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Marcus Schindewolf Agricolastraße 22 I 09596 Freiberg
Tel. 0 37 31/39-2679 I Fax 0 37 31/39-2502 I I www.tu-freiberg.de
GIS-based simulation of soil erosion
at catchment and regional scale
TECHNISCHE UNIVERSITÄT BERGAKADEMIE FREIBERG
Marcus Schindewolf & Jürgen Schmidt
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Off-site-damages – Siltation & Eutrophication
Motivation Materials & Methods Results Outlook
Bautzen Reservoir
www.dresden-und-sachsen.de/.../bz_talsperre.jpg
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Erosion event in Waldheim/Saxony 9/4/2008
Processes
Motivation Materials & Methods Results Outlook
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process based vs. empirical
high data demand low data demand
easy parameterization
time saving
catchment scale regional scale
complex parameterization
time consuming
Erosion models
Motivation Materials & Methods Results Outlook
USLE
MUSLE
AGNPS
WEPP
EROSION 3D
LISEM
EROSION 3D
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1. Provision of an area-wide model input data set
2. Development of a GIS-based parameterization interface
3. Simulation of soil loss and deposition with EROSION 3D
ZieleObjectives
Motivation Materials & Methods Results Outlook
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EROSION 3D (v. Werner 1995, Schmidt 1996)
Motivation Materials & Methods Results Outlook
• event based
• grid oriented
• compatible with GIS
Infiltration-/
Overland flow model Erosion model
Rainfall
Infiltration
Overland flow
Detachment Transport
Deposition
Sediment yield
(Green & Ampt approach) (Momentum flux approach)
• extensivly validated
• modular structure
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Study Area
Motivation Materials & Methods Results Outlook
Federal state of Saxony
location: East Germany
area: 18.500 km²
topography: 100-1200m a. s. l.
mean annual rainfall: 550-1100mm
60% of the farmlands are endangerd by erosion
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Beans
Peas
Forest
Wood stripes
Meadow
Oat
Corn
Carrot
Rape
Beet
Ruderal vegetation
Sommer barley
Sommer wheat
Potatos
Winter barley
Winter rye
Winter wheat
Sealed area
Water
Data set – Crop type
Motivation Materials & Methods Results Outlook
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Data set – Rainfall regions
Motivation Materials & Methods Results Outlook
Rainfall regions
Leipziger Land
Torgauer Land
Dresdner Elbtalgebiet
Oberlausitz
Sandsteingebirge und Lausitz
Vogtland
Unteres Erzgebirge
Oberes Erzgebirge und Vogtland
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Parameterization interface
Watersheds
Soil map Land use map Field crop map Management Relief Rain
ID-Grid Parameter
table
Database PROCessor (DPROC)
EROSION
3D
Output
maps
Gridding
Database queries
Parameter
data base
Derving upstream catchments
Area
of interest
Motivation Materials & Methods Results Outlook
Clipping
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Spatial distribution of soil loss
EROSION3D
Motivation Materials & Methods Results Outlook
Dresden
Leipzig
Chemnitz
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Plausibility check
Motivation Materials & Methods Results Outlook
Großhardtmannsdorf, Erzgebirge
Grid cell: 20*20m
Z-factor: 5
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Plausibility check
Motivation Materials & Methods Results Outlook
Worst-Case-Scenario
Rainfall event: 10 y. rec. intervall
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Plausibility check
Motivation Materials & Methods Results Outlook
Point of view
Direction of view
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Comparison with existing Invesigations
EROSION 3D
PESERA (Kirkby et al. 2004)
USLE(LfUG 2006)
Erosion risk
without
very low
low
medium
high
very high
Motivation Materials & Methods Results Outlook
different input data
grid cell 1*1 km
lack of process description
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Conclusion
Fast and easy parameterization in the catchment
and regional scale
Provision of reliable results for risk area detection
Quality enhancement compared to former area wide
model applications
Motivation Materials & Methods Results Outlook
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Limitations
Motivation Materials & Methods Results Outlook
Result quality is strongly related to data quality
and data availability
Special issues need complex data aquisition,
data preprocessing and special model applications
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