"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.