TY - GEN

T1 - Sediment source fingerprinting

T2 - Sediment Dynamics in Changing Environments - 2008 Symposium of the International Commission on Continental Erosion, ICCE

AU - Minella, Jean P.G.

AU - Clarke, Robin T.

AU - Merten, Gustavo H.

AU - Walling, Des E.

PY - 2008/12/1

Y1 - 2008/12/1

N2 - Techniques involving composite fingerprints and multivariate mixing models are being increasingly used in catchment studies to establish the relative contributions of potential sources to the suspended sediment output. Such information is important both for understanding the fine sediment dynamics of a catchment and for targeting remediation measures required to reduce sediment-related environmental problems. A multivariate mixing model algorithm, which compares the concentrations of a range of geochemical properties of the suspended sediment load with those of a number s of potential sources, is commonly used to provide estimates of the relative contributions (P1, P2, ⋯, Ps) of those sources to the suspended sediment load. However, such models do not provide measures of the uncertainty associated with the P-values. This paper describes how the usual mixing model can be modified, such that the optimization procedure used to estimate the sediment proportions P1 P2⋯ contributed by different sources also provides measures of their uncertainty. This approach allows hypotheses concerning the P values to be tested, such as: (i) whether the individual P-values differ significantly from zero, and (ii) whether the P-values change significantly between events. To calculate the uncertainty associated with a P-value, a statistical model which considers the correlation between the tracer variables is used. This approach has been tested using data from a small rural catchment in southern Brazil where a sediment source investigation is in progress. Sediment samples collected during 48 storm events were used to establish the source contributions.

AB - Techniques involving composite fingerprints and multivariate mixing models are being increasingly used in catchment studies to establish the relative contributions of potential sources to the suspended sediment output. Such information is important both for understanding the fine sediment dynamics of a catchment and for targeting remediation measures required to reduce sediment-related environmental problems. A multivariate mixing model algorithm, which compares the concentrations of a range of geochemical properties of the suspended sediment load with those of a number s of potential sources, is commonly used to provide estimates of the relative contributions (P1, P2, ⋯, Ps) of those sources to the suspended sediment load. However, such models do not provide measures of the uncertainty associated with the P-values. This paper describes how the usual mixing model can be modified, such that the optimization procedure used to estimate the sediment proportions P1 P2⋯ contributed by different sources also provides measures of their uncertainty. This approach allows hypotheses concerning the P values to be tested, such as: (i) whether the individual P-values differ significantly from zero, and (ii) whether the P-values change significantly between events. To calculate the uncertainty associated with a P-value, a statistical model which considers the correlation between the tracer variables is used. This approach has been tested using data from a small rural catchment in southern Brazil where a sediment source investigation is in progress. Sediment samples collected during 48 storm events were used to establish the source contributions.

KW - Brazil

KW - Multivariate mixing model

KW - Optimization

KW - Soil management

KW - Source fingerprinting technique

KW - Suspended sediment

KW - Uncertainty analysis

UR - http://www.scopus.com/inward/record.url?scp=62749183724&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=62749183724&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:62749183724

SN - 9781901502848

T3 - IAHS-AISH Publication

SP - 31

EP - 37

BT - Sediment Dynamics in Changing Environments

Y2 - 1 December 2008 through 5 December 2008

ER -