Impacts of Vegetative Practices on Suspended Sediment from Watersheds of Arizona
Publication: Journal of Water Resources Planning and Management
Volume 127, Issue 1
Abstract
Effects of vegetative practices on suspended sediment discharge from ponderosa pine forests and -juniper woodlands in north-central Arizona are examined. Sediment-rating curves were developed to analyze the impacts. Disturbance from vegetative practices generally increased suspended sediment transport above those of control (reference) watersheds. Completely cleared and strip-cut ponderosa pine watersheds produced higher sediment concentrations than did a control watershed. Likewise, cabled and herbicide-treated -juniper watersheds yielded higher sediment-laden streamflows than did a control. Sediment transport regimes are also related to streamflow-generation mechanisms and hydrograph stages. Although about 85% of the data analyzed represented snowmelt-runoff events in both vegetative types, derivation of sediment-rating curves based on streamflow-generation mechanisms improved the sensitivity of the analysis. Sediment data collected during rising and falling hydrograph stages varied between the two vegetative types. Sediment concentrations were generally higher in the rising stage than in the falling stage for ponderosa pine watersheds. There was no clear evidence of higher sediment concentrations in the rising stage of the hydrograph as compared to the falling stage in the -juniper watersheds.
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Information & Authors
Information
Published In
Journal of Water Resources Planning and Management
Volume 127 • Issue 1 • February 2001
Pages: 41 - 47
History
Received: Apr 5, 1999
Published online: Feb 1, 2001
Published in print: Feb 2001
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