海堤边坡土壤水盐运动规律的研究

Study on the Water-Salt Movement Characteristics in the Seawall Side Slope Soil

海堤绝大多数是回填土,又高于周边土地,为了给海堤造林及其管理提供依据,需要探明海堤边坡水盐运动规律。本文通过对海堤外坡地下水及盐分含量的研究表明:地下水位和含盐量高而稳定;降雨和蒸发量在年内分配不均,形成土壤季节性的水盐动态;年际间气候稳定,盐分动态一致性也比较大。但海堤边坡土壤上中下坡高程不同,导致地下水位不同,加上整个坡面土壤粘重,毛管水运动复杂,因此上中下坡水盐运动差异明显。

The seawall is mostly made of backfill soil and higher than the surrounding land. The water-salt movement characteristics of the seawall side slope need to be revealed in order to provide basis for the seawall afforestation and management. In this paper the groundwater and salt content of the seawall outward side slope were studied. The results showed that the groundwater level and salt content were both high and stable. The uneven distribution of the precipitation and evaporation in a year caused the seasonal water-salt variation of the soil. The stable inter-annual climate led to the high consistency of the salt variation. Different elevations of the upper, middle and lower slopes of the seawall soil led to different groundwater levels and there were significant differences among the water-salt movements of the upper, middle and lower slopes due to the heavy soil of the whole slope and complicated capillary water movement.