Model:SPARROW: Difference between revisions

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{{Model identity
|Model type=Single
}}
{{Start models incorporated}}
{{End a table}}
{{Model identity2
|ModelDomain=Terrestrial, Hydrology
|Spatial dimensions=2D
|Spatialscale=Continental, Landscape-Scale, Regional-Scale, Watershed-Scale
|One-line model description=The SPARROW Surface Water-Quality Model
|Extended model description=SPARROW (SPAtially Referenced Regressions On Watershed attributes) is a watershed modeling technique for relating water-quality measurements made at a network of monitoring stations to attributes of the watersheds containing the stations. The core of the model consists of a nonlinear regression equation describing the non-conservative transport of contaminants from point and diffuse sources on land to rivers and through the stream and river network. The model predicts contaminant flux, concentration, and yield in streams and has been used to evaluate alternative hypotheses about the important contaminant sources and watershed properties that control transport over large spatial scales.
}}
{{Start model keyword table}}
{{Model keywords
|Model keywords=biogeochemistry
}}
{{Model keywords
|Model keywords=water quality
}}
{{End a table}}
{{Modeler information
{{Modeler information
|First name=Richard
|First name=Richard
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|Town / City=Reston
|Town / City=Reston
|Postal code=20192
|Postal code=20192
|Country=United States
|State=Virginia
|State=Virginia
|Country=USA
|Email address=ralex@usgs.gov
|Email address=ralex@usgs.gov
|Phone=703-648-6869
|Phone=703-648-6869
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|Additional last name=Preston
|Additional last name=Preston
|Additional type of contact=Model developer
|Additional type of contact=Model developer
|Additional country=USA
|Additional country=United States
|Additional email address=spreston@usgs.gov
|Additional email address=spreston@usgs.gov
}}
}}
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|Additional first name=Gregory
|Additional first name=Gregory
|Additional last name=Schwarz
|Additional last name=Schwarz
|Additional country=USA
|Additional country=United States
|Additional email address=gschwarz@usgs.gov
|Additional email address=gschwarz@usgs.gov
}}
}}
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|Additional first name=Richard
|Additional first name=Richard
|Additional last name=Smith
|Additional last name=Smith
|Additional country=USA
|Additional country=United States
|Additional email address=rsmith1@usgs.gov
|Additional email address=rsmith1@usgs.gov
}}
{{Model identity
|Model type=Single
|Categories=Hydrology, Terrestrial
|Spatial dimensions=2D
|Spatialscale=Continental, Regional-Scale, Landscape-Scale, Watershed-Scale
|One-line model description=The SPARROW Surface Water-Quality Model
|Extended model description=SPARROW (SPAtially Referenced Regressions On Watershed attributes) is a watershed modeling technique for relating water-quality measurements made at a network of monitoring stations to attributes of the watersheds containing the stations. The core of the model consists of a nonlinear regression equation describing the non-conservative transport of contaminants from point and diffuse sources on land to rivers and through the stream and river network. The model predicts contaminant flux, concentration, and yield in streams and has been used to evaluate alternative hypotheses about the important contaminant sources and watershed properties that control transport over large spatial scales.
}}
}}
{{Model technical information
{{Model technical information
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|Start year development=1992
|Start year development=1992
|Does model development still take place?=Yes
|Does model development still take place?=Yes
|DevelopmentCode=Active
|DevelopmentCodeYearChecked=2020
|Model availability=As code
|Model availability=As code
|Source code availability=Through web repository
|Source code availability=Through web repository
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|Program license type=Other
|Program license type=Other
|Program license type other=NOT SURE
|Program license type other=NOT SURE
|OpenMI compliant=No not possible
|CCA component=No not possible
|IRF interface=No not possible
|Memory requirements=--
|Memory requirements=--
|Typical run time=--
|Typical run time=--
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|Output format=Binary
|Output format=Binary
|Pre-processing software needed?=No
|Pre-processing software needed?=No
|Describe pre-processing software=--
