Analysis Of Sediment Characteristics In Songnen River

The need for the use of water resources in social development and human needs cannot be ignored.With the continuous advancement and development of society and industry,the demand for water resources is increasing,and the balance between finding river resources and demand has become Important topic.A large amount of sediment exists in the river system,and the sediment is an important part of the river's self-regulation.Therefore,this paper takes the Songnen River as the main body to explore the relationship between sediment particle size analysis,gravity,hydraulic power and physical characteristics of fine sediment.The main research contents of this thesis are as follows:(1)Sediment particle collection and statistical sorting were carried out on eight hydrological stations of Songnen River,Jiangqiao,Harbin,Jiamusi,Guchengzi,Chenming,Yanshou,Nancha and Tieli.(2)Conducting analysis of sediment geometry,dividing the eight stations into dry tributary stations,analyzing sediment particle size parameters,using Collias moment method,Mcmanus moment for average particle size,sorting degree,skewness and kurtosis The method and the Folk-Ward graphical method are used to solve the statistics of the trend change analysis by the characteristic particle diameters D10,D50 and D90.(3)Correlation analysis between the same parameters and different parameters for the three methods,the interchangeability between the same parameters,the applicability of the analysis methods between different parameters,the comparison of the results by box plots,the use of gray correlation.The theory validates the results of the correlation analysis.The main particle size distribution frequency curve is drawn,and the particle size parameters are described.Through comparative analysis,the particle size parameter analysis method most suitable for the Songnen River is determined.(4)Analysis of sedimentgravity characteristics and hydraulic characteristics by physical characteristics of fine sediment particles,mainly for sediment settlement,underwater angle of repose,dry bulk density and specific surface area analysis.For the sedimentation speed,the corresponding models in each movement state are solved by stokes,Zhang Jinui,Gangchalov,Wushui and Shayuqing,and the unified formula of each district is used to verify to solve the sediment settlement most suitable for the Songnen River of speed modelThe results show:(1)The main stream of the Songnen River: Jiangqiao-Harbin-Jiamusi,the particle size is thicker,the tributary station,the iron force station has the coarsest particle size,followed by the Chenming station,the Yanshou and Nancha station size.Similar,the smallest ancient city sub-station,the particle size parameters are solved,the positive and negative bias characteristics and the average particle size trend are consistent with the statistical values.(2)The Collias moment method,the Mcmanus moment method and the Folk-Ward diagram method are used to compare the sediment parameters with different parameters.Comparing the Collias moment method with the Folk-Ward graphical method,the average particle size and the sorting degree are strongly correlated,and the two correlations between the skewness values are negatively correlated.It is not recommended to exchange for the low correlation of the kurtosis.For the comparison between the Mcmanus moment method and the Folk-Ward diagram method,there is a strong correlation between the average particle size and the sorting degree.The results of the two granularity parameters of the skewness and the kurtosis indicate that both are negative.Related,not interchangeable.For the correlation analysis between different parameters,the Collias moment method,the Mcmanus moment method and the Folk-Ward diagram method are used to compare the average particle size and the skewness.The results show that the Collias moment method and the Mcmanus moment method are used.There is no correlation between the two,and the Folk-Ward graphical method is moderately correlated.Between the difference between the sorting and the average particle size,the moment method and the Folk-Ward diagram method are applied,and the two correlations are extremely weakly correlated or uncorrelated.In the comparison between the kurtosis and the sorting degree,the Collias moment method,the Mcmanus moment method and the Folk-Ward diagram method are also compared.The results show that the Collias moment method is not related to the Folk-Ward diagram method.The Mcmanus method is highly correlated.By distributing the frequency curve and comparison,the results show that the Folk-Ward graphical method is more suitable for the analysis of the grain size parameters of the Songnen River.The correlation degree and the correlation coefficient trend obtained by the grey correlation degree theory are basically the same,and the correlation results can be proved.(3)For the dry weight of the sediment,the dry bulk density and the characteristic particle size D50 have a good exponential relationship.The underwater angle of repose has a good linear relationship with the uneven coefficient,and the specific surface area has a good exponential relationship with the characteristic particle size D50.The sediment speed is more suitable for the Wushui model in the laminar flow zone,and is more suitable for the Gangchalov model in the transition zone.