Impact of Mainstream Backwater on the Water Environment of the Tributaries of the Three Gorges Reservoir at Low Water Level

被引：2

作者：

Chen Z.-J. ^{[1
,2
]}

Song X.-F. ^{[1
,3
]}

Zhang Y.-H. ^{[1
]}

Wei X. ^{[1
,2
]}

Tang Y. ^{[1
,2
]}

Qin W.-J. ^{[1
,2
]}

机构：

[1] Key Laboratory of Water Cycle and the Surface Process, Institute of Geographical Science and Natural Resources, Chinese Academy of Sciences, Beijing

[2] Sino-Danish College, University of Chinese Academy of Sciences, Beijing

[3] School of Resources and Environment, University of Chinese Academy of Sciences, Beijing

来源：

Huanjing Kexue/Environmental Science | 2018年 / 39卷 / 11期

关键词：

Hydrogen and oxygen isotopic characteristics; Land use; Main tributaries; Mainstream backwater; Three Gorges Reservoir; Water chemical characteristics;

D O I：

10.13227/j.hjkx.201803061

中图分类号：

学科分类号：

摘要：

To prevent the eutrophication of tributaries and guarantee water quality and safety in the Three Gorges Reservoir, research on the impact of mainstream backwater on tributary water environments is of great significance. The investigation and sampling of the Yangtze mainstream and its major tributaries in the reservoir region were performed from August 7 to August 12, 2016, through which the overall hydrochemical environment of the Three Gorges Reservoir has been revealed, and the impact of mainstream backwater on the hydrochemical characteristics of main tributaries has been determined during the low water level operation period. The results showed the following: ① The electrical conductivity of the mainstream varied from 291 μS•cm -1 to 336 μS•cm -1 , whereas that of the mainstream backwater unaffected zone of the tributary varied from 183.7 μS•cm -1 to 518 μS•cm -1 . The electrical conductivity of the mainstream backwater affected zone of the tributary varied from 267 μS•cm -1 to 330 μS•cm -1 , which was close to the mainstream variation range. ② The variation range of the δD and δ 18 O values of the mainstream were -81.60‰-75.16‰ and -11.57‰-10.26‰, whereas that of the mainstream backwater unaffected zone of tributaries were -59.94‰-43.67‰ and -9.00‰-6.04‰; those of the mainstream backwater affected zone of tributary were -77.85‰-50.75‰ and -11.06‰-7.33‰, which showed the same pattern as those of electrical conductivity and mass concentration of main anions and cations. This means that the mainstream affected the waterbody composition of tributaries through backwater as well as the chemical characterization of tributary water. The extent of mainstream backwater influence on tributaries was negatively correlated to the distance between the tributary estuary and Three Gorges Dam as well as tributary discharge. The hydrochemical characteristics of the mainstream backwater unaffected zone of the tributary were related to the tributary catchment properties. Tributaries with denser populations and higher proportions of cultivated land have poorer water quality. Mainstream backwater can pollute tributaries of better water quality and optimize those with poor water quality. © 2018, Science Press. All right reserved.

引用

页码：4946 / 4955

页数：9

共 35 条

[1]

Hu N.S., Liu D.F., Ji D.B., Et al., Effect of backward flow from mainstream on nutrients distribution of tributaries in Three Gorges Reservoir, Environmental Science & Technology, 35, 10, pp. 6-11, (2012)

[2]

Liu B.Y., Simulation of hydrodynamics of Yulin River in the backwater area based on EFDC, (2015)

[3]

Zhao Y.Y., Zheng B.H., Wang L.J., Et al., Characterization of mixing processes in the confluence zone between the Three Gorges Reservoir mainstream and the Daning River using stable isotope analysis, Environmental Science & Technology, 50, 18, pp. 9907-9914, (2016)

[4]

Holbach A., Wang L.J., Chen H., Et al., Water mass interaction in the confluence zone of the Daning River and the Yangtze River-a driving force for algal growth in the Three Gorges Reservoir, Environmental Science and Pollution Research, 20, 10, pp. 7027-7037, (2013)

[5]

Zhang S., Li C.M., Zheng B.H., Et al., Trophic states and nutrient output of tributaries in Three Gorges Reservoir area, Environmental Science, 28, 3, pp. 500-505, (2007)

[6]

Zou J.X., Zhai H.J., Impacts of Three Gorges Project on water environment and aquatic ecosystem and protective measures, Water Resources Protection, 32, 5, pp. 136-140, (2016)

[7]

Xiong C.J., Liu D.F., Ji D.B., Et al., Influence of the 175 m trial impoundment of the Three Gorges Reservoir on water environment in the Xiangxi Bay, Resources and Environment in the Yangtze Basin, 22, 5, pp. 648-656, (2013)

[8]

Ye Z.Y., Wang Y.C., Hu M.M., Et al., Hydrogen and oxygen stable isotope tracing of eco-hydrological processes in water bodies mixing the mainstream and a tributary of the Three Gorges Reservoir, Chinese Journal of Ecology, 36, 8, pp. 2358-2366, (2017)

[9]

Xie T., Ji D.B., Liu D.F., Et al., Water temperature monitoring of the head of the Three Gorges Reservoir and preliminary analysis, Resources and Environment in the Yangtze Basin, 22, 9, pp. 1201-1206, (2013)

[10]

Holbach A., Bi Y., Yuan Y., Et al., Environmental water body characteristics in a major tributary backwater of the unique and strongly seasonal Three Gorges Reservoir, China, Environmental Science: Processes & Impacts, 17, 9, pp. 1641-1653, (2015)

← 1 2 3 4 →