中子活化示踪沙技术在泥沙运动研究中的应用

Application of neutron activation tracer sand technology in the study on sediment movement

根据我国海岸泥沙的元素含量情况,选取铱(Ir)作为信号元素,采用化学吸附标记的方法制作示踪沙,应用中子活化分析方法检测泥沙中信号元素的含量,依据信号元素的运动特征判断泥沙的运动规律。该方法克服了荧光沙技术和放射性示踪沙技术的缺点,并能真实地模拟天然泥沙的运动特性,先后在天津港、珠江口、黄骅港及长江口等应用,取得了很好的效果。

According to the element content of coastal sediment,we select the Iridium（Ir） as the signal element,use the method of chemisorption labeling in tracer sand,adopt the neutron activation analysis to detect the signal element content of sediment,and determine the law of sediment movement based on the movement characteristics of the signal element.This method overcomes the shortcomings of the fluorescence tracer technology and radioactive tracer technology,and can simulate the real movement features of natural sediment.It has been successfully applied to the engineering in Tianjin Port,the Pearl River estuary,Huanghua Port and the Yangtze River estuary,etc.