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May 11 @ 12:00 pm - 1:00 pm CDT

Deon Knights – NSF Postdoctoral Fellow – West Virginia University

 

Title:

The fate of nutrients in coastal freshwater systems: Examples from Wax Lake Delta and the Great Lakes

 

Abstract:

Nutrient inputs at coastal interfaces can be difficult to constrain where groundwater and river water mixes with ocean or lake water. My research aims at improving the assessment of nutrient loads in challenging coastal systems. In this talk, I discuss findings from two traditionally under monitored locations. I present estimates of groundwater discharge, a previously unaccounted source of nutrients, to the Great Lakes coast using high-resolution geospatial analysis. By integrating land use data, I also identify areas of the coast that are vulnerable to high nutrient loads from groundwater. In the second study, I use mesocosms to measure nitrate removal rates in a coastal wetland of Wax Lake Delta, Louisiana USA. Results suggest that summertime nitrate removal kinetics are highly correlated with a widely available remotely-sensed vegetation index (NDVI). Numerical simulations suggest that nitrate removal may be intrinsically limited in river-dominated deltas to a small fraction of the incoming nitrate load. From a management standpoint, nitrate removal efficiency can be improved by designing river diversions to build steeper deltas. However, manmade deltas alone cannot remove most nitrate discharging to the sea. Policy that addresses the nitrate load upstream is necessary to further reduce coastal nitrate loading.

 

Details

Date:
May 11
Time:
12:00 pm - 1:00 pm CDT
Event Categories:
,

Venue

Keith-Wiess Geological Laboratories
Rice University, 6100 Main Street, MS 126
Houston, TX 77005 United States
+ Google Map
Phone:
713-348-4880
Website:
earthscience.rice.edu

Details

Date:
May 11
Time:
12:00 pm - 1:00 pm CDT
Event Categories:
,

Venue

Keith-Wiess Geological Laboratories
Rice University, 6100 Main Street, MS 126
Houston, TX 77005 United States
+ Google Map
Phone:
713-348-4880
Website:
earthscience.rice.edu

For outside visitors, the best way to get to our department is to come in on Rice Blvd and turn left into entrance 20 (intersection of Rice and Kent St.). At the stop sign, you will see a visitor parking lot on your right.  From there, walk east to the department.  The google map below shows exactly where our building is.