近60年莱州湾东部砂质海岸地貌的时空动态
发布时间：2019-05-09 13:52
【摘要】：在野外考察的基础上,以不同时期测量和成像的海图、地形图和高分辨率遥感影像为数据源,综合使用数字岸线分析、遥感、地理信息系统等方法,对近60年来莱州湾东部砂质海岸(界河口-刁龙嘴)地貌演变进行研究。结果表明,研究期内莱州湾东部岸线迁移和水下岸坡冲淤存在强烈的时空差异。岸线迁移表现为冲淤进退交替发生,其在时间过程上具有非线性的显著特点。1959-2013年,侵蚀岸线所占比例波动起伏,具有阶段性。侵蚀岸段年均演变速率以1985年为界分成两个阶段,前期由极大值4.95m/a(1959-1969年)锐减至极小值1.97m/a(1969-1985年),后期由1.97m/a增大到4.43m/a(1985-1998年),之后均处于高强度侵蚀。岸线迁移空间分布的差异性主要表现在4个岬湾的岸线变迁特征与莱州湾东岸岸线整体变迁并不一致。同时,水下岸坡冲淤条带大体相间分布,同一岸段1959-1985年和1985-2008年的冲淤演变趋势基本相反。进一步分析表明最近60年来,莱州湾东部砂岸在水库拦沙、潮上带工厂化水产养殖、大型海岸工程等人类活动的地貌效应共同控制下,发生了5次岸线淤积前进与侵蚀后退以及冲淤速率大小的交替。
[Abstract]:On the basis of field investigation, the methods of digital shoreline analysis, remote sensing, geographic information system and so on are used, which are based on sea charts, topographic maps and high-resolution remote sensing images of different periods. The geomorphologic evolution of sandy coast (boundary estuary-Diao Longzui) in the eastern Laizhou Bay in recent 60 years was studied. The results show that there is a strong spatio-temporal difference in the coastal migration of the eastern Laizhou Bay and the scouring and silting of the underwater shoreline during the study period. Shoreline migration takes place alternately in erosion and deposition, and it has the characteristic of nonlinear in time course. From 1959 to 2013, the proportion of eroded shoreline fluctuated and fluctuated in stages. The average annual evolution rate of the eroded coastal segment is divided into two stages in 1985, and the maximum 4.95m/a (1959-1969) decreases sharply to the minimum 1.97m/a (19691985) in the early stage. At the later stage, 1.97m/a increased to 4.43m/a (1985-1998), followed by high intensity erosion. The difference of the spatial distribution of shoreline migration is mainly manifested in the fact that the characteristics of shoreline vicissitude of the four headlands are not consistent with the overall change of the eastern coast of Laizhou Bay. At the same time, there is an interphase distribution of the scouring and silting strip on the underwater bank slope, and the evolution trend of scouring and silting in the same bank segment from 1959 to 1985 and 1985 to 2008 is basically opposite. Further analysis shows that in the past 60 years, the geomorphologic effects of human activities, such as reservoir sediment retention, industrial aquaculture in the upper tidal zone and large coastal engineering, have been jointly controlled by the sandy banks of the eastern Laizhou Bay. There are 5 times of shoreline deposition advance and erosion retreat as well as the alternation of erosion and deposition rate.
【作者单位】： 中国科学院烟台海岸带研究所;鲁东大学滨海生态研究院;中国科学院大学;
【基金】：国家重点研发计划重点专项项目(2017YFC0505902) “山东省高等学校优势学科人才团队培育计划”项目“蓝黄两区滨海资源与环境团队” 国家自然基金项目(41471005)
【分类号】：P737.1
[Abstract]:On the basis of field investigation, the methods of digital shoreline analysis, remote sensing, geographic information system and so on are used, which are based on sea charts, topographic maps and high-resolution remote sensing images of different periods. The geomorphologic evolution of sandy coast (boundary estuary-Diao Longzui) in the eastern Laizhou Bay in recent 60 years was studied. The results show that there is a strong spatio-temporal difference in the coastal migration of the eastern Laizhou Bay and the scouring and silting of the underwater shoreline during the study period. Shoreline migration takes place alternately in erosion and deposition, and it has the characteristic of nonlinear in time course. From 1959 to 2013, the proportion of eroded shoreline fluctuated and fluctuated in stages. The average annual evolution rate of the eroded coastal segment is divided into two stages in 1985, and the maximum 4.95m/a (1959-1969) decreases sharply to the minimum 1.97m/a (19691985) in the early stage. At the later stage, 1.97m/a increased to 4.43m/a (1985-1998), followed by high intensity erosion. The difference of the spatial distribution of shoreline migration is mainly manifested in the fact that the characteristics of shoreline vicissitude of the four headlands are not consistent with the overall change of the eastern coast of Laizhou Bay. At the same time, there is an interphase distribution of the scouring and silting strip on the underwater bank slope, and the evolution trend of scouring and silting in the same bank segment from 1959 to 1985 and 1985 to 2008 is basically opposite. Further analysis shows that in the past 60 years, the geomorphologic effects of human activities, such as reservoir sediment retention, industrial aquaculture in the upper tidal zone and large coastal engineering, have been jointly controlled by the sandy banks of the eastern Laizhou Bay. There are 5 times of shoreline deposition advance and erosion retreat as well as the alternation of erosion and deposition rate.
【作者单位】： 中国科学院烟台海岸带研究所;鲁东大学滨海生态研究院;中国科学院大学;
【基金】：国家重点研发计划重点专项项目(2017YFC0505902) “山东省高等学校优势学科人才团队培育计划”项目“蓝黄两区滨海资源与环境团队” 国家自然基金项目(41471005)
【分类号】：P737.1
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