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Journal of Hydrology
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Suspended-sediment and dissolved-solid (salt) loads decreased after the early 1940s in the Colorado Plateau portion of the Colorado River basin, although discharge of major rivers ? the Colorado, Green and San Juan ? did not change significantly. This decline followed a period of high sediment yield caused by arroyo cutting. Reduced sediment loads have previously been explained by a change in sediment sampling procedures or changes in climate, land-use and conservation practices. More recent work has revealed that both decreased sediment production and sediment storage in channels of tributary basins produced the decline of sediment and salt loads. Sediment production and sediment storage are important components...
Many water agencies in California and the rest of the United States utilize sequences of wrapped historic hydrology rather than synthetic streamflows in their simulation models. The wrapped historic procedure is also known as the index-sequential method. This paper compares results from an annual regulation model of the Colorado River system which used both historic hydrologic sequences generated by the index-sequential method, and autoregressive, order 1 (AR(1)) synthetically generated streamflows as inputs. The synthetic AR(1) log normal model also included parameter uncertainty. Reservoir storage exceedance probabilities developed for Lake Powell and Lake Mead from a 32-year simulation show that AR(1) model generated...
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