天津滨海地区拟建水库底泥盐渍化程度分析

Analysis of Sediment Salinization Degree of the Proposed Reservoir in the Coastal Area of Tianjin

在天津滨海某拟建水库库区及库周采集土样，对水库底泥盐渍化程度进行了全面分析。结果表明：拟建库区底泥全部属于滨海盐土，全盐量均值为1．22％，Cl^-均值为0．61％，pH值均值为8．44，盐渍化程度较重；拟建库周底泥大部分属于滨海盐土，极少部分为重盐化土和中盐化土，全盐量均值为1．37％，Cl^-均值为0．55％。拟建库区水平方向上金钟河以北含盐量较高，金钟河以南含盐量较低。垂直方向上，表层到1m深度范围内盐分含量随深度增加而减小；1—4m深度范围内，土壤盐分含量最低，且变化不大；深度超过4m时，土壤盐分含量随深度增加而增大。根据拟建水库底泥盐渍化程度较重的特点，提出了相应的水库运行建议。

Through systematic sampling from a proposed reservoir, this paper analyzed the salinization degree of the reservoir sediment. The results show that all of the soil in the proposed reservoir area is classified as coastal soil and has a severe salinization degree with the average total salt content of 1.22%, the average Cl^-content of 0.61% and the average pH value of 8.44. Most of the surround soil of the proposed reservoir is classi- fied as coastal soil, only very little part of it is heavy saline soil or moderate saline soil, with the average total salt content of 1.37% and the averageCl^- content of 0.55%. Judging from the horizontal direction, the total salt content to the north of the Jingzhong River is much higher than that of the south. While from the vertical direction, the total salt content of soil decreases with the depth increasing of the surface to 1 meter depth range ; the total salt content of soil is the lowest and changes little between 1 meter and 4 meters depth ; the total salt content of soil increases with the depth increasing when the depth is more than 4 meters. According to the characteristics of severe salinization degree of the proposed reservoir, this paper puts forward corresponding suggestions of the reservoir operation.