Assessment of flow paths in upland areas and vegetated buffers
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Assessment of Flow Paths in Upland Areas and Vegetated Buffers ASAE Annual Meeting 2004 August 2, 2004 I.J. Kim, S.L. Hutchinson, and J.M.S. Hutchinson* The department of Biological and Agricultural Engineering *The department of Geography Kansas State University, Manhattan, KS

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Assessment of flow paths in upland areas and vegetated buffers l.jpg

Assessment of Flow Paths in Upland Areas and Vegetated Buffers

ASAE Annual Meeting 2004

August 2, 2004

I.J. Kim, S.L. Hutchinson, and J.M.S. Hutchinson*

The department of Biological and Agricultural Engineering

*The department of Geography

Kansas State University, Manhattan, KS


Research background 1 l.jpg
Research Background (1) Buffers

  • Model assumption:

    • Uniform overland flow

    • Ex) WEPP, REMM, VFSMOD

  • Reality:

    • Concentrated surface runoff in fields

    • Dillaha, 1986 / Fabis et al, 1993 / Dosskey, 2002


Research background 2 l.jpg
Research Background (2) Buffers

  • Digital elevation model (DEM)

    • Calculation of hydrological attributes

      • Slope, contour line, hill shade, aspect, etc

      • Flow path and length

      • LS factor

    • Delineating contributing area (e.g. watershed)

    • Risk assessment for landscape susceptibility

  • 30 m DEM widely used for GIS-Hydrologic model

    • Accessible data source (i.e., USGS 30m DEM)

    • Less costly


Typical grid resolution in dem l.jpg
Typical grid resolution in DEM Buffers

High Cost and data storage


Purposes of study l.jpg
Purposes of Study Buffers

  • Delineating flow path networks and drainage boundaries for hillside areas and vegetated buffers

  • Determining a suitable grid size for parameterizing model inputs at field scale site


The study area fort riley ne l.jpg
The study area: Fort Riley NE Buffers

NIR Image

Kansas River


Slide8 l.jpg

Buffer: brushes / trees Buffers

Study Site

Hillside: grass


Gps receiver settings l.jpg
GPS Receiver Settings Buffers

  • Date: March 24th, 25th and April 14th 2004

  • Base station for DC: Range Control Office Station, Ft. Riley

  • PDOP*: position dilution of precision

  • Accuracy: ± 50 cm

  • Vertical accuracy error

    • a vertical control point (KF0640)

    • root mean square error (RMSE)



Method for creating dem l.jpg
Method for Creating DEM Buffers

  • TOPOGRID is essentially based on a discretised thin plate spline technique and an iterative finite difference interpolation.


Limitations and assumption l.jpg
Limitations and Assumption Buffers

  • Accuracy of grid DEM is dependent on GPS accuracy

  • Becoming overland flow to channel flow is dependent on the contributing area (the number of cells)


Drainage network delineation eight direction d8 model l.jpg
Drainage network delineation: BuffersEight direction (D8) model

N, 26

E, 20

W, 24

S, 22

  • FILL / FLOWDIRECTION / FLOWACCUMULATION

  • Define flow paths from the specific accumulation area (# cell)

  • BASIN / FLOWLENGTH


Hillside and buffer zone data points l.jpg
Hillside and Buffer Zone Data Points Buffers

# of points: 2998

AVG PDOP: 2.68

Highest: 399.0 m

Lowest: 382.5 m

RMSE

- 0.307 (XRS)

- 0.526 (XR)


Surface elevation variability l.jpg
Surface Elevation Variability Buffers

30m DEM

USGS 30m DEM

10m DEM

3 m DEM


Highest and lowest elevation at the entire areas and within the buffers l.jpg
Highest and Lowest Elevation Buffersat the Entire Areas and within the Buffers


Flow path and catchment area boundary cab l.jpg
Flow Path and Catchment Area Boundary (CAB) Buffers

30m DEM

USGS 30m DEM

10m DEM

3 m DEM


Longest flow length cab l.jpg
Longest Flow Length & CAB Buffers

*Flow length is the longest in the catchment boundary


Flow path and cab 3 m dem l.jpg
Flow Path and CAB (3 m DEM) Buffers

TH:90m2

TH:9m2

TH:450m2

TH:900m2


Conclusions l.jpg
Conclusions Buffers

  • 30m resolution should be avoided for determining flow paths, especially in the buffer areas

  • Grid size significantly influences flow direction, catchment area shape, and surface terrain complexity on the hillside and buffer areas.

  • 3m DEM provides the most detailed flow paths and catchment area boundaries

  • 90m2 (10 cells) in 3m DEM required for flow path delineation with in the buffer


Future studies l.jpg
Future Studies,,, Buffers

  • Applying larger resolution (e.g. 1m DEM) to the area and/or Ft. Riley

  • Applying advanced method to the flow direction

  • Evaluating effects of the flow length to hydrologic responses in a model


Acknowledgements l.jpg
Acknowledgements Buffers

  • The Strategic Environmental Research Development Program (SERDP)

  • Kansas State University Agricultural Experiment Station



Slide24 l.jpg

Buffer: brushes / trees Buffers

Study Site

Hillside: grass


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