龚政, 石磊, 靳闯, 张茜, 赵堃. 江苏中部潮滩长期演变规律及其受米草生长影响[J]. 水科学进展, 2021, 32(4): 618-626. DOI: 10.14042/j.cnki.32.1309.2021.04.013
引用本文: 龚政, 石磊, 靳闯, 张茜, 赵堃. 江苏中部潮滩长期演变规律及其受米草生长影响[J]. 水科学进展, 2021, 32(4): 618-626. DOI: 10.14042/j.cnki.32.1309.2021.04.013
GONG Zheng, SHI Lei, JIN Chuang, ZHANG Qian, ZHAO Kun. Long term evolution of tidal flat at the center of Jiangsu Provinceand the influence of Spartina alterniflora growth[J]. Advances in Water Science, 2021, 32(4): 618-626. DOI: 10.14042/j.cnki.32.1309.2021.04.013
Citation: GONG Zheng, SHI Lei, JIN Chuang, ZHANG Qian, ZHAO Kun. Long term evolution of tidal flat at the center of Jiangsu Provinceand the influence of Spartina alterniflora growth[J]. Advances in Water Science, 2021, 32(4): 618-626. DOI: 10.14042/j.cnki.32.1309.2021.04.013

江苏中部潮滩长期演变规律及其受米草生长影响

Long term evolution of tidal flat at the center of Jiangsu Provinceand the influence of Spartina alterniflora growth

  • 摘要: 在江苏盐城川东港南侧潮滩设置了一系列水准桩,使用滩面高程观测仪对滩面高程进行7 a(2012年10月—2018年11月)的逐月现场观测,结合遥感资料获取米草前缘位置变化,探究淤泥质潮滩中长期演变规律及米草生长在潮滩地貌演变中的作用。结果表明:高滩区域地下过程(土体膨胀、压缩等)对滩面变化起控制作用;盐沼区米草生长促进滩面沉积,随米草前缘向海生长,盐沼中部区域年增长率降低,靠近米草前缘区域滩面年淤积量增加,但米草向海推进对光滩区域演变影响小;潮滩剖面自陆向海依次可分为基本稳定带、快速淤积带、基本稳定带、快速冲刷带,潮间带中部坡度逐步增大;滩涂面积保有量在2012—2018年观测时段内逐年降低。

     

    Abstract: A series of benchmarks were setup on the south Chuandong tidal flat (Yancheng, Jiangsu). Monthly observation of the surface elevation has been performed for 7 years (October 2012 to November 2018) using the Rod Surface Elevation Table(RSET). The edge of the Spartina alterniflora was obtained from the remote sensing images. The long-term evolution of the mudflat and the influence of growth of Spartina alterniflora were evaluated. Results show that: the subsurface processes (e.g., soil expansion and compression) is the key factor affecting the evolution of mudflat at the highest position of the tidal flat. The growth of salt marsh increases the amount of sediment deposition. With the propagation of the edge of salt marsh, the annual sediment deposition at the central salt marsh decreases gradually. In the vicinity of the frontier of the salt marsh, the annual siltation volume increases. Even though, the bare flat evolution trend is hardly affected by the advancing of salt marsh. From the landside to seaside, the cross-shore profile can be divided into 4 zones, which are erosion-deposition balance, rapid deposition, erosion-deposition balance and rapid erosion zones, respectively. The slope of the intertidal flat increases evidently. The tidal flat resources decrease constantly in the past 7 years.

     

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