Measuring and modeling gravel transport at Caspar Creek, CA, to detect changes in sediment supply, storage, and transport efficiencyAuthor(s): P. W. Richardson; J. W. Wagenbrenner; D. G. Sutherland; T. E. Lisle
Source: Water Resources Research. 56(6): e2019WR026389
Publication Series: Scientific Journal (JRNL)
Station: Pacific Southwest Research Station
Download Publication (8.0 MB)
We developed a technique for reconstructing annual gravel yields and generated a 55‐year record of gravel transport for the North Fork catchment of the Caspar Creek Experimental Watersheds in Northern California. The technique relies on field data collection including annual surveys of weir pond volumes and suspended sediment measurements, as well as an accounting for settling of suspended sediment and organic matter in the pond. We compared these annual yields to gravel yields predicted by the Wilcock two‐fraction bed load transport model, which we calibrated from measured values at Caspar Creek. We considered three velocity‐discharge relationships and found that values of hydraulic variables measured during storms produced the best fit between reconstructed and predicted annual gravel yields when years with large disturbances were excluded. We also compared predicted gravel transport rates to bed load transport rates measured from 1988 to 1995 with bed load pit samplers. We found that the calibrated model predictions agreed well with the field‐measured bed load transport rates. To investigate the role of supply and storage on gravel transport, we compared the reconstructed gravel yields to predicted gravel yields and found that increased occurrence of landslides and headcut erosion in the 1990s and early 2000s did not lead to an increase in gravel yields. Instead, input of large downed wood in the 1990s created storage space and decreased bed load delivery to the weir pond.
- You may send email to email@example.com to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationRichardson, P. W.; Wagenbrenner, J. W.; Sutherland, D. G.; Lisle, T. E. 2020. Measuring and modeling gravel transport at Caspar Creek, CA, to detect changes in sediment supply, storage, and transport efficiency. Water Resources Research. 56(6): e2019WR026389. https://doi.org/10.1029/2019WR026389.
KeywordsBed load transport, disturbance response, experimental watershed, monitoring
- Evaluating the impacts of logging activities on erosion and suspended sediment transport in the Caspar Creek watersheds
- Assessing the applicability of the Wilcock 2-fraction bedload transport model at the Caspar Creek Experimental Watersheds, CA
- A coupled upland-erosion and instream hydrodynamic-sediment transport model for evaluating sediment transport in forested watersheds
XML: View XML