北大港水库底泥盐分释放规律研究  

Study on the Release of Salt From Sediments of Beidagang Reservoir

作　　者：胡鹏[1] 刘春光[1] 孙红文[1] 常素云[2] 张凯[2] 

机构地区：[1]南开大学环境污染过程与基准教育部重点实验室,天津300071 [2]天津市水利科学研究院,天津300061

出　　处：《环境科学与技术》2013年第S1期69-73,共5页Environmental Science & Technology

基　　金：国家科技支撑计划项目(2012BAC07B02);水利部公益性行业科研专项经费项目(201101060)

摘　　要：底泥的盐分释放是滨海地区淡水库水质咸化的主要原因之一,而包括上覆水条件在内的多种因素可能影响到底泥的盐分释放。为了研究底泥盐分释放的规律和主要影响因素,采集了天津滨海地区典型淡水库——北大港水库底泥样品,测定了盐分含量,并通过室内模拟实验,研究了底泥盐分含量、上覆水水深、上覆水盐浓度以及扰动对底泥盐分释放的影响。调查结果表明,库区底泥全盐量为0.095%~0.818%,总体属轻盐化土和中盐化土,库心底泥盐分含量明显高于库周底泥。室内模拟实验表明,底泥含盐量越高,盐分释放通量越大;实验条件下上覆水越深,上覆水盐分含量越低,底泥盐分释放通量越大;上覆水扰动会促进底泥盐分释放。该研究认为,底泥盐分释放受底泥盐分含量和上覆水理化因素的多重影响,对其释放规律的研究有助于更好地解释滨海地区水体的咸化机制。Salt release from sediments is one of the main reasons for the salinization of coastal freshwater reservoirs.Various factors including conditions of overlying water may influence the release of salt from sediments.To investigate the salt release characteristics of sediments and related influential factors,sediment samples were collected from a coastal reservoir Beidagang Reservoir.The salt content in sediment samples were measured,and laboratory simulating experiments were conducted to check the possible influence of different factors,including the salt content of sediments,the depth of overlying water,the salt concentration of overlying water,and the disturbance of overlying water.The results show that the total salt concentrations range from 0.095% to 0.818%,indicating that the sediments can be defined as slightly or moderately saline soils.Salt concentrations of the sediments from the center of the reservoir are higher than those from outer sites.The results of indoor experiments show that sediment salt release fluxes are greater under the following conditions: the higher sediment salt content,the deeper overlying water,the lower overlying water salt concentration,and the disturbance of overlying water.This study demonstrates that salt release from sediments can be influenced by many factors,and understanding the influential factors will help explicate the mechanisms of water salinization of coastal reservoirs.

关 键 词：北大港水库 底泥 盐分释放 水质咸化 盐度 

分 类 号：X832[环境科学与工程—环境工程]