REMM: Riparian Ecosystem Management Model

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REMM Riparian Ecosystem Management Model

• USDA-ARS, Southeast Watershed Research Laboratory
  Tifton, GA

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Collaborators

• Richard Lowrance
• Randall G. Williams
• Lee Altier
• Shreeram Inamdar
• David Bosch
• Joseph M. Sheridan
• Dan Thomas
• Robert K Hubbard
• Carrie Graff
• Jennifer Gilberts

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I. Riparian Buffer Overview
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Coastal Plain Agricultural Riparian Buffer
System
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Landscape Management
Riparian Herbaceous Buffer
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II. REMM Concepts
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Three Zone Buffer System
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REMM Components
vegetative growth
hydrology
nutrient dynamics
sediment
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REMM Hydrologic Processes
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Litter and Soil Interactions in REMM
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REMM Vegetation Types
coniferous trees
deciduous trees
herbaceous perennials/ annuals
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REMM Vegetation
Upper canopy/lower canopy
Multiple vegetation types in both canopies based
on percent cover Any/all vegetation can be in
each zone
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Carbon Pools in Soil and Litter
Based on Century model, Parton et al. 1987
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Nitrogen Pools in Soil and Litter
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Fluxes Among Nitrogen Pools
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Phosphorus Pools in Soil and Litter

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Fluxes Among Phosphorus Pools
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III. Gibbs Farm Experiment
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Managed Three Zone BufferGibbs Farm Site
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Field Surface area 0.32 ha Field Subsurface
area 0.32 ha
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Model Predicted and Observed Water Tables 1995
Zone 1 Well
0
80
-0.5
60
Depth Below Surface (m)
Daily Rainfall (mm)
-1
40
-1.5
20
-2
0
0
100
200
300
400
Days
predicted
observed
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REMM Documentation

• Published as USDA Conservation Research Report
  No. 46 in 2002.
• General article on REMM structure with some
  sensitivity analysis in JSWC
• REMM tested (validation) in two articles in
  Trans. ASAE
• Applications of REMM for coastal plain systems
  published in JAWRA and Trans. ASAE

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IV. Uses for REMM
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IV. Uses for REMM

• Evaluation of Buffer scenarios
• Compare buffers with different vegetation
• Predict changes in pollutant removal mechanisms
• Examine behavior of riparian systems as
  represented by REMM

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Example - Buffer Scenarios

• 14 buffers ranging from minimum Zone 1 buffer (5
  m) to 52 m three zone buffer
• Simulated both conventional row crop loading
  (normal) and dairy lagoon effluent loading
  (high).

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Loading Scenarios
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Buffer Scenarios
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Total Water Output
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Sediment Output
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Total N Output
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Total N load reduction
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V. Limitations
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VI. Limitations

• Soil information for each soil layer in each
  zone.
• Vegetation information by plant part.
• Daily weather and field sediment, nutrient,
  surface and subsurface runoff.

• Data intensive

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VI. Limitations

• Requires another model or real data to develop
  field input files.

• Data intensive
• Field input

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VI. Limitations

• Steam does not control REMMs subsurface flow.
• Flooding in buffer not simulated.

• Data intensive
• Field inputs
• Stream output

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VI. Limitations

• Simple input file editors.
• Output to comma separated file.
• User required to analyze data in spreadsheet.

• Data intensive
• Field inputs
• Stream output
• No real user interface

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VII. Linking REMM with other Models

• GLEAMS/CREAMS

• GLEAMS/CREAMS used to generate REMM daily field
  input files.
• Problem 1 Required manual construction REMM
  field inputs using spreadsheet.
• Problem 2 Required assumption of for of N and P
  transport.
• Problem 3 No stream routing.

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VII. Linking REMM with other Models
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VII. Linking REMM with other Models

• GLEAMS/CREAMS
• AnnAGNPS

• AnnAGNPS used to generate REMM daily field input
  files.
• Problem 1 Required manual construction of REMM
  field inputs using spreadsheet.
• Problem 2 Required assumption of for of N and P
  transport.
• Problem 3 No stream routing.

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VII. Linking REMM with other Models

• GLEAMS/CREAMS
• AnnAGNPS
• AnnAGNPS

• AnnAGNPS used to generate REMM daily field input
  files.
• AnnAGNPS output code modified to ouptut in REMM
  input formats.
• Problem 1 Required assumption of form of N and P
  transport.
• Problem 2 No stream routing.

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VII. Linking REMM with other Models

• GLEAMS/CREAMS
• AnnAGNPS
• AnnAGNPS
• SWAT

• GIS wrapper put around SWAT and REMM. SWATs
  subbasin output used to generate REMM input
  files. REMM output data written back to SWAT
  reach input files.
• Problem Required assumption of form of N and P
  transport

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VII. Linking REMM with other Models

• GLEAMS/CREAMS
• AnnAGNPS
• AnnAGNPS
• SWAT
• CONCEPTS

• REMM and CONCEPTS were integrated on a daily time
  step basis.
• Problem 1. REMM input data file.
• Problem 2. No feedback to REMM on stream
  conditions.

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VII. Linking REMM with other Models

• GLEAMS/CREAMS
• AnnAGNPS
• AnnAGNPS
• SWAT
• CONCEPTS
• AnnAGNPS

• Direct integration of REMM and AnnAGNPS is being
  evaluated. AnnAGNPS field output would be REMM
  inputs and REMM output would be routed through
  AnnAGNPS channel routing scheme.
• Problem 1. Time.

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VIII. Summary
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IX. Contact Information

• Randy Williams
• Agricultural Engineer
• USDA-ARS
• Southeast Watershed Research Lab
• 2375 Rainwater Rd.
• P.O. Box 748
• Tifton, GA 31793
• Phone [phone]
• Fax [phone]
• e-mail randy.williams_at_ars.usda.gov