The principle, method and mersuring equipment in studying siltaton in the Lianyun Harbor by using the γ-ray density gauge are described in this paper. From field observation and analyses, some primary principles conc...The principle, method and mersuring equipment in studying siltaton in the Lianyun Harbor by using the γ-ray density gauge are described in this paper. From field observation and analyses, some primary principles concerning the infill rate, the distribution of silt density with depth and the consolidation rate and change of the shear strength of the silt have been found out.展开更多
The production of fine sediments coated with radioisotopes to act as a tracer in studying the movement of dredging spoil involves some physical and chemical treatment of the sediment. The treatment can affect the elec...The production of fine sediments coated with radioisotopes to act as a tracer in studying the movement of dredging spoil involves some physical and chemical treatment of the sediment. The treatment can affect the electrochemical properties of the sediment and hence its behaviour in fresh and saline water. The effect of these changes on the degree of flocculation of the sediment has been studied by measuring the fall velocity distribution in a 4.4m settling column. The results of these tests show that the coating of inactive gold or silver on to natural sediment without any other pretreatment results in a tracer sediment having fall velocities similar to those of natural sediment. Other pretreatments result in variations in the fall velocity distributions owing to different degrees of flocculation induced by the chemical treatments. An artificial sediment consisting of finely ground scandium glass was also tested for comparison.展开更多
文摘The principle, method and mersuring equipment in studying siltaton in the Lianyun Harbor by using the γ-ray density gauge are described in this paper. From field observation and analyses, some primary principles concerning the infill rate, the distribution of silt density with depth and the consolidation rate and change of the shear strength of the silt have been found out.
文摘The production of fine sediments coated with radioisotopes to act as a tracer in studying the movement of dredging spoil involves some physical and chemical treatment of the sediment. The treatment can affect the electrochemical properties of the sediment and hence its behaviour in fresh and saline water. The effect of these changes on the degree of flocculation of the sediment has been studied by measuring the fall velocity distribution in a 4.4m settling column. The results of these tests show that the coating of inactive gold or silver on to natural sediment without any other pretreatment results in a tracer sediment having fall velocities similar to those of natural sediment. Other pretreatments result in variations in the fall velocity distributions owing to different degrees of flocculation induced by the chemical treatments. An artificial sediment consisting of finely ground scandium glass was also tested for comparison.
