An updated version of BAGS may be downloaded from here (File Size: 748 K)
Frequently Asked Questions for BAGS
BAGS is a spreadsheet-based program that predicts bed load transport using six well-known bed load transport equations developed specifically for gravel-bed rivers. Sediment transport estimates are calculated on the basis of field measurements of channel geometry, reach-average slope, and bed material grain size. Field data and other relevant input parameters are entered into the program sequentially through a series of prompts to the user. Calculations are carried out using Visual Basic for Applications and the output is stored on individual spreadsheets.
Pitlick, John; Cui, Yantao; Wilcock, Peter. 2009. Manual for computing bed load transport using BAGS (Bedload Assessment for Gravel-bed Streams) Software. Gen. Tech. Rep. RMRS-GTR-223. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. 45 p.
(PDF File Size: 2.10 MB)
The user manual provides step-by-step instructions for operating BAGS along with explanations of the rationale behind individual steps or model calculations. In addition to the step-by-step instructions, the BAGS manual describes in detail the individual bed load transport equations used in the BAGS model, provides guidance on interpreting the results from the model output, discusses possible strategies for evaluating the reasonableness of model results, and presents several examples from different studies illustrating how and why bed load modeling results can differ from field measurements.
Sediment Transfer Primer
Wilcock, Peter; Pitlick, John; Cui, Yantao. 2009. Sediment transport primer: estimating bed-material transport in gravel-bed rivers. Gen. Tech. Rep. RMRS-GTR-226. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. 78 p.
(PDF File Size: 1.44 MB)
This document provides background information on sediment transport dynamics and is a supplement to BAGS so that the user can more effectively apply the model and interpret the bed load transport estimates. Additionally, the document provides information to help the user of BAGS define relevant and proper sediment transport problems, select appropriate model input data, interpret and apply the model output results in a useful and reliable fashion, and examine sources of error.