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您的检索式：作者名="Marcel Liedermann"
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| 1 | An integrated suspended sediment transport monitoring and analysis concept显示文摘A new integrated suspended sediment monitoring strategy applying direct and indirect technologies is presented.Optical sensors continuously record the turbidity at one point in the channel cross section close to the river bank and are calibrated by water samples taken close to the sensor.Additionally measurements are performed to establish the distribution of suspended sediment in a cross section(bottle samples combined with acoustic devices).Using correction factors(probe and cross-sectional factor) these monitoring methods are combined and it is,thus,possible to fully document the temporal and spatial variability of the suspended sediment transport and to estimate the suspended sediment load for certain time periods.This monitoring strategy was implemented at various measurement sites in Austria as well as at the Hainburg Road Bridge site on the Danube River.It has already been successfully applied for three years at this measurement site and suspended sediment loads during high discharges up to a 15 year flood event have been monitored.To evaluate the new monitoring methods the results were compared with load estimation methods found in the literature including averaging and ratio estimators as well as rating curves.The results prove that with the new methodology,the temporal variability of the suspended sediment transport can be detected more accurately compared with the other methods.They also demonstrate that the additional consideration of the spatial distribution of the suspended sediment concentration in the cross section is crucial as the mean concentration in the cross section can significantly exceed the concentration near the banks,especially at large rivers like the Danube River. | Marlene HAIMANN Marcel LIEDERMANN Petra LALK Helmut HABERSACK | 2014 | International Journal of Sediment Research2014，29，2： | 4 |
| 2 | Effective transport width——A methodology to describe the spatial variability of bedload transport显示文摘The monitoring of bedload transport processes in rivers is a still challenging task in research and the parameter effective transport width(ETW)allows,for the first time,a process description of the local variability of the bedload transport.In this paper,the distribution of bedload transport over a river crosssection was studied by statistically analyzing long-term monitoring data.Using an innovative integrated measurement system,combining geophones distributed over the river width with bedload traps and basket sampling,allows for continuous,high-resolution,long-term monitoring data of bedload transport characteristics to be generated.Geophone data can be used to record and describe bedload transport processes such as intensity,temporal variability,and local variability.One parameter observed was the ETW,which describes the width where bedload transport is taking place for different discharge classes in gravel bed rivers.With the help of a data series recorded over more than a decade,it is now possible,for the first time,to statistically describe the continuously and directly measured ETW.Hence,it became evident that the effective bedload transport width depends on the discharge rate and local transport capacity,and that bedload transport over the entire river width only occurs at high flows that prevail a few days a year. | Rolf Rindler Sabrina Schwarz Marcel Liedermann Dorian Shire-Peterlechner Andrea Kreisler Johann Aigner Michael Tritthart Helmut Habersack | 2023 | International Journal of Sediment Research2023，38，2： | 0 |
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