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海岸或湖泊的沉积物底床在波浪作用下可以发生液化,液化后的底床沉积物在波动的过程中,将产生与水体的剧烈交换作用。本文以粉质土作为底床,利用波浪水槽试验,研究了埋置于底床一定深度层的Zn、Cu重金属在底床液化条件下的释放规律。试验结果表明,波浪扰动底床液化情况下,沉积物中重金属向水体中的释放量明显增加,且波浪扰动越大对重金属释放的促进作用越明显;整个体系中重金属的存在形态以颗粒态为主,其主要释放形式是吸附于粘土颗粒再悬浮进入上覆水体。
Abstract：Sedimentary beds in the coastal areas or lakes tend to liquefy under wave actions.During the oscillation of sediments after liquefaction,an intense bed-water exchange will take place subsequently.In this paper,silty soil was chosen as bed material in a wave flume to study the release of Zn and Cu by burying them in certain depth of the bed.Experimental results showed that when the bed liquefies due to disturbance of water waves,the release of heavy metals into the overlying water from the sediments increased significantly.In addition,the higher the disturbance energy was,the more significant its promotion was.In the whole system,the haevy metals mainly existed as granules absorbed on clay particles and released into the overlying water when re-suspended under wave actions.
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基本信息:
DOI：10.16441/j.cnki.hdxb.2013.08.015
中图分类号:X131.2
引用信息:
[1]郝廷,许国辉,王刚,等.底床液化下沉积物中重金属释放规律的水槽试验研究[J],2013,43(08):92-98.DOI:10.16441/j.cnki.hdxb.2013.08.015.
基金信息:
国家自然科学基金项目(41076021)资助