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Title: River channel change in the Middle Yangtze River in the last 50 years: A case study in the Jianli sub-reach
Authors: LI LUQIAN
Keywords: river channel change; DEM; the middle Yangtze River; flood; human impact; levee construction
Issue Date: 3-Oct-2005
Citation: LI LUQIAN (2005-10-03). River channel change in the Middle Yangtze River in the last 50 years: A case study in the Jianli sub-reach. ScholarBank@NUS Repository.
Abstract: This study selects the Jianli sub-reach as an example to examine the impact of flood events and human activities in the last 50 years. To set up a continuous dataset, hydrologic survey data (1953-1987), channel distribution map (1:100,000; 1951, 1965 and 1975) and navigation charts (1:25,000; 1981 and 1997) were employed to reconstruct historical river channel. Cross-sections derived from hydrologic survey data indicates undercutting in riverbed. The results show that the river channel, under the constraint of levees, experienced a minor widening and severe bank failure, which benefited bar growth in the channel. Cross-sections changes and erosion/deposition analysis based on DEMs (Digital Elevation Model) derived from navigation charts present a pattern of a??overbank sedimentation, in-channel erosiona??. This study suggests increased water discharge and intense overbank flow due to Dongting shrinkage initiated scouring in the river valley. Levee construction has enhanced the erosion/deposition pattern through increasing flood stage and duration.
Appears in Collections:Master's Theses (Open)

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