐分迁移 

分 类 号：S267.71[农业科学—农业水土工程]