Downstream effects of impounding a natural lake: the Snake River downstream from Jackson Lake Dam, Wyoming, USA

Auteur(s) et Affiliation(s)



Description :
Calibration of the transport relations was based on bed load transport data collected over a wide range of flows on the Snake River and its 2 major tributaries within the study area in 2006 and 2007. Comparison of actual flows with unregulated flows for the period since 1957 shows that operations of Jackson Lake Dam (JLD) have reduced annual peak flows and increased late summer flows. Painted tracer stones placed at 5 locations during the 2005 spring flood demonstrate that despite the reduction in flood magnitudes, common floods are capable of mobilizing the bed material. Calculations suggest that the Snake River was not in equilibrium before construction of JLD, but was naturally in sediment deficit. This result highlights the value of transport data and calculation of sediment mass balance in informing dam operations.


Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 2011, vol. 36, n°. 11, p. 1421-1434, nombre de pages : 14, Références bibliographiques : 1 p.

Date :
2011

Editeur :
Pays édition : Royaume-Uni, Chichester, Wiley