Page Banner

United States Department of Agriculture

Agricultural Research Service

DANIEL G.. WREN

Research Hydraulic Engineer


Publications (Clicking on the reprint icon Reprint Icon will take you to the publication reprint.)
Acoustic measurement of suspensions of clay and silt particles using single frequency attenuation and backscatter - (Peer Reviewed Journal)
Carpenter, W.O., Goodwiller, B.T., Chambers, J.P., Wren, D.G., Kuhnle, R.A. 2014. Acoustic measurement of suspensions of clay and silt particles using single frequency attenuation and backscatter. Applied Acoustics. 85:123-129.
Velocity field measurements in tailings dam failure experiments using a combined PIV-PTV approach - (Proceedings) - (04-Feb-14)
Predicting bed load transport of sand and gravel on Goodwin Creek - (Peer Reviewed Journal)
Kuhnle, R.A., Wren, D.G., Langendoen, E.J. 2014. Predicting bed load transport of sand and gravel on Goodwin Creek. Journal of Hydro-environment Research. 8(2):153-163.
A note on acoustic measurements of turbulence, suspended sediment, and bed forms in mobile bed experiments Reprint Icon - (Peer Reviewed Journal)
Wren, D.G., Langendoen, E.J., Kuhnle, R.A. 2014. A note on acoustic measurements of turbulence, suspended sediment, and bed forms in mobile bed experiments. Journal of Hydro-environment Research. 8:(2)164-173.
Turbulent flow and sand transport over a cobble bed - (Peer Reviewed Journal)
Wren, D.G., Kuhnle, R.A., Langendoen, E.J., Rigby Jr, J.R. 2014. Turbulent flow and sand transport over a cobble bed. Journal of Hydraulic Engineering. 140(4), doi:04014001. 2014.
Turbulence structure and sand transport over gravel and cobble beds in laboratory flumes - (Book / Chapter)
Wren, D.G., Kuhnle, R.A., Langendoen, E.J., Pellachini, C. 2013. Turbulence structure and sand transport over gravel and cobble beds in laboratory flumes. In: Venditti, J. G., Best, J. L., Church, M., and Hardy, R. J. Coherent Flow Structures at Earth's Surface. Chichester, UK. John Wiley & Sons, Ltd, p. 341-357.
Laboratory and field investigations of marsh edge erosion - (Book / Chapter)
Chen, Q., Ozeren, Y., Zhang, G., Wren, D., Wu, W., Jadhav, R., Parker, K., and Pant, H. Laboratory and field investigations of marsh edge erosion. Chapter in: Sediment Transport: Monitoring, Modeling and Management (pp. 311-337). Nova Science Publishers, Inc. Editors: Abdul, K. and Wu, W.
Experimental investigation of wave attenuation through model and live vegetation - (Peer Reviewed Journal) - (20-Jan-13)
Effects of silt loading on turbulence and sand transport - (Peer Reviewed Journal)
Wren, D.G., Kuhnle, R.A. 2012. Effects of silt loading on turbulence and sand transport. International Journal of Sediment Research. 27(4):451-459.
Phase II Report for SERRI Project No. 80037: Investigation of surge and wave reduction by vegetation (Phase II) - (Other)
Wu, W., Ozeren, Y., Wren, D.G., Chen, Q., Zhang, G., Holland, M., Marsooli, R., Lin, Q., Jadhave, R., Parker, K., Pant, H., Bouanchaud, J., Chen, Y. 2012. Phase II Report for SERRI Project No. 80037: Investigation of surge and wave reduction by vegetation (Phase II). Government Publication/Report. SERRI Report No. 80037-02:1-397.
Observations on the use of acoustic Doppler velocimeters over rough beds with suspended sediment - (Proceedings)
Wren, D.G., Langendoen, E.J., Kuhnle, R.A., Pellachini, C. 2012. Observations on the use of acoustic Doppler velocimeters over rough beds with suspended sediment. Hydraulic Measurements and Experimental Methods Conference, Snowbird, Utah. 7 pp. CD-ROM.
Water surface capturing by image processing - (Proceedings)
Ozeren, Y., and Wren, D. G. Water surface capturing by image processing. Hydraulic Measurements and Experimental Methods Conference, Snowbird, Utah. 6 pp. 2012. CD-ROM.
