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Articles 1 - 3 of 3
Full-Text Articles in Bioresource and Agricultural Engineering
Monitoring Subsurface Drainage Flow At Remote Locations, Stephen R. Workman, Stephen F. Higgins, Scott A. Shearer
Monitoring Subsurface Drainage Flow At Remote Locations, Stephen R. Workman, Stephen F. Higgins, Scott A. Shearer
Biosystems and Agricultural Engineering Faculty Publications
Laboratory evaluations and field results are presented for a slotted weir used to measure discharge from subsurface drains. The head–discharge curve for the vertical slot is a simple power function with an exponent of 1.5. There was excellent agreement (r2 > 0.99 and 1:1 slope) between predicted and observed discharge in laboratory testing of 12 test weirs representing five slot widths. The primary advantages of the vertical slot weir are its simplicity, ease of maintenance, and ability to measure small flow rates. Disadvantages include a tendency for the slot to close a small amount over time as a result of …
Determining Matric Stress With The Modified Cam Clay Energy Relationship, Richard A. Rohlf, Larry G. Wells
Determining Matric Stress With The Modified Cam Clay Energy Relationship, Richard A. Rohlf, Larry G. Wells
Biosystems and Agricultural Engineering Faculty Publications
The stress generated by matric suction, or matric stress, was determined at points along the stress path with an analytical and experimental procedure based on the modified Cam clay energy relationship. Matric stress was found to be approximately constant at large strain for constant water content triaxial compression tests. Matric stress was included in both shear and volume relationships in a critical–state soil model that employed the modified Cam clay yield function. Shear was modeled with a constant matric stress. Slope of the normal compression and recompression lines was adjusted for matric stress using a state function that expressed matric …
Comparing Size In Lime, Mark Whitten
Comparing Size In Lime, Mark Whitten
Journal of the Department of Agriculture, Western Australia, Series 4
Extensive research into the management of soil acidity in Western Australia is increasing farmer awareness that lime use can reduce soil acidity and improve crop yields. However, as lime use increases, the question of lime performance and particle size is becoming more critical. Chris Gazey from the Department of Agriculture is heading up the soil acidity project, with the team comprising members from the department, CSIRO and the University of Western Australia. Mark Whitten reports on project outcomes relating to lime particle size.