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Spatial and Temporal Variations in Streamflow, Dissolved Nitrate, and Total Phosphorus in the Rio Grande from Del Norte, Colorado, to El Paso, Texas, 1993-95. By Stephanie J. Moore and Scott K. Anderholm. National Water Quality Assessment Program NAWQA. Overview.

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By stephanie j moore and scott k anderholm

Spatial and Temporal Variations in Streamflow, Dissolved Nitrate, and Total Phosphorus in the Rio Grande from Del Norte, Colorado, to El Paso, Texas, 1993-95

By Stephanie J. Moore and Scott K. Anderholm

National Water Quality Assessment Program

NAWQA


Overview

Overview

  • Describe spatial and temporal variations in streamflow and nutrient concentrations.

  • Use variations in streamflow to evaluate affects of inflows and diversions?

  • Use variations in nutrient concentrations to evaluate affects of inflows and instream processes?


By stephanie j moore and scott k anderholm

Data

Monthly water-quality samples --

collected from 1993 to 1995

Daily mean streamflow data --

calculated from continuous data


Rio grande valley study unit

Rio Grande Valley Study Unit

Areas of

ground-water

inflow

Agricultural areas

Rio Grande

Floodway and

Conveyance Channel

Elephant Butte

And Caballo

Reservoirs


Spatial variations in streamflow

2,400

Increasing

streamflow

Decreasing

streamflow

2,200

2,000

1,800

1,600

1,400

1,200

Decreases

by 650 ft3/s

1,000

800

600

400

2 + T = Sum

200

0

Spatial variations in streamflow

1993

1994

1995

Annual mean streamflow (ft3/s)

RGDelN RGTrinch Conejos Sum1 RGLob RGTJB Chama Sum2 RGOtowi Convey RGFldwy Sum3 RGLeasb RGElP

1 2 T Sum 3 4 T Sum 5 T 7 Sum 8 9


Temporal variations in streamflow

9,000

Temporal variations in streamflow

8,000

Otowi

7,000

6,000

5,000

Daily mean streamflow (ft3/s)

4,000

Rio Chama

Taos Jxn

3,000

2,000

1,000

0


Spatial variations in dissolved nitrate concentrations

Convey vs. Floodway

Reservoir

effects

Increase

Above

El Paso

Increase between Otowi and Isleta

Little change above Otowi

2.2

Spatial variations in dissolved nitrate concentrations

2.0

1.8

1.6

1.4

Dissolved nitrate (mg/L)

1.2

1.0

0.8

0.6

0.4

0.2

0

1 2 T 3 4 T 5 6 T 7 8 9


Temporal variations in dissolved nitrate concentrations between otowi and isleta

*RGOtowi

RGIsleta

Temporal variations in dissolved nitrate concentrationsbetween Otowi and Isleta

3

2

Dissolved nitrate (mg/L)

1

0

  • Generally, smaller nitrate concentrations during snowmelt.

  • Smallest increases (between sites) during snowmelt.

  • Larger concentrations during low flow.

  • (Otowi: Dec – Feb; Isleta: Aug – Sept)


By stephanie j moore and scott k anderholm

RGIsleta

RGConvey

RGFldwy

Temporal variations in dissolved nitrate concentrationsbetween Isleta and Elephant Butte (San Marcial)

3

2

Dissolved nitrate (mg/L)

1

0

  • Isleta to Floodway at San Marcial: little change.

  • Isleta to Convey: decrease in nitrate concentrations.

  • Convey: largest concentrations in Aug-Sept


Spatial variations in total phosphorus concentrations

Convey vs. Floodway

Reservoir

effects

Increase between Otowi and Isleta

Increase

Above

El Paso

Little change above Otowi

1.8

Spatial variations in total phosphorus concentrations

1.6

1.4

1.2

Total phosphorus (mg/L)

1.0

0.8

0.6

0.4

0.2

0

1 2 T 3 4 T 5 6 T 7 8 9


By stephanie j moore and scott k anderholm

*RGOtowi

RGIsleta

Temporal variations in total phosphorus concentrationsbetween Otowi and Isleta

1.0

Total phosphorus (mg/L)

0.5

0

  • Seasonal pattern at Otowi is typical:

  • Largest concentrations during snowmelt.

  • Isleta: Smallest concentrations during snowmelt.


By stephanie j moore and scott k anderholm

RGIsleta

RGFldwy

Temporal variations in total phosphorus concentrationsbetween Isleta and Elephant Butte

2.0

Total phosphorus (mg/L)

1.0

0

  • Isleta and Floodway: smallest concentrations during snowmelt.

  • Floodway: large concentrations during monsoon and early snowmelt.


Spatial variations in nutrient concentrations streamflow and nutrient loads

Spatial variations in nutrient concentrations, streamflow, and nutrient loads


Wrir 02 4224 http nm water usgs gov publications htm

WRIR 02-4224http://nm.water.usgs.gov/publications.htm


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