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An enhanced Bayesian fingerprinting framework for studying sediment source dynamics in intensively managed landscapes
Journal article   Open access   Peer reviewed

An enhanced Bayesian fingerprinting framework for studying sediment source dynamics in intensively managed landscapes

B Abban, A N (Thanos) Papanicolaou, M. K Cowles, C. G Wilson, O Abaci, K Wacha, K Schilling and D Schnoebelen
Water Resources Research, Vol.52(6), pp.4646-4673
06/2016
DOI: 10.1002/2015WR018030
url
https://doi.org/10.1002/2015WR018030View
Published (Version of record) Open Access

Abstract

An enhanced revision of the Fox and Papanicolaou (hereafter referred to as “F‐P”) (2008a) Bayesian, Markov Chain Monte Carlo fingerprinting framework for estimating sediment source contributions and their associated uncertainties is presented. The F‐P framework included two key deterministic parameters, α and β, that, respectively, reflected the spatial origin attributes of sources and the time history of eroded material delivered to and collected at the watershed outlet. However, the deterministic treatment of α and β is limited to cases with well‐defined spatial partitioning of sources, high sediment delivery, and relatively short travel times with little variability in transport within the watershed. For event‐based studies in intensively managed landscapes, this may be inadequate since landscape heterogeneity results in variabilities in source contributions, their pathways, delivery times, and storage within the watershed. Thus, probabilistic treatments of α and β are implemented in the enhanced framework to account for these variabilities. To evaluate the effects of the treatments of α and β on source partitioning, both frameworks are applied to the South Amana Subwatershed (SASW) in the U.S. midwest. The enhanced framework is found to estimate mean source contributions that are in good agreement with estimates from other studies in SASW. The enhanced framework is also able to produce expected trends in uncertainty during the study period, unlike the F‐P framework, which does not perform as expected. Overall, the enhanced framework is found to be less sensitive to changes in α and β than the F‐P framework, and, therefore, is more robust and desirable from a management standpoint. Key Points: Quantifying uncertainty in sediment sourcing is important for watershed management The enhanced Bayesian framework has key parameters that adequately quantify uncertainty Key stochastic model parameters capture spatiotemporal variability in erosion processes
 intensively managed landscapes sediment sourcing unmixing model uncertainty analyses fingerprinting Bayesian

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