Soil Erosion Network: Model Metadata
MEDRUSH -Water ersosion

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1 Model identification Soil Erosion Network - Model
1.1 Model name MEDRUSH -Water ersosion
1.2 Most recent version 0.1
1.3 Date of release Still under development, hopefully late 1995
2 Water erosion
3 Contact person
3.1 Name Mike Kirkby
3.2 Address School of Geography, University of Leeds, Leeds LS2 9JT
3.3 Tel +44 113 233 3310
3.4 Fax +44 113 233 6758
3.5 Email
4 Model Author(s) M D McMahon, M J Kirkby, J B Thornes, J.C Bathurst F I Woodward
5 Model components
5.1 Water erosion: Water and sediment routed over rough surface
5.2 Wind erosion: -
5.3 Hydrology: Infiltration into rough surface, overland flow and network routing, lumped soil based on modified TOPMODEL
5.4 Site/topography: DEM
5.5 Plant growth: Models for uncultivated annuals, grass and shrubs
5.6 Management:
5.7 Soil: Dynamic change with erosion in armour and composition
5.8 Chemistry: Organic soil component using C budget
5.9 Weather: Automatic Weather station data (5-15 minute) or generator from available data or scenario
6 Model characteristics
6.1 Spatial
6.1.1 Class of area: Catchment
6.1.2 Flow routing system: Stream network
6.1.3 Minimum area: Erosion plot
6.1.4 Maximum area: 5000 km2
6.2. Temporal
6.2.1 Timestep: Hourly
6.2.2 Single or multiple event? Multiple
6.2.3 Maximum simulation duration: 100 years
7 Model's representation of processes
7.1 Water erosion processes
7.1.1 Interrill: Included in spectrum of surface roughness
7.1.2 Rill: Ditto
7.1.3 Gully: Ditto
7.1.4 Streambank: Ditto for rills and gullies. Major channel modelled via hydraulic geometry and generated flood frequencies
7.1.5 Deposition: Included in integrated sediment routing
7.2 Wind erosion processes:
7.2.1 Creep/surface roll:
7.2.2 Saltation:
7.2.3 Suspension
7.3 Hydrological processes:
7.3.1 Evaporation/transpiration: Modified Penman, allowing for soil layers, plant stress etc. or simpler, depending on data availability. At worst, from temperatures or radiation!
7.3.2 Runoff: Overland flow routing over rough microtopography. Linearised network routing, incorporating hillslope contributions
7.3.3 Infiltration Spatially variable using simplified single layer model, linked to TOPMODEL subsurface flow component
7.3.4 Subsurface flow: TOPMODEL
7.3.5 Return flow ditto
7.4 Plant processes:
7.4.1 Light interception and photsynthesis: Beer's law
7.4.2 Dry matter and residue Based on photosynthesis and transpiration; leaf fall etc.
7.4.3 Root growth: Functional-group based partition of net growth with stems
7.4.4 Pests:
7.4.5 CO2 sensitivity: Implicit in water stress photosynthesis calculations
7.5 Soil: Single layer, with rate of change parameters to allow for erosion and organic matter
7.5.1 Crust development Not modelled for stony soils
7.5.2 Aggregate properties -
7.6 Chemistry: Only for carbon
7.6.1 Nutrients:
7.6.2 Carbon Used in logging organic soil accumulation, mixing decomposition
7.6.3 Pesticides
7.6.4 Other contaminants
7.7 Weather: Stochastic generator used for future scenarios
7.8 Other:
8 Input Data (* = Mandatory)
8.1 Weather: Hourly (or stochastic generator) for Precipitation*, temperature, net radiation, humidity, wind speed (AWS data) - enough to generate evapotranspiration *
8.2 Soil: Grain size* including stoniness*, and rates of change with depth
8.3 Hydrology: Infiltration curves*
8.4 Plant cover: % shrub, grass*, annuals* and bare*, with detail as available
8.5 Soil surface cover: Surface stoniness*, vegetation crown cover by functional; type
8.6 Management:
8.7 Topography/site characteristics: = DEM*, and some of land use, lithology, soil type etc.
8.8 Micro-topography: RMS roughness related to gradient, lithology and land use
8.9 Other Physiological characteristics of dominant plants in each functional group
9 Output data Runoff, soil moisture profiles, sediment transport and net erosion/deposition for subcatchments (of 1-20 km2), integrated over selected time intervals. Vegetation and organic soil biomass, surface roughness and armour characteristics over time. Generalised within sub-catchments
10 Programming language C++
11 Computer requirements HP/Sun work-station or equivalent
12 Documentation
12.1 Scientific documentation: Interim project reports only to data-available from author
12.2 User's guide: Not yet available
12.3 Technical documentation: Not yet available
13 Availability Not yet available
14 Other Relevant Information Currently still undergoing development

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