Journal
WATER RESOURCES RESEARCH
Volume 54, Issue 6, Pages 4040-4058Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2017WR022238
Keywords
suspended sediment; hysteresis; concentration-discharge relationships; pattern recognition; restricted Boltzmann machine; event sediment dynamics
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Funding
- Vermont EPSCoR
- National Science Foundation (NSF) [EPS-1101317, OIA-1556770]
- NSF [DGE-0925179NSF]
- Vermont Water Resources and Lake Studies Center
- Gund Institute for Environment
- Robert & Patricia Switzer Foundation
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Studying the hysteretic relationships embedded in high-frequency suspended-sediment concentration and river discharge data over 600(+) storm events provides insight into the drivers and sources of riverine sediment during storm events. However, the literature to date remains limited to a simple visual classification system (linear, clockwise, counter-clockwise, and figure-eight patterns) or the collapse of hysteresis patterns to an index. This study leverages 3 years of suspended-sediment and discharge data to show proof-of-concept for automating the classification and assessment of event sediment dynamics using machine learning. Across all catchment sites, 600(+) storm events were captured and classified into 14 hysteresis patterns. Event classification was automated using a restricted Boltzmann machine (RBM), a type of artificial neural network, trained on 2-D images of the suspended-sediment discharge (hysteresis) plots. Expansion of the hysteresis patterns to 14 classes allowed for new insight into drivers of the sediment-discharge event dynamics including spatial scale, antecedent conditions, hydrology, and rainfall. The probabilistic RBM correctly classified hysteresis patterns (to the exact class or next most similar class) 70% of the time. With increased availability of high-frequency sensor data, this approach can be used to inform watershed management efforts to identify sediment sources and reduce fine sediment export.
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