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The Change Laws of the Water and Sediment Fluxes into the Changjiang River Estuarine

Author: MaCuiLi
Tutor: ShenHuanTing
School: East China Normal University
Course: Physical Geography
Keywords: Yangtze River estuary. Chase Flow Sediment transport rate Variation Wavelet Analysis Correlation Analysis
CLC: TV148.1
Type: Master's thesis
Year: 2006
Downloads: 377
Quote: 5
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Abstract


The Yangtze River basin of water and sediment conditions is an important condition for the evolution of development in river deltas and estuary area is a typical area of ??land-ocean interaction studies. Chase hydrological station is the main control station of the Yangtze River into the estuary area Based on this station monthly average flow measured 1946 to 2004 and from 1951 to 2004 the monthly average sediment transport rate data using wavelet analysis method, respectively Chase outbound traffic flood and sediment transport process DRY SEASON time series, and the average annual time series analysis, the results showed that: by wavelet analysis can reveal multi-time-scale structure of the Yangtze River into the estuary of flow and sediment transport rate changes and different time scales flow and sediment transport rate cycle changes in the strength and location of the distribution, and the mutation point distribution, and derived based on wavelet variance test cycle can predict the future flow changes. Odori Station flood season overall flow time series (1946 to 2004) showed a decreasing trend, Dry Weather Flow upward trend increase, and therefore the general trend of the average annual flow did not change significantly, a slight decrease, but in recent years rebound; runoff During Flood and Drought change, annual average flow of the flood season and the Dry Seasons ratio of about 2.44. From three time series of wavelet analysis and time-frequency distribution can draw the following conclusions: the flood season, and the average annual flow time series variation there is a great similarity, both changes in the primary cycle followed by 12 to 13a, 6a, 2a and 1a, and the smaller the time scale changes in the structure of the more complex, the better the phase variation consistency; Dry Weather Flow sequences exist 13a, 2a and 1a of the main cycle changes; 12 to 13a time scale, the average annual flow of the mutation position In 1960 and 1988, the flood season in 1961 and 1991, dry season in the 1957 and 1984 years ago, their entire time series is divided into three stages, the second stage between the two mutations, are all less water stage, the other two stages are relatively rich in water. During Flood and Drought and the average annual flow are periodic oscillations on a time scale of 12 ~ 13a strongest, has gone through a wet year in a row - dry years in a row - a change in the process of wet years in a row; 4 ~ 7a and 2a cycle oscillation characteristics around the time scale is also obvious. Chase outbound traffic change cycle and time-frequency distribution to predict the flow of the Yangtze River into the estuary little change in a short period of time, in the multi-year average to fluctuate; traffic will increase in 2010 after a period of time. Chase Station from 1951 to 2004 time series of sediment transport rate variation: tended to decrease as the overall sediment load in the past 54 years: a different periodic oscillation and mutation characteristics in different scales, the smaller the scale of the sequence of phase change The more complex and more point mutations; During Flood and Drought and the average annual sediment transport rate sequence change cycle followed by 16a, 2a and 1a, 16a time scale on most periodic oscillations; sediment discharge runoff exists more During Flood and Drought significant changes in the flood season sediment transport rate is much larger than the dry season, the two years of the average ratio of about 6.87; 16a time scales, Chase Station During Flood and Drought and annual average sediment transport process has undergone the consecutive years Foncha continuous small changes in sediment years, The flood season mutation point in 1982, dry season in 1978, the average annual in 1983, the sediment load before 1983, the amount of sediment in the 1983 drastically reduced. Changes in the sediment load is more significantly affected by human activities, a considerable period of time in the future will continue to decrease. Pearson correlation analysis found the Odori Station there is a good correlation time series of water and sediment, dry season

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CLC: > Industrial Technology > Hydraulic Engineering > The basic science of water resources project > Sediment dynamics, River Dynamics > Estuaries,harbors,coastal sediment > Estuarine sediment
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