长江宜昌段枯水期河水扩散特征

介绍了使用示踪剂在长江宜昌段枯水期进行的扩散试验。试验结果表明，示踪剂的横向浓度分布方差随纵向距离增加而增大；无量纲横向扩散系统可由ky／ud＝－0.92＋0.82log（B／d）加以计算。通过对试验结果的分析，给出了稀释不均匀因子和污染物在河流中浓度增量的经验公式．     

Numerical study of water age influenced by tide and runoff in Daliaohe Estuary in China

Based on the concept of the age, the water transport characteristics as the response to the runoff and the tide in Daliaohe Estuary in China are studied under different hydrodynamic conditions using a three-dimensional convection-diffusion model. The results show that the relationship between the average age at a specific position and the runoff could be expressed by a power function approximately. In the river channel, the runoff controls the water transport: it might take about 52 d, 27 d and 15 d for the water parcel to be transported from Sanchahe to the mouth during the dry, normal and rainy seasons, respectively. Outside the mouth, the tide is dominant even though the difference between the spring tide and the neap tide is less than 5 d, and the water parcel transports mainly along the northwest direction through the West Waterway and the southeast direction through the East Waterway. A significant age stratification emerges in the vicinity of the mouth, in which there exists a strong interaction between the tide and the runoff, and the age differences between the surface and the bottom could reach 7 d.     

裂隙岩体渗流研究中的同位素示踪模型

总结了同位素示踪方法在裂隙岩体渗流研究中的应用，分析了单孔点稀释模型，双井模型及二维交叉裂隙渗流模型的优，缺点，提出了需要进一步研究的问题。     

考虑示踪剂弥散作用的渗透流速计算方法

本文在示踪剂质量守恒的基础上,考虑其弥散作用,采用单孔测试技术,推导了含水层水平流速计算公式并求解.最后,应用于工程实例结果表明,当存在较强的垂向流时,弥散作用对水平流速计算结果影响很大,不可忽略.