發(fā)布時(shí)間：2018-02-25 15:40

  本文關(guān)鍵詞： 大布蘇湖 泥林 潛流 凍融作用 黃土　出處：《河海大學(xué)學(xué)報(bào)(自然科學(xué)版)》2017年03期 　論文類型：期刊論文

【摘要】：針對(duì)大布蘇湖東岸發(fā)生的土體坍塌與泥林的成因,開展地下潛流來源及破壞機(jī)制研究。結(jié)果表明:土壤中上層大于下層的鹽分分布排除了降水入滲補(bǔ)給地下水的可能性;同位素分析結(jié)果證實(shí),大布蘇湖水來自于地下水的補(bǔ)給,地下潛流來自于周邊河流的滲漏。滲漏水通過黃土層下伏的粉砂層向大布蘇湖中排泄,這成為泥林不斷擴(kuò)張的原因之一:粉砂層之上黃土中的風(fēng)塵顆粒不斷地被潛流帶到湖泊,在黃土層下部形成孔洞,逐漸發(fā)展并最終形成塌陷。此外,凍融作用也進(jìn)一步加劇了滲透破壞程度。地下潛流、細(xì)顆粒流失與凍融作用是造成土體破壞的主要原因,防止細(xì)顆粒流失與凍融作用發(fā)生是預(yù)防土體進(jìn)一步破壞的關(guān)鍵因素。
[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.

【作者單位】： 吉林大學(xué)環(huán)境與資源學(xué)院;河海大學(xué)土木與交通學(xué)院;
【基金】：國(guó)家自然科學(xué)基金(51578212) 吉林省水利廳原始創(chuàng)新項(xiàng)目(2130331)
【分類號(hào)】：P641;P642.2
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本文編號(hào)：1534149