![Page 1: Transport of nitrogen and phosphorus from Rhode River watersheds during storm events](https://reader036.vdocuments.net/reader036/viewer/2022062723/56813e58550346895da84a71/html5/thumbnails/1.jpg)
Transport of nitrogen and phosphorus from Rhode River watersheds during storm events
David Correll, Thomas Jordan, and Donald WellerWater Resources Research, 1999. Vol. 35 No 8 pg 2513-2521
![Page 2: Transport of nitrogen and phosphorus from Rhode River watersheds during storm events](https://reader036.vdocuments.net/reader036/viewer/2022062723/56813e58550346895da84a71/html5/thumbnails/2.jpg)
Why this paper?
•One of many papers from the SERC on the Rhode River Watershed since the 1970s
•Effects of land use, season, and storm characteristics on nutrient transport
![Page 3: Transport of nitrogen and phosphorus from Rhode River watersheds during storm events](https://reader036.vdocuments.net/reader036/viewer/2022062723/56813e58550346895da84a71/html5/thumbnails/3.jpg)
Land Use effects: 4 watershedsWatershed 101 Mixed Use Land UseWatershed 109 CropsWatershed 110 ForestWatershed 111 Grazed
ForestRow cropsPasture and Hay fieldsResidentialOld Fields
Site Description
![Page 4: Transport of nitrogen and phosphorus from Rhode River watersheds during storm events](https://reader036.vdocuments.net/reader036/viewer/2022062723/56813e58550346895da84a71/html5/thumbnails/4.jpg)
Site Description
![Page 5: Transport of nitrogen and phosphorus from Rhode River watersheds during storm events](https://reader036.vdocuments.net/reader036/viewer/2022062723/56813e58550346895da84a71/html5/thumbnails/5.jpg)
Chemistry
• Phosphorus– PPi, Dpi, POP, DOP
• Nitrogen– NO3-, NH4, PON, DON
– Continuous baseflow samples and storm samples
– Collected and returned w/in 24 hr
– Filtered 0.45 m
![Page 6: Transport of nitrogen and phosphorus from Rhode River watersheds during storm events](https://reader036.vdocuments.net/reader036/viewer/2022062723/56813e58550346895da84a71/html5/thumbnails/6.jpg)
Discharge
120° and 150 ° V notch weirsStilling wells, floats every 5 minutes
![Page 7: Transport of nitrogen and phosphorus from Rhode River watersheds during storm events](https://reader036.vdocuments.net/reader036/viewer/2022062723/56813e58550346895da84a71/html5/thumbnails/7.jpg)
6 /1 2 /0 2 1 5 :3 0 6 /1 2 /0 2 1 7 :1 0 6 /1 2 /0 2 1 8 :4 9 6 /1 2 /0 2 2 0 :2 9 6 /1 2 /0 2 2 2 :0 90
0 .0 2
0 .0 4
0 .0 6
0 .0 8
0 .1D
isch
arge
(cm
s)
3 0
4 0
5 0
6 0C
oncentration (mg/l)
t
t
ii
o
QCL
Steps:1. Connect the concentrations using a linear
interpolation2. Integrate the instantaneous load for the period
between the first sample and the last using equation (1)
(1)
Loads: Linear interpolation
![Page 8: Transport of nitrogen and phosphorus from Rhode River watersheds during storm events](https://reader036.vdocuments.net/reader036/viewer/2022062723/56813e58550346895da84a71/html5/thumbnails/8.jpg)
Base flow vs. Storm
Storm Particulate + Dissolved Fractions added
![Page 9: Transport of nitrogen and phosphorus from Rhode River watersheds during storm events](https://reader036.vdocuments.net/reader036/viewer/2022062723/56813e58550346895da84a71/html5/thumbnails/9.jpg)
Characteristic Storms (WS 101)
![Page 10: Transport of nitrogen and phosphorus from Rhode River watersheds during storm events](https://reader036.vdocuments.net/reader036/viewer/2022062723/56813e58550346895da84a71/html5/thumbnails/10.jpg)
P and N Dynamics June storm (WS 101)
P N
![Page 11: Transport of nitrogen and phosphorus from Rhode River watersheds during storm events](https://reader036.vdocuments.net/reader036/viewer/2022062723/56813e58550346895da84a71/html5/thumbnails/11.jpg)
Storm P & N Dynamics (all 4)
P N
![Page 12: Transport of nitrogen and phosphorus from Rhode River watersheds during storm events](https://reader036.vdocuments.net/reader036/viewer/2022062723/56813e58550346895da84a71/html5/thumbnails/12.jpg)
Seasonal P Comparison
WS 101: Mixed LU WS 109: Cropland LU
![Page 13: Transport of nitrogen and phosphorus from Rhode River watersheds during storm events](https://reader036.vdocuments.net/reader036/viewer/2022062723/56813e58550346895da84a71/html5/thumbnails/13.jpg)
Seasonal N Comparison WS 101: Mixed LU WS 109: Cropland LU
Summer: Particulates
![Page 14: Transport of nitrogen and phosphorus from Rhode River watersheds during storm events](https://reader036.vdocuments.net/reader036/viewer/2022062723/56813e58550346895da84a71/html5/thumbnails/14.jpg)
P c-Q relationships
![Page 15: Transport of nitrogen and phosphorus from Rhode River watersheds during storm events](https://reader036.vdocuments.net/reader036/viewer/2022062723/56813e58550346895da84a71/html5/thumbnails/15.jpg)
N/P Relationships
Mainly due to increases in Particulate P
![Page 16: Transport of nitrogen and phosphorus from Rhode River watersheds during storm events](https://reader036.vdocuments.net/reader036/viewer/2022062723/56813e58550346895da84a71/html5/thumbnails/16.jpg)
Discussion
Particulate nutrients related to soil, soil erosion.
![Page 17: Transport of nitrogen and phosphorus from Rhode River watersheds during storm events](https://reader036.vdocuments.net/reader036/viewer/2022062723/56813e58550346895da84a71/html5/thumbnails/17.jpg)
Discussion
Peak water discharge correlated to mean particulate nutrient concentrations– Eliminating need to know rainfall volume or intensity
– Smaller 1st order catchments
– Shorter, more intense storm discharges
[NH4] increased with peak water discharge- slopes much lower
![Page 18: Transport of nitrogen and phosphorus from Rhode River watersheds during storm events](https://reader036.vdocuments.net/reader036/viewer/2022062723/56813e58550346895da84a71/html5/thumbnails/18.jpg)
Discussion
• Sampling implications• 1 large summer storm
– 24% of TP for entire summer
– 18% of TPi for entire summer
– 30% of TOP for entire spring
– 18.5% of TON for entire spring
• 1 large spring storm– 39% of TP for entire
spring
– 41% of TPi for entire spring
– 38% of TOP for entire spring
– 12% of of TON for entire spring
![Page 19: Transport of nitrogen and phosphorus from Rhode River watersheds during storm events](https://reader036.vdocuments.net/reader036/viewer/2022062723/56813e58550346895da84a71/html5/thumbnails/19.jpg)
Questions?????• Why do storms increase particulate nutrient
concentrations but do not influence dissolved concentrations?
• If sediment related, why isn’t rain (detachment) as important as flow?
• Implications for sampling: every storm? Or use different load estimation?
• Internal validity- are differences really seasonal and land use related
• External validity? – how is this applicable to other watersheds