Hydrological controls on the evolution of the Yellow River Delta: An evaluation of the relationship since the Xiaolangdi Reservoir became fully operational
Hydrological controls on the evolution of the Yellow River Delta: An evaluation of the relationship since the Xiaolangdi Reservoir became fully operational
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DOI：
10.1002/hyp.13274
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发表时间：
2018-10
影响因子：
3.2
通讯作者：
Yuanyuan Zhou;H. Huang;L. Ran;Changxing Shi;Teng Su
中科院分区：
文献类型：
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作者：
Yuanyuan Zhou;H. Huang;L. Ran;Changxing Shi;Teng Su
在黄河干流上修建的小浪底水库，自2002年底全面运用以来，在很大程度上控制了黄河入海口的径流过程。为探讨这一新的水文过程与黄河河口演变的关系，利用遥感卫星影像对黄河河口的地貌动力调整进行了详细的研究。结果表明，河口河道在2002-2004年间迅速扩张，但在1999-2001年间呈收缩趋势，之后扩张缓慢，在河水与海水交汇处有较大的漂移。2007年底，河口航道北岸发生了一次撕裂，那里远离河水与海水的交汇处。在2008-2012年间，新的河口航道以缓慢的速度延伸到海中，而自2013年底以来，它分成两个分支，交替向海中排放主要水流。虽然新的水文过程中的水沙输入都比以前少了很多，但地貌调整仍然表现出两者的过量输入。此外，剥离后，河口土地淤积的季节格局也呈现出明显的特点，侵蚀主要发生在雨季，淤积主要发生在枯季。
The Xiaolangdi Reservoir, which was constructed in the trunk of the Yellow River, has controlled the flow process into the mouth of the Yellow River to a significant degree since it began fully operating in late 2002. To evaluate the relationship between the new hydrological process and the evolution of the Yellow River estuary, this study presents a detailed investigation of the morphodynamic adjustment in the river mouth using remote sensing satellite images. It was shown that the mouth channel rapidly extended in length from 2002 to 2004, although it was shrinking during 1999–2001, and then it expanded very slowly with considerable shifts at the place where the river flow mixes with seawater. In late 2007, an avulsion occurred on the northern bank of the mouth channel, far upstream from where the river water mixes with seawater. During 2008–2012, the new mouth channel extended its length into the sea at a slow pace, whereas since late 2013, it has divided into two branches that alternately discharge the main flow into the sea. Although both the water and the sediment input in the new hydrological process are much smaller in quantity than before, the geomorphic adjustments still manifest an excessive input of both. Moreover, after the avulsion, the seasonal pattern of land accretion in the river mouth has been characterized, with erosion occurring mostly in the wet seasons and accretion mostly occurring in the dry seasons.