| WANG Zhenyan,GAO Shu,HUANG Haijun. 2010. Spatial variations of tidal water level and their impact on the exposure patterns of tidal land on the central Jiangsu coast. Acta Oceanologica Sinica, (1):79－87 |
| Spatial variations of tidal water level and their impact on the exposure patterns of tidal land on the central Jiangsu coast |
| Spatial variations of tidal water level and their impact on the exposure patterns of tidal land on the central Jiangsu coast |
| Received:December 11, 2008 Revised:April 07, 2009 |
| DOI：10.1007/s13131-010-0010-6 |
| Key words:waterline water level variations exposure patterns central Jiangsu coast remote sensing |
| 中文关键词: waterline water level variations exposure patterns central Jiangsu coast remote sensing |
| 基金项目:The Ministry of Science and Technology of China under contract No. 2006CB708410; the National Natural Science Foundation of China (NSFC) under contract No. 40706027. |
| Author Name | Affiliation | E-mail | | WANG Zhenyan | Key Laboratory of Marine Geology and Environment, Chinese Academy of Sciences, Qingdao 266071, China
Graduate School, Chinese Academy of Sciences, Beijing 100039, China | zywang@ms.qdio.ac.cn | | GAO Shu | MOE Key Laboratory for Coast and Island Development, Nanjing University, Nanjing 210093, China | | | HUANG Haijun | Key Laboratory of Marine Geology and Environment, Chinese Academy of Sciences, Qingdao 266071, China | |
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| Abstract: |
| The exposed area of intertidal zone varies with tidal water level changes. If intercomparisons of satellite images are adopted as a method to determine geomorphological changes of the intertidal zone in response to accretion or erosion processes, then the effect of water level variations must be evaluated. In this study, two Landsat TM images overpassing the central Jiangsu coastal waters on 2 January and 7 March 2002, respectively, were treated by the changing detection analysis using Image Differencing and Post-classification Comparison. The simultaneous tide level data from four tide gauge stations along the coast were used for displaying the spatial variations of water levels and determining the elevations of waterlines. The results show that the spatial variations of water levels are highly significant in the central Jiangsu coastal waters. The huge differences of tidal land exposure patterns between the two imaging times are related mainly to the spatial variations of tidal water levels, which are controlled by the differences in tidal phases for different imaging times and the spatial variations of water level over the study area at each imaging time. Under complex tidal conditions, e.g., those of the central Jiangsu coastal waters, the tide-surge model should be used to eliminate effectively the effects of water level variations on remote sensing interpretation of geomorphological changes in the intertidal zone. |
| 中文摘要: |
| The exposed area of intertidal zone varies with tidal water level changes. If intercomparisons of satellite images are adopted as a method to determine geomorphological changes of the intertidal zone in response to accretion or erosion processes, then the effect of water level variations must be evaluated. In this study, two Landsat TM images overpassing the central Jiangsu coastal waters on 2 January and 7 March 2002, respectively, were treated by the changing detection analysis using Image Differencing and Post-classification Comparison. The simultaneous tide level data from four tide gauge stations along the coast were used for displaying the spatial variations of water levels and determining the elevations of waterlines. The results show that the spatial variations of water levels are highly significant in the central Jiangsu coastal waters. The huge differences of tidal land exposure patterns between the two imaging times are related mainly to the spatial variations of tidal water levels, which are controlled by the differences in tidal phases for different imaging times and the spatial variations of water level over the study area at each imaging time. Under complex tidal conditions, e.g., those of the central Jiangsu coastal waters, the tide-surge model should be used to eliminate effectively the effects of water level variations on remote sensing interpretation of geomorphological changes in the intertidal zone. |
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