摘要
渤海湾西岸滨海盐渍土的盐渍化特征与滨海平原的地面高程、气候条件、盐渍土的理化性状、地下水的矿化度及人类活动等密切相关。就土盐渍化的程度而言,地面高程较高处的土高于地面高程较低处的土,上层土高于下层土。受蒸发和降水影响,地下水位以上土的盐渍化敏感深度为1 m左右。随着气候的变化,滨海盐渍土显现出春季蒸发,上层土积盐;夏季淋洗,土中盐分向下移动的盐渍化特征。随着深度的增加,土的含盐量逐渐减少,至地下水位附近出现轻微增长。从剖面上地表至地下水位间可划分为3个不同聚盐形态和含盐量的土盐渍化程度分区带,即土蒸发浓缩聚盐带、土盐化变动带和土饱水溶盐带;平面上向海岸线方向延伸,土逐渐由非盐渍土变为弱盐渍土、中盐渍土和强盐渍土,含盐量和盐渍化程度也越来越高。地下水位浅和地下水矿化度高,则上层土的盐渍化程度就愈高。
Characteristics of salinization of saline soil in west coast area of Bohai gulf are closely related to ground elevation of plain, climate conditions, physical and hydrological properties of soil, mineralization of groundwater, and people＇s actions. So far as degree of salinization, it has been investigated that salt content of soil in higher elevation position is more than that in lower elevation position; salt content of soft in upper level point is more than that in lower level point; and the effective depth of salinization of soil above groundwater table is about one meter because of evaporation and rainfall. In pace with weather change, saline soil in inshore area shows some characteristics, such as salt accumulation in top soil in spring because of evaporation; and salt moving down in summer because of rainfall. With an increase of depth, salt content of soil decreases slowly in vertical direction, but salt content raise slightly near groundwater table; and the grade of salinization of soil is classified into three kinds of sections of salt content from ground surface to groundwater table; i.e. evaporation and salt accumulation section, changeable salt content section, and salt solution section. In horizontal direction, i.e. toward the coastal line of Bohai gulf, the soil changes gradually from slight salinization to high salinization via moderate salinization, and salt content and degree of salinization of soil is more and more obvious. Degree of salinization of top soil is serious at the condition of a sallow groundwater table and more mineralization of groundwater.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2008年第5期1217-1221,1226,共6页
Rock and Soil Mechanics
基金
国家自然科学基金(No.40772166)
天津市自然科学基金(No.05YFSYSF00300、No.07JCYBJC12900)
天津市建委科技项目(No.2007-43)
关键词
滨海盐渍土
渤海湾西岸
土盐渍化
土的含盐量
地下水矿化度
saline soil in inshore
west coast area of Bohai gulf
salinization
salt content of soil
mineralization of groundwater
