|Roger Kuhnle Additional Information|
MS, Geological Sciences, 1981, University of Illinois at Chicago, Chicago, Illinois, USA
PhD, Geology, 1986, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
Transport mechanics and bed surface dynamics of mixed sand-and-gravel bed rivers
Erosion and transport of sand over immobile gravel beds
Tracking sources of sediment delivered to channels in watersheds
Sediment transport of sediment under unsteady flows
Kuhnle, R. A., Wren, D. G., Hilldale, R. C., Goodwiller, B. T., Carpenter, W. O., Laboratory calibration of impact plates for measuring gravel bed load size and mass. Journal of Hydraulic Engineering 143(12), 06017023, doi: 10.1061/(ASCE)HY.1943-7900.0001391, 2017.
Momm, H. G., Bingner, R. L., Emillaire, R., Garbrecht, J., Wells, R. R., Kuhnle, R. A., Automated watershed subdivision for simulations using multi-objective optimization. Hydrological Sciences Journal doi: 10.1080/02626667.2017.1346794, 2017.
Kuhnle, R. A., Langendoen, E. J., Wren, D. G., Prediction of sand transport over immobile gravel from supply limited to capacity conditions. Journal of Hydraulic Engineering, 143(7), doi: 10.1061/(ASCE)HY.1943-7900.0001292, 2017.
Wren, D. G., Ursic, M. E., Kuhnle, R. A., Langendoen, E. J., Examining the generality of t0/TKE for gravel and cobble beds with sand fill. Journal of Hydraulic Engineering, 06016028-6, 2016.
Kuhnle, R. A. Wren, D. G., Langendoen, E. J., Erosion of sand from a gravel bed. Journal of Hydraulic Engineering 142(2), 04015052 doi: 10.1061/(ASCE)HY.1943-7900.0001071, 2016.
Selected Research Projects and Activities:
Studies of Bed Surface Roughness: Recently it has been determined that the roughness of the bed surface rather along with information on the size distribution of the grains on the surface of gravel-bed stream are important information needed to predict flow depth and sediment transport rate for a given flow discharge. The relation of the surface roughness to the grain size distribution of the bed material is currently poorly understood. Experiments on studying the evolution of the bed surface with changing conditions are ongoing.
Surrogate Methods to Measure Transport of Gravel in Streams: Investigations in the field and laboratory have been undertaken to develop methods to use sediment generated noise (SGN) and impact plates to measure the rate of transport of gravels in stream and river channels. Progress has been made in developing these two techniques and measurements have been made on Walnut Gulch Watershed in Arizona and the Elwha River in the state of Washington.
Federal Interagency Sedimentation Project – Technical Committee: Represents ARS on the Federal Interagency Sedimentation Project – Technical Committee (FISP-TC), which is composed of representatives from U.S.D.A. Agricultural Research Service, U.S. Army Corps of Engineers, U.S. Bureau of Reclamation, U.S. Forest Service, U.S. Geological Survey. In addition to development, quality assurance, sales, and support of physical samplers, the FISP conducts and sponsors research on emerging tools and technologies for measurement and analysis of sediment properties.