Evolution of the Jiuduansha wetland and the impact of navigation works in the Yangtze Estuary, China
Evolution of the Jiuduansha wetland and the impact of navigation works in the Yangtze Estuary, China
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中国长江口九段沙湿地的演变及通航工程的影响
DOI：
10.1016/j.geomorph.2015.10.031
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发表时间：
2016-01
期刊：
影响因子：
3.9
通讯作者：
Tian Bo
中科院分区：
文献类型：
--
作者：
Li Xing;Liu J Paul;Tian Bo
随着大型工程建设和土地需求的增加，长江口河口湿地面临着日益严重的威胁。九段沙湿地是长江口四个主要岛屿之一，是国家级湿地自然保护区，也是东亚-澳大拉西亚候鸟迁徙的重要中转地，具有重要的国家和国际意义。自1998年以来，邻近的深水航道项目（DNC）大大改变了以前未受干扰的湿地。为了了解DNC在九段沙湿地演变中的作用，从沉积速率、面积变化、演变轨迹、几何特征和地貌变化等多个角度进行了诊断研究。结合GIS、地统计学和遥感技术，本研究从空间上揭示了DNC对九段沙湿地的影响。利用DNC建成前后的多时相地形图和陆地卫星影像资料进行研究。结果表明，近30年来，该湿地大部分区域发生了淤积，占总面积的67.3%。然而，超过40%的研究区域显示沉积速率呈下降趋势。沉积-侵蚀模式的空间分布与DNC密切相关。DNC对九段沙湿地的演化也有重要影响。九段沙（JDS）、江垭（JYS）、上沙（US）和中下滩（MLS）的0、2和5 m等深线对DNC的响应不同。具体而言，DNC南导堤对与其相交的2 m等深线以上的JDS具有“吸附效应”，导致JDS的演变轨迹、几何形态特征在短期内发生明显改变。综合分析认为，未来，JDS将沿南导堤向上下游方向沿着，JDS南侧将被侵蚀。
The estuarine wetlands in the Yangtze Estuary face increasing threats due to large-scale engineering projects and huge land requirements. As a Wetland National Nature Reserve and important stopover site for migratory shorebirds of the East Asian–Australasian Flyway, the Jiuduansha wetland, one of four main islands in the estuary, is of both national and international importance. Since 1998 the previously undisturbed wetland has been considerably modified by the adjacent Deep-water Navigation Channel project (DNC). In order to understand the role of the DNC for the evolution of the Jiuduansha wetland, we performed a diagnostic study from multiple perspectives, including deposition rate, area change, evolution track, geometric characteristics, and geomorphological change. By coupling GIS, geostatistics, and remote sensing techniques, this study demonstrates the impact of the DNC on the Jiuduansha wetland in a spatially explicit way. Multi-temporal bathymetric maps and Landsat images from before and after the DNC was constructed were adopted to conduct our study. We find that deposition has occurred in most parts of the wetland over the past almost 30 years, accounting for 67.3% of the total area. However, over 40% of the study area shows a decreasing trend in deposition rate. The spatial distribution of deposition–erosion patterns is closely linked to the DNC. We also find that the DNC has substantial effects on the evolution of the Jiuduansha wetland. The 0, 2, and 5 m isobaths in the Jiuduansha Shoal (JDS), as well as in the Jiangya Shoal (JYS), the Upper Shoal (US) and the Middle-Lower Shoal (MLS), show different response patterns to the DNC. Specifically, the south training jetty of the DNC has an “adsorption effect” on the JDS above the 2 m isobaths intersecting with it. As a result, the evolution track, geometric and geomorphological characteristics of the JDS were markedly altered in the short term. Our comprehensive analysis suggests that in the future, the JDS will become more elongated in both the upstream and downstream direction along the south training jetty, and that the south side of the JDS will be eroded.
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DOI：
--
发表时间：
2011
期刊：
Resources and Environment in the Yangtze Basin
影响因子：
--
作者：
Xu Chang-le
通讯作者：
Xu Chang-le
长江口滨海湿地对海平面上升的脆弱性评估
DOI：
10.1016/j.ecss.2014.06.015
发表时间：
2015-04
期刊：
Estuarine, Coastal and Shelf Science
影响因子：
--
作者：
Cui Li-Fang;Ge Zhen-Ming;Yuan Lin;Zhang Li-Quan
通讯作者：
Zhang Li-Quan
影响因子：
2.8
作者：
Lei Zhang;Bingfang Wu;K. Yin;Xiaosong Li;Kun Jia;Liang Zhu
通讯作者：
Lei Zhang;Bingfang Wu;K. Yin;Xiaosong Li;Kun Jia;Liang Zhu
DOI：
--
发表时间：
2010
期刊：
Journal of Yangtze River Scientific Research Institute
影响因子：
--
作者：
Chen Hai-feng
通讯作者：
Chen Hai-feng
影响因子：
3.9
作者：
Z. Dai;James T. Liu;Gui Fu;Hua-liang Xie
通讯作者：
Z. Dai;James T. Liu;Gui Fu;Hua-liang Xie