Recent changes in the erosion-accretion patterns of the active Huanghe (Yellow River) delta lobe caused by human activities
Recent changes in the erosion-accretion patterns of the active Huanghe (Yellow River) delta lobe caused by human activities
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DOI：
10.1016/j.csr.2014.02.014
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发表时间：
2014-11-01
影响因子：
2.3
通讯作者：
Yang, Zuosheng
中科院分区：
文献类型：
--
作者：
Bi, Naishuang;Wang, Houjie;Yang, Zuosheng
为评价黄河三角洲活动叶瓣自1996年以来的冲淤变化规律，利用遥感影像提取的岸线、河口外水深资料以及河流入海泥沙资料，对黄河三角洲活动叶瓣的冲淤变化进行了分析。结果表明，自2002年以来，活动三角洲叶瓣的陆上和水下区域的侵蚀-加积模式发生了显著变化。2002年，活动黄河三角洲叶瓣和Q8亚三角洲叶瓣的陆上部分的范围由减少的趋势转变为增加的趋势。2002年以后，河口附近水下三角洲的坡度也明显增大，这与陆上侵蚀-加积模式的变化相对应。由于水沙调控方案（WSRS）的增加，沉积物粒径导致更多的泥沙沉积在近岸地区，这导致了大部分的变化，在侵蚀-增生模式的活动三角洲瓣。此外，2005年以后修建的两座丁坝将部分黄河泥沙截留在近岸地区，这可能是活动黄河三角洲叶瓣加积的部分原因。根据黄河三角洲活动叶瓣的陆上范围、输沙量和时间，建立了一个二元回归模型，计算了在强烈人类活动影响下维持活动叶瓣平衡的临界输沙量。这一数值约为5000万吨/年，约为先前估计值的三分之一，该估计值是基于WSRS和河口附近丁坝建设之前的数据。(C)2014爱思唯尔有限公司版权所有。
To evaluate changes in the erosion-accretion patterns of the active Huanghe (Yellow River) delta lobe since 1996, shorelines extracted from remote sensing images, bathymetric data off the river mouth together with river sediment discharge to the sea were analyzed. The results indicate that the erosion-accretion patterns in the subaerial and subaqueous areas of the active delta lobe have changed significantly since 2002. The extent of subaerial portions of the active Huanghe delta lobe and the Q8 subdelta lobe shifted from a decreasing trend to an increasing trend in 2002. The slope of the subaqueous delta off the river mouth also increased markedly after 2002, corresponding to the changes in the erosion-accretion patterns of the subaerial area. An increase in the sediment particle size due to the Water-Sediment Regulation Scheme (WSRS) resulted in more sediment being deposited in the nearshore area, which caused most of the changes in the erosion-accretion patterns of the active delta lobe. Moreover, two groins constructed after 2005 trapped a portion of the Huanghe sediment in the nearshore area, which may partially contribute to the accretion of the active Huanghe delta lobe. Based on the subaerial extent of the active Huanghe delta lobe, sediment discharge and time, a binary regression model was developed to calculate the critical sediment discharge for maintaining the equilibrium of the active delta lobe under the impact of intense human activity. This value is approximately 50 Mt/yr, approximately one third of the previous estimate that was based on the data before the WSRS and construction of the groins near the river mouth. (C) 2014 Elsevier Ltd. All rights reserved.