Urban Reforestation as a stormwater management tool
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Transcript of Urban Reforestation as a stormwater management tool
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URBAN REFORESTAT
ION AS A
STORMWATE
R MANAGEMEN
T
TOOL
GEOG591 Final ProjectBy: Sophie Wilderotter, Tyler Tran, Casey Stern,
Sarah Rhodes and Kaitlin Finan
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INTRODUCTION• Negative Impacts of Urbanization and Impervious Cover:
Physical impacts: Increased velocity /volume of runoff, Flooding, Erosion of Stream Banks, Decline in Infiltration and Groundwater Recharge, Degradation of Riparian Zones
Ecological Impacts: Contamination of water bodies by non-point source pollution can cause stress for aquatic organisms such as: hypoxia by nutrients (N &P), pathogen contamination of shellfish beds, physiological effects by toxic chemicals
(Arnold and Gibbons, 1996)
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A STORM-WATER MANAGEMENT TOOL: REFORESTATION
• Increased evapotranspiration• Reduced runoff• Potential tool for Carbon
sequestration
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STUDY OBJECTIVES(1)Quantify and characterize the tree cover, including
the life form, extent of trees and LAI, in Chapel Hill and Carrboro, NC
(2)Determine suitable regions for reforestation in Chapel Hill and Carrboro alongside roadways and sidewalks and areas of low LAI
(3)Estimate the water balance change that would result from increasing tree cover in this region.
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FLOW CHART
Current Tree Extent (Sophie, Casey, Kaitlin)
• LAI• Tree Type
Potential for Reforestation (Sarah, Tyler)
• Land Cover• Buffer• Interception
Water Balance Change (Everyone)
• Evapotranspiration
• 50 vs 100% of potential
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STUDY SITE• Municipalities of Chapel Hill and Carrboro
combined• 77.2 square kilometers• Created a shape file of the outline of our
study area
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METHODS: LAI AND TREE EXTENTLAI from EVI and Dr. Song, Forests from NLCDRaster Calculator
•BL_LAI = (NLCD==41)*LAI •CN_LAI = (NLCD==42)*LAI•MX_LAI = (NLCD==43)*LAI
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CONTINUEDWeighted Average LAI by tree type in Excel
Reclassification to find extent of Trees
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TREE COVER EXTENT BY LAI
Average LAI Results:
Conifer: 6.06Deciduous: 8.32Mixed: 6.64
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RESULTS: TREE COVER EXTENT BY TREE TYPE
Conifer= 6.3 km2, 8.2% Deciduous= 11.9 km2, 15.4% Mixed= 1.3 km2, 1.7%
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IMPERVIOUS, GRASS AND BARREN IN CHAPEL HILL/CARRBORO
Cover Type Area (m2)Trees 43,454,039Water 533,369Impervious 10,778,014Buildings 4,874,686Grass 7,743,444Barren 284,467
•Potential for Tree Cover Expansion (Tyler and Sarah)•Grass/barren land, parking lots, alongside streams, sidewalks not surrounded by impervious •Using CH/Carrboro mask of South Orange Classification, we determined areas of barren land, impervious surface, and grass. Calculate proportion of these areas that would be appropriate for reforestation
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POTENTIAL FOR REFORESTATION ALONGSIDE ROADS/SIDEWALKS
• Buffer Information: We created a 2m buffer surrounding impervious surfaces in CH/Carrboro, here is the area of the buffer covered by grass and barren:
Grass: 2,120,780m2
Barren: 28,914m2
1. Area of impervious covered if broadleaved were to be planted in suitable areas around roads/sidewalks=
(4.09m)*(1,074,847m)= 4,396,124.23m2 interference area2. Area of impervious covered if loblolly
pines were to be planted in suitable areas around roads/sidewalks=
(3.175)*( 1,074,847m)=3,412,639.23m2
interference area
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LAI DISCUSSION
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http://26.media.tumblr.com/tumblr_l7lcjyuJiX1qdstgoo1_500.jpg: Algal blooms
http://media.treehugger.com/assets/images/2011/10/peru-national-reforestation-campaign.jpg: planting woman
REFERENCES