摘要
声波能引起流体介质中微滴群携带运动、碰撞团聚并促进重力沉降.本文旨在研究声波干预下河水和雨水源液滴群同位素响应特征.通过室内实验和理论分析,研究了环境和液滴物理参数对沉降滴群D-^(18)O同位素值的影响.研究发现:(1)声波干预后液滴群特征粒径增大,液滴沉降过程中会与环境水汽发生同位素交换,其同位素值受滴群参数(粒径分布和浓度)和声波参数(频率、声强及作用时间)的综合影响;(2)液滴群同位素理论计算值能较好拟合δ^(18)O和δD的线性关系并反映与沉降环境的交叉接近现象,相对误差在5.53%以内.本文所研究的大气同位素特征,对野外降水同位素变化特征的认识具有一定的借鉴意义.
The low-frequency strong acoustic wave can cause the vibration of the air medium,thus promoting the collision and agglomeration of droplets in the fluid medium and realize the gravity settlement.In this study,the isotopic response characteristics of droplets of river and rain sources under the sound waves intervention were investigated.Through laboratory experiments and theoretical analysis,the effects of environmental and droplet physical parameters on the D-^(18)O isotopic value during droplets settling were studied.The results show that:(1)The characteristic size of droplets increases after acoustic intervention,and isotope exchange occurs during droplet settlement.The isotope values were affected by droplet parameters such as size distribution and surface area and acoustic parameters such as frequency and sound intensity.(2)The theoretical value of droplet isotope can better fit the linear relationship betweenδ^(18)O andδD and reasonably reflect the cross-close phenomenon,and the relative error is less than 5.53%.The atmospheric isotope characteristics studied in this paper have certain reference for understanding the isotope variation characteristics of field precipitation.
作者
柏文文
魏加华
杨海娇
贺巨龙
时洋
李琼
BAI Wenwen;WEI Jiahua;YANG Haijiao;HE Julong;SHI Yang;LI Qiong(School of Water Resources and Electric Power,Laboratory of Ecological Protection and High-Quality Development in the Upper Yellow River,State Key Laboratory of Plateau Ecology and Agriculture,Key Laboratory of Water Ecology Remediation and Protection at Headwater Regions of Big Rivers,Ministry of Water Resources,Qinghai University,Xining 810016,China;State Key Laboratory of Hydroscience and Engineering,Tsinghua University,Beijing 100084,China)
出处
《应用基础与工程科学学报》
EI
CSCD
北大核心
2022年第6期1357-1365,共9页
Journal of Basic Science and Engineering
基金
国家重点研发计划项目(2017YFC0403600)
清华大学水沙科学与水利水电工程国家重点实验室开放基金(sklhse-2022-B-02)
青海大学中青年科研基金项目(2018-QGY-8)
国家自然科学基金项目(52009059,52209092)
中国博士后科学基金(2021T140385)
关键词
低频声波
液滴
声波团聚
氢氧同位素
环境水汽
low-frequency acoustic wave
droplet
acoustic agglomeration
hydrogen and oxygen isotopes
environmental water vapor
