Application of an Ultrasonic Sensor to Monitor Soil Erosion and Deposition

Abstract

HighlightsA sediment monitoring system was developed to measure erosion and deposition.The system uses an ultrasonic sensor to take high-frequency measurements.Tests in controlled lab settings showed high accuracy.The system measured 43.5 cm of deposition from two storm events.Abstract. Monitoring erosion at high temporal resolution can provide researchers and managers the data necessary to manage erosion. Current erosion monitoring methods tend to be invasive to the area of interest, record low-frequency measurements, have a narrow spatial range of measurement, or are expensive. There is a need for an affordable system capable of monitoring erosion and deposition non-invasively at high temporal resolution. The objectives of this research were to (1) design and construct a non-invasive sediment monitoring system (SMS) using an ultrasonic sensor capable of monitoring erosion and deposition continuously, (2) test the system in the lab and field, and (3) determine the applications and limitations of the system. The SMS was tested in the lab to determine the extent to which the soil type, slope, surface topography, change in distance, and vegetation impacted the measurements of the ultrasonic sensor. Soil type, slope, and surface topography had little effect on the measurement, but distance and the introduction of vegetation impacted the measurement. In the field during high flows, as erosion and deposition occurred, the changes in distance were determined in near real-time, allowing calculation of erosion and deposition quantities. The SMS was deployed to monitor deposition on sandy streambanks in the Nebraska Sandhills and erosion on a streambank and field plot in Lincoln, Nebraska. The SMS proved successful in measuring sediment change during high-flow events but yielded some error: ±1.06 mm in controlled lab settings and ±10.79 mm when subjected to environmental factors such as temperature, relative humidity, and wind. Keywords: Deposition, Erosion, Monitoring, Ultrasonic sensor.

Streambank Erosion Phenomena and Understanding: Current Research and Future Directions

“…Relevant examples of available process-based models include FLU-VIAL-12 (Chang, 1998), CONCEPTS (Langendoen et al, 2001), SWAT (Arnold et al, 1998), and the coupled HEC-RAS 1D with BSTEM (CEIWR-HEC, 2015). Studies from this special collection contributed to advancing data collection methods (e.g., Knox and Mittelstet, 2021;Fox et al, 2022) and characterizing the variability of site-specific parameters (e.g., Wilson et al, 2022). However, previous studies that have assessed streambank erosion simulation typically find that process-based models have difficulty capturing the complexity of erosion processes (Myers et al, 2021).…”

“…Overall, the studies in this special collection are unified in their overarching goal of improving quantitative and predictive understanding of streambank erosion phenomena. Knox and Mittelstet (2021) addressed a research need stated by Bigham (2020) related to assessing the spatiotemporal variability of techniques to measure the effect of streambank stabilization techniques on the local bank over time. Knox and Mittelstet (2021) developed a sediment monitoring system (SMS) using an ultrasonic sensor.…”

“…Knox and Mittelstet (2021) addressed a research need stated by Bigham (2020) related to assessing the spatiotemporal variability of techniques to measure the effect of streambank stabilization techniques on the local bank over time. Knox and Mittelstet (2021) developed a sediment monitoring system (SMS) using an ultrasonic sensor. The sensor was developed to take high-frequency measurements to quantify erosion and deposition.…”