|Post-processing software needed?=No
|Post-processing software needed?=No
|Describe post-processing software=--
|Visualization software needed?=No
|Visualization software needed?=No
|Other visualization software=--
}}
}}
{{Process description model
{{Process description model
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|Describe any numerical limitations and issues=--
|Describe any numerical limitations and issues=--
}}
}}
{{Model testing
{{Model testing}}
|Describe available calibration data sets=--
|Describe available test data sets=--
|Describe ideal data for testing=--
}}
{{Users groups model
{{Users groups model
|Do you have current or future plans for collaborating with other researchers?=--
|Do you have current or future plans for collaborating with other researchers?=--
}}
}}
{{Documentation model
{{Documentation model
|Provide key papers on model if any=Key papers:
*Hoos , A.B. and G. McMahon, 2009, Spatial analysis of instream nitrogen loads and factors controlling nitrogen delivery to streams in the southeastern United States using Spatially Referenced Regression on Watershed Attributes (SPARROW) and regional classification frameworks, Hydrological Processes, in press.
*Robertson , D.M., Schwarz, G.E., Saad, D.A., and Alexander, R.B., 2009, Incorporating uncertainty into the ranking of SPARROW model nutrient yields from Mississippi/Atchafalaya River basin watersheds, Journal of the American Water Resources Association, 42, 534-549. [Supporting information: phosphorus , nitrogen]
*Preston, S.D., Alexander, R.B., Woodside, M.D., and Hamilton, P.A., SPARROW MODELING--Enhancing Understanding of the Nation's Water Quality, U.S. Geological Survey Fact Sheet 2009-3019, 6 p.
*Alexander, R.B., Böhlke, J.K., Boyer, E.W., David, M.B., Harvey, J.W., Mulholland, P.J., Seitzinger, S.P., Tobias, C.R., Tonitto, C., and Wollheim, W.M., 2009 Dynamic modeling of nitrogen losses in river networks unravels the coupled effects of hydrological and biogeochemical processes, Biogeochemistry, 93,1/2, 91-116. DOI:10.1007/s110533-008-9274-8 (Special Issue: New Approaches to Modeling Denitrification)
*Harrison, J.A., Maranger, R.J., Alexander, R.B., Giblin, A.E., Jacinthe, P.A., Mayorga, E., Seitzinger, S.P., Sobata, D.J., and Wollheim, W.M., 2009, The regional and global significance of nitrogen removal in lakes and reservoirs, Biogeochemistry, 93, 1/2, 143-157. DOI:10.1007/s10533-008-9272-x (Special Issue: New Approaches to Modeling Denitrification)
*Böhlke, J.K., Antweiler, R.C., Harvey, J.W., Laursen, A.E., Smith, L.K., Smith, R.L., and Voytek, M.A., 2009, Multi-scale measurements and modeling of denitrification in streams with varying flow and nitrate concentration in the upper Mississippi River basin, USA, Biogeochemistry, 93,1/2, 117-141. DOI:10.1007/s10533-008-9282-8 (Special Issue: New Approaches to Modeling Denitrification)
*Schwarz, G.E., 2008, A Preliminary SPARROW model of suspended sediment for the conterminous United States, U.S. Geological Survey Open-File Report 2008–1205, 8 p.
*Alexander, R.B., Smith, R.A., Schwarz, G.E., Boyer, E.W., Nolan, J.V., and Brakebill, J.W., 2008, Differences in phosphorus and nitrogen delivery to the Gulf of Mexico from the Mississippi River Basin, Environ. Sci. Technol., 42, 3, 822-830. DOI:10.1021/es0716103
*Alexander, R.B., Boyer, E.W., Smith, R.A., Schwarz, G.E., and Moore, R.B., 2007, The role of headwater streams in downstream water quality, Journal Amer. Water Resources Assoc. 43, 41-59. DOI:10.1111/j.1752-1688.2007.00005.x (Abstract, PDF, HTML ) JAWRA Featured Collection on Headwaters Hydrology
*Scott, D., Harvey, J., Alexander, R., and G. Schwarz, 2007, Dominance of organic nitrogen from headwater streams to large rivers across the conterminous U.S., Global Biogeochemical Cycles, 21, GB1003, DOI:10.1029/2006GB002730.
*Anning, D.W., Bauch, N.J., Gerner, S.J., Flynn, M.E., Hamlin, S.N., Moore, S.J., Schaefer, D.H., Anderholm, S.K., and Spangler, L.E., 2007, Dissolved solids in basin-fill aquifers and streams in the southwestern United States, U.S. Geological Survey Scientific Investigations Report 2006-5315.
*Boyer, E.W., Alexander, R.B., Parton, W.J., Li, C., Butterbach-Bahl, K., Donner, S.D., Skaggs, R.W., and S.J. Del Grosso, 2006, Modeling denitrification in terrestrial and aquatic ecosystems at regional scales, Ecological Applications, 16, 2123-2142. (Invited Feature on Denitrification Across Landscapes and Waterscapes)
*Schwarz, G.E., Hoos, A.B., Alexander, R.B., and R.A. Smith, 2006, The SPARROW surface water-quality model: Theory, application, and user documentation, U.S. Geological Survey Techniques and Methods Report, Book 6, Chapter B3.