Comparison and assessment of four sediment particle-size analysis methodologies - (Proceedings)
Rigby, J. R. and Wren, D. G. Comparison and assessment of four sediment particle-size analysis methodologies. Hydraulic Measurements and Experimental Methods Conference, Snowbird, Utah. 5 pp. 2012. CD-ROM.
Performance assessment and calibration of a profiling lab-scale acoustic Doppler velocimeter for application over mixed sand-gravel beds - (Proceedings)
Ursic, M., Langendoen, E. J., Wren, D. G., Kuhnle, R. A., and Pellachini, C. Performance assessment and calibration of a profiling lab-scale acoustic Doppler velocimeter for application over mixed sand-gravel beds. Hydraulic Measurements and Experimental Methods Conference, Snowbird, Utah. 6 pp. 2012. CD-ROM.
Using terrestrial LIDAR to characterize morphology and texture of a sand and gravel bed in a laboratory flume - (Proceedings)
Ursic, M., Langendoen, E. J., Momm, H., Wren, D. G., and Kuhnle, R. A. Using terrestrial LIDAR to characterize morphology and texture of a sand and gravel bed in a laboratory flume. Hydraulic Measurements and Experimental Methods Conference, Snowbird, Utah. 6 pp. 2012. CD-ROM.
Sand transport over an immobile gravel substrate - (Peer Reviewed Journal)
Kuhnle, R.A., Wren, D.G., Langendoen, E.J., Rigby Jr, J.R. 2013. Sand transport over an immobile gravel substrate. Journal of Hydraulic Engineering. 139(2):167-176.
Analysis of vegetation effect on waves using a vertical 2-D RANS model - (Peer Reviewed Journal)
Wu, W., Zhang, M., Ozeren, Y., Wren, D.G. 2013. Analysis of vegetation effect on waves using a vertical 2-D RANS model. Journal of Coastal Research. 29(2):383-397.
Laboratory measurements of wave attenuation through model and live vegetation - (Book / Chapter)
Ozeren, Y. and Wren, D. G. Laboratory measurements of wave attenuation through model and live vegetation. In: Coastal Hazards (pp. 45–56). American Society of Civil Engineers. doi:10.1061/9780784412664.005. 2013.
Using lake sedimentation rates to quantify the effectiveness of erosion control in watersheds - (Peer Reviewed Journal)
Wren, D.G., Davidson, G.R. 2011. Using lake sedimentation rates to quantify the effectiveness of erosion control in watersheds. Journal of Soil and Water Conservation. 66(5):313-322. doi.10.1029/2010JF001859.2011.
Assessing sedimentation issues within aging of flood-control reservoirs - (Book / Chapter)
Bennett, S.J., Dunbar, J.A., Rhoton, F.E., Allen, P.M., Bigham, J.M., Davidson, G.R., Wren, D.G. 2013. Assessing sedimentation issues within aging of flood-control reservoirs. Book Chapter. 21:25-44 doi:10.1130/2013.4121(03).
Phase I Report for SERRI Project No. 80037: Investigation of surge and wave reduction by vegetation - (Other)
Wu, W., Ozeren, Y., Wren, D.G., Chen, Q., Zhang, G., Holland, M., Ding, Y., Kuiry, S.N., Zhang, M., Jadhave, R., Chatagnier, J., Chen, Y., Gordji, L. 2011. Phase I Report for SERRI Project No. 80037: Investigation of surge and wave reduction by vegetation. Laboratory Publication. 1:315.
Experimental Investigation of Cylindrical Floating Breakwater Performance with different mooring configurations - (Peer Reviewed Journal)
Ozeren, Y., Wren, D.G., Altinakar, M., Work, P.A. 2011. Experimental investigation of cylindrical floating breakwater performance with different mooring configurations. Journal of Waterway, Port, Coastal and Ocean Engineering. doi:10.1061/(ASCE)WW.1943-5460.0000090.
Effects of sand addition on turbulent flow over an immobile gravel bed - (Peer Reviewed Journal)
Wren, D.G., Langendoen, E.J., Kuhnle, R.A. 2011. Effects of sand addition on turbulent flow over an immobile gravel bed. Journal of Geophysical Research. 116 doi:10.1029/2010JF001859.
