COASTAL EVOLUTION NEAR THE YELLOW RIVER MOUTH AND STABILITY ANALYSIS OF THE NEARBY ARTIFICIAL ISLAND
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摘要: 利用Landsat TM卫星遥感图像对现黄河口区河道、岸线进行识别和提取,分别研究了1996-2011年间河口区河道、岸线演变特征及近岸淤蚀状况,结合历史实测资料,从整个新老黄河口区动态演化角度,分析了黄河口侧湾大型人工岛工程的稳定性。结果表明:清8以下河道小范围改道2次,可分3个阶段,新河口区岸线整体呈淤进状态,老河口区岸线持续呈蚀退状态,河口侧湾人工岛工程受南冲与北淤双重作用影响,新老河口沙嘴的变化及地层不均匀沉降对该人工岛的长期安全稳定产生了一定威胁。建议在大型人工岛工程两侧修建堤坝等防护工程,并加强河口整个区域地层沉降方面的长期监测工作。Abstract: River channels and coastlines near the modern Yellow River mouth were identified using Landsat TM satellite remote sensing images, and the evolvement feature of the river channel, coastline and nearshore erosion/deposition pattern were studied. The stability of the large-scale artificial island in Yellow River mouth was studied from the viewpoint of dynamic evolution of the entirely new and old mouth region based on historical measured data. It is found that the downstream channel after the Qing 8 diverged twice and could be divided into three stages. The coast is entirely depositional in the new mouth, but erosional in the old mouth; the area surrounding the artificial island is effected by such seabed evolutionary pattern, i.e. erosion in south and deposition in north; the evolvement of the new and old mouth spits and uneven subsidence of the local strata threatens the stability of the artificial island. It is proposed in this paper to build protection constructions on both sides of the artificial island, and to strengthen the monitoring of the subsidence of the whole delta region.
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