*Alexander, R.B., and R.A. Smith, 2006, Trends in the nutrient enrichment of U.S. rivers during the late 20th century and their relation to changes in probable stream trophic conditions, Limnology and Oceanography, 51, 639-654. (L&O special issue on Eutrophication of Freshwater and Marine Ecosystems)
*Alexander, R.B., Smith, R.A., and Schwarz, G.E., 2006, Comment on "In-stream nitrogen attenuation: Model-aggregation effects and implications for coastal nitrogen impacts", Environmental Science and Technology, 40, 2485-6.
*Elliott, A.H., Alexander, R.B., Schwarz, G.E., Shankar U., Sukias, J.P.S., McBride, G.B., 2005, Estimation of nutrient sources and transport for New Zealand using the hybrid physical-statistical model SPARROW, New Zealand Journal of Hydrology, 44, 1-27.
*Moore, R.B., Johnston, C.M., Robinson, K.W., and Deacon, J.R., 2004, Estimation of total nitrogen and phosphorus in New England streams using spatially referenced regression models, U.S. Geological Survey Scientific Investigations Report 2004-5012.
*Ierardi, M.C., R.B. Alexander, G.E. Schwarz, and R.A. Smith, 2004, SPARROW-WEB: A graphical interactive system for displaying reach-level water-resource information for rivers of the conterminous United States, Proceedings of the AWRA Spring Specialty Conference, Geographic Information Systems and Water Resources III, Nashville, Tennessee, May 17-19, 2004.
*Brakebill, J.W., and Preston, S.E., 2004, Digital data used to relate nutrient inputs to water quality in the Chesapeake Bay Watershed, Version 3.0, U.S. Geological Survey Open-File Report 2004-1433
*Alexander, R.B., Smith, R.A., and Schwarz, G.E., 2004, Estimates of diffuse phosphorus sources in surface waters of the United States using a spatially referenced watershed model, Water Science and Technology, 49, 1-10 (Article PDF).
*Smith, R.A., Alexander, R.B., and Schwarz, G.E., 2003, Estimating the natural background concentrations of nutrients in streams and rivers of the conterminous United States, Environ. Sci. Tech., 37, 3039-3047 (Article; Supporting Information; Data for Fig. 7).
*McMahon, G., Alexander, R.B., Qian, S., 2003, Support of TMDL programs using spatially referenced regression models, ASCE Journal of Water Resources Planning and Management, 129, 315-329. (Special Issue TMDL Approach to Water Quality Management)
*Brakebill, J.W., and Preston, S.E., 2003, A hydrologic network supporting spatially referenced regression modeling in the Chesapeake Bay watershed, Environ. Mon. Assess., 81, 73-84.
*Alexander, R.B., Elliott, A.H., Shankar, U., and McBride, G.B., 2002, Estimating the sources and transport of nutrients in the Waikato River Basin, New Zealand, Water Resources Research, 38, 1268-1290.
*Alexander, R.B., Johnes, P.J., Boyer, E.W., and Smith, R.A., 2002, A comparison of models for estimating the riverine export of nitrogen from large watersheds, Biogeochemistry, 57/58, 295-339. (Biogeochemistry Special Issue on The Nitrogen Cycle at Regional to Global Scales)
*Seitzinger, S.P., Styles, R.V., Boyer, E.W., Alexander, R.B., Billen, G., Howarth, R.W., Mayer, B., and van Breemen, N., 2002, Nitrogen retention in rivers: Model development and application to watersheds in the eastern United States, Biogeochemistry, 57/58.
*McMahon, G, and Roessler, C., 2002, A regression-based approach to understand baseline total nitrogen loading for TMDL planning, Proceedings of Water Environment Federation National TMDL Science and Policy Conference, Phoenix, Arizona, November 13-16, 2002 (Article PDF).
*Nolan, J.V., Brakebill, J.W., Alexander, R.B., and Schwarz, G.E., 2002, Enhanced River Reach File 2, (U.S. Geological Survey Open-File Report 02-40, Reston, Virginia).
*Sauer, T.J., Alexander, R.B., Brahana, J.V., and R.A. Smith, 2001, The importance and role of watersheds in the transport of nitrogen, in Nitrogen in the environment: Sources, problems, and management, Follett, R.F. and J.L. Hatfield (eds.) Elsevier Science Publishers, the Netherlands.
*Schwarz, G.E., Smith, R.A., Alexander, R.B., and Gray, J.R., 2001, A spatially referenced regression model (SPARROW) for suspended sediment in streams of the conterminous U.S., in U.S. Subcommittee on Sedimentation, Proceedings of the Seventh Federal Interagency Sedimentation Conference, March 25-29, 2001, Reno, Nevada USA, pp. VII-80-7.
*Alexander, R.B., Smith, R.A. Schwarz, G.E., Preston, S.D., Brakebill, J.W., Srinivasan, R., and Pacheco, P.A., 2001, Atmospheric Nitrogen Flux from the Watersheds of Major Estuaries of the United States: An Application of the SPARROW Watershed Model, In: Nitrogen Loading in Coastal Water Bodies: An Atmospheric Perspective, American Geophysical Union Monograph 57, Richard Valigura, Richard Alexander, Mark Castro, Tilden Meyers, Hans Paerl, Paul Stacey, and R. Eugene Turner (eds.) pp. 119-170.
