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CATCHmENT-WIDE, SECTIONAL AND LOCAL ASPECTS IN SEDImENT TRANSPORT mODELLING AND mONITORING

International Journal of Sediment research 1997年第3期 120-130页

作者： helmut m.habersack research assistant, institute for water management, hydrology and hydraulic engineering, universitaet fuer bodenkultur, muthgasse 18, 1 190 vienna, austria

The aim of this paper is to analyse the relevance of different scales for the methods and reliability of sediment transport modelling and monitoring techniques. Both deterministic as well as stochastic approaches allow to derive specific results in different scales whereaby the deterministic, physically based methods are mostly limited to local and sectional aspects. The larger the scale becomes the more stochastic compnents enter the system. At the same time basic features in the larger scales line catchments show a fractal nature and a scale independent behaviour. Throughout the paper a framework for sediment transport modelling and monitoring in different scales is discussed. Starting with catchment-wide analysis using optimal channel network (OCN-) techniques etc. based on digital elevation maps (DEms) a downscaling process leads to the analysis of local structures like meander-modelling. Based on the point- and local scale an upscaling procedure allows to derive overall conclusions for the catchment and management measures.

关键词： Sediment transport River morphology Geomorphology Scaling

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CATCHmENT-WIDE ANALYSIS OF THE SEDImENT REGImE WITH RESPECT TO RESERVOIR SEDImENTATION

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International Journal of Sediment research 2001年第2期16卷 159-169页

作者： helmut m. habersack1 ,Konrad BOGNER1, Josef SCHNEIDER1 and michael BRAUNER2 1Department of water management, hydrology and hydraulic engineering, University of Agricultural Sciences vienna, muthgasse 18, 1190 vienna, austria. 2Department of Forest and Department of water management Hydrology and Hydraulic Engineering University of Agricultural Sciences Vienna Muthgasse 18 1190 Vienna Austria Department of Forest and mountain Risk engineering University of Agricultural Sciences Vienna Pater Jordanstrasse 82 1190 Vienna Austria

The aim of this paper is to discuss a catchment-wide approach for analysing the sediment regime with respect to reservoir sedimentation, based on the Alpine Solk-basin in austria. On a scaling perspective the boundary conditions and major processes of a catchment, like the geomorphological setting, axe given by longterm developments. On the basis of field mapping these effects are discussed with respect to sediment availability, being affected e.g. by deep-seated gravitational slope deformations and slope creeping. Within these longterm processes, short-term unsteady sediment supply, erosion, transfer, deposition and remobilization processes determine reservoir sedimentation and management. An intensive field monitoring program, including bedload and suspended sediment measurements, supplies data for the subsequent rainfall-runoff-erosion and sediment transport modeling (input, calibration and validation data). Instead of aiming to predict sediment transport processes in a purely deterministic manner the use of stochastic concepts allows to define locations in the catchment with a high probability for delivering significant amounts of sediments to the channels and finally the reservoir. Results show that landuse, channel regulation and avalanches are of great importance for sediment supply and that catchment management (beside managing the reservoir itself) has to address these.

关键词： Reservoir sedimentation Erosion modeling Sediment load watershed management

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