摘要
根据长安少陵塬杨湾黄土剖面含水层的调查、含水量、孔隙度测定和粒度分析,研究了黄土含水层与隔水层的分布、含水条件及其与第四纪气候变化的关系。结果表明,长安杨湾剖面黄土地层含水量变化代表了与以往研究不同的变化类型,含水量峰值出现在黄土层中,低值出现在红色古土壤层中;从上向下含水量与孔隙度呈波动变化规律;在所研究的剖面中出现的5个含水层均由黄土层构成,隔水层由红色古土壤构成。研究剖面中含水层与隔水层的水理性质主要是它们形成时的气候不同决定的。红色古土壤的隔水性是由于温湿气候条件下的粘土化作用产生的,黄土层的含水空间发育好主要是当时相对冷干的气候条件下的较弱的成壤作用造成的。含水空间发育较好的黄土层和粘化强的红色古土壤隔水层的存在是该黄土剖面中地下水富集的两个基本条件。
On the basis of the investigation of the water bearing layers,moisture content, grain size,porosity and microstructure determination in loess profile at Yangwan village of Chang'an county,the change of moisture and the distribution of the water bearing layers and water resisting layers,bearing water condition and correlation between them and Quaternary climate change are studied.The results show that the change of moisture content of the loess stratum represents a change type different from that reached before.The higher water content occurs in the loess layers and the lower water content occurs in the red paleosol layers.From the upper to the lower,the moisture content and the porosity have the fluctuation change law;and the five water bearing layers are all consist of loess layers and the water resisting layers are consist of red paleosols.Property of the water bearing layers and the water resisting layers was determined by the climate when they formed.Water bearing space of loess layers developed well was determined by weak soil formation action in the cold-arid climate at that time.The property of water resisting of red paleosols was determined by intense clay grouting and clay mineral formation action in the warm-moist climate at that time. Two basic conditions of ground water enrichment are loess layer with developed well water bearing space and red paleosol layer as water resisting layer with intense clay grouting characteristics.
出处
《中国沙漠》
CSCD
北大核心
2007年第6期955-959,共5页
Journal of Desert Research
基金
国家自然科学基金项目(40672108)
中国科学院黄土与第四纪地质国家重点实验室项目(SKLLQG0705)
关键词
黄土地下水
含水层
隔水层
气候控制
Loess groundwater
water bearing layers
water resisting layer
climate controlling