Connectivity and variability: metrics for riverine floodplain backwater rehabilitation - (Book / Chapter)
Shields Jr, F.D., Knight, S.S., Lizotte Jr, R.E., Wren, D.G. 2011. Connectivity and variability: metrics for riverine floodplain backwater rehabilitation. In: Simon, A., Bennett, S., Castro, J., and Thorne, C. R. (eds.), The Scientific Basis for Stream Restoration in Dynamic Fluvial Systems: Deterministic Approaches, Analyses and Tools. American Geophysical Union. 2010, Geophysical Monograph Series 194, pp. 233-246, DOI:10.1029/2010GM000985.
Sand Transport, Flow Turbulence, and Bed Forms over an Immobile Gravel Bed - (Proceedings)
Kuhnle, R.A., Wren, D.G., Langendoen, E.J. 2010. Sand Transport, Flow Turbulence, and Bed Forms over an Immobile Gravel Bed. 11th International Symposium on River Sedimentation, Stellenbosch, South Africa, 6-9 September, 2010. CD (Conference Proceedings)
An Experimental Study of Sand Transport over an Immobile Gravel Substrate - (Proceedings)
Kuhnle, R.A., Wren, D.G., Langendoen, E.J. 2010. An Experimental Study of Sand Transport over an Immobile Gravel Substrate. 2nd Joint Federal Interagency Sedimentation Conference, Las Vegas, NV, June 27-July 1, 2010. CD (Conference Proceedings)
Floodplain Backwater Restoration: A Case Study - (Proceedings)
Shields Jr, F.D., Knight, S.S., Lizotte Jr, R.E., Bryant, C.T., Wren, D.G. 2010. Floodplain backwater restoration: A case study. Proceedings, 9th Federal Interagency Sedimentation Conference, Joint Federal Interagency Conference Organizing Committee, Washington, D.C., CD-ROM.
Effects of Local Immobile Gravel Bed Elevation on Turbulence - (Proceedings)
Wren, D.G., Langendoen, E.J., Kuhnle, R.A. 2010. Effects of Local Immobile Gravel Bed Elevation on Turbulence. Federal Interagency Sedimentation Conference Proceedings. CD Conference Proceedings.
Acoustic Measurement of Suspended Fine Particle Concentrations by Attenuation - (Government Publication)
Carpenter, W.O., Chambers, J.P., Wren, D.G., Kuhnle, R.A., Diers, J.A. 2009. Acoustic Measurement of Suspended Fine Particle Concentrations by Attenuation. USDA ARS national Sedimentation Laboratory Research Report No. 67, 62 p. (Funded research project completion report)
Acoustic measurements of clay-size particles - (Peer Reviewed Journal)
Carpenter, W.O., Chambers, J.P., Wren, D.G., Kuhnle, R.A., Diers, J.A. 2009. Acoustic measurements of clay-size particles. Journal of the Acoustical Society of America. 126(6):190-195.
Reservoir sedimentation research at the National Sedimentation Laboratory - (Proceedings)
Wren, D.G., Davidson, G.R., Bennett, S.J., Hickey, C. 2009. Reservoir sedimentation research at the National Sedimentation Laboratory. National Sedimentaton Laboratory (NSL)- 50 Years of Soil & Water Research in a Changing Agricultural Environment. 113-133.
Experimental and Numerical Investigations of Floating Breakwater Performance. - (Government Publication)
Ozeren, Y., Wren, D.G., Alonso, C.V. 2009. Experimental and Numerical Investigations of Floating Breakwater Performance. Laboratory Publication. #65
Flow and sand transport over an immobile gravel bed. - (Proceedings)
Wren, D.G., Langendoen, E.J., Kuhnle, R.A. 2009. Flow and sand transport over an immobile gravel bed. Congress of International Association for Hydraulic Research Proceedings. 8 pages. August 9-14/2009.
Predicting wind-driven waves in small reservoirs - (Peer Reviewed Journal)
Ozeren, Y., Wren, D.G. 2009. Predicting wind-driven waves in small reservoirs. Transactions of the ASABE. 52(4):1213-1221.
