摘要
通过静水沉降试验初步研究了天然河水中常见阳离子Ca2+对泥沙淤积干容重的影响。试验结果表明:①Ca2+浓度对泥沙淤积干容重的影响较大,随着Ca2+浓度增加,干容重的变化分为三个阶段:第一阶段干容重减小,第二阶段干容重增加并达到最大值,第三阶段Ca2+浓度继续增加后干容重减小最后趋于不变;②Ca2+浓度相同的情况下,泥沙浓度对干容重影响根据所加Ca2+浓度不同可分为三个阶段:第一阶段(Ca2+浓度在0~4mmol/l之间)随泥沙浓度增加干容重增加,第二阶段(Ca2+浓度在4~10mmol/l之间)干容重与各泥沙浓度在不同Ca2+浓度下的峰值有关,第三阶段(Ca2+浓度大于10mmol/l)干容重随泥沙浓度增加而增加;③Ca2+浓度、泥沙浓度相同时,中值粒径越大干容重越大,且中值粒径大的沙干容重达到最大值所需Ca2+少。
This paper studies the influence of Ca^2+ concentration on the dry bulk density of sedimentation by settling experiments. The results show that : ( 1 ) the influence of Ca^2+concentration on the dry bulk density is obvious and the change of dry density with the increase of Ca^2+ concentration can be divided into three phases, i.e. firstly decrease, then increase to the maximum, and finally maintain stable; (2) under the same Ca^2+ concentration, the influence of sediment concentration on dry bulk density can also be divided into three phases, i.e. first the density increases with the sediment concentration if Ca^2+ concentration is 0 - 4mmol/l, second the density is related to the maximum values of different Ca^2+concentration when Ca^2+ concentration is 4 - 10 mmol/l, and third the density increases with the sediment concentration under the Ca^2+ concentration over 10 mmol/l; and (3) when Ca^2+ concentration is equal to sediment concentration, the dry bulk density increases with sediment median size.
出处
《泥沙研究》
CSCD
北大核心
2006年第5期69-72,共4页
Journal of Sediment Research
基金
国家自然科学基金项目(50479036)
国家重点基础研究发展计划(973)资助项目(2003CB415205)
湖北省创新群体基金项目(2003ABA195)
博士点基金项目(20020486017)资助
关键词
干容重
CA^2+浓度
泥沙浓度
中值粒径
dry bulk desntiy
Ca^2+ concentration
sedimetn concentration
median size
作者简介
黄荣敏(1981-),男,湖北黄梅人,武汉大学硕士研究生,主要从事泥沙运动基本理论研究。E-mail:rmhuang88@sina.com