| 摘要: |
| 红树林岸外光滩高程变化是红树林可持续性发展的重要环境因素。本文以南海西北部英罗湾为研究区，利用多时相多源遥感影像提取水边线，并结合迭代的FVCOM水动力模型模拟方法，建立了2008年和2015年两个时期红树林岸外光滩数字高程模型（Digital Elevation Model，DEM）。利用两个时期的反演结果进行空间叠置分析，结果表明：2008年至2015年，湾顶光滩大部分呈现稳定-淤积状态；位于海湾中部至口门的光滩，从上部到下部整体呈现从淤积-稳定-侵蚀的趋势，其中光滩中部局部出现沟壑状侵蚀，与大型潮沟的发育和摆动有关；而光滩上部冲淤的空间差异性，主要由于红树林林区扩张形态以及人类活动的干预。 |
| 关键词: 光滩 遥感 水动力模型 冲淤 红树林 |
| DOI：10.11759/hykx20181115001 |
| 分类号:P217 |
| 基金项目:广东高校优秀青年创新人才培养计划项目（2014KQNCX 084）；国家自然科学基金重点项目（41530962） |
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| Erosion-accretion analysis of bare flats outside the mangrove area in Yingluo Bay, southwestern South China Sea |
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QI Ya-li1,2, FU Dong-yang1, LIU Da-zhao1, LIU Bei1
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1.College of Electronics and Information Engineering, Guangdong Ocean University, Zhanjiang 524088;2.School of Geography and Ocean Science, Nanjing University, Nanjing 210023
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| Abstract: |
| The change of erosion and deposition of bare flats outside a mangrove area is very important to the living environment of the mangrove. In this paper, the Yingluo Bay area, Southwest China, is taken as a case study. Digital elevation models (DEMs) of the bare flats in 2008 and 2015 were built using the waterlines extracted from remote sensing images. The waterlines were assigned heights using elevations predicted by the hydrodynamic finite-volume coastal ocean model (FVCOM) via an iterative process. The analysis of erosion and accretion changes between 2008 and 2015 show that the bare flat near the bayhead was in a state of deposition and that the bare flat from the entrance to the middle area had the trend of accretion-stability-erosion from the upper to the lower bare flat. The spatial difference of erosion-accretion distribution in the upper flat is not only related to the expansion of the mangrove area to the sea but also to human activities. |
| Key words: bare flat remote sensing hydrodynamic model erosion and accretion evolution mangrove |
