Skip to Main Content
Modeling the effects of pulsed versus chronic sand inputs on salmonid spawning habitat in a low-gradient gravel-bed riverAuthor(s): Oscar Maturana; Daniele Tonina; James A. McKean; John M. Buffington; Charles H. Luce; Diego Caamano
Source: Earth Surface Processes and Landforms. doi: 10.1002/esp.3491
Publication Series: Scientific Journal (JRNL)
Station: Rocky Mountain Research Station
Download Publication (758.44 KB)
DescriptionIt is widely recognized that high supplies of fine sediment, largely sand, can negatively impact the aquatic habitat quality of gravel-bed rivers, but effects of the style of input (chronic vs. pulsed) have not been examined quantitatively. We hypothesize that a continuous (i.e. chronic) supply of sand will be more detrimental to the quality of aquatic habitat than an instantaneous sand pulse equal to the integrated volume of the chronic supply. We investigate this issue by applying a two-dimensional numerical model to a 1 km long reach of prime salmonid spawning habitat in central Idaho. Results show that in both supply scenarios, sand moves through the study reach as bed load, and that both the movement and depth of sand on the streambed mirrors the hydrograph of this snowmelt-dominated river. Predictions indicate greater and more persistent mortality of salmonid embryos under chronic supplies than pulse inputs, supporting our hypothesis. However, predicted mortality varies both with salmonid species and location of spawning.We found that the greatest impacts occur closer to the location of the sand input under both supply scenarios. Results also suggest that reach-scale morphology may modulate the impact of sand loads, and that under conditions of high sand loading climaterelated increases in flow magnitude could increase embryo mortality through sand deposition, rather than streambed scour.
- You may send email to firstname.lastname@example.org 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.
CitationMaturana, Oscar; Tonina, Daniele; McKean, James A.; Buffington, John M.; Luce, Charles H.; Caamano, Diego. 2013. Modeling the effects of pulsed versus chronic sand inputs on salmonid spawning habitat in a low-gradient gravel-bed river. Earth Surface Processes and Landforms. doi: 10.1002/esp.3491
Keywordssediment transport, pulsed and chronic sand supply, aquatic habitat, river morphology, gravel-bed rivers
- Spatial distribution of impacts to channel bed mobility due to flow regulation, Kootenai River, USA
- A simulation model for the infiltration of heterogeneous sediment into a stream bed
- Dynamic flow modeling of riverine amphibian habitat with application to regulated flow management
XML: View XML