Measurement and prediction of the size of suspended sediment over dunes - (Proceedings)
Kuhnle, R.A., Wren, D.G. 2009. Measurement and prediction of the size of suspended sediment over dunes. Proceedings of the 33rd International Association of Hydrdaulic Research Congress. Water Engineering for a Sustainable Environment. Vancouver, British Columbia, Canada, 8 pp. August 9-14, 2009 (Peer-Reviewed Conference Proceedings
Size of Suspended Sediment over Dunes - (Peer Reviewed Journal)
Kuhnle, R.A., Wren, D.G. 2009. Size of Suspended Sediment over Dunes. Journal of Geophysical Research. 114, F02020, doi:10.1029/2008JF001200
Towards a Basis for Designing Backwater and Side Channel Restorations - (Proceedings)
Shields Jr, F.D., Knight, S.S., Stofleth, J.M., Wren, D.G. 2009. Towards a Basis for Designing Backwater and Side Channel Restorations. Water Engineering for a Sustainable Environment, Proceedings, International Association for Hydraulic Research 33rd Congress, IAHR, Madrid, CD-ROM.
Measurements of Coupled Fluid and Sediment Motion Over Mobile Sand Dunes in a Laboratory Flume - (Peer Reviewed Journal)
Wren, D.G., Kuhnle, R.A. 2008. Measurements of Coupled Fluid and Sediment Motion Over Mobile Sand Dunes in a Laboratory Flume. International Journal of Sediment Research. Vol. 23 (4) pp.329-337.
Development of Floating Wave Barriers for Cost Effective Protection of Irrigation Pond Levees - (Peer Reviewed Journal)
Ozeren, Y., Wren, D.G., Alonso, C.V. 2008. Development of Floating Wave Barriers for Cost Effective Protection of Irrigation Pond Levees. Transactions of the ASABE. 51(5): 1599-1612.
Experimental sediment transport research at the USDA National Sedimentation Laboratory - (Proceedings)
Kuhnle, R.A., Wren, D.G., Alonso, C.V. 2008. Experimental sediment transport research at the USDA National Sedimentation Laboratory. National Sedimentaton Laboratory (NSL)- 50 Years of Soil & Water Research in a Changing Agricultural Environment. p. 45-65.
Practical Implications of Quantifying Ancient Sedimentation Rates in Lakes - (Peer Reviewed Journal)
Wren, D.G., Davidson, G.R. 2008. Practical Implications of Quantifying Ancient Sedimentation Rates in Lakes. Journal of Soil and Water Conservation. 63(3): 89A.
The Evolution of an Oxbow Lake in the Mississippi Alluvial Floodplain - (Peer Reviewed Journal)
Wren, D.G., Davidson, G.R., Walker, W.G., Galicki, S.J. 2008. The Evolution of an Oxbow Lake in the Mississippi Alluvial Floodplain. Journal of Soil and Water Conservation. 6(3): 129-135.
Size of Suspended Sediment Over Dunes - (Proceedings)
Kuhnle, R.A., Wren, D.G. 2007. Size of Suspended Sediment Over Dunes. In: Proceedings of Hydraulic Measurements and Experimental Methods Conference, Lake Placid, NY, p. 274-279.
Time Scales in Turbulence and Sediment Concentration Over Mobile Sand Dunes - (Proceedings)
Wren, D.G., Kuhnle, R.A. 2007. Time Scales in Turbulence and Sediment Concentration Over Mobile Sand Dunes. Environmental and Water Resources Institute World Congress Proceedings. 6 pp. 2007. CD-ROM
Accurate lacustrine and wetland sediment accumulation rates determined from 14c activity of bulk sediment fractions - (Peer Reviewed Journal)
Walker, W.G., Davidson, G.R., Lange, T., Wren, D.G. 2007. Accurate lacustrine and wetland sediment accumulation rates determined from 14c activity of bulk sediment fractions. Radiocarbon. 49(2):983-992.
Measurements of the relationship between turbulence and sediment in suspension over mobile sand dunes in a laboratory flume - (Peer Reviewed Journal)
Wren, D.G., Kuhnle, R.A., Wilson, C. 2007. Measurements of the relationship between turbulence and sediment in suspension over mobile sand dunes in a laboratory flume. Journal of Geophysical Research. 112:F03009, doi:10.1029/2006JF000683.
Prediction of the Grain Size of Suspended Sediment: Implications for Calculating Suspended Sediment Concentrations Using Single Frequency Acoustic Backscatter - (Peer Reviewed Journal)
Kuhnle, R.A., Wren, D.G., Chambers, J.P. 2007. Prediction of the grain size of suspended sediment: implications for calculating suspended sediment concentrations using single frequency acoustic backscatter. International Journal of Sediment Research, 22(1): 1-15.
