Sediment debris basins are established within the Andrews Experimental Forest as part of paired watershed experiments examining differences in streamflow and nutrient chemistry due to timber harvest. Basins are constructed below the stream gaging station in each of five basins, and these basins and the deposits of sediment within them are re-surveyed or emptied annually to measure bedload sediment production. Basins are measured on Watersheds 1, 2 (control) and 3 beginning with wateryear 1957 and on Watersheds 9 (control) and 10 beginning wateryear 1974. Data collection is ongoing at an annual time step. Data provided include the watershed name, wateryear, survey method, watershed area, annual bedload volume and accumulation rate. These data display both the chronic production of sediment, as well as pulsed, episodic bedload from landslides within the contributing basins.
Alfred B. Levno, C. Ted Dyrness, Craig Creel, Donald L. Henshaw, Frederick J. Swanson, Gordon E. Grant, Greg Downing, Jack S. Rothacher, Julia A. Jones, Richard L. Fredriksen, Sherri L. Johnson
Forest disturbance, including timber harvest and natural disturbances, influence the rate and timing of exports from headwater basins, including dissolved, suspended, and bedload. Bedload is the material that is bounced or dragged along the base of the channel, and ranges from gravel to boulder size. The objective of this study is to quantify the effect of road construction, timber harvest and post-harvest burning on bedload production from small headwater basins. The study design (before/after, control/impacted) is intended to dsplay the effects of anthropogenic disturbance on bedload sediment production over multiple decades.