Dye Concentration at Station FL3 Downstream of Lock and Dam 14 near Pleasant Valley, Iowa (June 2017)

These data were collected in support of a multi-agency effort to evaluate the feasibility of using carbon dioxide to create a barrier and prevent upstream passage of invasive fish through navigational locks. The auxiliary lock at Lock and Dam 14 on the Mississippi River near Pleasant Valley, Iowa, was chosen for a field-scale trial of the carbon dioxide barrier to be conducted in 2018. In preparation for this trial, the mixing in the lock chamber during routine operations and the fate and transport of lock water released to the pool downstream was studied using a dye tracer. In June 2017, the U.S. Geological Survey (USGS) performed two injections of Rhodamine WT dye into the auxiliary lock chamber as the lock was filled. The dye was injected directly into the fill water at the upstream valves on both sides of the lock. The first injection of 0.82 liters of Rhodamine WT (0.41 liters per intake) occurred at 9:50 am on June 13, 2017. The second injection of 0.25 liters of Rhodamine WT (0.125 liters per intake) occurred at 12:11 pm on June 13, 2017. Both injections started approximately 1 minute after filling of the lock began and the injections took approximately 2 minutes to complete. The total time to fill the auxiliary lock in both cases was 6 minutes. All times are in Central Daylight Time (CDT). The distribution of dye within the lock chamber and downstream of the lock was measured using eight Turner Designs C3 submersible fluorometers (1 in vertical profiling mode in the lock chamber, 6 at fixed locations downstream of the lock, and 1 mounted on a mobile survey vessel). This data release is comprised of a time series of dye concentration at a fixed location downstream of the auxiliary lock chamber at Lock and Dam 14 on the Mississippi River near Pleasant Valley, Iowa, on June 13, 2017 and June 14, 2017. The measurements were obtained using a Turner Designs C3 submersible fluorormeter (SN 2300151) deployed at a fixed depth below the water surface. All parameters (dye concentration, turbidity, and temperature) were sampled at 5-second intervals.本数据集采集自一项多机构协作项目，旨在评估利用二氧化碳构建阻隔屏障、防止入侵鱼类通过通航船闸逆流通行的可行性。 位于艾奥瓦州普莱森特谷附近密西西比河上的14号船闸大坝辅助船闸，被选为2018年二氧化碳阻隔屏障现场试验的实施场地。 为筹备本次试验，研究团队采用染料示踪剂，对船闸室日常运行过程中的水体混合情况，以及泄放入下游池区的船闸水的归趋与迁移规律展开了研究。 2017年6月，美国地质调查局（U.S. Geological Survey, USGS）在辅助船闸充水过程中，向船闸室内两次注入罗丹明WT（Rhodamine WT）染料。 染料直接注入船闸两侧上游阀门处的充水水体中。 第一次注入于2017年6月13日上午9:50进行，共注入0.82升罗丹明WT染料（每个进水口注入0.41升）。 第二次注入于当日下午12:11进行，共注入0.25升罗丹明WT染料（每个进水口注入0.125升）。 两次注入均在船闸充水启动约1分钟后开始，且各自耗时约2分钟完成。 两次辅助船闸充水总时长均为6分钟。所有时间均采用中部夏令时（Central Daylight Time, CDT）。 研究团队采用8台Turner Designs C3型水下荧光计，对船闸室内及船闸下游的染料分布情况进行测量：1台在船闸室内以垂直剖面模式采集数据，6台部署在船闸下游固定点位，另有1台安装在移动测量船上。 本数据集包含2017年6月13日及14日，位于艾奥瓦州普莱森特谷附近密西西比河14号船闸大坝辅助船闸下游固定点位的染料浓度时间序列数据。 本次测量采用一台序列号为2300151的Turner Designs C3型水下荧光计，部署于水面下固定深度处开展。 所有参数（染料浓度、浊度与水温）均以5秒为间隔进行采样。