Figure 1 and Figure 2 demonstrate the collection of continuous monitoring scour data from the Flint River location. Figure 3 demonstrates an example of the wire weight gage being used to collect cross-sectional information of the Flint River on 11 July 2008. Ultimately, the goal is for measured levels of streambed elevation, along with flow conditions will be used calibrate scour predication equations for Michigan specific conditions. In addition to the monitoring of scour through the use of a sonar device and the wire weight gauge, the study team has recently acquired an Acoustic Doppler Current Profiler (ADCP) to measure scour depth as well as quantify discharge and velocity. Scour is a near bed process, relating velocity from this region to scour is more appropriate than utilizing average cross-sectional velocities as often obtained by one-dimensional models. An example of ADCP velocity distribution is presented above in Figure 4. The ADCP will also potentially be able to determine the velocity of bed material under live-bed flow conditions. In addition to providing more useful information to quantify scour, the ADCP will be used to calibrate model cross-sections, this is especially necessary for scour monitoring locations without a USGS gauge on site.
Figure 1: Continuous scour monitoring equipment deployment at the Flint River M15 Bridge
Figure 2: Discharge and depth to bed for M15 Continuous Monitoring Site.
Figure 3: Using the wire weight gauge to profile the stream bed at the M-15 Flint River Crossing.
Figure 4: An example of the velocity distribution on the Pigeon River collected on 29 April 2009