筑後川感潮域における浮遊物質の構成に関する研究
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Suspended matter was sampled using vacuum pump and plankton net. Dry weight and ignition loss were determined for each class of particles. The size, shape and material of particles were analyzed using digital microscope. Large particles over 425 μm consisted of fibered detritus of plant and zoo plankton. The percent composition of fiber reached 95% of total volume. Particles of 106 - 425 μm was consisted of fiber, floc and mineral. The percent composition of fiber was 30% of total volume, floc was 60% and mineral was 10% respectively.The percentage of sand was 40% in total weight, silt and clay in floc was 30%, organic matter in floc was 20%, fiber was 10% respectively. Floc consists of 40% organic matter by weight, and 95% by volume. The effective density of floc was estimated to be 100 kg/m3.
- Japan Society of Civil Engineersの論文
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