| 摘要: |
| 基于象山港海域1935年、1962年和2005年3个年份的海图资料，应用GIS技术，计算分析了不同时段象山港的岸线变化、海床平面冲淤变化和滩槽平面变化，结合实测水文泥沙资料，探讨了该区域的冲淤变化趋势。分析结果表明，在1935—2005年间，象山港岸线总体上保持稳定，仅在部分凹湾岸段和岛屿周围由于围海筑堤而向海推进，速率约13.8 m/a，受此影响，潮滩细颗粒泥沙的沉积空间趋于减小，潮滩发育尚不完全；海床平面则经历了由冲转淤的调整过程，并呈现出湾顶附近轻微冲刷、口门附近轻微淤积、口门东侧缓慢淤积的冲淤分布特征。总体而言，象山港岸滩表现为轻微淤积，年均淤积速率0.54 cm/a，可以认为这主要是受人类活动影响所致。 |
| 关键词: 象山港 岸滩演变 冲淤变化 滩槽 |
| DOI： |
| 分类号:TV148 |
| 基金项目:舟山市科技计划项目（2013C31045）；国家海洋局第二海洋研究所基本科研业务费专项（JT1203） |
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| Coastal evolution and scouring-silting variation in seabed of Xiangshan bay |
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CHEN Zun-geng1, DONG Wen-qiang1, NI Yun-lin1, YANG Hui2
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1.Maritime and Civil Engineering School, Zhejiang Ocean University， Zhoushan;2.Key Lab of Engineering Oceanography, The Second Institute of Oceanography, Hangzhou
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| Abstract: |
| Based on three topographical maps of 1935, 1962 and 2005, GIS technology is applied to calculate and analyze coastal evolution, scouring-silting variation and changes of the tidal flat and deep trough of the Xiangshan bay. With hydrological and sediment data of field observation, analysis of the trend of scouring-silting in the study region is carried out in this study. It is of important academic value and realistic value to fully understand scouring and silting characteristics. The analysis results indicate that from 1935 to 2005, the coastline kept stable generally except in some bays and around islands due to reclamation, with its advancing speed 13.8 m/a. As a result, the tidal flat is not completely silting, and the space for deposition of fine sediment tends to decrease. The seabed experiences an adjustment from erosion to deposition, presenting a distribution characteristic of slight scouring near the top of the bay, slight silting near the mouth of the bay and slow silting in the east of the mouth of the bay. Overall, the evolution of the Xiangshan bay is characterized by a slight deposition, and there was an annual average deposition rate of 0.54 cm/a, which can be considered that this is mainly affected by the human activities. |
| Key words: Xiangshan bay coastal evolution scouring silting variation tidal flat and deep trough |