*Stacey, P.E., Greening, H.S., Kremer, J.N., Peterson, D., and Tomasko, D.A., 2001, Contributions of Atmospheric Nitrogen Deposition to U.S. Estuaries: Summary and Conclusions, In: Nitrogen Loading in Coastal Water Bodies: An Atmospheric Perspective, American Geophysical Union Monograph 57, Richard Valigura, Richard Alexander, Mark Castro, Tilden Meyers, Hans Paerl, Paul Stacey, and R. Eugene Turner (eds.).
*Alexander, R.B., Smith, R.A., and Schwarz, G.E., 2000, Effect of stream channel size on the delivery of nitrogen to the Gulf of Mexico, Nature, 403, 758-761.
*Smith, R.A. and Alexander, R.B., 2000, Sources of Nutrients in the Nation's Watersheds In: Managing Nutrients and Pathogens from Animal Agriculture, Proceedings from the Natural Resource, Agriculture, and Engineering Service Conference for Nutrient Management Consultants, Extension Educators, and Producer Advisors March 28-30, 2000, Camp Hill, Pennsylvania
*Alexander, R.B., Brakebill, J.W., Brew, R.E., and Richard A. Smith, 1999, ERF1—Enhanced River Reach File 1.2 (U.S. Geological Survey Open-File Report 99-457, Reston, Virginia).
*Alexander, R.B., Smith, R.A., Focazio, M.J., and Horn, M.A., 1999, Source-Area Characteristics of Large Public Surface-Water Supplies in the Conterminous United States: An Information Resource for Source-Water Assessment (U.S. Geological Survey Open-File Report 99-248, Reston, Virginia).
*Preston, S.D. and Brakebill, J.W., 1999, Application of Spatially Referenced Regression Modeling for the Evaluation of Total Nitrogen Loading in the Chesapeake Bay Watershed (U.S. Geological Survey Water Resources Investigations Report 99-4054, Baltimore, Maryland).
*Brakebill, J.W, and Preston, S.E., 1999, Digital Data Used to Relate Nutrient Inputs to Water Quality in the Chesapeake Bay Watershed, Version 1.0 (U.S. Geological Survey Water Open-File Report 99-60).
*Brezonik, P.L. & V.J. Bierman, V.J. (co-chairs), R. Alexander, J. Anderson, J. Barko, M. Dortch, L. Hatch, D. Keeney, D. Mulla, V. Smith, C. Walker, T. Whitledge, and W. Wiseman (task group members), 1999, Effects of reducing nutrient loads to surface waters within the Mississippi River Basin and the Gulf of Mexico (Report of Task Group 4 to the White House Committee on Environment and Natural Resources, Hypoxia Work Group) Federal Register, 64, 23834-23835.
*Alexander, R.B., Slack, J.R., Ludtke, A.S., Fitzgerald, K.K., and Schertz, T.L., 1998, Data from selected U.S. Geological Survey National Stream Water-Quality Monitoring Networks, Water Resources Research, 34, 9, 2401-2405.
*Smith, R.A., Schwarz, G.E., and Alexander, R.B., 1997, Regional interpretation of water-quality monitoring data , Water Resources Research, 33, 12, 2781-2798.
*Alexander, R.B., Slack, J.R., Ludtke, A.S., Fitzgerald, K.K., and Schertz, T.L., 1996, Data from Selected U.S. Geological Survey National Stream Water-Quality Monitoring Networks (WQN) (U.S. Geological Survey Digital Data Series—DDS 37, Reston, Virginia).
*Alexander, R.B., Murdoch, P.S., and Smith, R.A., 1996, Streamflow-induced variations in nitrate flux in tributaries to the Atlantic Coastal Zone, Biogeochemistry, 33, 149-177.
*Schwarz, G.E. and Alexander, R.B., 1995, State Soil Geographic (STATSGO) Data Base for the Conterminous United States (U.S. Geological Survey Open-File Report 95-449, Reston, Virginia).
*Smith, R.A., Alexander, R.B., Tasker, G.D., Price, C.V., Robinson, K.W., and White, D.A., 1993, Statistical Modeling of Water Quality in Regional Watersheds (Proceeding of Watershed '93, A national conference on watershed management, Alexandria, Virginia, March 21-24, 1993, pp. 751-754)
*White, D. A., Smith, R. A., Price, C. V., Alexander, R. B., and Robinson, K. W., 1992, A spatial model to aggregate point-source and nonpoint-source water-quality data over large areas, Computers and Geosciences, v. 18, no. 8, pp. 1055-1073.
|Manual model available=Yes
|Manual model available=Yes
|Model website if any=http://water.usgs.gov/nawqa/sparrow/
|Model website if any=http://water.usgs.gov/nawqa/sparrow/
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|Comments=This form is filled out by Albert Kettner, based on the SPARROW website
|Comments=This form is filled out by Albert Kettner, based on the SPARROW website
}}
}}
{{CSDMS staff part
|OpenMI compliant=No but possible
|IRF interface=No but possible
|CMT component=No but possible
|CCA component=No but possible
}}
{{Start coupled table}}
{{End a table}}
{{End headertab}}
{{{{PAGENAME}}_autokeywords}}
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==Introduction==
==Introduction==


