Survey of velocity at cross sections in the Chicago Sanitary and Ship Canal near Sag Junction, Chicago, IL (December 7, 2010)

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 Hemisphere Crescent A100 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 four individual transects at each cross section. These data were collected by the U.S. Geological Survey (USGS) concurrently with environmental DNA (eDNA) sampling in this reach of the Chicago Sanitary and Ship Canal (CSSC) by the U.S. Fish and Wildlife Service (USFWS). NOTE: Any data assigned a value of "-9999" are bad 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为12的1200千赫TRDI Rio Grande声学多普勒流速剖面仪（ADCP），在移动船舶上以25厘米距离单元采集所得。 数据通过半球Crescent A100型差分全球定位系统（GPS）接收机完成地理配准，该接收机具备亚米级精度。 本数据集通过流速映射工具箱（Velocity Mapping Toolbox，Parsons等，2013）进行处理，从每个水文断面的4条独立测线中提取得到该断面的平均流速场。 本数据集由美国地质调查局（USGS）采集，采集工作与美国鱼类及野生动物管理局（USFWS）在芝加哥卫生与船舶运河（CSSC）该河段开展的环境DNA（eDNA）采样同步完成。 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, Jackson P R, Czuba J A, Engel F L, Rhoads B L, Oberg K A, Best J L, Mueller D S, Johnson K K, Riley J D. (2013) 流速映射工具箱（VMT）：面向移动载体ADCP测量数据的处理与可视化套件. 地球表面过程与地貌, 38: 1244–1260. doi: 10.1002/esp.3367