Bathymetric and Water Velocity Data on the Upper St. Croix River Between Riverside and St. Croix Falls, Wisconsin, May 3–10, 2022

From May 3–10, 2022, bathymetric and water velocity data were collected on the St. Croix River between Riverside and St. Croix Falls, Wisconsin. Bathymetry and water velocity data were collected at 2 transects for 102 cross sections over the approximately 120-kilometer (km) survey reach. Longitudinal profile bathymetry transects were also collected between each cross section. These data were collected with a Teledyne RD Instruments RiverRay acoustic Doppler current profiler (ADCP) and georeferenced using two Trimble R10 Global Navigation Satellite System (GNSS) receivers (R10). Due to field site constraints (poor cell service and long distances of travel), R10 data could not be collected using a real-time network survey or real time kinematic survey. Data were collected using a post-processed kinematic (PPK) method where one base R10 was set over a known benchmark to collect static data from the beginning to the end of the survey. The other rover R10 in the boat collected raw, continuous data at a 1-second interval. The data from both the base and rover R10s were post-processed using Trimble Business Center software version 5.80 to achieve centimeter-level accuracy. The raw ADCP data were post-processed using the Velocity Mapping Toolbox (VMT) version 4.09 (Parsons and others, 2013) and the corrected GNSS data, including water surface elevations at the time of survey were merged with VMT bathymetry output files.

2022年5月3日至10日，研究团队于美国威斯康星州河畔（Riverside）与圣克罗伊瀑布（St. Croix Falls）之间的圣克罗伊河（St. Croix River）开展水深与水流流速数据采集工作。本次调查河段总长约120千米，共布设102个横断面，针对上述横断面在2条测线上采集了水深与流速数据；同时在各横断面之间布设纵剖面水深测线并完成数据采集。本次数据采集采用泰莱达因RD仪器公司（Teledyne RD Instruments）RiverRay型声学多普勒流速剖面仪（acoustic Doppler current profiler，ADCP），并使用2台天宝R10型全球导航卫星系统（Global Navigation Satellite System，GNSS）接收机（R10）完成数据地理配准。由于野外场地存在诸多限制（蜂窝信号极差且通勤距离较长），无法采用实时网络测量或实时动态测量方式采集R10接收机数据，因此采用后处理动态定位（post-processed kinematic，PPK）方法开展工作：1台基准R10接收机架设至已知基准点上，在整个调查时段内采集静态数据；船上搭载的另一台流动R10接收机以1秒的采样间隔采集原始连续观测数据。基准站与流动站的R10接收机数据均通过天宝业务中心（Trimble Business Center）软件v5.80进行后处理，以实现厘米级定位精度。原始ADCP数据采用流速映射工具箱（Velocity Mapping Toolbox，VMT）v4.09（Parsons等，2013）完成后处理，同时将修正后的GNSS数据（含调查时刻的水面高程）与VMT输出的水深数据文件进行合并。