ALPMON FINAL REPORT - ARC systems research

Contract ENV4-CT96-0359 ALPMON
land use classes as resulted from the investigations of the LfW in the hilly environment of the Vils test
site (Molnár & Casper, 1998).
Sulm test site
In the Sulm test site, main emphasis was put on the preparation and implementation of additional
information, such as meteorological parameters and soil maps, as well as the performance of ASGI for
a selected time period. The Section of Water Resources of the Austrian Province of Styria was
interested in testing whether the ASGI water run-off model is appropriate for integration into the flood
information service of Styria. An important additional prerequisite of this customer was, that the model
requires only data which are already available for the whole province of Styria, or data which can be
acquired with limited financial and time effort for the whole country (total area of Styria: 16.400 km 2 ).
The result of the Sulm test site study is a complete demonstration of the ASGI water run off model
including a comparison of modelled and measured water run off.
2.3.2.3 Implementation of Remote Sensing into the Model
The programming system ASGI consists of the 4 main modules
� Data management (Datenmanagement)
� Data preparation (Präprozessor)
� Data processing (Prozessor)
� Data presentation (Postprozessor).
The module "Data Management" includes
� the project- and variant specific database management
� the fast input of external data (including data check) and
� the optional data storage and restoration.
This module offers the interface to ALPMON caused by the need for grid-based data. The Bavarian
State Office for Water Resources has the opinion, that the requirements can only be satisfied by using
remote sensing data.
The implementation of remote sensing into the model is provided for the present land use / land cover
information. Looking forward to the high resolution satellite data of the future and the resulting need on
high precision DEM for pre-processing this data, DEM generation from stereo satellite image data is a
second link between ASGI (or more general, water run off models) and remote sensing.
2.3.2.4 Run-off Modelling with ASGI (Sulm Test Site)
The methods described below were selected based on the user requirements and the data layers
needed for the water run-off model. In ASGI a so called ‘pre-processor’ module is used for the
preparation of the spatial and temporal data. This comprises in a first step the conversion of the
various data layers into the formats required by the model.
The structure of ASGI is modular (based on the methods of the WASIM-ETH model), and often several
calculation methods are offered to the user. In the project performed for the Section of Water
Resources of the province Styria following approaches have been used:
� Interpolation of meteorological input data by application of Inverse Distance Weighting Interpolation
(IDW);
� Calculation of potential evaporation after Hamon (Federer & Lash, 1983)
� Estimation of the interception storage capacity dependent on leaf area index and degree of
vegetation coverage, based on the landcover classification results
� Infiltration model after Peschke (1987), based on Green and Ampt (1911)
� Soil model: saturated area approach using the topographic index after Beven and Kirkby (1979).
� Runoff separation into surface runoff, interflow, and baseflow
� Routing of surface runoff by subdivision of the basin into flow time zones combined with a single
linear storage routing.
2.3.2.5 Results from Mangfall Test Site
The results of the investigations delivered to the customer LfW are of two categories:
JR, RSDE, ALU, LMU, Seibersdorf, WSL 33