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Form induced stresses over rough gravel-beds

Aberle J., Koll K., Dittrich A.

Acta Geophysica

2008

Vol. 56, no. 3

584-600

This paper presents an analysis of spatial flow heterogeneity over rough gravel beds for shallow flows in terms of form induced stresses. Data from experiments specifically designed with the intention to analyze the flow data with the double-averaging methodology are used to investigate the nature of form induced stresses. It is shown that spatial flow heterogeneity is small at greater distances to the roughness tops (z 100), increases slightly towards z 100, and increases significantly below z 100. Form induced stresses determined over the same bed and with the same slope are found to be independent of discharge. The influence of the number of measuring verticals on the magnitude of form induced stresses is discussed. The distributions of form induced stresses - are used to define the geodetic level of the roughness crest for rough, irregular beds from hydraulic data.

Sediment budget of a heathland sand-bed river

Schulte-Rentrop A., Koll K., Aberle J., Dittrich A.

Acta Geophysica Polonica

2005

Vol. 53, nr 4

553-565

The paper presents methodologies to quantify sediment sources in order to determine the sediment budget of a river. The methods are applied to assess the morphological state of the heathland River Wuemme. The results emphasize that de-tailed knowledge of the sediment budget is a prerequisite for the development of successful river restoration strategies.