== History ==
== History ==


== Papers ==
== References  ==
<br>{{AddReferenceUploadButtons}}<br><br>
{{#ifexist:Template:{{PAGENAME}}-citation-indices|{{{{PAGENAME}}-citation-indices}}|}}<br>
{{Include_featured_references_models_cargo}}<br>


== Issues ==
== Issues ==


== Help ==
== Help ==
{{#ifexist:Model_help:{{PAGENAME}}|[[Model_help:{{PAGENAME}}]]|}}


== Input Files ==
== Input Files ==


== Output Files ==
== Output Files ==
== Download ==
== Source ==

Latest revision as of 20:18, 16 September 2020



SPARROW


Metadata

Also known as
Model type Single
Model part of larger framework
Note on status model
Date note status model
Incorporated models or components:
Spatial dimensions 2D
Spatial extent Continental, Landscape-Scale, Regional-Scale, Watershed-Scale
Model domain Terrestrial, Hydrology
One-line model description The SPARROW Surface Water-Quality Model
Extended model description SPARROW (SPAtially Referenced Regressions On Watershed attributes) is a watershed modeling technique for relating water-quality measurements made at a network of monitoring stations to attributes of the watersheds containing the stations. The core of the model consists of a nonlinear regression equation describing the non-conservative transport of contaminants from point and diffuse sources on land to rivers and through the stream and river network. The model predicts contaminant flux, concentration, and yield in streams and has been used to evaluate alternative hypotheses about the important contaminant sources and watershed properties that control transport over large spatial scales.
Keywords:

biogeochemistry, water quality,

Name Richard Alexander
Type of contact Model developer
Institute / Organization USGS, NAWQA Hydrologic Systems Team
Postal address 1 12201 Sunrise Valley Drive, MS 413
Postal address 2
Town / City Reston
Postal code 20192
State Virginia
Country United States
Email address ralex@usgs.gov
Phone 703-648-6869
Fax


Name Steve Preston
Type of contact Model developer
Institute / Organization
Postal address 1
Postal address 2
Town / City
Postal code
State
Country United States
Email address spreston@usgs.gov
Phone
Fax


Name Gregory Schwarz
Type of contact
Institute / Organization
Postal address 1
Postal address 2
Town / City
Postal code
State
Country United States
Email address gschwarz@usgs.gov
Phone
Fax


