崩壁不同土层水分运动特征的染色示踪

发布时间：2018-03-20 17:59

本文选题：崩岗　切入点：土壤含水量　出处：《福建农林大学学报(自然科学版)》2017年02期 　论文类型：期刊论文

【摘要】：以南方花岗岩崩岗崩壁不同土层土壤为研究对象,运用染色示踪和Photoshop CS5图像提取技术,记录水平方向上土壤剖面的染色面积和最大染色深度,以分析崩岗崩壁不同土层的水分运动分布特征.结果表明:红土层持水性能高于砂土层和碎屑层,但水分的侧向运移速率低于其他2个土层;在水平方向上10~30 cm内各土层土壤含水量均随深度的增加呈现逐渐减小的趋势;经过24 h染色入渗试验后,砂土层水平方向上0~9 cm和碎屑层0~13 cm内的染色面积均超过80%;红土层优先流现象明显,剖面染色比例小,亮蓝染色剖面呈条带状分布,其染色面积随深度的增加而缓慢下降;砂土层和碎屑层平均染色比例较大,亮蓝染色剖面呈块状均匀分布,并随深度的增加表现出先缓慢下降后迅速下降的趋势.
[Abstract]:Based on different soil layers of granite caving in southern China, dyeing tracer and Photoshop CS5 image extraction technique were used to record the dyeing area and maximum depth of soil profile in horizontal direction. The results show that the water holding capacity of red soil layer is higher than that of sand layer and clastic layer, but the lateral migration rate of water is lower than that of the other two layers. In the horizontal direction of 1030 cm, the soil moisture content of each soil layer decreased gradually with the increase of depth, and after 24 h dyeing infiltration experiment, the soil moisture content of each soil layer decreased gradually with the increase of soil depth. The dyeing area of 0 ~ 9 cm in horizontal direction of sand layer and 0 ~ 13 cm in clastic layer is more than 80 cm, the priority flow phenomenon of red soil layer is obvious, the proportion of section dyeing is small, the section of bright blue dye section is strip-shaped distribution, and its dyeing area decreases slowly with the increase of depth. The average dyeing ratio of sand layer and clastic layer is larger, and the bright blue section is distributed uniformly in block shape, and with the increase of depth, it shows a tendency of decreasing slowly first and then rapidly.
【作者单位】：福建农林大学资源与环境学院;
【基金】：国家自然科学基金资助项目(41001169,41571272) 国家科技支撑项目(2014BAD15B0303)
【分类号】：S152.7

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