大布苏湖岸泥林地下潜流破坏成因

发布时间：2018-02-25 15:40

  本文关键词： 大布苏湖 泥林 潜流 冻融作用 黄土　出处：《河海大学学报(自然科学版)》2017年03期 　论文类型：期刊论文

【摘要】：针对大布苏湖东岸发生的土体坍塌与泥林的成因,开展地下潜流来源及破坏机制研究。结果表明:土壤中上层大于下层的盐分分布排除了降水入渗补给地下水的可能性;同位素分析结果证实,大布苏湖水来自于地下水的补给,地下潜流来自于周边河流的渗漏。渗漏水通过黄土层下伏的粉砂层向大布苏湖中排泄,这成为泥林不断扩张的原因之一:粉砂层之上黄土中的风尘颗粒不断地被潜流带到湖泊,在黄土层下部形成孔洞,逐渐发展并最终形成塌陷。此外,冻融作用也进一步加剧了渗透破坏程度。地下潜流、细颗粒流失与冻融作用是造成土体破坏的主要原因,防止细颗粒流失与冻融作用发生是预防土体进一步破坏的关键因素。
[Abstract]:According to the causes of Dabusu lake to the east coast the collapse of soil and mud forest, to carry out the research on subsurface flow sources and failure mechanism. The results showed that the soil in the upper layer than the lower salinity distribution excluded precipitation into groundwater recharge possibility; isotope analysis results confirmed that Dabusu lake from the groundwater recharge, leakage from underground the surrounding rivers. Water leakage through the loess layer underlying silty sand to Dabusu Lake in excretion, which became one of the reasons for the continuous expansion of the mud forest: aeolian silty sand particles on loess are constantly submerged flow into lakes, the hole formed in the loess layer is gradually developed, and ultimately the formation of collapse. In addition, freezing and thawing also increased permeability damage. Subsurface flow, fine particle erosion and freeze-thaw action is a major cause of soil damage, prevent fine particle erosion and freeze-thaw action Occurrence is the key factor to prevent further destruction of soil.

【作者单位】： 吉林大学环境与资源学院;河海大学土木与交通学院;
【基金】：国家自然科学基金(51578212) 吉林省水利厅原始创新项目(2130331)
【分类号】：P641;P642.2
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本文编号：1534149