| 摘要: |
| 采用数字岸线分析系统(DSAS)和岸线分形分析(FA), 以不同年份测量的9 期历史地图为数据源, 对1959—2002 年黄河三角洲海岸线长度、形态及变化过程进行了定量分析。结果表明, 从1959—1984 年黄河三角洲海岸线长度减小, 岸线平面轮廓形态变得平滑、简单; 从1984—2002 年三角洲海岸线长度增加, 岸线平面轮廓形态变得曲折、复杂。与此同时, 整个三角洲海岸中前进、后退及进退平衡岸线的比例构成变化也具有显著的阶段性。从总体上看, 前进岸线所占比例变化呈不断减小趋势, 但1980—1984 年、1996—2000 年曾有两次短暂的突然增大。从岸线变化速率及其空间分布看, 三角洲海岸线进退变化于1968—1974 年、1992—1996 年两度达到或接近平衡状态。根据初步分析, 1959—2002 年黄河三角洲岸线演变是在黄河入海泥沙总体减少的背景下发生的, 受到河口地貌变迁、海岸沉积动力系统的深刻影响。 |
| 关键词: 黄河三角洲 数字岸线分析 分形分析 海岸线 海岸地貌 |
| DOI：10.11693/hyhz20141200343 |
| 分类号: |
| 基金项目:国家自然科学基金项目, 41271016 号, 41471005 号; 山东省高等学校科技计划项目, J14LH02 号; 烟台市科技攻关计划项目,2014ZH075 号。 |
附件 |
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| QUANTITATIVE ANALYSIS OF COASTLINE CHANGE IN THE YELLOW RIVER DELTA FROM 1959 TO 2002 |
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LIU Peng, WANG Qing, ZHAN Chao, WANG Xin, DU Guo-Yun, LI Xue-Yan
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Coast Institute, Ludong University, Yantai 264025, China
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| Abstract: |
| Based on Digital Shoreline Analysis System (DSAS) and fractal analysis (FA), the coastline length, shape, and changing process of the Yellow River delta has been analyzed quantitatively from 1959 to 2002, nine historical maps were used as data source. The results show that the coastline length decreased from 1959 to 1984, but increased from 1984 to 2002. The shape of the coastline was smooth and simple from 1959 to 1984, but complex and curved from 1984 to 2002. The forward, backward, and balanced coastline changes featured clear stages. Generally, the coastline forwarding reduced gradually, during which two sudden increase events interrupted during 1980—1984 and 1996—2000. In frequency and spatial distribution, the coastline stayed stationary or balanced during 1968—1974 and 1992—1996. Our preliminary study shows that the coastline change in 1959—2002 was largely due to the overall reduction of river-borne sediments into the sea, and affected obviously by the specifications of local geomorphology and coastal current dynamics. |
| Key words: Yellow River delta digital shoreline analysis system fractal analysis coastline coastal geomorphology |
