gis-based simulation of soil erosion at catchment and ... · the projects „erosion 3d saxony“...

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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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On-site-damages

Motivation Materials & Methods Results Outlook

Foto: Käpermann 2010

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Off-site-damages – Siltation & Eutrophication


Bautzen Reservoir

www.dresden-und-sachsen.de/.../bz_talsperre.jpg

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Erosion event in Waldheim/Saxony 9/4/2008

Processes


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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


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


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EROSION 3D (v. Werner 1995, Schmidt 1996)


• 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


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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Data set – Soil texture


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Data set – Landuse


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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


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Conservation tillage

Data set – Soil management


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Data set – Relief


Höhe ü. NN [m]60

1220

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Data set – Rainfall regions


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


Clipping

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Spatial distribution of soil loss

EROSION3D


Dresden

Leipzig

Chemnitz

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Plausibility check


Großhardtmannsdorf, Erzgebirge

Grid cell: 20*20m

Z-factor: 5

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Plausibility check


Worst-Case-Scenario

Rainfall event: 10 y. rec. intervall

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Plausibility check


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


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


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Limitations


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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TECHNISCHE UNIVERSITÄT BERGAKADEMIE FREIBERG

Thank you for your attention!

The projects „Erosion 3D Saxony“ & „Phosphorous inputs in surface waters in Saxony“ where

founded by Saxonian State Ministry for Environment and Agriculture.

gis-based simulation of soil erosion at catchment and ... · the projects „erosion 3d saxony“...

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