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Institut für Wasser- und Umweltsystemmodellierung - IWS



"Assessment of fine sediment infiltration into homogeneous idealized sediments in a laboratory flume"

The fine sediment infiltration into interstices of the river bed has many ecological consequences. It influences the infiltration into the ground water, raising the pumping costs for infiltration wells. It also destroys spawning habitats and the decreasing bed roughness leads to higher flow velocities. Up to now, most laboratory investigations of sediment infiltration lead to a destruction of the experiment. This thesis develops a series of experiments to evaluate the suitability of using gamma ray attenuation to assess fine sediment infiltration in an idealized sediment bed in a laboratory flume. Therefore an idealized sediment bed was designed, built out of table tennis balls and installed in a flume. A Matlab program was developed to process the obtained data of measured intensities to compute the infiltrated mass of fine sediments. The experiments are run with three different grain sizes of fine sediment, and for each fine sediment three different amounts were added into the flume to infiltrate. At five different positions along the infiltration zone vertical profiles with the gamma ray attenuation are obtained for each experiment run. later the computed results are compared to conventional obtained results to clarify the quality of the results of the gamma ray attenuation method.