Name Richard Smith
Type of contact
Institute / Organization
Postal address 1
Postal address 2
Town / City
Postal code
State
Country United States
Email address rsmith1@usgs.gov
Phone
Fax


Supported platforms
Windows
Other platform
Programming language

Other program language SAS Macro Language, SAS IML
Code optimized Single Processor
Multiple processors implemented
Nr of distributed processors
Nr of shared processors
Start year development 1992
Does model development still take place? Yes
If above answer is no, provide end year model development
Code development status Active
When did you indicate the 'code development status'? 2020
Model availability As code
Source code availability
(Or provide future intension) 		Through web repository
Source web address http://water.usgs.gov/nawqa/sparrow/
Source csdms web address
Program license type Other
Program license type other NOT SURE
Memory requirements --
Typical run time --


Describe input parameters SPARROW modeling requires the integration of many types of geospatial data for use as explanatory variables which are considered as either constituent sources or delivery factors. Sources might include certain land types such as urban area, or known contaminant sources such as sewage treatment plants. Delivery terms can include any basin characteristic that may be associated with natural attenuation. For example, denitrification is often associated with certain soil characteristics and the spatial pattern of those soil characteristics is often related to that of constituent loads. In some cases delivery terms might also be associated with enhanced delivery. For example, high basin slope might cause more rapid flows which could increase the delivery of constituents. Delivery is also influenced by the water time of travel in streams, which can be estimated from published USGS time-of-travel studies (e.g., Reed and Stuckey, 2001).
Input format ASCII, Binary
Other input format
Describe output parameters SPARROW is designed to describe the spatial patterns in water quality and the factors that affect it. SPARROW models are developed using mass balance constraints to quantify the relation between stream constituent load (the mass of the constituent being transported by the stream) and the sources and losses of mass in watersheds. Thus the models are inherently designed to predict load (mass per time) for all stream reaches in the modeling region. However, the predictions of stream load can be modified to provide a variety of water-quality metrics that can support various types of assessments.

The SPARROW prediction metrics include constituent yields, concentrations, and source contributions to stream loads:

  • Constituent yields
  • Constituent concentrations
  • Source contributions to stream loads
Output format Binary
Other output format
Pre-processing software needed? No
Describe pre-processing software
Post-processing software needed? No
Describe post-processing software
Visualization software needed? No
If above answer is yes
Other visualization software


Describe processes represented by the model --
Describe key physical parameters and equations --
Describe length scale and resolution constraints --
Describe time scale and resolution constraints --
Describe any numerical limitations and issues --


Describe available calibration data sets
Upload calibration data sets if available:
Describe available test data sets
Upload test data sets if available:
Describe ideal data for testing


Do you have current or future plans for collaborating with other researchers? --
Is there a manual available? Yes
Upload manual if available:
Model website if any http://water.usgs.gov/nawqa/sparrow/
Model forum / discussion board --
Comments This form is filled out by Albert Kettner, based on the SPARROW website


This part will be filled out by CSDMS staff

OpenMI compliant No but possible
BMI compliant No but possible
WMT component No but possible
PyMT component
Is this a data component
Can be coupled with:
Model info
Authors
Richard Alexander
Preston, Schwarz, Smith
Source code
Model citations
Nr. of publications: 35
Total citations: 3508
h-index: 21
m-quotient: 0.78
QR-code
Qrcode SPARROW.png
Link to this page
Other models by author



Introduction

History

References



Nr. of publications: 35
Total citations: 3508
h-index: 21
m-quotient: 0.78



Featured publication(s)YearModel describedType of ReferenceCitations
Smith, Richard A.; Schwarz, Gregory E.; Alexander, Richard B.; 1997. Regional interpretation of water-quality monitoring data. Water Resources Research, 33, 2781–2798. 10.1029/97WR02171
(View/edit entry)		1997 SPARROW
 Model overview 666
Alexander, Richard B.; Smith, Richard A.; Schwarz, Gregory E.; Boyer, Elizabeth W.; Nolan, Jacqueline V.; Brakebill, John W.; 2008. Differences in Phosphorus and Nitrogen Delivery to The Gulf of Mexico from the Mississippi River Basin. Environmental Science &amp; Technology, 42, 822–830. 10.1021/es0716103
(View/edit entry)		2008 SPARROW
 Model overview 776
See more publications of SPARROW


Issues

Help

Input Files

Output Files

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