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Title: Sediment sorting by hopper dredging and pump-out operations : sampling methods and analysis
Authors: Bryant, Duncan B.
Priestas, Anthony M.
Smith, S. Jarrell
Brutsche, Katherine E.
Keywords: Dredges
Lake sediments
Marine sediments
Particle size determination--Sampling
River sediments
Sedimentation analysis
Publisher: Coastal and Hydraulics Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Technical Report (Engineer Research and Development Center (U.S.)) ; no. ERDC/CHL TR-20-15
Abstract: Hopper dredging operations for beach and nearshore placement typically include periods of overflow, which produces some degree of separation between the size fractions of the dredged sediment. The degree of separation and the controlling factors are presently poorly known. This report focuses on laboratory experiments aimed at determining (1) suitable sampling methods on a dredge, (2) composite sampling techniques to reduce analysis cost, (3) associated sampling intervals to achieve suitable sediment representation of a hopper load, and (4) a hydraulic means of sample splitting. Results showed that no statistical difference exists among the three methods used to sample the hopper weir overflow. The method used to sample deposited hopper sediment identified a bias in the percent fines that resulted from flow sheltering. Further, it was found that composited samples were able to quantify the concentration and percent fines accurately, although an analytical data experiment showed that the accuracy of a composited sample is dependent on the sampling intervals. The accuracy of the fines and concentration from a hydraulic sample splitter was found to be dependent on median grain size, with fine sediment being evenly distributed and coarser sediment increasing the error in concentration and grain size distribution.
Description: Technical Report
Gov't Doc #: ERDC/CHL TR-20-15
Rights: Approved for Public Release; Distribution is Unlimited
Size: 59 pages / 4.46 MB
Types of Materials: PDF
Appears in Collections:Technical Report

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