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Land use and nutrient patterns in upstream watersheds of St. Martin
River
Kris Beckert, Thomas Fisher,
Roman Jesien, Ben Fertig, Judy O’Neil,
Tim Carruthers, Bill Dennison
Methods
• Monthly nutrient data obtained for 6 streams in St. Martin River watershed July 2006-Jan 2008
• Aerial photography used to re-draw land use polygons in GIS
• Land use calculation for stream sub-watersheds in St. Martin River region
• USGS average monthly discharge data for Birch Branch at Showell July 2006- Sept 2007
• Total Nitrogen and Total Phosphorus yearly loading• Regression analysis of land use vs. Dec-March nutrient
concentrations
St. Martin River 2005 Aerial Photography
St. Martin River 2005 Aerial Photography
Correction of Land Use Polygons• 2002 land use files
obtained from Maryland Department of Planning
• Overestimation of land use, especially feeding operations
• Polygons re-drawn closer to aerial imagery
Initial Feeding
Operations Polygon
Correction of Land Use Polygons• 2002 land use files
obtained from Maryland Department of Planning
• Overestimation of land use, especially feeding operations
• Polygons re-drawn closer to aerial imagery
New Feeding
Operations
Polygon
Forest
Stream Sites
B8
B6
B5
B3B2
B1
USGS
gage
B1: Dam
Watershed area (ha)
3056
N load (y-1) 30,970
Average TNha-1yr-1 10.14
P load (y-1) 1,325
Average TPha-1yr-1 0.43
B2: Slab Bridge at Hotel Rd.
Watershed area (ha)
131
N load (y-1) 1,455
Average TNha-1yr-1 12.79
P load (y-1) 47
Average TPha-1yr-1 0.36
B3: Carey Branch at Hotel Rd
Watershed area (ha)
1,593
N load (y-1) 14,643
Average TNha-1yr-1 9.20
P load (y-1) 601
Average TPha-1yr-1 0.38
B5: Bunting Branch at Rt. 54
Watershed area (ha)
907
N load (y-1) 11,537
Average TNha-1yr-1 12.71
P load (y-1) 316
Average TPha-1yr-1 0.35
B6: Unnamed Tributary
Watershed area (ha)
133
N load (y-1) 2,623
Average TNha-1yr-1 19.67***
P load (y-1) 46
Average TPha-1yr-1 0.35*
*Lowest observed value***Highest observed value
B8: Church Branch
Watershed area (ha)
1284
N load (y-1) 11,585
Average TNha-1yr-1 9.02*
P load (y-1) 588
Average TPha-1yr-1 0.46***
*Lowest observed value***Highest observed value
Regressions: Nitrogen vs. Anthropogenic land use
Regressions: Phosphorus vs. Anthropogenic land
use
Regressions: Nitrogen vs. Feeding Operations
Regressions: Phosphorus vs. Feeding Operations
Regressions: Nitrogen vs. Natural
Regressions: Phosphorus vs. Natural