无居民海岛前大连岛的原自然海岸特征

确定自然海岸特征是海岸修复中的重要内容,但是在开发后弃管的无居民海岛却面临缺少历史资料参考的困难。在大连普兰店湾中部前大连岛的研究证明,依据历史影像和现存海岸地质地貌情况可以分析确定原自然海岸位置及性质。1972年KH 卫星影像表明当时的前大连岛仍然保持自然海岸形态,海岸位置在2020年海岸后 方的岛屿陆域内部。结合2020年海岸地质考察结果可以进一步确定1972年的前大连岛东部、西部分布海蚀崖形式的基岩海岸,南部、北部则分布砾石质海岸。1972—2020年,前大连岛自然海岸全部变化为人工海岸,海岸长度也从约2.38 km 增加至约3.12 km。

Original Natural Coast Characteristics of the Uninhabited Qiandalian Island

It is an importantpart of coastal restoration to identify the characteristics of natural coast. However, it is difficult to know the natural coast characteristics of uninhabited islands discarded after their development due to the lack of historical references. The study on the Qiandalian Island located in the central part of the Pulandian Bay of Dalian City has demonstrated that the location and property of natural coast of the uninhabited islands can be analyzed and identified based on the historical remote sensing images and the geological and geomorphic status of the existing coast. From the KH satellite images obtained in 1972, it can be recognized that the coast of the Qiandalian Island remained its natural shape at that time. However, its position is now within the island land behind the coast of 2020. Combined with the coastal geological survey carried out in 2020, it can be further identified that at the time of 1972 bedrock coast in the form of sea cliffs was distributed in the eastern and western parts of the Qiandalian Island and a gravel coast in the southern and northern parts. From 1972 to 2020, all the natural coast of the Qiandalian Island changed into artificial one and also the length of the coast increased from 2.38 km to 3.12 km.