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Suspended Sediment Rating Curve of the Yangtze (Changjiang) River: Characteristics, Interpretations and Practices

Author: YuFengLing
Tutor: ChenZhongYuan
School: East China Normal University
Course: Physical Geography
Keywords: River water and sediment model Spatial and temporal heterosexual Sediment flux Hydrogeology and Geomorphology Yangtze River
CLC: P333.4
Type: Master's thesis
Year: 2006
Downloads: 287
Quote: 1
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Abstract


Water and sediment relational model, index relationship between flow rate (Discharge, Q) and suspended sediment concentration (Suspended Sediment Concentration, SSC): SSC = AQ b , at home and abroad, small rivers has been widely used. Yangtze River Runoff and Sediment on the relational model, whether in scientific research or construction have important theoretical and practical significance. Practice has proved that the model of water and sediment relations in a wide range of application of the Yangtze River basin, the main reason may be due to the complex climate and geomorphological features of the area. This thesis in the database on the basis of long-term observations of water and sediment characteristics of the Yangtze River Runoff and Sediment on the relational model spatial and temporal distribution and the formation mechanism of the preliminary discussion, aimed at a better understanding of the model of the formation mechanism and its application. This thesis based on the Cuntan Wanxian, Yichang, Zhijiang, the new plant, Jianli, Luoshan, Chenglingji, Hankou and Chase 10 hydrological stations 1950-1988 daily water and sediment data and measured water and sediment data, the establishment of Sediment Models on different time scales (seasonal, annual and decade-by-model; year measured and time scales measured model). According to the daily water and sediment data to establish a year-round calendar of each station model and statistical model correlation coefficient (R 2 ), model coefficients b, lg (a) Spatial and temporal distributions. This paper argues that the spatial and temporal distribution of water and sediment relational model, mainly affected by the impact of climate in the catchment and river geomorphological features: 1) upstream of the main stream (the Three Gorges river) water and sediment model showed a high correlation, R 2 in 0.85-0.90 above, is generally higher than in the Yangtze River, downstream model; performance of high b-value, low-lg (a) the value of the characteristics of the model coefficients (b> 1.600 lg (a) <-4.000). This paper argues that this is closely related to the erosion of bedrock channel upstream \Upstream riverbed gradient (10-40 × 10 -5 ), deep narrow river development (river width is less than 800 meters water depth greater than 50 meters). To reflect the upstream river erosion, transportation role-based, thus ensuring the suspended sediment concentration and flow changes consistency. 2) mainstream, the correlation is not as good as the upstream of the downstream section of water and sediment model, except Chenglingji and Luoshan, the rest of each station R 2 0.75. Chase coefficient b value of from Zhijiang 1.600 to 0.900, lg (a) the value of the contrary from -4.000 to -1.000. This is due to the Yangtze River, downstream riverbed gradient slowed down significantly, were 2-3 × 10 -5 and 0.5-1.0 × 10 -5 . Riverbed cross-sectional form of erosion and deposition in the the Zhijiang station and the new plant station coexistence of quasi-U-type \Reflect the enhanced the silting role downstream direction, the relationship between water and sediment match is poor. 3) City screw segment is based on water and sediment relations most significant river. R 2 Chenglingji only 0.0542, and shows the phenomenon of suspended sediment concentration with the flow decreases. In addition, the coefficient b is the smallest of all hydrological stations, lg (a) reaches the maximum. Rose to 0.4661 to the the Luoshan station R 2 . City snails segment reflects the relationship between water and sediment of the Dongting Lake and the Water and Sediment gentle river bed slope. Climatic conditions also significantly affected the water and sediment model. Affected by the monsoon rains, the Yangtze River runoff and sediment has Ming

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CLC: > Astronomy,Earth Sciences > Geophysics > Hydrological Sciences (water sector physics) > Hydrological analysis and calculation > Analysis and calculation of sediment
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