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                    U.S. DEPARTMENT OF AGRICULTURE
 Watershed Physical Processes Research: Oxford, MS
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                        National Sedimentation Laboratory
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                        AGNPS - Agricultural Non-Point Source Pollution Model
                                    BSTEM - Bank Stability and Toe Erosion Model
                                    CONCEPTS - Conservational Channel Evolution and Pollutant Transport System
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Process studies on the mechanics of soil erosion have evolved to include remote sensing methods to accurately record changes in the landscape through time. Here, a digital elevation model (DEM) is displayed with mock cameras above, in the location used to obtain the images. Where two images overlap, the landscape can be described in three dimensional space. Proper alignment of two time periods offers insight into landscape change, erosion mechanics, sediment dynamics and evolution.
 Physical Hydrologist, Dr. Glenn Wilson measuring subsurface flow through a soil pipe in a gully formed by pipe collapse. Internal erosion of the soil pipes results in various pipe collapse features on the surface including sinkholes, flute holes, and gullies. These processes are being studied in the field and laboratory by WPPRU scientist.
 Hydraulic Technician Glenn Gray (R) and Research Hydraulic Engineer Daniel Wren (L) prepare an instrument tower on the severely damaged levee of an irrigation reservoir in Arkansas.
 Research Hydraulic Engineer Eddy Langendoen examines the condition of a laboratory flume set up for studying the transport of sand through cobbles.


**National Sedimentation Lab Units** Watershed Physical Processes Research Unit
Water Quality and Ecology Research Unit **Affiliated Research Organizations** Delta Water Management Research Unit
Natural Products Utilization Research Unit
National Center for Computational Hydroscience and Engineering
National Center for Physical Acoustics


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Agricultural Non-Point Source Pollution Model-AGNPS
CONCEPTS
Bank Stability and Toe Erosion Model - BSTEM
Rainfall Intensity Summarization Tool - RIST
Revised Universal Soil Loss Equation - RUSLE


Southeast Area   ron.bingner@usda.gov


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