Evolution of floodplains and bars at the Jingjiang reach of Yangtze River, China in response to Three Gorges Reservoir impoundment
XUE Xinghua1,2(),CHANG Sheng1,2,SONG Eping1,2
1. College of Forestry and Horticulture, Hubei University for Nationalities, Enshi 445000, Hubei, China 2. Key Laboratory of Biological Resources Protection and Utilization of Hubei Province, Enshi 445000, Hubei, China
At present, there is a lack of sufficient understanding of the evolution of floodplains and bars (FB) at the Jingjiang reach of Yangtze River after Three Gorges Reservoir impoundment. The erosion/accretion pattern and morphological evolution of FB at the Jingjiang reach were studied using remote sensing images acquired in low water periods before and after Gorges Reservoir impoundment. The results showed that the total area of FB at the Jingjiang reach shrank continually after the reservoir impoundment. By 2015 an area of 4.56 km2 had been scoured away, and most of the scour occurred within the first 6 years after the impoundment at an erosion rate of 0.55 km2/a. There were evident differences in erosion/accretion pattern and in morphological evolution between the upper and lower sections of Jingjiang reach. The total area of FB at the upper Jingjiang has continually decreased due to scouring after the impoundment, and the scouring intensity was greater than that in the lower Jingjiang. In contrast, erosion of the lower Jingjiang took place in the early period after the impoundment (2002-2009), but accretion was observed in the later period (2009-2015). In erosion/accretion distribution, the floodplains of upper Jingjiang reach were continually scoured and shrunk while the bars at concave banks were scoured in the early period but were accreted slightly in the later period; the mid-channel bars of upper Jingjiang were accreted in the early period but were scoured in the later period. In contrast, erosion mainly occurred at the floodplains of lower Jingjiang, while the bars at its concave banks and mid-channel bars were accreted. The mid-channel bar evolution at the Jingjiang reach after the reservoir impoundment was classified into eight types according to their position movement and erosion/accretion dynamics. On morphological evolution, the protruding parts of floodplains and the bars at concave banks of the upper Jingjiang were visibly eroded, while the morphology changed little. At the lower Jingjiang, however, the floodplains evolution had a characteristic pattern that the upstream part was eroded back, with a shrinkage of the top, while the downstream part was accreted, resulting in the alteration of convex bank from a highly curved morphology to a flattening-curved morphology. This erosion-accretion process of floodplains at the upstream convex bank even extended to the adjacent downstream concave bank when there was no obvious straight section connecting the neighboring highly curved bends or when the upstream convex bank shared the same bank with the downstream concave bank. Extension of upstream floodplain accretion to the downstream concave bank was an important reason for the development of both the bars at concave banks and the mid-channel bars at the lower Jingjiang. Generally, the accretion at the concave bank did not span to the top of concave bank.
. 三峡水库蓄水后荆江洲滩变化特征[J]. 地理学报,
2018, 73(9): 1714-1727.
. Evolution of floodplains and bars at the Jingjiang reach of Yangtze River, China in response to Three Gorges Reservoir impoundment[J]. Acta Geographica Sinica,
2018, 73(9): 1714-1727.
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This paper utilizes the data of water and sediment and river topography after the impoundment of the Three Gorges reservoir to analyze the channel and sediment of Jingjiang river, channel scouring and siltation,width-to-depth ratio and change of riverbed profile. On this base, this thesis studies the impact of the change riverbed profile on the Jingjiang channel condition. The laws of morphology variation of different sections in Jingjiang river are proved to be different after TGR operation, yet common features among these laws are clearly represented by upstream water sediment variation-deduced point bar scouring, river-width expansion, and contraction decline,as well as the decrease of degree of curve under the same flow. Under the impact of release of water these changes will be sustainable development. The nearshore scouring and the width of river channel increase are still themain forms and features. Moreover, these changes may bring about some unfavorable effects on Jingjiang channel condition.
Based on the existed research results and field data, this paper analyzes the recent evolution regularity, navigation-obstruction characteristics, as well as main problems of the waterway, and then predicts the river evolution trend according to the model results. Firstly, the necessity of waterway regulation project is analyzed.According to the development demands of the reach, this paper discusses the necessity of waterway regulation in the reach, and then proposes the regulation ideas and tentative scheme under consideration of the navigation-obstruction characteristics and waterway regulation targets. The research results concerning the bed evolution, navigationobstruction characteristics and scheme comparison and selection may serve as reference for the follow-up systematic regulation engineering.
Xue XH, Yuan LY.Study on the fluvial landscape patterns of upper Jingjiang segment, Yangtze River, using multi-temporal remote-sensing imageries//2013 Fifth International Conference on Measuring Technology and Mechatronics Automation (ICMTMA), , 2013.
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