Survey of velocity at cross sections in the Des Plaines River near Brandon Road Lock and Dam, Joliet, Illinois (October 19, 2015)

These data were collected using a 1200 kHz TRDI Rio Grande acoustic Doppler current profiler (ADCP) in mode 12 with 25 centimeter bins from a moving boat. The data were georeferenced with a Trimble AG132 differential Global Positioning System (GPS) receiver with submeter accuracy. The data were processed in the Velocity Mapping Toolbox (Parsons and others, 2013) to obtain a mean velocity field for each cross section from individual transects at each cross section. These data were collected in support of the US Army Corps of Engineers Great Lakes and Mississippi River Interbasin Study (GLMRIS), and were concurrent with a dye-tracing study. NOTE: Any data assigned a value of "-9999" are invalid or missing data and should not be used for analysis. Parsons, D. R., Jackson, P. R., Czuba, J. A., Engel, F. L., Rhoads, B. L., Oberg, K. A., Best, J. L., Mueller, D. S., Johnson, K. K. and Riley, J. D. (2013), Velocity Mapping Toolbox (VMT): a processing and visualization suite for moving-vessel ADCP measurements. Earth Surf. Process. Landforms, 38: 1244–1260. doi: 10.1002/esp.3367本数据集采用工作模式12的1200 kHz TRDI Rio Grande声学多普勒流速剖面仪（Acoustic Doppler Current Profiler，ADCP），在移动船体上以25厘米为距离分层开展走航式数据采集。所有数据通过配备亚米级精度的Trimble AG132差分全球定位系统（Global Positioning System，GPS）接收机完成地理坐标配准。本数据集借助《流速制图工具箱（Velocity Mapping Toolbox）》（Parsons等，2013）进行后处理，从各断面的单次走航测线数据中提取得到对应断面的平均流场。本数据集的采集工作旨在支撑美国陆军工程兵团五大湖与密西西比河跨流域研究（GLMRIS），且与同期开展的染料示踪研究同步进行。注意：所有赋值为"-9999"的数据均为无效或缺失数据，不得用于分析。参考文献：Parsons, D. R. 等（2013）. 流速制图工具箱（VMT）：面向走航式ADCP观测数据的处理与可视化套件. 《地球表面过程与地貌（Earth Surf. Process. Landforms）》, 38: 1244–1260. DOI: 10.1002/esp.3367