Sedimentation in three small erosion control reservoirs in northern Mississippi - (Peer Reviewed Journal)
Wren, D.G., Wells, R.R., Wilson, C.G., Cooper, C.M., Smith Jr, S. 2007. Sedimentation in three small erosion control reservoirs in northern Mississippi. Journal of Soil and Water Quality. 62(3): 137-144.
Closure to discussion of “Distributions of velocity, turbulence, and suspended sediment over low-relief antidunes" by Wu, P. and Jin, Y.C. - (Peer Reviewed Journal)
Wren, D.G., Bennett, S.J., Barkdoll, B.D., Kuhnle, R.A. 2006. Closure to discussion of “Distributions of velocity, turbulence, and suspended sediment over low-relief antidunes" by Wu, P. and Jin, Y.C. Journal of Hydraulic Research IAHR. 44(5):718-720.
Practical guidance for discharge and water quality data collection on small watersheds - (Peer Reviewed Journal)
Harmel, R.D., King, K.W., Haggard, B.E., Wren, D.G., Sheridan, J.M. 2006. Practical guidance for discharge and water quality data collection on small watersheds. Transactions of the ASABE. 49(4):937-948.
Sedimentation in Three Small Erosion Control Reservoirs in North Mississippi - (Proceedings)
Wren, D.G., Wells, R.R., Wilson, C.G., Cooper, C.M., Leary, D., Hickey, C.J. 2006. Sedimentation in three small erosion control reservoirs in north Mississippi. In: Proceedings of the 8th Federal Interagency Sedimentation Conference, April 2-6, 2006, Reno, Nevada. CDROM.
Estimation of Particle Sizes for a Range of Narrow Size Distributions of Natural and Suspended in Water Using Multifrequency Acoustic Backscatter - (Proceedings)
Smith, C.K., Wren, D.G., Chambers, J.P. 2006. Estimation of particle sizes for a range of narrow size distributions of natural and suspended in water using multifrequency acoustic backscatter. In: Proceedings of the 8th Federal Interagency Sedimentation Conference, April 2-6, 2006, Reno, Nevada. CDROM.
Development of An Acoustic Suspended Sediment Monitoring System - (Proceedings)
Kleinert, D.E., Wren, D.G., Smith, C.K., Chambers, J.P. 2006. Development of an acoustic suspended sediment monitoring system. In: Proceedings of the 8th Federal Interagency Sedimentation Conference, April 2-6, 2006, Reno, Nevada. CDROM.
Acoustic Profiling of Sediment Accumulation in Three Small Erosion Control Reservoirs in North Mississippi - (Proceedings)
Leary, D., Hickey, C.J., Wren, D.G. 2006. Acoustic profiling of sediment accumulation in three small erosion control reservoirs in north Mississippi. In: Proceedings of the 8th Federal Interagency Sedimentation Conference, April 2-6, 2006, Reno, Nevada. CDROM.
Prediction of the Grain Size of Suspended Sediment; Implications for Calculating Suspended Sediment Concentrations Using Single Frequency Acoustic Backscatter - (Proceedings)
Kuhnle, R.A., Wren, D.G., Chambers, J.P. 2006. Prediction of the grain size of suspended sediment; implications for calculating suspended sediment concentrations using single frequency acoustic backscatter. In: Proceedings of the 8th Federal Interagency Sedimentation Conference, April 2-6,2006, Reno, Nevada. CDROM.
Velocity and Suspended-Sediment Measurements over Mobile Sand Dunes in a Laboratory Flume - (Proceedings)
Wren, D.G., Kuhnle, R.A., Wilson, C.G. Velocity and suspended-sediment measurements over mobile sand dunes in a laboratory flume. Environmental and Water Resources Institute World Congress Proceedings. Available: http://ascelibrary.org/2005conferences/ASCECP000173040792
Distributions of Velocity, Turbulence, and Suspended Sediment over Low-Relief Antidunes - (Peer Reviewed Journal)
Wren, D.G., Bennett, S.J., Barkdoll, B.D., Kuhnle, R.A. 2005. Distributions of velocity, turbulence, and suspended sediment over low-relief antidunes. Journal of Hydraulic Research. 43(1): 3-11.
Last Modified: 11/21/2013
Footer Content Back to Top of Page