Author(s): A. M. A. Mayar; M. Noack; S. Wieprecht

Linked Author(s): Markus Noack, Silke Wieprecht

Keywords: Fine sediment infiltration; Gamma ray attenuation; Undisturbed measurement; Riverbed clogging

Abstract: This study presents results of preliminary experiments for an undisturbed measurement method for the assessment of fine sediment infiltration masses based on Gamma Ray Attenuation. Fine sediment infiltration into interstices of a riverbed has been investigated intensively in both laboratory and field experiments given to the immense impact on riverine ecology. The clogged pores influence the exchange between surface water and groundwater and alter interstitial habitats for benthic organisms but also for the reproduction habitats of gravel-spawning fish. The infiltration of fine sediments and subsequent accumulation in the pores reduces the pore space and thus the hydraulic conductivity of the river. So far, most laboratory investigations measured sediment infiltration masses using destructive methods, which allow only the assessment of fine sediment infiltration masses at the end of experiments but not to investigate the dynamic behaviour of clogging processes. The focus of this study is to investigate the feasibility of Gamma Ray Attenuation (GRA) for undisturbed measurements of infiltration masses. Therefore, preliminary experiments are conducted to optimize operational parameters and to test the accuracy of the GRA-method in determining fine sediment infiltration masses.

DOI: https://doi.org/10.3850/978-981-11-2731-1_040-cd

Year: 2018