Soil Erosion Network: Model Metadata
NORGUL -Water and Thermoersosion

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1 Model identification Soil Erosion Network - Model
1.1 Model name
1.2 Most recent version 3.2
1.3 Date of release December 1994
2 Water erosion
3 Contact person
3.1 Name Prof.A.Sidorchuk
3.2 Address Lab of Soil Erosion and Fluvial Processes,Geographical Faculty, Moscow State University, 119899 Moscow, Russia
3.3 Tel +7 095 9395697
3.4 Fax +7 095 9328836
3.5 Email  
4 Model Author(s) Professor A. Sidorchuk
5 Model components
5.1 Water erosion and thermoerosion: Based on sediment budget equation
5.2 Wind erosion: No
5.3 Hydrology: Simulated or observed hydrograph
5.4 Site/topography: Initial slope longitudinal profile
5.5 Plant growth: No
5.6 Management: No
5.7 Soil: Multiple layers
5.8 Chemistry: No
5.9 Weather: For used hydrological model
6 Model characteristics
6.1 Spatial
6.1.1 Class of area: Catchment
6.1.2 Flow routing system: Streamline
6.1.3 Minimum area: Point
6.1.4 Maximum area: No limit, in practice about 10-50 km
6.2. Temporal
6.2.1 Timestep: Daily and less
6.2.2 Single or multiple event? Multiple
6.2.3 Maximum simulation duration: 30-50 years
7 Model's representation of processes
7.1 Water erosion processes
7.1.1 Interrill: No
7.1.2 Rill: Modelled at the upper part of catchment
7.1.3 Gully: The main model
7.1.4 Streambank: In form of mass movement on the gully sides
7.1.5 Deposition: Modelled with low accuracy, better to exclude
7.2 Wind erosion processes: No
7.2.1 Creep/surface roll:
7.2.2 Saltation:
7.2.3 Suspension
7.3 Hydrological processes: Simulated separately
7.3.1 Evaporation/transpiration:
7.3.2 Runoff:
7.3.3 Infiltration
7.3.4 Subsurface flow:
7.3.5 Return flow
7.4 Plant processes:
7.4.1 Light interception and photsynthesis: No
7.4.2 Dry matter and residue
7.4.3 Root growth:
7.4.4 Pests:
7.4.5 CO2 sensitivity:
7.5 Soil: Multiple layer system; properties changes when layer eroded away
7.5.1 Crust development
7.5.2 Aggregate properties
7.6 Chemistry: No
7.6.1 Nutrients:
7.6.2 Carbon
7.6.3 Pesticides
7.6.4 Other contaminants
7.7 Weather: No
7.8 Other: 1. Stable gully cross-section profile is modelled after each hydrological event

2. The critical velocity of erosion initiation is calculated, mainly for the upper soil layer with vegetation cover and residue

3. The process of thermoerosion is simulated for the period of negative temperatures of the eroded layer.

8 Input Data (* = Mandatory)
8.1 Weather: Row of the air temperature for the thaw period
8.2 Soil: Erosivity coefficient (not from USLE) for each soil layer: water resistant soil aggregates diameter mean soil particles diameter cohesion angle of internal friction density porosity elevations of top surface of soil layer (longitudinal profile) roughness coefficient (after Manning)

Erosivity coefficient (not from USLE) for each soil layer: coefficient of the thermoerosion; coefficient of temperature conductivity; water resistant soil aggregates diameter; mean soil particles diameter; cohesion; angle of internal friction; density porosity; ice content; elevations of top surface of soil layer (longitudinal profile); roughness coefficient (after Manning)

8.3 Hydrology: Row of specific discharge values for the thaw period and warm period
8.4 Plant cover: No
8.5 Soil surface cover: Density of the grass roots in the upper soil layer
8.6 Management: No
8.7 Topography/site characteristics: = Longitudinal profile in elevationsalong initial streamline; -catchment area change along this line
8.8 Micro-topography: No
8.9 Other 1. Empirical relation between flow width and discharge

2. Empirical relation between stable gully bottom width and discharge

9 Output data Gully longitudinal profile evolution during the simulation period in hydrological event resolution listing of:
- for each event number of erosion episodes and thermoerosion episodes

- elevations of bottom surface along the gully
- gully depth along the gully
- gully bottom and top width along the gully
- gully volume along the gully

10 Programming language FORTRAN-90
11 Computer requirements Any with FORTRAN translator
12 Documentation
12.1 Scientific documentation: A. Sidorchuk (in press) Gully erosion and thermoerosion on the Yamal Peninsula.
12.2 User's guide: In FORTRAN listing comments
12.3 Technical documentation: Reports in Russian
13 Availability On request from author
14 Other Relevant Information No

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