Storm Flow Sediment and Nutrient Concentrations across a Land Use Gradient in Southwest Ohio Streams

Authors: Jeffrey Lazar*, Miami University - Oxford, OH, Rachel Spahr, Miami University
Topics: Geomorphology
Keywords: Fluvial Geomorphology, Water Quality, Storm Water, Sediment pollution, Nutrient Pollution
Session Type: Paper
Day: 4/11/2018
Start / End Time: 10:00 AM / 11:40 AM
Room: Iberville, Marriott, River Tower Elevators, 4th Floor
Presentation File: No File Uploaded

Urban and agricultural landscape development in the U.S. Midwest has resulted in significant pollution of streams and lakes in the region. In this study, water samples were collected over a five month period during storm flow events in seven area streams with different watershed land uses, ranging from over 90% urban to less than 10% urban. Storm samples were collected at multiple discharges for each storm event using a USGS design for storm flow water collectors. The water samples were then analyzed for total suspended sediment, total nitrogen, total phosphorous, nitrate and phosphate. Storm events were summarized by calculating discharge weighted, event mean concentrations for the sediment and nutrients of interest. Stream stage was collected using HOBO U20 water level loggers and then converted into discharge using the USGS WinXSPro software. Multiple regression models will be used including multiple linear regression and a random effect model. These models will look to explain how land use drives sediment and nutrient concentrations holding discharge constant. We expect the results of these models to show that streams in urban watersheds will have higher concentrations of sediment and nutrients during storm flow events when compared to similar streams in agricultural watersheds.

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