Long Island Sound Prospects for the Urban Sea- John Mullaney  Chapter 5: Metals, Organic Compounds, and Nutrients in Long Island Sound: Sources, Magnitudes,

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Presentation transcript:

Long Island Sound Prospects for the Urban Sea- John Mullaney  Chapter 5: Metals, Organic Compounds, and Nutrients in Long Island Sound: Sources, Magnitudes, Trends, and Impacts USGS was asked to summarize nutrient trends from the major fall line stations where we have long-term water quality data.

Point Source Loads in Decline in Long Island Sound Management Zones Wet Deposition of Nitrogen to the Long Island Sound watershed has declined

Total Nitrogen 7 major fall line stations combined Methods: Fluxmaster Monotonic adjustment for changes in flow Schwarz GE, Hoos AB, Alexander RB, Smith RA. The SPARROW Surface Water-Quality Model: Theory, Application and User Documentation U.S. Geological Survey, Techniques and Methods Report, Book 6, Chapter B3, Reston, Virginia

Phosphorus and Changing Nutrient Ratios Total Phosphorus TN/TP

U.S. Department of the Interior U.S. Geological Survey The Use of EGRET Package for R on Trends in Nutrient and Chloride Concentrations and Loads, in the Long Island Sound Basin Quinebaug Quinebaug (JC) Shetucket Hockanum Connecticut Farmington Salmon Quinnipiac Bunnell Unionville Naugatuck Housatonic Saugatuck Norwalk In cooperation with the U.S. EPA Office of Long Island Sound and Connecticut DEEP John Mullaney Bob Hirsch

Objective  Evaluate trends in concentrations and loads of nitrogen, phosphorus, total organic carbon and silica, in the major tributaries of Long Island Sound, using a method that incorporates changes in streamflow during the study period  This information is important in understanding the effects of management action on Long Island Sound, and formulating an updated nitrogen TMDL

Large decreases in point source loads of nitrogen From Mullaney and Schwarz, 2013 Nitrogen loads flat or slight increase Reasons for this study:

Approach-EGRET overview Ingests water quality sample data, daily streamflow data, and meta data from USGS Web services or from user-supplied files Sub-systems: WRTDS* for river water quality data analysis and flowHistory for analysis of streamflow alone Goal: Exploration of the data to describe the evolving hydrologic system. Produce: graphs, summary statistics, understanding, and hypotheses. EGRET also contains a module on “FLOW HISTORY” (New “edge adjust” version being used for this project) *Weighted Regressions on Time, Discharge, and Season (WRTDS), with an application to Chesapeake Bay River inputs, 2010, Hirsch, Robert M.; Moyer, Douglas L.; Archfield, Stacey A., Journal of the American Water Resources Association, 46:

Changes in Mean Daily Flow, (percent)- Flow History Module in EGRET

Total Nitrogen Flux- WRTDS Green line is the flow-normalized