| 人工粘土层在枯水期对小清河氧化塘底质水盐运动的抑制模拟研究 |
| 摘要点击 710 全文点击 447 修订日期：1993-10-28 |
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| 中文关键词 氧化塘底质 水盐运移 模拟试验 |
| 英文关键词 oxidative pond sediment waterborne salt transport simulation |
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| 中文摘要 |
| 利用实验室士柱模拟装置对枯水条件下盐渍地区氧化塘不同底质土壤结构的水盐运移状况进行了定性模拟研究。结果表明,原底质均质白汤土输水能力较大,蒸发较易发生,因而带动盐分在塘底表面大量累积,维持该水盐运移的最大吸力值为120cm水柱。而经人工改造后,表层有30cm粘土覆盖的土壤层结构对水盐运移有强烈的抑制作用,在模拟3个月的蒸发时间内表面没有盐分累积。 |
| 英文摘要 |
| The modelling studies have been qualitatively carried out on the movement of waterborne salt through different stratified structures of the sediment of oxidative ponds in a salinized Xiaoqinghe area during dry seasons by using simulated soil columns in laboratory. The results show that the homogenous earth of original sediment has a high ability to transport water and is prone to allow water to be evaporated,making the waterborne salt to be carried up and largely accumulated on the surface of pond bottom. The maximum suction head to maintain such a waterborne salt movement was found to be 120 cm water column pressure. However,a 30 cm thick clay layer artificially covered on the top surface of the original sediment shows a strong suppression against the waterborne salt movement even if the suction head is over 800 cm water column prissure. No salt content was found to be accumulated on the surface during a 3 month period of simulated evaporation. |
