Introducing Transport “Surprises” in the Classroom: The Visible Fracture
Introducing Transport “Surprises” in the Classroom: The Visible Fracture
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在课堂上介绍交通“惊喜”：可见的断裂
DOI：
10.1111/gwat.12875
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发表时间：
2018
期刊：
影响因子：
2.6
通讯作者：
Heinle, Ben
中科院分区：
文献类型：
--
作者：
Cardiff, Michael;Heinle, Ben
含水层性质的异质性，以及平流和弥散以外的输运过程的影响，通常会产生输运“意外”，因为测量结果很难与学生在水文地质学培训早期介绍的传统平流-弥散方程（ADE）的预测相一致。学生应该意识到ADE（通常应用）在生成有效预测的意义上可能并不总是“工作”的原因，并为此做好准备。虽然ADE的预测局限性在水文地质文献中经常被讨论，但我们的经验是，学生们对运输预测没有适当的怀疑。出于这个原因，我们认为这是必要的，未来几代水文地质学家介绍运输惊喜早在他们的启蒙教育。我们提出了一个实验室活动，围绕“可见的骨折”，这是在75分钟的实验课期间提出的。可见裂缝由两片树脂玻璃组成，围绕着一个充满不均匀液体的孔。将加热的流体注入裂缝中，并使用热致变色液晶（TLC）材料来可视化流动流体和周围有机玻璃“寄主岩石”中的温度。烟羽的可视化显示了由于宏观不均匀性而可能产生的复杂形状。裂缝内的示踪粒子允许学生检查非均匀的局部平流速度，并观察流体温度羽流的延迟。学生自我报告的知识调查表明，在经历了这一活动后，对交通非理想性有了更好的概念理解。
Heterogeneity in aquifer properties, and the influence of transport processes other than advection and dispersion, often produce transport “surprises” in that measurements become difficult to reconcile with predictions from the traditional advection‐dispersion equation (ADE) that students are introduced to early in their hydrogeology training. Students should be aware of and prepared for the reasons why the ADE (as commonly applied) may not always “work” in the sense of generating valid predictions. Though the predictive limitations of the ADE have been frequently discussed in the hydrogeologic literature, our experience is that students are not appropriately skeptical of transport predictions. For this reason, we believe it is imperative that future generations of hydrogeologists are introduced to transport surprises early in their formative education. We present a laboratory activity, centered around a “Visible Fracture,” which was presented in a laboratory class period of 75 min. The Visible Fracture consists of two sheets of Plexiglas surrounding a heterogenous fluid‐filled aperture. Heated fluid is injected into the fracture, and thermochromic liquid crystal (TLC) materials are used to visualize the temperature both in the flowing fluid and in the surrounding Plexiglas “host rock.” Visualization of the plume shows the complex shapes that can be produced due to macroscopic heterogeneity. Tracer particles within the fracture allow students to examine heterogeneous local advective velocities, and to observe retardation of the fluid temperature plume. Student self‐reported knowledge surveys indicate greater conceptual understanding of transport non‐idealities after experiencing this activity.
使用 Hele-Shaw 单元模拟的无承压沿海含水层中潮汐引起的地下水循环
影响因子：
5.8
作者：
Aaron J. Mango;M. Schmeeckle;D. Furbish
通讯作者：
D. Furbish
不确定性条件下圈定井捕获区的问题和选择
影响因子：
2.6
作者：
E. Frind;J. Molson
通讯作者：
J. Molson