(Exp. 4op) Artificial oxygen fluxes measured by the eddy correlation method using oxygen optodes in a flume experiment

Flume experiments were conducted in February 2013 at the Institute for Environmental Sciences, University of Koblenz-Landau Landau. Experiments were performed in a closed oval-shaped acrylic glass flume with cross-sectional width of 4 cm and height of 10 cm and total length of 54 cm. The fluid flow was induced by a propeller driven by a motor and mean flow velocities of up to 20 cm s-1 were generated by applying voltages between 0 V and 4 V DC. The flume was completely sealed with an acrylic glass cover. Oxygen sensors were inserted through rubber seal fittings and allowed positioning the sensors with inclinations to the main flow direction of ~60°, ~95° and ~135°. A Clark type electrochemical O2 microsensor with a low stirring sensitivity (0.7%) was tested and a fast-responding needle-type O2 optode (PyroScience GmbH, Germany) was used as reference as optodes should not be stirring sensitive. […]

2013年2月，于科布伦茨-兰道大学兰道校区环境科学研究所开展了水槽实验。本次实验在封闭椭圆形亚克力玻璃水槽中进行，该水槽横截面宽度为4 cm、高度为10 cm，总长度为54 cm。流体流动由电机驱动的螺旋桨诱导，通过施加0 V至4 V的直流电压，可获得最高达20 cm·s⁻¹的平均流速。水槽全程以亚克力玻璃盖板实现完全密封。通过橡胶密封接头插入氧气传感器，可将传感器相对于主流方向以约60°、约95°及约135°的倾角进行布设。本次实验测试了一款搅拌灵敏度为0.7%的克拉克型电化学氧气微传感器，并选用产自德国Pyro科学有限公司（PyroScience GmbH）的响应快速针型光学氧传感器(optode)作为参比设备，因光学氧传感器本身不具备搅拌敏感性。[…]